java中常用的工具类（三）

继续分享java中常用的一些工具类。前两篇的文章中有人评论使用Apache 的lang包和IO包，或者Google的Guava库。后续的我会加上的！谢谢支持IT江湖

一、连接数据库的综合类

 

 

 

 

 

Java

 

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package com.itjh.javaUtil;   import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.ResultSetMetaData; import java.sql.SQLException; import java.util.ArrayList; import java.util.Collections; import java.util.HashMap; import java.util.List; import java.util.Map;   import org.apache.commons.dbcp.ConnectionFactory; import org.apache.commons.dbcp.DriverManagerConnectionFactory; import org.apache.commons.dbcp.PoolableConnectionFactory; import org.apache.commons.dbcp.PoolingDriver; import org.apache.commons.dbutils.DbUtils; import org.apache.commons.dbutils.QueryRunner; import org.apache.commons.dbutils.handlers.MapListHandler; import org.apache.commons.pool.ObjectPool; import org.apache.commons.pool.impl.GenericObjectPool;   /** * 连接数据库的综合类。</br> * 依赖jar包：commons.dbcp-1.4，commons.dbutils-1.3，commons.pool-1.5.4包。 * * @author 宋立君 * @date 2014年07月03日 */   public class DBUtil {       private String dri = null;     private String url = null;     private String username = null;     private String password = null;     private String poolName = null; // 连接池名称     private ObjectPool connectionPool = null; // 连接池     // 对应的定时查询类     private QueryThread queryThread = null;       /**      * 功能：构造函数      *      * @author 宋立君      * @date 2014年07月03日      * @param dri      *            驱动全类名，例如：com.mysql.jdbc.Driver。      * @param url      *            数据库url连接，例如：      *            "jdbc:mysql://127.0.0.1:3306/test?autoReconnect=true&amp;useUnicode=true&amp;characterEncoding=UTF-8"      * @param userName      *            数据库用户名，例如：root      * @param password      *            数据库密码，例如：abc      * @param poolName      *            创建的数据库连接池的名称，例如mypool，注意一个web容器此名称不能重复。      */     public DBUtil(String dri, String url, String userName, String password,             String poolName) {         this.dri = dri;         this.url = url;         this.username = userName;         this.password = password;         this.poolName = poolName;     }       /**      * 执行sql。      *      * @param conn      *            连接      * @param pstm      *            PreparedStatement      * @return int 执行sql对应的影响行。      * @throws SQLException      * @author 宋立君      * @date 2014年07月03日      */     public int execute(Connection conn, PreparedStatement pstm)             throws SQLException {         try {             return pstm.executeUpdate();         } finally {             Close(conn);         }     }       /**      * 查询sql。      *      * @param conn      *            连接      * @param pstm      *            PreparedStatement      * @return List<Map<String,Object>> 查询的结果集      * @throws SQLException      * @author 宋立君      * @date 2014年07月03日      */     public List<Map<String, Object>> query(Connection conn,             PreparedStatement pstm) throws SQLException {         try {             return resultSetToList(pstm.executeQuery());         } finally {             Close(conn);         }     }       /**      * 功能：ResultSet 转为List<Map<String,Object>>      *      *      * @param rs      *            ResultSet 原始数据集      * @return List<Map<String,Object>>      * @throws java.sql.SQLException      * @author 宋立君      * @date 2014年07月03日      */     private List<Map<String, Object>> resultSetToList(ResultSet rs)             throws java.sql.SQLException {         if (rs == null)             return Collections.EMPTY_LIST;           ResultSetMetaData md = rs.getMetaData(); // 得到结果集(rs)的结构信息，比如字段数、字段名等         int columnCount = md.getColumnCount(); // 返回此 ResultSet 对象中的列数         List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();         Map<String, Object> rowData = new HashMap<String, Object>();         while (rs.next()) {             rowData = new HashMap<String, Object>(columnCount);             for (int i = 1; i <= columnCount; i++) {                 rowData.put(md.getColumnName(i), rs.getObject(i));             }             list.add(rowData);         }         return list;     }       /**      * 查询sql语句。      *      * @param sql      *            被执行的sql语句      * @return List<Map<String,Object>>      * @throws SQLException      * @author 宋立君      * @date 2014年07月03日      */     public List<Map<String, Object>> query(String sql) throws SQLException {         List<Map<String, Object>> results = null;         Connection conn = null;         try {             conn = getConnection();             QueryRunner qr = new QueryRunner();             results = qr.query(conn, sql, new MapListHandler());         } finally {             Close(conn);         }         return results;     }       /**      * 根据参数查询sql语句      *      * @param sql      *            sql语句      * @param param      *            参数      * @return List<Map<String,Object>>      * @throws SQLException      * @author 宋立君      * @date 2014年07月03日      */     public List<Map<String, Object>> query(String sql, Object param)             throws SQLException {         List<Map<String, Object>> results = null;         Connection conn = null;         try {             conn = getConnection();             QueryRunner qr = new QueryRunner();             results = (List<Map<String, Object>>) qr.query(conn, sql, param,                     new MapListHandler());         } catch (SQLException e) {             e.printStackTrace();         } finally {             Close(conn);         }         return results;     }       /**      * 执行sql语句      *      * @param sql      *            被执行的sql语句      * @return 受影响的行      * @throws Exception      * @author 宋立君      * @date 2014年07月03日      */     public int execute(String sql) throws Exception {         Connection conn = getConnection();         int rows = 0;         try {             QueryRunner qr = new QueryRunner();             rows = qr.update(conn, sql);         } finally {             Close(conn);         }         return rows;     }       /**      * 执行含参数的sql语句      *      * @param sql      *            被执行的sql语句      * @param params      *            参数      * @return 返回受影响的行      * @throws Exception      * @author 宋立君      * @date 2014年07月03日      */     public int execute(String sql, Object[] params) throws Exception {         Connection conn = getConnection();         int rows = 0;         try {             QueryRunner qr = new QueryRunner();             rows = qr.update(conn, sql, params);         } finally {             Close(conn);         }         return rows;     }       /**      * 关闭连接      *      * @param conn      * @throws SQLException      * @author 宋立君      * @date 2014年07月03日      */     public void Close(Connection conn) throws SQLException {         if (conn != null) {             conn.close();         }         DbUtils.closeQuietly(conn);     }       /**      * 启动连接池      *      * @author 宋立君      * @date 2014年07月03日      */     private void StartPool() {         try {             Class.forName(dri);         } catch (ClassNotFoundException e1) {             e1.printStackTrace();         }         if (connectionPool != null) {             ShutdownPool();         }         try {             connectionPool = new GenericObjectPool(null);             ConnectionFactory connectionFactory = new DriverManagerConnectionFactory(                     url, username, password);             PoolableConnectionFactory poolableConnectionFactory = new PoolableConnectionFactory(                     connectionFactory, connectionPool, null, "SELECT 1", false,                     true);             Class.forName("org.apache.commons.dbcp.PoolingDriver");             PoolingDriver driver = (PoolingDriver) DriverManager                     .getDriver("jdbc:apache:commons:dbcp:");             driver.registerPool(poolName, poolableConnectionFactory.getPool());           } catch (Exception e) {             e.printStackTrace();         }         // 开启查询程序         queryThread = new QueryThread(this);         queryThread.start();     }       /**      * 关闭连接池      *      * @author 宋立君      * @date 2014年07月03日      */     private void ShutdownPool() {         try {             PoolingDriver driver = (PoolingDriver) DriverManager                     .getDriver("jdbc:apache:commons:dbcp:");             driver.closePool(poolName);             // 关闭定时查询             queryThread.setStartQuery(false);         } catch (SQLException e) {             e.printStackTrace();         }     }       /**      * 得到一个连接      *      * @return      * @author 宋立君      * @date 2014年07月03日      */     public synchronized Connection getConnection() {         Connection conn = null;         try {             if (connectionPool == null)                 StartPool();             conn = DriverManager.getConnection("jdbc:apache:commons:dbcp:"                     + poolName);         } catch (Exception e) {             e.printStackTrace();         }         return conn;     } }   /** * 当连接池启动后会自动定时查询数据库，防止数据库连接超时。 * * @author 宋立君 * @date 2014年07月03日 */ class QueryThread extends Thread {       private DBUtil dbUtil = null;     // 是否开启查询     private boolean startQuery = true;       /**      * 功能：对应的数据库连接。      *      * @author 宋立君      * @date 2014年07月03日      * @param dbUtil      *            数据库连接      */     public QueryThread(DBUtil dbUtil) {         this.dbUtil = dbUtil;     }       public void run() {         while (true) {             try {                 if (startQuery) {                     this.dbUtil.query("select 1");                 }                 // System.out.println(startQuery+"   123");             } catch (Exception e) {                 e.printStackTrace();             } finally {                 try {                     Thread.sleep(120000);                 } catch (InterruptedException e) {                     e.printStackTrace();                 }             }         }     }       public void setStartQuery(boolean startQuery) {         // System.out.println("startQuery shut:"+startQuery);         this.startQuery = startQuery;     } }

依赖的jar

commons.dbcp-1.4，commons.dbutils-1.3，commons.pool-1.5.4包

二、DES加密和解密

DESUtil.java

 

 

 

 

 

Java

 

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package com.itjh.javaUtil;   import java.io.UnsupportedEncodingException; import java.security.InvalidKeyException; import java.security.NoSuchAlgorithmException; import java.security.SecureRandom; import java.security.spec.InvalidKeySpecException;   import javax.crypto.BadPaddingException; import javax.crypto.Cipher; import javax.crypto.IllegalBlockSizeException; import javax.crypto.KeyGenerator; import javax.crypto.NoSuchPaddingException; import javax.crypto.SecretKey; import javax.crypto.SecretKeyFactory; import javax.crypto.spec.DESKeySpec;   /** * DES加密和解密。 * * @author 宋立君 * @date 2014年07月03日 */ public class DESUtil {       /** 安全密钥 */     private String keyData = "ABCDEFGHIJKLMNOPQRSTWXYZabcdefghijklmnopqrstwxyz0123456789-_.";       /**      * 功能：构造      *      * @author 宋立君      * @date 2014年07月03日      */     public DESUtil() {     }       /**      * 功能：构造      *      * @author 宋立君      * @date 2014年07月03日      * @param keyData      *            key      */     public DESUtil(String key) {         this.keyData = key;     }       /**      * 功能：加密 (UTF-8)      *      * @author 宋立君      * @date 2014年07月03日      * @param source      *            源字符串      * @param charSet      *            编码      * @return String      * @throws UnsupportedEncodingException      *             编码异常      */     public String encrypt(String source) throws UnsupportedEncodingException {         return encrypt(source, "UTF-8");     }       /**      *      * 功能：解密 (UTF-8)      *      * @author 宋立君      * @date 2014年07月03日      * @param encryptedData      *            被加密后的字符串      * @return String      * @throws UnsupportedEncodingException      *             编码异常      */     public String decrypt(String encryptedData)             throws UnsupportedEncodingException {         return decrypt(encryptedData, "UTF-8");     }       /**      * 功能：加密      *      * @author 宋立君      * @date 2014年07月03日      * @param source      *            源字符串      * @param charSet      *            编码      * @return String      * @throws UnsupportedEncodingException      *             编码异常      */     public String encrypt(String source, String charSet)             throws UnsupportedEncodingException {         String encrypt = null;         byte[] ret = encrypt(source.getBytes(charSet));         encrypt = new String(Base64.encode(ret));         return encrypt;     }       /**      *      * 功能：解密      *      * @author 宋立君      * @date 2014年07月03日      * @param encryptedData      *            被加密后的字符串      * @param charSet      *            编码      * @return String      * @throws UnsupportedEncodingException      *             编码异常      */     public String decrypt(String encryptedData, String charSet)             throws UnsupportedEncodingException {         String descryptedData = null;         byte[] ret = descrypt(Base64.decode(encryptedData.toCharArray()));         descryptedData = new String(ret, charSet);         return descryptedData;     }       /**      * 加密数据 用生成的密钥加密原始数据      *      * @param primaryData      *            原始数据      * @return byte[]      * @author 宋立君      * @date 2014年07月03日      */     private byte[] encrypt(byte[] primaryData) {           /** 取得安全密钥 */         byte rawKeyData[] = getKey();           /** DES算法要求有一个可信任的随机数源 */         SecureRandom sr = new SecureRandom();           /** 使用原始密钥数据创建DESKeySpec对象 */         DESKeySpec dks = null;         try {             dks = new DESKeySpec(keyData.getBytes());         } catch (InvalidKeyException e) {             e.printStackTrace();         }           /** 创建一个密钥工厂 */         SecretKeyFactory keyFactory = null;         try {             keyFactory = SecretKeyFactory.getInstance("DES");         } catch (NoSuchAlgorithmException e) {             e.printStackTrace();         }           /** 用密钥工厂把DESKeySpec转换成一个SecretKey对象 */         SecretKey key = null;         try {             key = keyFactory.generateSecret(dks);         } catch (InvalidKeySpecException e) {             e.printStackTrace();         }           /** Cipher对象实际完成加密操作 */         Cipher cipher = null;         try {             cipher = Cipher.getInstance("DES");         } catch (NoSuchAlgorithmException e) {             e.printStackTrace();         } catch (NoSuchPaddingException e) {             e.printStackTrace();         }           /** 用密钥初始化Cipher对象 */         try {             cipher.init(Cipher.ENCRYPT_MODE, key, sr);         } catch (InvalidKeyException e) {             e.printStackTrace();         }           /** 正式执行加密操作 */         byte encryptedData[] = null;         try {             encryptedData = cipher.doFinal(primaryData);         } catch (IllegalStateException e) {             e.printStackTrace();         } catch (IllegalBlockSizeException e) {             e.printStackTrace();         } catch (BadPaddingException e) {             e.printStackTrace();         }           /** 返回加密数据 */         return encryptedData;     }       /**      * 用密钥解密数据      *      * @param encryptedData      *            加密后的数据      * @return byte[]      * @author 宋立君      * @date 2014年07月03日      */     private byte[] descrypt(byte[] encryptedData) {           /** DES算法要求有一个可信任的随机数源 */         SecureRandom sr = new SecureRandom();           /** 取得安全密钥 */         byte rawKeyData[] = getKey();           /** 使用原始密钥数据创建DESKeySpec对象 */         DESKeySpec dks = null;         try {             dks = new DESKeySpec(keyData.getBytes());         } catch (InvalidKeyException e) {             e.printStackTrace();         }           /** 创建一个密钥工厂 */         SecretKeyFactory keyFactory = null;         try {             keyFactory = SecretKeyFactory.getInstance("DES");         } catch (NoSuchAlgorithmException e) {             e.printStackTrace();         }           /** 用密钥工厂把DESKeySpec转换成一个SecretKey对象 */         SecretKey key = null;         try {             key = keyFactory.generateSecret(dks);         } catch (InvalidKeySpecException e) {             e.printStackTrace();         }           /** Cipher对象实际完成加密操作 */         Cipher cipher = null;         try {             cipher = Cipher.getInstance("DES");         } catch (NoSuchAlgorithmException e) {             e.printStackTrace();         } catch (NoSuchPaddingException e) {             e.printStackTrace();         }           /** 用密钥初始化Cipher对象 */         try {             cipher.init(Cipher.DECRYPT_MODE, key, sr);         } catch (InvalidKeyException e) {             e.printStackTrace();         }           /** 正式执行解密操作 */         byte decryptedData[] = null;         try {             decryptedData = cipher.doFinal(encryptedData);         } catch (IllegalStateException e) {             e.printStackTrace();         } catch (IllegalBlockSizeException e) {             e.printStackTrace();         } catch (BadPaddingException e) {             e.printStackTrace();         }           return decryptedData;     }       /**      * 取得安全密钥 此方法作废,因为每次key生成都不一样导致解密加密用的密钥都不一样， 从而导致Given final block not      * properly padded错误.      *      * @return byte数组      * @author 宋立君      * @date 2014年07月03日      */     private byte[] getKey() {           /** DES算法要求有一个可信任的随机数源 */         SecureRandom sr = new SecureRandom();           /** 为我们选择的DES算法生成一个密钥生成器对象 */         KeyGenerator kg = null;         try {             kg = KeyGenerator.getInstance("DES");         } catch (NoSuchAlgorithmException e) {             e.printStackTrace();         }         kg.init(sr);           /** 生成密钥工具类 */         SecretKey key = kg.generateKey();           /** 生成密钥byte数组 */         byte rawKeyData[] = key.getEncoded();           return rawKeyData;     }   }

Base64.java

 

 

 

 

 

Java

 

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package com.itjh.javaUtil;   import java.io.*;   /** * Base64 编码和解码。 * * @author 宋立君 * @date 2014年07月03日 */ public class Base64 {       public Base64() {     }       /**      * 功能：编码字符串      *      * @author 宋立君      * @date 2014年07月03日      * @param data      *            源字符串      * @return String      */     public static String encode(String data) {         return new String(encode(data.getBytes()));     }       /**      * 功能：解码字符串      *      * @author 宋立君      * @date 2014年07月03日      * @param data      *            源字符串      * @return String      */     public static String decode(String data) {         return new String(decode(data.toCharArray()));     }       /**      * 功能：编码byte[]      *      * @author 宋立君      * @date 2014年07月03日      * @param data      *            源      * @return char[]      */     public static char[] encode(byte[] data) {         char[] out = new char[((data.length + 2) / 3) * 4];         for (int i = 0, index = 0; i < data.length; i += 3, index += 4) {             boolean quad = false;             boolean trip = false;               int val = (0xFF & (int) data[i]);             val <<= 8;             if ((i + 1) < data.length) {                 val |= (0xFF & (int) data[i + 1]);                 trip = true;             }             val <<= 8;             if ((i + 2) < data.length) {                 val |= (0xFF & (int) data[i + 2]);                 quad = true;             }             out[index + 3] = alphabet[(quad ? (val & 0x3F) : 64)];             val >>= 6;             out[index + 2] = alphabet[(trip ? (val & 0x3F) : 64)];             val >>= 6;             out[index + 1] = alphabet[val & 0x3F];             val >>= 6;             out[index + 0] = alphabet[val & 0x3F];         }         return out;     }       /**      * 功能：解码      *      * @author 宋立君      * @date 2014年07月03日      * @param data      *            编码后的字符数组      * @return byte[]      */     public static byte[] decode(char[] data) {           int tempLen = data.length;         for (int ix = 0; ix < data.length; ix++) {             if ((data[ix] > 255) || codes[data[ix]] < 0) {                 --tempLen; // ignore non-valid chars and padding             }         }         // calculate required length:         // -- 3 bytes for every 4 valid base64 chars         // -- plus 2 bytes if there are 3 extra base64 chars,         // or plus 1 byte if there are 2 extra.           int len = (tempLen / 4) * 3;         if ((tempLen % 4) == 3) {             len += 2;         }         if ((tempLen % 4) == 2) {             len += 1;           }         byte[] out = new byte[len];           int shift = 0; // # of excess bits stored in accum         int accum = 0; // excess bits         int index = 0;           // we now go through the entire array (NOT using the 'tempLen' value)         for (int ix = 0; ix < data.length; ix++) {             int value = (data[ix] > 255) ? -1 : codes[data[ix]];               if (value >= 0) { // skip over non-code                 accum <<= 6; // bits shift up by 6 each time thru                 shift += 6; // loop, with new bits being put in                 accum |= value; // at the bottom.                 if (shift >= 8) { // whenever there are 8 or more shifted in,                     shift -= 8; // write them out (from the top, leaving any                     out[index++] = // excess at the bottom for next iteration.                     (byte) ((accum >> shift) & 0xff);                 }             }         }           // if there is STILL something wrong we just have to throw up now!         if (index != out.length) {             throw new Error("Miscalculated data length (wrote " + index                     + " instead of " + out.length + ")");         }           return out;     }       /**      * 功能：编码文件      *      * @author 宋立君      * @date 2014年07月03日      * @param file      *            源文件      */     public static void encode(File file) throws IOException {         if (!file.exists()) {             System.exit(0);         }           else {             byte[] decoded = readBytes(file);             char[] encoded = encode(decoded);             writeChars(file, encoded);         }         file = null;     }       /**      * 功能：解码文件。      *      * @author 宋立君      * @date 2014年07月03日      * @param file      *            源文件      * @throws IOException      */     public static void decode(File file) throws IOException {         if (!file.exists()) {             System.exit(0);         } else {             char[] encoded = readChars(file);             byte[] decoded = decode(encoded);             writeBytes(file, decoded);         }         file = null;     }       //     // code characters for values 0..63     //     private static char[] alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="             .toCharArray();       //     // lookup table for converting base64 characters to value in range 0..63     //     private static byte[] codes = new byte[256];     static {         for (int i = 0; i < 256; i++) {             codes[i] = -1;             // LoggerUtil.debug(i + "&" + codes[i] + " ");         }         for (int i = 'A'; i <= 'Z'; i++) {             codes[i] = (byte) (i - 'A');             // LoggerUtil.debug(i + "&" + codes[i] + " ");         }           for (int i = 'a'; i <= 'z'; i++) {             codes[i] = (byte) (26 + i - 'a');             // LoggerUtil.debug(i + "&" + codes[i] + " ");         }         for (int i = '0'; i <= '9'; i++) {             codes[i] = (byte) (52 + i - '0');             // LoggerUtil.debug(i + "&" + codes[i] + " ");         }         codes['+'] = 62;         codes['/'] = 63;     }       private static byte[] readBytes(File file) throws IOException {         ByteArrayOutputStream baos = new ByteArrayOutputStream();         byte[] b = null;         InputStream fis = null;         InputStream is = null;         try {             fis = new FileInputStream(file);             is = new BufferedInputStream(fis);             int count = 0;             byte[] buf = new byte[16384];             while ((count = is.read(buf)) != -1) {                 if (count > 0) {                     baos.write(buf, 0, count);                 }             }             b = baos.toByteArray();           } finally {             try {                 if (fis != null)                     fis.close();                 if (is != null)                     is.close();                 if (baos != null)                     baos.close();             } catch (Exception e) {                 System.out.println(e);             }         }           return b;     }       private static char[] readChars(File file) throws IOException {         CharArrayWriter caw = new CharArrayWriter();         Reader fr = null;         Reader in = null;         try {             fr = new FileReader(file);             in = new BufferedReader(fr);             int count = 0;             char[] buf = new char[16384];             while ((count = in.read(buf)) != -1) {                 if (count > 0) {                     caw.write(buf, 0, count);                 }             }           } finally {             try {                 if (caw != null)                     caw.close();                 if (in != null)                     in.close();                 if (fr != null)                     fr.close();             } catch (Exception e) {                 System.out.println(e);             }         }           return caw.toCharArray();     }       private static void writeBytes(File file, byte[] data) throws IOException {         OutputStream fos = null;         OutputStream os = null;         try {             fos = new FileOutputStream(file);             os = new BufferedOutputStream(fos);             os.write(data);           } finally {             try {                 if (os != null)                     os.close();                 if (fos != null)                     fos.close();             } catch (Exception e) {                 System.out.println(e);             }         }     }       private static void writeChars(File file, char[] data) throws IOException {         Writer fos = null;         Writer os = null;         try {             fos = new FileWriter(file);             os = new BufferedWriter(fos);             os.write(data);           } finally {             try {                 if (os != null)                     os.close();                 if (fos != null)                     fos.close();             } catch (Exception e) {                 e.printStackTrace();             }         }     }       // /////////////////////////////////////////////////     // end of test code.     // /////////////////////////////////////////////////   }

三、ExcelUtil工具类

 

 

 

 

 

Java

 

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package com.itjh.javaUtil;   import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.OutputStream; import java.text.DecimalFormat; import java.util.LinkedList; import java.util.List;   import javax.servlet.http.HttpServletResponse;   import org.apache.poi.hssf.usermodel.HSSFCell; import org.apache.poi.hssf.usermodel.HSSFRichTextString; import org.apache.poi.hssf.usermodel.HSSFRow; import org.apache.poi.hssf.usermodel.HSSFSheet; import org.apache.poi.hssf.usermodel.HSSFWorkbook; import org.apache.poi.openxml4j.exceptions.InvalidFormatException; import org.apache.poi.ss.usermodel.Cell; import org.apache.poi.ss.usermodel.DateUtil; import org.apache.poi.ss.usermodel.Row; import org.apache.poi.ss.usermodel.Sheet; import org.apache.poi.ss.usermodel.Workbook; import org.apache.poi.ss.usermodel.WorkbookFactory;   /** * 封装对excel的操作，包括本地读写excel和流中输出excel,支持office 2007。<br/> * 依赖于poi-3.9-20121203.jar,poi-ooxml-3.9-20121203.jar,poi-ooxml-schemas-3.9- * 20121203.jar,dom4j-1.6.1.jar<br/> * 有参构造函数参数为excel的全路径<br/> * * @author 宋立君 * @date 2014年07月03日 */ public class ExcelUtil {       // excel文件路径     private String path = "";       // 写入excel时，是否自动扩展列宽度来符合内容。     private boolean autoColumnWidth = false;       /**      * 无参构造函数 默认      */     public ExcelUtil() {     }       /**      * 有参构造函数      *      * @param path      *            excel路径      */     public ExcelUtil(String path) {         this.path = path;     }       /**      * 读取某个工作簿上的所有单元格的值。      *      * @param sheetOrder      *            工作簿序号，从0开始。      * @return List<Object[]> 所有单元格的值。      * @throws IOException      *             加载excel文件IO异常。      * @throws FileNotFoundException      *             excel文件没有找到异常。      * @throws InvalidFormatException      * @author 宋立君      * @date 2014年07月03日      */     public List<Object[]> read(int sheetOrder) throws FileNotFoundException,             IOException, InvalidFormatException {         FileInputStream fis = new FileInputStream(path);         Workbook workbook = WorkbookFactory.create(fis);         if (fis != null) {             fis.close();         }         Sheet sheet = workbook.getSheetAt(sheetOrder);         // 用来记录excel值         List<Object[]> valueList = new LinkedList<Object[]>();         // 循环遍历每一行、每一列。         for (Row row : sheet) {             // 每一行             Object[] rowObject = null;             for (Cell cell : row) {                 // cell.getCellType是获得cell里面保存的值的type                 switch (cell.getCellType()) {                 case Cell.CELL_TYPE_BOOLEAN:                     // 得到Boolean对象的方法                     rowObject = CollectionUtil.addObjectToArray(rowObject,                             cell.getBooleanCellValue());                     break;                 case Cell.CELL_TYPE_NUMERIC:                     // 先看是否是日期格式                     if (DateUtil.isCellDateFormatted(cell)) {                         // 读取日期格式                         rowObject = CollectionUtil.addObjectToArray(rowObject,                                 cell.getDateCellValue());                     } else {                         DecimalFormat df = new DecimalFormat();                         // 单元格的值,替换掉,                         String value = df.format(cell.getNumericCellValue())                                 .replace(",", "");                         // 读取数字                         rowObject = CollectionUtil.addObjectToArray(rowObject,                                 value);                     }                     break;                 case Cell.CELL_TYPE_FORMULA:                     // 读取公式                     rowObject = CollectionUtil.addObjectToArray(rowObject,                             cell.getCellFormula());                     break;                 case Cell.CELL_TYPE_STRING:                     // 读取String                     rowObject = CollectionUtil.addObjectToArray(rowObject, cell                             .getRichStringCellValue().toString());                     break;                 }             }             // 将这行添加到list。             valueList.add(rowObject);         }         return valueList;     }       /**      * 读取某个工作簿上的某个单元格的值。      *      * @param sheetOrder      *            工作簿序号,从0开始。      * @param colum      *            列数 从1开始      * @param row      *            行数 从1开始      * @return 单元格的值。      * @throws Exception      *             加载excel异常。      * @author 宋立君      * @date 2014年07月03日      */     public String read(int sheetOrder, int colum, int row) throws Exception {         FileInputStream fis = new FileInputStream(path);         Workbook workbook = WorkbookFactory.create(fis);         if (fis != null) {             fis.close();         }         Sheet sheet = workbook.getSheetAt(sheetOrder);         Row rows = sheet.getRow(row - 1);         Cell cell = rows.getCell(colum - 1);         String content = cell.getStringCellValue();         return content;     }       /**      * 在指定的工作簿、行、列书写值。      *      * @param sheetOrder      *            工作簿序号，基于0.      * @param colum      *            列 基于1      * @param row      *            行 基于1      * @param content      *            将要被书写的内容。      * @throws Exception      *             书写后保存异常。      * @author 宋立君      * @date 2014年07月03日      */     public void write(int sheetOrder, int colum, int row, String content)             throws Exception {         FileInputStream fis = new FileInputStream(path);         Workbook workbook = WorkbookFactory.create(fis);         if (fis != null) {             fis.close();         }         Sheet sheet = workbook.getSheetAt(sheetOrder);         Row rows = sheet.createRow(row - 1);         Cell cell = rows.createCell(colum - 1);         cell.setCellValue(content);         FileOutputStream fileOut = new FileOutputStream(path);         workbook.write(fileOut);         fileOut.close();       }       /**      * 得到一个工作区最后一条记录的序号，相当于这个工作簿共多少行数据。      *      * @param sheetOrder      *            工作区序号      * @return int 序号。      * @throws IOException      *             根据excel路径加载excel异常。      * @throws InvalidFormatException      * @author 宋立君      * @date 2014年07月03日      */     public int getSheetLastRowNum(int sheetOrder) throws IOException,             InvalidFormatException {         FileInputStream fis = new FileInputStream(path);         Workbook workbook = WorkbookFactory.create(fis);         if (fis != null) {             fis.close();         }         Sheet sheet = workbook.getSheetAt(sheetOrder);         return sheet.getLastRowNum();     }       /**      * 在磁盘生成一个含有内容的excel,路径为path属性      *      * @param sheetName      *            导出的sheet名称      * @param fieldName      *            列名数组      * @param data      *            数据组      * @throws IOException      * @author 宋立君      * @date 2014年07月03日      */     public void makeExcel(String sheetName, String[] fieldName,             List<Object[]> data) throws IOException {         // 在内存中生成工作薄         HSSFWorkbook workbook = makeWorkBook(sheetName, fieldName, data);         // 截取文件夹路径         String filePath = path.substring(0, path.lastIndexOf("\\"));         // 如果路径不存在，创建路径         File file = new File(filePath);         // System.out.println(path+"-----------"+file.exists());         if (!file.exists())             file.mkdirs();         FileOutputStream fileOut = new FileOutputStream(path);         workbook.write(fileOut);         fileOut.close();     }       /**      * 在输出流中导出excel。      *      * @param excelName      *            导出的excel名称 包括扩展名      * @param sheetName      *            导出的sheet名称      * @param fieldName      *            列名数组      * @param data      *            数据组      * @param response      *            response      * @throws IOException      *             转换流时IO错误      * @author 宋立君      * @date 2014年07月03日      */     public void makeStreamExcel(String excelName, String sheetName,             String[] fieldName, List<Object[]> data,             HttpServletResponse response) throws IOException {         OutputStream os = null;         response.reset(); // 清空输出流         os = response.getOutputStream(); // 取得输出流         response.setHeader("Content-disposition", "attachment; filename="                 + new String(excelName.getBytes(), "ISO-8859-1")); // 设定输出文件头         response.setContentType("application/msexcel"); // 定义输出类型         // 在内存中生成工作薄         HSSFWorkbook workbook = makeWorkBook(sheetName, fieldName, data);         os.flush();         workbook.write(os);     }       /**      * 根据条件，生成工作薄对象到内存。      *      * @param sheetName      *            工作表对象名称      * @param fieldName      *            首列列名称      * @param data      *            数据      * @return HSSFWorkbook      * @author 宋立君      * @date 2014年07月03日      */     private HSSFWorkbook makeWorkBook(String sheetName, String[] fieldName,             List<Object[]> data) {         // 用来记录最大列宽,自动调整列宽。         Integer collength[] = new Integer[fieldName.length];           // 产生工作薄对象         HSSFWorkbook workbook = new HSSFWorkbook();         // 产生工作表对象         HSSFSheet sheet = workbook.createSheet();         // 为了工作表能支持中文,设置字符集为UTF_16         workbook.setSheetName(0, sheetName);         // 产生一行         HSSFRow row = sheet.createRow(0);         // 产生单元格         HSSFCell cell;         // 写入各个字段的名称         for (int i = 0; i < fieldName.length; i++) {             // 创建第一行各个字段名称的单元格             cell = row.createCell((short) i);             // 设置单元格内容为字符串型             cell.setCellType(HSSFCell.CELL_TYPE_STRING);             // 为了能在单元格中输入中文,设置字符集为UTF_16             // cell.setEncoding(HSSFCell.ENCODING_UTF_16);             // 给单元格内容赋值             cell.setCellValue(new HSSFRichTextString(fieldName[i]));             // 初始化列宽             collength[i] = fieldName[i].getBytes().length;         }         // 临时单元格内容         String tempCellContent = "";         // 写入各条记录,每条记录对应excel表中的一行         for (int i = 0; i < data.size(); i++) {             Object[] tmp = data.get(i);             // 生成一行             row = sheet.createRow(i + 1);             for (int j = 0; j < tmp.length; j++) {                 cell = row.createCell((short) j);                 // 设置单元格字符类型为String                 cell.setCellType(HSSFCell.CELL_TYPE_STRING);                 tempCellContent = (tmp[j] == null) ? "" : tmp[j].toString();                 cell.setCellValue(new HSSFRichTextString(tempCellContent));                   // 如果自动调整列宽度。                 if (autoColumnWidth) {                     if (j >= collength.length) { // 标题列数小于数据列数时。                         collength = CollectionUtil.addObjectToArray(collength,                                 tempCellContent.getBytes().length);                     } else {                         // 如果这个内容的宽度大于之前最大的，就按照这个设置宽度。                         if (collength[j] < tempCellContent.getBytes().length) {                             collength[j] = tempCellContent.getBytes().length;                         }                     }                 }             }         }           // 自动调整列宽度。         if (autoColumnWidth) {             // 调整列为这列文字对应的最大宽度。             for (int i = 0; i < fieldName.length; i++) {                 sheet.setColumnWidth(i, collength[i] * 2 * 256);             }         }         return workbook;     }       /**      * 功能：设置写入excel时，是否自动扩展列宽度来符合内容，默认为false。      *      * @author 宋立君      * @date 2014年07月03日      * @param autoColumnWidth      *            true或者false      */     public void setAutoColumnWidth(boolean autoColumnWidth) {         this.autoColumnWidth = autoColumnWidth;     } }

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