登录与注册
UserDaoilpl.java
package utils; import java.io.IOException; import java.net.MalformedURLException; import java.net.URL; import java.text.SimpleDateFormat; import java.util.Date; import java.util.Set; import java.util.HashMap; import java.util.Iterator; import java.util.Map; import org.apache.http.client.config.RequestConfig; import org.apache.http.client.methods.CloseableHttpResponse; import org.apache.http.client.methods.HttpGet; import org.apache.http.client.utils.URIBuilder; import org.apache.http.impl.client.CloseableHttpClient; import org.apache.http.impl.client.HttpClients; import org.apache.http.impl.conn.PoolingHttpClientConnectionManager; import org.jsoup.Jsoup; import org.jsoup.nodes.Attributes; import org.jsoup.nodes.Document; import org.jsoup.nodes.Element; import org.jsoup.select.Elements; import dao.dao; import entity.Cvf; /** * 这是使用Jsoup解析 */ public class Jsouputil { /** * 使用Selector选择器获取元素 */ public static void testSelector()throws Exception{ //获取Document对象 HttpClientPool httpClientPool =new HttpClientPool(); //创建连接池管理器 PoolingHttpClientConnectionManager cm =new PoolingHttpClientConnectionManager(); //获取网页HTML字符串 String content=httpClientPool.doGet(cm); //解析字符串 Document doc = Jsoup.parse(content); // System.out.println(doc.toString()); //[attr=value],利用属性获取 Elements elements = doc.select("div[id=content]").select("dl").select("dt[class=ptitle]"); System.out.println(elements.toString()); Cvf cvf=new Cvf(); dao dao=new dao(); if(elements!=null) { for(Element ele:elements) { String href="http://openaccess.thecvf.com/"; String cname=ele.select("a").text(); System.out.println(cname); String href2=ele.select("a").attr("href"); String chref=href.concat(href2); System.out.println(chref); String cabstract =null; String ckeyword =null; //获取title的内容 CloseableHttpClient httpClient = HttpClients.custom().setConnectionManager(cm).build(); //创建URIBuilder URIBuilder uribuilder= new URIBuilder(chref); HttpGet httpGet= new HttpGet(uribuilder.build()); RequestConfig config = RequestConfig.custom().setConnectTimeout(10000*10000)//设置创建连接的最长时间,单位为毫秒 .setConnectionRequestTimeout(10000*10000)//设置获取连接的最长时间,单位为毫秒 .setSocketTimeout(100000*1000000)//设置传输数据的最长时间,单位为毫秒 .build(); //给请求设置请求信息 httpGet.setConfig(config); CloseableHttpResponse response=null; response = httpClient.execute(httpGet); //解析响应,获取数据 //判断状态码是否为两百 if(response.getStatusLine().getStatusCode()==200||response.getStatusLine().getStatusCode()==302) { Document document = Jsoup.parse(new URL(chref), 100000); cabstract = document.select("div[id=abstract]").text(); System.out.println("已获取摘要"); String[] strs = strTostrArray(cname+cabstract); ckeyword=keyword(strs); } else { System.out.println(response.getStatusLine().getStatusCode()); cabstract =null; ckeyword=null; } if(response!=null) { //关闭response response.close(); } cvf=new Cvf(cname,chref,cabstract,ckeyword); dao.add(cvf); } } } public static String[] strTostrArray(String str) { /* * 将非字母字符全部替换为空格字符" " 得到一个全小写的纯字母字符串包含有空格字符 */ str = str.toLowerCase();// 将字符串中的英文部分的字符全部变为小写 String regex = "[\W]+";// 非字母的正则表达式 --W:表示任意一个非单词字符 str = str.replaceAll(regex, " "); String[] strs = str.split(" "); // 以空格作为分隔符获得字符串数组 return strs; } public static String keyword(String[] strs) { /* * 建立字符串(String)出现次数(Integer)的映射 */ HashMap<String, Integer> strhash = new HashMap<String, Integer>(); Integer in = null;// 用于存放put操作的返回值 for (String s : strs) {// 遍历数组 strs in = strhash.put(s, 1); if (in != null) {// 判断如果返回的不是null,则+1再放进去就是出现的次数 strhash.put(s, in + 1); } } Set<java.util.Map.Entry<String, Integer>> entrySet = strhash.entrySet(); String maxStr = null;// 用于存放出现最多的单词 int maxValue = 0;// 用于存放出现最多的次数 for (java.util.Map.Entry<String, Integer> e : entrySet) { String key = e.getKey(); Integer value = e.getValue(); if(key.equals("a")||key.equals("the")||key.equals("to")||key.equals("and")||key.equals("in")||key.equals("of")||key.equals("our")||key.equals("your")||key.equals("we")||key.equals("is")||key.equals("on")||key.equals("for")||key.equals("that")||key.equals("an")||key.equals("are")) { value=0; } if (value > maxValue) { maxValue = value;// 这里有自动拆装箱 maxStr = key; } } System.out.println("出现最多的单词是:" + maxStr + "出现了" + maxValue + "次"); return maxStr; } }
User.java
package com.zzw.entity; public class User { private int uid; private String uname; private String upwd; private String type; public int getUid() { return uid; } public void setUid(int uid) { this.uid = uid; } public String getUname() { return uname; } public void setUname(String uname) { this.uname = uname; } public String getUpwd() { return upwd; } public void setUpwd(String upwd) { this.upwd = upwd; } public String getType() { return type; } public void setType(String type) { this.type = type; } @Override public String toString() { return "User [uid=" + uid + ", uname=" + uname + ", upwd=" + upwd + ", type=" + type + "]"; } public User() { super(); } public User(String uname, String upwd, String type) { super(); this.uname = uname; this.upwd = upwd; this.type = type; } public User(int uid, String uname, String upwd, String type) { super(); this.uid = uid; this.uname = uname; this.upwd = upwd; this.type = type; } public User(String uname, String upwd) { super(); this.uname = uname; this.upwd = upwd; } }
UserServicelipl.java
package com.zzw.service.Impl; import java.util.List; import com.zzw.dao.IUserDao; import com.zzw.dao.Impl.UserDaoImpl; import com.zzw.entity.User; import com.zzw.service.IUserService; public class UserServiceImpl implements IUserService{ IUserDao userdao= new UserDaoImpl(); //登录 public User Login(User user) { return userdao.Login(user.getUname(),user.getUpwd()); } //注册 public boolean Register(User user) { boolean flag=false; if(!userdao.isExist(user.getUname())) { userdao.Register(user); flag=true; }else { System.out.println("此人已存在"); } return flag; } //根据账号查询用户 public User Query(String uname) { return userdao.Query(uname); } }
LoginServlet.java
package com.zzw.servlet; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import com.zzw.entity.User; import com.zzw.service.IUserService; import com.zzw.service.Impl.UserServiceImpl; public class LoginServlet extends HttpServlet { protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setCharacterEncoding("utf-8"); response.setCharacterEncoding("utf-8"); response.setContentType("text/html; charset=utf-8"); String name= request.getParameter("uname"); String pwd= request.getParameter("upwd"); User user = new User(name,pwd); //接口 x=new 实现类() IUserService userservice = new UserServiceImpl(); User user2=userservice.Login(user); String rs=user2.getType(); if(rs.equals("1")) { request.setAttribute("message ","noerror"); request.getRequestDispatcher("index1.jsp").forward(request, response); }else if(rs.equals("2")) { request.setAttribute("message","noerror"); request.getRequestDispatcher("index.jsp").forward(request, response); } else { request.setAttribute("message","error"); request.getRequestDispatcher("login.jsp").forward(request, response); } } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub doGet(request, response); } }
RegisterServlet.java
package com.zzw.servlet; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import com.zzw.entity.User; import com.zzw.service.IUserService; import com.zzw.service.Impl.UserServiceImpl; public class RegisterServlet extends HttpServlet { protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setCharacterEncoding("utf-8"); response.setCharacterEncoding("utf-8"); response.setContentType("text/html; charset=utf-8"); String name= request.getParameter("uname"); String pwd= request.getParameter("upwd"); String type= request.getParameter("type"); User user = new User(name,pwd,type); //接口 x=new 实现类() IUserService userservice = new UserServiceImpl(); boolean result=userservice.Register(user); if(!result) { request.setAttribute("message","error"); request.getRequestDispatcher("register.jsp").forward(request, response); }else { request.setAttribute("message","noerror"); request.getRequestDispatcher("register.jsp").forward(request, response); } } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub doGet(request, response); } }
DBUtil.java
package com.zzw.utils; import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; import java.util.ArrayList; import java.util.List; public class DBUtil { //数据库URL和账号密码 public static final String URL="jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=GB18030&useSSL=false&serverTimezone=GMT&allowPublicKeyRetrieval=true";//数据源 !!!!注意若出现加载或者连接数据库失败一般是这里出现问题 private static final String UNAME="root"; private static final String UPWD="1234"; public static PreparedStatement pstmt=null; public static ResultSet rs = null; public static Connection connection=null; //增删改 public static boolean executeUpdate(String sql,Object [] params) { boolean flag = false; try { //a.导入驱动,加载具体的驱动类 Class.forName("com.mysql.cj.jdbc.Driver"); //b.与数据库建立连接 connection = DriverManager.getConnection(URL,UNAME,UPWD); pstmt = connection.prepareStatement(sql); for(int i=0;i<params.length;i++) { pstmt.setObject(i+1, params[i]); } int count=pstmt.executeUpdate();//返回值表示,增删改几条数据 //处理结果 if(count>0) { System.out.println("操作成功!!!"); flag=true; } }catch(ClassNotFoundException e) { e.printStackTrace(); }catch(SQLException e) { e.printStackTrace(); }catch(Exception e){ e.printStackTrace(); }finally { try { //先开的后关,后开的先关 if(pstmt!=null)pstmt.close(); if(connection !=null)connection.close(); }catch(SQLException e) { e.printStackTrace(); }finally { } } return flag; } //查 public static ResultSet executeQuery(String sql,Object [] params) { try { //a.导入驱动,加载具体的驱动类 Class.forName("com.mysql.cj.jdbc.Driver"); //b.与数据库建立连接 connection = DriverManager.getConnection(URL,UNAME,UPWD); pstmt = connection.prepareStatement(sql); if(params!=null) { for(int i=0;i<params.length;i++) { pstmt.setObject(i+1, params[i]); } } rs = pstmt.executeQuery(); return rs; }catch(ClassNotFoundException e) { e.printStackTrace(); return null; }catch(SQLException e) { e.printStackTrace(); return null; }catch(Exception e){ e.printStackTrace(); return null; } } }