最近在给通用做一个项目，很多功能块需要导入Excel模板，我正好研究了几天
Maven依赖
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-collections4</artifactId>
<version>4.1</version>
</dependency>
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>2.4</version>
</dependency>
<dependency>
<groupId>org.apache.xmlbeans</groupId>
<artifactId>xmlbeans</artifactId>
<version>2.6.0</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>3.17</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>3.17</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml-schemas</artifactId>
<version>3.17</version>
</dependency>如果你想简化你的代码，可以加上
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.16.10</version>
<scope>provided</scope>
</dependency>一、导入
模板示例
新建模板Bean
package com.phil.excel;
import lombok.Data;
@Data
public class RefPartExcel {
private String partNo;
private String partName;
private String refPartNo;
private String refPartName;;
private String length;
private String width;
}Lombok 注解在线帮助文档：http://projectlombok.org/features/index
介绍几个常用的 lombok 注解：
@Data ：注解在类上；提供类所有属性的 get 和 set 方法，此外还提供了equals、canEqual、hashCode、toString 方法
@Setter：注解在属性上；为属性提供 sett方法
@Getter：注解在属性上；为属性提供 get 方法
@Log4j ：注解在类上；为类提供一个 属性名为log 的 log4j 日志对象
@NoArgsConstructor：注解在类上；为类提供一个无参的构造方法
@AllArgsConstructor：注解在类上；为类提供一个全参的构造方法
加一个注解，让属性对应列名
package com.phil.annotation;
import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
@Target({ElementType.FIELD})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface ExcelColumn{
public String value() default "";
}这样Bean改写成
package com.phil.excel;
import com.phil.annotation.ExcelColumn;
import lombok.Data;
@Data
public class RefPartExcel {
@ExcelColumn("原零件号")
private String partNo;
@ExcelColumn("原零件名称")
private String partName;
@ExcelColumn("参考零件号")
private String refPartNo;
@ExcelColumn("参考零件名称")
private String refPartName;;
@ExcelColumn("长")
private String length;
@ExcelColumn("宽")
private String width;
}上传我是采用的MultipartFile，可以读取.xlsx或者.xls格式的Excel(POI3.15以上版本可以兼容，不用再分别读取了)
package com.phil.excel.util;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Field;
import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.regex.Pattern;
import org.apache.commons.io.IOUtils;
import org.apache.commons.lang3.time.FastDateFormat;
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;
import org.springframework.util.StringUtils;
import org.springframework.web.multipart.MultipartFile;
import com.phil.excel.annotation.ExcelColumn;
/**
* 功能说明：Excel 导入/导出
* 典型用法：无
* 特殊用法：无
* 创建者：phil
* 创建时间： 2017年11月9日
* 修改人：phil
* 修改时间：
* 修改原因：
* 修改内容：
* 版本号：1.0
*/
public class ExcelUtil {
private static final DecimalFormat DECIMAL_FORMAT = new DecimalFormat("0");// 格式化 number为整
private static final DecimalFormat DECIMAL_FORMAT_PERCENT = new DecimalFormat("##.00%");//格式化分比格式，后面不足2位的用0补齐
// private static final DecimalFormat df_per_ = new DecimalFormat("0.00%");//格式化分比格式，后面不足2位的用0补齐,比如0.00,%0.01%
// private static final SimpleDateFormat sdf = new SimpleDateFormat("yyyy/MM/dd"); // 格式化日期字符串
private static final FastDateFormat FAST_DATE_FORMAT = FastDateFormat.getInstance("yyyy/MM/dd");
private static final DecimalFormat DECIMAL_FORMAT_NUMBER = new DecimalFormat("0.00E000"); //格式化科学计数器
private static final Pattern POINTS_PATTERN = Pattern.compile("0.0+_*[^/s]+"); //小数匹配
/**
* 对外提供读取excel 的方法
* @param file
* @return
* @throws IOException
*/
public static List<List<Object>> readExcel(MultipartFile file) throws IOException {
String extension = file.getOriginalFilename().substring(file.getOriginalFilename().lastIndexOf(".") + 1).toLowerCase();
if(Objects.equals("xls", extension) || Objects.equals("xlsx", extension)) {
return readExcel(file.getInputStream());
} else {
throw new IOException("不支持的文件类型");
}
}
/**
* 对外提供读取excel 的方法
* @param file
* @param cls
* @return
* @throws IOException
*/
public static <T> List<T> readExcel(MultipartFile file, Class<T> cls) throws IOException {
String extension = file.getOriginalFilename().substring(file.getOriginalFilename().lastIndexOf(".") + 1).toLowerCase();
if(Objects.equals("xls", extension) || Objects.equals("xlsx", extension)) {
return readExcel(file.getInputStream(), cls);
} else {
throw new IOException("不支持的文件类型");
}
}
/**
* 读取 office excel
*
* @param stream
* @return
* @throws IOException
*/
private static List<List<Object>> readExcel(InputStream inputStream) throws IOException {
List<List<Object>> list = new LinkedList<>();
Workbook workbook = null;
try {
workbook = WorkbookFactory.create(inputStream);
int sheetsNumber = workbook.getNumberOfSheets();
for (int n = 0; n < sheetsNumber; n++) {
Sheet sheet = workbook.getSheetAt(n);
Object value = null;
Row row = null;
Cell cell = null;
for (int i = sheet.getFirstRowNum() + 1; i <= sheet.getPhysicalNumberOfRows(); i++) { // 从第二行开始读取
row = sheet.getRow(i);
if (StringUtils.isEmpty(row)) {
continue;
}
List<Object> linked = new LinkedList<>();
for (int j = row.getFirstCellNum(); j <= row.getLastCellNum(); j++) {
cell = row.getCell(j);
if (StringUtils.isEmpty(cell)) {
continue;
}
value = getCellValue(cell);
linked.add(value);
}
list.add(linked);
}
}
} catch (Exception e) {
e.printStackTrace();
} finally {
IOUtils.closeQuietly(workbook);
IOUtils.closeQuietly(inputStream);
}
return list;
}
/**
* 获取excel数据 将之转换成bean
*
* @param path
* @param cls
* @param <T>
* @return
*/
private static <T> List<T> readExcel(InputStream inputStream, Class<T> cls) {
List<T> dataList = new LinkedList<T>();
Workbook workbook = null;
try {
workbook = WorkbookFactory.create(inputStream);
Map<String, List<Field>> classMap = new HashMap<String, List<Field>>();
Field[] fields = cls.getDeclaredFields();
for (Field field : fields) {
ExcelColumn annotation = field.getAnnotation(ExcelColumn.class);
if (annotation != null) {
String value = annotation.value();
if (!classMap.containsKey(value)) {
classMap.put(value, new ArrayList<Field>());
}
field.setAccessible(true);
classMap.get(value).add(field);
}
}
Map<Integer, List<Field>> reflectionMap = new HashMap<Integer, List<Field>>();
int sheetsNumber = workbook.getNumberOfSheets();
for (int n = 0; n < sheetsNumber; n++) {
Sheet sheet = workbook.getSheetAt(n);
for (int j = sheet.getRow(0).getFirstCellNum(); j < sheet.getRow(0).getLastCellNum(); j++) { //首行提取注解
Object cellValue = getCellValue(sheet.getRow(0).getCell(j));
if (classMap.containsKey(cellValue)) {
reflectionMap.put(j, classMap.get(cellValue));
}
}
Row row = null;
Cell cell = null;
for (int i = sheet.getFirstRowNum() + 1; i < sheet.getPhysicalNumberOfRows(); i++) {
row = sheet.getRow(i);
T t = cls.newInstance();
for (int j = row.getFirstCellNum(); j < row.getLastCellNum(); j++) {
cell = row.getCell(j);
if (reflectionMap.containsKey(j)) {
Object cellValue = getCellValue(cell);
List<Field> fieldList = reflectionMap.get(j);
for (Field field : fieldList) {
try {
field.set(t, cellValue);
} catch (Exception e) {
//logger.error()
}
}
}
}
dataList.add(t);
}
}
} catch (Exception e) {
dataList = null;
} finally {
IOUtils.closeQuietly(workbook);
IOUtils.closeQuietly(inputStream);
}
return dataList;
}
/**
* 获取excel 单元格数据
*
* @param cell
* @return
*/
private static Object getCellValue(Cell cell) {
Object value = null;
switch (cell.getCellTypeEnum()) {
case _NONE:
break;
case STRING:
value = cell.getStringCellValue();
break;
case NUMERIC:
if(DateUtil.isCellDateFormatted(cell)){ //日期
value = FAST_DATE_FORMAT.format(DateUtil.getJavaDate(cell.getNumericCellValue()));//统一转成 yyyy/MM/dd
} else if("@".equals(cell.getCellStyle().getDataFormatString())
|| "General".equals(cell.getCellStyle().getDataFormatString())
|| "0_ ".equals(cell.getCellStyle().getDataFormatString())){
//文本 or 常规 or 整型数值
value = DECIMAL_FORMAT.format(cell.getNumericCellValue());
} else if(POINTS_PATTERN.matcher(cell.getCellStyle().getDataFormatString()).matches()){ //正则匹配小数类型
value = cell.getNumericCellValue(); //直接显示
} else if("0.00E+00".equals(cell.getCellStyle().getDataFormatString())){//科学计数
value = cell.getNumericCellValue(); //待完善
value = DECIMAL_FORMAT_NUMBER.format(value);
} else if("0.00%".equals(cell.getCellStyle().getDataFormatString())){//百分比
value = cell.getNumericCellValue(); //待完善
value = DECIMAL_FORMAT_PERCENT.format(value);
} else if("# ?/?".equals(cell.getCellStyle().getDataFormatString())){//分数
value = cell.getNumericCellValue(); 待完善
} else { //货币
value = cell.getNumericCellValue();
value = DecimalFormat.getCurrencyInstance().format(value);
}
break;
case BOOLEAN:
value = cell.getBooleanCellValue();
break;
case BLANK:
//value = ",";
break;
default:
value = cell.toString();
}
return value;
}
}控制层调用
@RequestMapping(value = "/fileUpload",method = RequestMethod.POST,
consumes = "application/json",produces = "application/json")
public Map<String, Object> fileUpload(HttpServletRequest request,@RequestParam("file") MultipartFile file) {
Map<String, Object> map = new HashMap<String, Object>();
// 判断文件是否为空
if (!StringUtils.isEmpty(file)) {
try {
List<RefPartExcel> excelBeans = ExcelUtil .readExcel(request,RefPartExcel.class);
System.out.println(excelBeans.size());
for(RefPartExcel ep : excelBeans){
System.out.println(ep.toString());
}
//........逻辑
} catch (Exception e) {
e.printStackTrace();
}
}
return map;
}读取成功之后遍历的结果
RefPartExcel [partNo=3739472432, partName=上海, refPartNo=50000001, refPartName=前轮驱动轴螺母1, length=8, width=12]
RefPartExcel [partNo=3739472433, partName=湖北, refPartNo=50000002, refPartName=前轮驱动轴螺母2, length=9, width=13]
RefPartExcel [partNo=3739472434, partName=陕西, refPartNo=50000003, refPartName=前轮驱动轴螺母3, length=10, width=14]
RefPartExcel [partNo=3739472435, partName=河南, refPartNo=50000004, refPartName=前轮驱动轴螺母4, length=11, width=15]
RefPartExcel [partNo=3739472436, partName=湖南, refPartNo=50000005, refPartName=前轮驱动轴螺母5, length=12, width=16]PS：当然了，如果模板的Excel之中文本或者常规有小数，百分比之类的，还是先规范下模板吧。。。
二、导出
导出可选xls或者xlsx格式，逻辑和样式都比较简单，并没有选择模板
package com.phil.excel.model;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Collection;
import java.util.Date;
import java.util.Iterator;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.apache.commons.io.IOUtils;
import org.apache.commons.lang3.time.FastDateFormat;
import org.apache.poi.hssf.usermodel.HSSFClientAnchor;
import org.apache.poi.hssf.usermodel.HSSFRichTextString;
import org.apache.poi.ss.usermodel.BorderStyle;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.ClientAnchor;
import org.apache.poi.ss.usermodel.ClientAnchor.AnchorType;
import org.apache.poi.ss.usermodel.Comment;
import org.apache.poi.ss.usermodel.Drawing;
import org.apache.poi.ss.usermodel.FillPatternType;
import org.apache.poi.ss.usermodel.Font;
import org.apache.poi.ss.usermodel.HorizontalAlignment;
import org.apache.poi.ss.usermodel.IndexedColors;
import org.apache.poi.ss.usermodel.RichTextString;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.VerticalAlignment;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.streaming.SXSSFWorkbook;
import org.apache.poi.xssf.usermodel.XSSFClientAnchor;
import org.apache.poi.xssf.usermodel.XSSFRichTextString;
import org.springframework.util.StringUtils;
/**
* 功能说明：导出模板(待重构)
* 典型用法：无
* 特殊用法：无
* 创建者：phil
* 创建时间： 2017年10月13日
* 修改人：phil
* 修改时间：2017年10月18日
* 修改原因： 升级poi3.17 重写 修改内容： 版本号：2.0
*/
public class ExportExcel<T> {
/**
*
* @param sheetTitle
* sheet名称
* @param headers
* 列表标题
* @param dataset
* 内容
* @param out
*/
// public void exportExcel(String sheetTitle, String[] headers, String[]
// columns, Collection<T> dataset,
// OutputStream out, String datePattern) {
// exportExcelByColumn(sheetTitle, headers, columns, dataset, out, datePattern);
// }
/**
* 导出 xls格式Excel HSSF
* @param title
* @param headers
* @param columns
* @param dataset
* @param out
* @param pattern
*/
public void exportHSExcelByColumn(String title, String[] headers, String[] columns, Collection<T> dataset,
OutputStream out, String pattern) {
Workbook workbook = new SXSSFWorkbook();
// 生成一个表格
Sheet sheet = workbook.createSheet(title);
// 设置表格默认列宽度为20个字节
sheet.setDefaultColumnWidth(20);
sheet.setDefaultRowHeightInPoints(24);
// 生成一个 表格标题行样式
CellStyle style = workbook.createCellStyle();
// 设置这些样式
style.setFillForegroundColor(IndexedColors.GREY_25_PERCENT.getIndex());
style.setFillPattern(FillPatternType.SOLID_FOREGROUND);
style.setBorderBottom(BorderStyle.THIN);
style.setBorderLeft(BorderStyle.THIN);
style.setBorderRight(BorderStyle.THIN);
style.setBorderTop(BorderStyle.THIN);
style.setAlignment(HorizontalAlignment.CENTER);
// 生成一个字体
Font font = workbook.createFont();
font.setColor(IndexedColors.WHITE.getIndex());
font.setFontHeightInPoints((short) 12);
font.setBold(true);
// font.setBoldweight((short)700));
// 把字体应用到当前的样式
style.setFont(font);
// 生成并设置另一个样式 内容的背景
CellStyle style2 = workbook.createCellStyle();
style2.setFillForegroundColor(IndexedColors.WHITE.getIndex());
style2.setFillPattern(FillPatternType.SOLID_FOREGROUND);
style2.setBorderBottom(BorderStyle.THIN);
style2.setBorderLeft(BorderStyle.THIN);
style2.setBorderRight(BorderStyle.THIN);
style2.setBorderTop(BorderStyle.THIN);
style2.setAlignment(HorizontalAlignment.CENTER);
style2.setVerticalAlignment(VerticalAlignment.CENTER);
// 生成另一个字体
Font font2 = workbook.createFont();
font.setBold(true);
// font2.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);
// 把字体应用到当前的样式
style2.setFont(font2);
// 声明一个画图的顶级管理器
Drawing<?> patriarch = sheet.createDrawingPatriarch();
// 定义注释的大小和位置
Comment comment = patriarch.createCellComment(new HSSFClientAnchor(0, 0, 0,
0, (short)4, 2, (short)6, 5));
// 设置注释内容
comment.setString(new HSSFRichTextString("Created By Phil"));
// 设置注释作者，当鼠标移动到单元格上是可以在状态栏中看到该内容.
comment.setAuthor("phil");
// 产生表格标题行
Row row = sheet.createRow(0);
for (int i = 0; i < headers.length; i++) {
Cell cell = row.createCell(i);
cell.setCellStyle(style);
RichTextString text = new HSSFRichTextString(headers[i]);
cell.setCellValue(text);
}
if(StringUtils.isEmpty(pattern)) {
pattern = "yyyy/MM/dd";
}
FastDateFormat instance = FastDateFormat.getInstance(pattern);
// 遍历集合数据，产生数据行
Iterator<T> it = dataset.iterator();
int index = 0;
int count = 0;
while (it.hasNext()) {
index++;
row = sheet.createRow(index);
T t = (T) it.next();
// 利用反射，根据javabean属性的先后顺序，动态调用getXxx()方法得到属性值
// Field[] fields = t.getClass().getDeclaredFields();
count = headers.length < columns.length ? headers.length : columns.length;
for (int i = 0; i < count; i++) {
Cell cell = row.createCell(i);
cell.setCellStyle(style2);
String fieldName = columns[i];
String getMethodName = "get" + fieldName.substring(0, 1).toUpperCase() + fieldName.substring(1);
try {
Class<? extends Object> tCls = t.getClass();
Method getMethod = tCls.getMethod(getMethodName, new Class[] {});
Object value = getMethod.invoke(t, new Object[] {});
// 判断值的类型后进行强制类型转换
String textValue = null;
if (value instanceof Date) {
Date date = (Date) value;
textValue = instance.format(date);
} else if (value instanceof byte[]) {
// 有图片时，设置行高为60px;
row.setHeightInPoints(60);
// 设置图片所在列宽度为80px,注意这里单位的一个换算
sheet.setColumnWidth(i, (short) (35.7 * 80));
// sheet.autoSizeColumn(i);
byte[] bsValue = (byte[]) value;
ClientAnchor anchor = new HSSFClientAnchor(0, 0, 1023, 255, (short) 6, index, (short) 6, index);
anchor.setAnchorType(AnchorType.MOVE_DONT_RESIZE);
patriarch.createPicture(anchor, workbook.addPicture(bsValue, SXSSFWorkbook.PICTURE_TYPE_JPEG));
} else {
// 其它数据类型都当作字符串简单处理
// if (value != null) {
// textValue = value.toString();
// if (textValue.equalsIgnoreCase("VLD")) {
// textValue = "有效";
// } else if (textValue.equalsIgnoreCase("IVD")) {
// textValue = "无效";
// }
// } else {
// textValue = "";
// }
}
// 如果不是图片数据，就利用正则表达式判断textValue是否全部由数字组成
if (textValue != null) {
Pattern p = Pattern.compile("^//d+(//.//d+)?$");
Matcher matcher = p.matcher(textValue);
if (matcher.matches()) {
// 是数字当作double处理
cell.setCellValue(Double.parseDouble(textValue));
} else {
RichTextString richString = new HSSFRichTextString(textValue);
Font font3 = workbook.createFont();
font3.setColor(IndexedColors.BLACK.index); // 内容
richString.applyFont(font3);
cell.setCellValue(richString);
}
}
} catch (SecurityException e) {
e.printStackTrace();
} catch (NoSuchMethodException e) {
e.printStackTrace();
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
}
}
}
try {
workbook.write(out);
} catch (IOException e) {
e.printStackTrace();
} finally {
IOUtils.closeQuietly(workbook);
IOUtils.closeQuietly(out);
}
}
/**
* 导出 xlsx格式Excel XSSF
* @param title
* @param headers
* @param columns
* @param dataset
* @param out
* @param pattern
*/
public void exportXSExcelByColumn(String title, String[] headers, String[] columns,
Collection<Map<String, Object>> dataset, OutputStream out, String pattern) {
Workbook workbook = new SXSSFWorkbook();
// 生成一个表格
Sheet sheet = workbook.createSheet(title);
// 设置表格默认列宽度为20个字节
sheet.setDefaultColumnWidth(20);
sheet.setDefaultRowHeightInPoints(24);
// 生成一个 表格标题行样式
CellStyle style = workbook.createCellStyle();
// 设置这些样式
style.setFillForegroundColor(IndexedColors.GREY_25_PERCENT.getIndex());
style.setFillPattern(FillPatternType.SOLID_FOREGROUND);
style.setBorderBottom(BorderStyle.THIN);
style.setBorderLeft(BorderStyle.THIN);
style.setBorderRight(BorderStyle.THIN);
style.setBorderTop(BorderStyle.THIN);
style.setAlignment(HorizontalAlignment.CENTER);
// 生成一个字体
Font font = workbook.createFont();
font.setColor(IndexedColors.WHITE.getIndex());
font.setFontHeightInPoints((short) 12);
font.setBold(true);
// font.setBoldweight((short)700));
// 把字体应用到当前的样式
style.setFont(font);
// 生成并设置另一个样式 内容的背景
CellStyle style2 = workbook.createCellStyle();
style2.setFillForegroundColor(IndexedColors.WHITE.getIndex());
style2.setFillPattern(FillPatternType.SOLID_FOREGROUND);
style2.setBorderBottom(BorderStyle.THIN);
style2.setBorderLeft(BorderStyle.THIN);
style2.setBorderRight(BorderStyle.THIN);
style2.setBorderTop(BorderStyle.THIN);
style2.setAlignment(HorizontalAlignment.CENTER);
style2.setVerticalAlignment(VerticalAlignment.CENTER);
// 生成另一个字体
Font font2 = workbook.createFont();
font.setBold(true);
// font2.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);
// 把字体应用到当前的样式
style2.setFont(font2);
// 声明一个画图的顶级管理器
Drawing<?> patriarch = sheet.createDrawingPatriarch();
// 定义注释的大小和位置
Comment comment = patriarch.createCellComment(new XSSFClientAnchor(0, 0, 0,
0, (short)4, 2, (short)6, 5));
//设置注释内容
comment.setString(new XSSFRichTextString("Created By Phil"));
// 设置注释作者，当鼠标移动到单元格上是可以在状态栏中看到该内容.
comment.setAuthor("phil");
// 产生表格标题行
Row row = sheet.createRow(0);
for (int i = 0; i < headers.length; i++) {
Cell cell = row.createCell(i);
cell.setCellStyle(style);
RichTextString text = new XSSFRichTextString(headers[i]);
cell.setCellValue(text);
}
if(StringUtils.isEmpty(pattern)) {
pattern = "yyyy/MM/dd";
}
FastDateFormat instance = FastDateFormat.getInstance(pattern);
// 遍历集合数据，产生数据行
Iterator<Map<String, Object>> it = dataset.iterator(); // 多个Map集合
int index = 0;
int count = 0;
while (it.hasNext()) {
index++;
row = sheet.createRow(index);
Map<String, Object> map = it.next();
count = headers.length < columns.length ? headers.length : columns.length;
for (int i = 0; i < count; i++) {
Cell cell = row.createCell(i);
cell.setCellStyle(style2);
try {
Object value = map.get(columns[i]);
// 判断值的类型后进行强制类型转换
String textValue = null;
if (value instanceof Date) {
Date date = (Date) value;
textValue = instance.format(date);
} else if (value instanceof byte[]) {
// 有图片时，设置行高为60px;
row.setHeightInPoints(60);
// 设置图片所在列宽度为80px,注意这里单位的一个换算
sheet.setColumnWidth(i, (short) (35.7 * 80));
// sheet.autoSizeColumn(i);
byte[] bsValue = (byte[]) value;
ClientAnchor anchor = new XSSFClientAnchor(0, 0, 1023, 255, (short) 6, index, (short) 6, index);
anchor.setAnchorType(AnchorType.MOVE_DONT_RESIZE);
patriarch.createPicture(anchor, workbook.addPicture(bsValue, Workbook.PICTURE_TYPE_JPEG));
} else {
// 其它数据类型都当作字符串简单处理
if (value != null) {
textValue = value.toString();
// if (textValue.equalsIgnoreCase("VLD")) {
// textValue = "有效";
// } else if (textValue.equalsIgnoreCase("IVD")) {
// textValue = "无效";
// }
} else {
textValue = "";
}
}
// 如果不是图片数据，就利用正则表达式判断textValue是否全部由数字组成
if (textValue != null) {
Pattern p = Pattern.compile("^//d+(//.//d+)?$");
Matcher matcher = p.matcher(textValue);
if (matcher.matches()) {
// 是数字当作double处理
cell.setCellValue(Double.parseDouble(textValue));
} else {
RichTextString richString = new XSSFRichTextString(textValue);
Font font3 = workbook.createFont();
font3.setColor(IndexedColors.BLACK.index); // 内容
richString.applyFont(font3);
cell.setCellValue(richString);
}
}
} catch (SecurityException e) {
e.printStackTrace();
}
}
}
try {
workbook.write(out);
} catch (IOException e) {
e.printStackTrace();
} finally {
IOUtils.closeQuietly(workbook);
IOUtils.closeQuietly(out);
}
}
}控制层调用示例
package com.phil.download;
import java.io.IOException;
import java.io.OutputStream;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.servlet.http.HttpServletResponse;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.util.StringUtils;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import com.phil.excel.model.ExportExcel;
import com.phil.service.QuestionService;
@Controller
@RequestMapping("api/download")
public class DownloadController {
private static String EXPORT_XLSX_FILE_SUFFIX = ".xlsx";
// private static String EXPORT_XLS_FILE_SUFFIX = ".xls";
@Autowired
private QuestionService questionService;
@GetMapping("export")
public void export(Map<String, Object> map ,HttpServletResponse response) {
List<Map<String, Object>> list = questionService.findByPage(new HashMap<>());
for(int i = 0; i < 100000; i++) { //数据库为空,遍历了100000个
Map<String, Object> temp_ = new HashMap<>();
temp_.put("id", i + 1);
temp_.put("number", i + 1);
temp_.put("description", (i + 1) + "描述");
list.add(temp_);
}
ExportExcel<List<Map<String, Object>>> exportExcel = new ExportExcel<>();
StringBuffer filename = new StringBuffer();
filename.append("导出");
filename.append(System.currentTimeMillis());
if(StringUtils.isEmpty(map.get("excel_type"))) {
filename.append(EXPORT_XLSX_FILE_SUFFIX);
} else {
filename.append(map.get("excel_type"));
}
OutputStream out = null;
try {
response.setContentType("application/vnd.ms-excel");
response.setHeader("Content-disposition", "attachment;filename=" + new String(filename.toString().getBytes("UTF-8"), "ISO8859-1"));
out = response.getOutputStream();
exportExcel.exportXSExcelByColumn("Title", new String[] {"id", "number", "description"}, new String[] {"id", "number", "description"},
list, out ,null);
} catch (IOException e) {
}
}
}