• SQL前后端分页


    /class Page<T>

    package com.neusoft.bean;
    
    import java.util.List;
    
    public class Page<T> {
    	private List<T> data;   //后台数据库查询出来
    	private int totalRecord; //表示总共有多少记录,从数据库中查询出来
    	
    //	private int totalPage;  // 表示总共有多少页,计算得到!
    //	private int index;   //表示当前索引值,计算出来的!
    	
    	private int pageNumber; //表示的是当前页码,这个参数是从页面传递过来的!
    	private int pageSize;  //表示的是每页显示多少条数据 ,在servlet中设置的!
    	private String path;
    	
    	
    	public Page() {
    		super();
    	}
    	
    	public Page(int totalRecord, int pageNumber, int pageSize) {
    		super();
    		this.totalRecord = totalRecord;
    		this.pageNumber = pageNumber;
    		this.pageSize = pageSize;
    	}
    
    
    	
    	public String getPath() {
    		return path;
    	}
    
    	public void setPath(String path) {
    		this.path = path;
    	}
    
    	public List<T> getData() {
    		return data;
    	}
    
    	public void setData(List<T> data) {
    		this.data = data;
    	}
    
    	public int getTotalRecord() {
    		return totalRecord;
    	}
    
    	public void setTotalRecord(int totalRecord) {
    		this.totalRecord = totalRecord;
    	}
    
    	public int getTotalPage() {
    		/**
    		 * totalPage:表示总共有几页!
    		 * 
    		 *					 总页数          totalRecord[总记录数]    pageSize
    		 *                     5        10                     2
    		 *                     5         9                     2
    		 *                     4         8                     2
    		 */
    		if(totalRecord % pageSize ==0){
    			return totalRecord / pageSize;
    		}
    		
    		return (totalRecord / pageSize + 1);
    	}
    
    	public int getIndex() {
    		/**
    		 * index表示的是当前索引值,是计算得到的!
    		 *             当前索引值           每页显示几条数据               当前页是第几页
    		 *                0           3                 1
    		 *                3           3                 2
    		 *        
    				index  = (pageNumber -1)*pageSize;
    		 */
    		return (getPageNumber() -1)*pageSize;
    	}
    
    	
    	public int getPageNumber() {
    		if(pageNumber < 1){
    			return 1;
    		}else if(pageNumber > getTotalPage()){
    			return getTotalPage();
    		}
    		return pageNumber;
    	}
    
    	
    	public int getPageSize() {
    		return pageSize;
    	}
    
    	public void setPageSize(int pageSize) {
    		this.pageSize = pageSize;
    	}
    
    }
    

      /class Student

    package com.neusoft.bean;
    
    public class Student {
    	private  int id;
    	private  String name;
    	private  String school;
    	private  String score;
    	public Student() {
    		super();
    		// TODO Auto-generated constructor stub
    	}
    	public Student(int id, String name, String school, String score) {
    		super();
    		this.id = id;
    		this.name = name;
    		this.school = school;
    		this.score = score;
    	}
    	public int getId() {
    		return id;
    	}
    	public void setId(int id) {
    		this.id = id;
    	}
    	public String getName() {
    		return name;
    	}
    	public void setName(String name) {
    		this.name = name;
    	}
    	public String getSchool() {
    		return school;
    	}
    	public void setSchool(String school) {
    		this.school = school;
    	}
    	public String getScore() {
    		return score;
    	}
    	public void setScore(String score) {
    		this.score = score;
    	}
    	@Override
    	public String toString() {
    		return "Student [id=" + id + ", name=" + name + ", school=" + school + ", score=" + score + "]";
    	}
    	
    }
    

      /class StudentDao

    package com.neusoft.dao;
    
    import java.sql.Connection;
    import java.sql.PreparedStatement;
    import java.sql.ResultSet;
    import java.sql.SQLException;
    import java.util.ArrayList;
    import java.util.List;
    
    import com.neusoft.bean.Student;
    import com.neusoft.utils.JDBCUtil;
    
    public class StudentDao {
    	 public List<Student> getStudentList(){    	  	
        	 PreparedStatement ps=null;
        	 ResultSet rs =null;
        	 List<Student> list=new ArrayList<Student>();
        	 Connection conn=JDBCUtil.getConnection();
        	 String sql="select * from student";
        	 try {
        		  ps = conn.prepareStatement(sql);
                  
                  rs = ps.executeQuery();
    			while (rs.next()) {
    				Student stu=new Student();
    				int id = rs.getInt("id");
    				String username = rs.getString("name");
    				String school = rs.getString("school");
    				String score = rs.getString("score");
    				stu.setId(id);
    				stu.setName(username);
    				stu.setSchool(school);
    				stu.setScore(score);
    				list.add(stu);
    			}
    		} catch (SQLException e) {
    			// TODO Auto-generated catch block
    			e.printStackTrace();
    		}finally {			
    			JDBCUtil.close(ps, rs, conn);
    		}
    		return list;
        	 
         }
    	   public static int delete(int id){
    			return JDBCUtil.executeUpdate("delete from student where id=?",id);
    			
    		}
    		public int update(Student student){
    			return JDBCUtil.executeUpdate("update student set name=?,school=?,score=? where id=?",student.getName(),student.getSchool(),student.getScore(),student.getId());
    		}
    		
    		public int add(Student student){
    			return JDBCUtil.executeUpdate("insert into student (id,name,school,score) values (?,?,?,?)",null,student.getName(),student.getSchool(),student.getScore());
    		}
    		 public List<Student> getStudent(Student student){    	  	
    	    	 PreparedStatement ps=null;
    	    	 ResultSet rs =null;
    	    	 List<Student> list=new ArrayList<Student>();
    	    	 Connection conn=JDBCUtil.getConnection();
    	    	 String sql="select * from student where  name= '"+student.getName()+"'";
    	    	 try {
    	    		  ps = conn.prepareStatement(sql);	              
    	              rs = ps.executeQuery();
    				while (rs.next()) {
    					Student stu=new Student();
    					int id = rs.getInt("id");
    					String username = rs.getString("name");
    					String school = rs.getString("school");
    					String score = rs.getString("score");
    					stu.setId(id);
    					stu.setName(username);
    					stu.setSchool(school);
    					stu.setScore(score);
    					list.add(stu);
    				}
    			} catch (SQLException e) {
    				// TODO Auto-generated catch block
    				e.printStackTrace();
    			}finally {			
    				JDBCUtil.close(ps, rs, conn);
    			}
    			return list;
    	    	 
    	     }
    		public Student getStuInfoById(String id) {
    			 PreparedStatement ps=null;
    	    	 ResultSet rs =null;
    			 Student stu=null;
    	    	 List<Student> list=new ArrayList<Student>();
    	    	 Connection conn=JDBCUtil.getConnection();
    	    	 String sql="select * from student where id = ?";
    	    	 try {
    	    		  ps = conn.prepareStatement(sql);
    	              ps.setInt(1, Integer.parseInt(id));
    	              rs = ps.executeQuery();
    				while (rs.next()) {	
    					stu=new Student();
    					String username = rs.getString("name");
    					String school = rs.getString("school");
    					String score = rs.getString("score");
    					stu.setId(Integer.parseInt(id));
    					stu.setName(username);
    					stu.setSchool(school);
    					stu.setScore(score);
    					list.add(stu);
    				}
    			} catch (SQLException e) {
    				// TODO Auto-generated catch block
    				e.printStackTrace();
    			}finally {			
    				JDBCUtil.close(ps, rs, conn);
    			}
    			return stu;
    		}
    		public int getTotalRecord() {
    			PreparedStatement ps=null;
    	    	 ResultSet rs =null;
    	    	 Connection conn=JDBCUtil.getConnection();
    	    	 String sql="select count(*) as total from student ";
    	    	 int total=0;
    	    	 try {
    	    		  ps = conn.prepareStatement(sql);
    	              rs = ps.executeQuery();
    				while (rs.next()) {	
    					total= rs.getInt("total");
    				}
    			} catch (SQLException e) {
    				// TODO Auto-generated catch block
    				e.printStackTrace();
    			}finally {			
    				JDBCUtil.close(ps, rs, conn);
    			}
    			return total;
    		}
    		public List<Student> getLimitStuList(int index, int pageSize) {
    			PreparedStatement ps=null;
    	    	 ResultSet rs =null;
    	    	 Connection conn=JDBCUtil.getConnection();
    	    	 String sql="select *  from student limit ? , ?";
    	    	 List<Student> list= new ArrayList<Student>();
    	    	 try {
    	    		  ps = conn.prepareStatement(sql);
    	    		  ps.setInt(1, index);
    	    		  ps.setInt(2, pageSize);
    	              rs = ps.executeQuery();
    				while (rs.next()) {	
    					int id=rs.getInt("id");
    					String name = rs.getString("name");
    					String school = rs.getString("school");
    					String score = rs.getString("score");
    					list.add(new Student(id,name,school,score));
    				}
    			} catch (SQLException e) {
    				// TODO Auto-generated catch block
    				e.printStackTrace();
    			}finally {			
    				JDBCUtil.close(ps, rs, conn);
    			}
    			return list;
    		}
    }
    

      /class StudentService

    package com.neusoft.service;
    
    import java.util.List;
    
    import com.neusoft.bean.Page;
    import com.neusoft.bean.Student;
    import com.neusoft.dao.StudentDao;
    
    public class StudentService {
        private StudentDao stuDao=new StudentDao();
        public Page<Student> getStudentList(int pageNo, int pageSize){
        	//第一步:查询当前表的所有记录数
        			int totalRecord=  stuDao.getTotalRecord();
        			//第二步:创建page对象
        			Page<Student> page = new Page<Student>(totalRecord,pageNo,pageSize);
        			//第三步:查询分页列表数据并设置到page对象中!
        			List<Student> list = stuDao.getLimitStuList(page.getIndex(),page.getPageSize());
        			page.setData(list);
        		
        			return page;
        }
        public List<Student> getStudent(Student student){
        	return stuDao.getStudent(student);
        }
    	public Student getStuInfoById(String id) {
    		// TODO Auto-generated method stub
    		return stuDao.getStuInfoById(id);
    	}
    	public int Add(Student student){
    		return stuDao.add(student);
    	}
    	public int Update(Student student){
    		return stuDao.update(student);
    	}
    }
    

      /class BaseServlet

    package com.neusoft.servlet;
    
    
    import java.io.IOException;
    import java.lang.reflect.InvocationTargetException;
    import java.lang.reflect.Method;
    
    import javax.servlet.ServletException;
    import javax.servlet.annotation.WebServlet;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    /**
     * Servlet implementation class BaseServlet
     */
    @WebServlet("/BaseServlet")
    public class BaseServlet extends HttpServlet {
    	private static final long serialVersionUID = 1L;
    	protected static int pageSize=1;
    	protected static int pageNo=1;
           
    
    	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {	
    		request.setCharacterEncoding("utf8");
    		try {
    			pageNo =Integer.parseInt(request.getParameter("pageNo"));
    		} catch (Exception e) {
    			e.getMessage();
    		}
    		
    		//获取用户传递的请求参数
    		String methodName = request.getParameter("method");
    		//通过方法名获取到方法的对象
    		//获取当前类的Class对象
    		Class<? extends BaseServlet> cla = this.getClass();
    		//获取cla的的方法(Method对象)
    		//getDeclaredMethod需要两个参数,方法名和参数名
    		//因为在java需要通过方法名和参数列表来确定一个方法
    		try {
    			//获取方法对象
    			Method method = cla.getDeclaredMethod(methodName, HttpServletRequest.class , HttpServletResponse.class);
    			//设置方法的访问权限
    			method.setAccessible(true);
    			//调用方法
    			//invoke用于调用一个方法,第一个参数时要调用方法的对象,剩下是调用方法需要的参数
    			method.invoke(this, request , response);
    		}catch (InvocationTargetException e) {
    			System.out.println("此处接收被调用方法内部未被捕获的异常");
    			e.getMessage();
    	    }catch (Exception e) {
    			e.printStackTrace();
    		}
    	}
    
    	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {	
    		request.setCharacterEncoding("utf8");
    		doGet(request, response);
    		
    	}
    
    }
    

      /class StudentServlet

    package com.neusoft.servlet;
    
    import java.io.IOException;
    import java.util.List;
    
    import javax.servlet.ServletException;
    import javax.servlet.annotation.WebServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    import com.neusoft.bean.Page;
    import com.neusoft.bean.Student;
    import com.neusoft.dao.StudentDao;
    import com.neusoft.service.StudentService;
    import com.neusoft.utils.WEBUtils;
    
    
    
    @WebServlet("/StudentServlet")
    public class StudentServlet extends BaseServlet {
    	private static final long serialVersionUID = 1L;
    	private StudentService stuService=new StudentService();
    	
    	protected void getStuList(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {	
    		String url = WEBUtils.getPath(request);
    		Page<Student> page = stuService.getStudentList(pageNo,pageSize);
    		page.setPath(url);
    		request.setAttribute("page",page);
    		request.getRequestDispatcher("/WEB-INF/view/main.jsp").forward(request, response);
    	}
    	protected void toUpdatePage(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {	
    		String id = request.getParameter("id");
    		Student stu= stuService.getStuInfoById(id);
    		if (stu != null) {
    			request.setAttribute("stu",stu);
    			request.getRequestDispatcher("/WEB-INF/view/update.jsp").forward(request, response);
    		}
    		
    	}
    	protected void Delete(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {	
    		String ids = request.getParameter("id");
    		int id=Integer.parseInt(ids);
    		StudentDao.delete(id);
    		getStuList(request, response);
    		//request.getRequestDispatcher("/WEB-INF/view/main.jsp").forward(request, response);
    	}
    	protected void Update(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {	
    		request.setCharacterEncoding("utf8");
    		String name = request.getParameter("name");
    		String school = request.getParameter("school");
    		String score = request.getParameter("score");
    		int id=Integer.parseInt(request.getParameter("id"));
    		Student student=new Student();
    		student.setName(name);
    		student.setSchool(school);
    		student.setScore(score);
    		student.setId(id);
    		System.out.println(name);
    		stuService.Update(student);		
    //			response.sendRedirect("/Regist-success.html");//重定向
    		getStuList(request, response);
    		
    	}
    	protected void Add(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {	
    		request.setCharacterEncoding("utf8");	
    		String name = request.getParameter("name");
    		String school = request.getParameter("school");
    		String score = request.getParameter("score");
    		Student student=new Student();
    		student.setName(name);
    		student.setSchool(school);
    		student.setScore(score);
    		List<Student> student2 = stuService.getStudent(student);
    		System.out.println(student2.toString());
    		if (student2.isEmpty()) {
    			stuService.Add(student);
    			getStuList(request, response);
    			
    		}else  {
    //			response.sendRedirect("/Regist-success.html");//重定向
    			request.getRequestDispatcher("/WEB-INF/view/insert-error.jsp").forward(request, response);//转发
    		}
    	}
    
    }
    

      /class TOInsert

    package com.neusoft.servlet;
    
    import java.io.IOException;
    import javax.servlet.ServletException;
    import javax.servlet.annotation.WebServlet;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    /**
     * Servlet implementation class TOInsert
     */
    @WebServlet("/TOInsert")
    public class TOInsert extends HttpServlet {
    	private static final long serialVersionUID = 1L;
           
      
    	/**
    	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
    	 */
    	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    		request.getRequestDispatcher("/WEB-INF/view/insert.jsp").forward(request, response);
    	
    	}
    
    	/**
    	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
    	 */
    	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    		// TODO Auto-generated method stub
    		doGet(request, response);
    		request.setCharacterEncoding("utf8");
    	}
    
    }
    

      / class JDBCUtil

    package com.neusoft.utils;
    
    import java.sql.Connection;
    import java.sql.DriverManager;
    import java.sql.PreparedStatement;
    import java.sql.ResultSet;
    import java.sql.SQLException;
    import java.sql.Statement;
    
    public class JDBCUtil {
    	private static String driver="com.mysql.jdbc.Driver";
    	private static String url="jdbc:mysql://localhost:3306/demo";
    	private static String username="root";
    	private static String password="123456";
    	static{
    		
    		try {//加载驱动
    			Class.forName(driver);			
    		} catch (Exception e) {
    			// TODO Auto-generated catch block
    			e.printStackTrace();
    		}
    		
    	}
    	public static Connection getConnection(){//创建连接
    			try {
    				return DriverManager.getConnection(url, username, password);
    			} catch (SQLException e) {
    				// TODO Auto-generated catch block
    				return null;
    			}
    		}
    	
    	public static void close(Statement st,ResultSet rs,Connection conn){//全部关闭
    		if (conn !=null) {
    			 try {
    				conn.close();
    			} catch (SQLException e) {
    				// TODO Auto-generated catch block
    				e.printStackTrace();
    			}
    		}
    		if (rs !=null) {
    			try {
    				rs.close();
    			} catch (SQLException e) {
    				// TODO Auto-generated catch block
    				e.printStackTrace();
    			}
    		}
    		if (st !=null) {
    			try {
    				st.close();
    			} catch (SQLException e) {
    				// TODO Auto-generated catch block
    				e.printStackTrace();
    			}
    		}
    	}
    	public static void close(Connection conn){
    		try {
    			conn.close();
    		} catch (SQLException e) {
    			// TODO Auto-generated catch block
    			e.printStackTrace();
    		}
    		
    	}
    	public static void close(PreparedStatement ps){
    		try {
    			ps.close();
    		} catch (SQLException e) {
    			// TODO Auto-generated catch block
    			e.printStackTrace();
    		}
    		
    	}
    	public static void close(ResultSet rs){
    		try {
    			rs.close();
    		} catch (SQLException e) {
    			// TODO Auto-generated catch block
    			e.printStackTrace();
    		}
    		
    	}
    	
    	//封装函数,直接传参使用
    	public static int executeUpdate(String sql,Object... papram) {
    		// TODO Auto-generated method stub
    		Connection conn =getConnection();
    		int result=0;
    		try {
    			PreparedStatement pst = conn.prepareStatement(sql);
    			if (papram!=null) {
    				for (int i = 0; i < papram.length; i++) {
    					pst.setObject(i+1, papram[i]);
    				}
    			}
    			result =pst.executeUpdate();
    		} catch (SQLException e) {
    			// TODO Auto-generated catch block
    			e.printStackTrace();
    		}finally {
    			close(conn);
    		}
    		return result;
    
    	}
    }
    

      /class WEBUtils

    package com.neusoft.utils;
    
    import javax.servlet.http.HttpServletRequest;
    
    public class WEBUtils {
    	public static String getPath(HttpServletRequest request){
    		String requestURI = request.getRequestURI();
    		String queryString = request.getQueryString();
    		String url = requestURI+"?"+queryString;
    		if(url.contains("&pageNo")){
    			url = url.substring(0, url.indexOf("&pageNo"));
    		}
    		if(url.contains("Update")){
    			url = url.replace("Update", "getStuList");
    		}
    		if(url.contains("Add")){
    			url = url.replace("Add", "getStuList");
    		}
    		if(url.contains("Delete")){
    			url = url.replace("Delete", "getStuList");
    		}
    		return url;
    	}
    }
    

      index.jsp

    <%@ page language="java" contentType="text/html; charset=UTF-8"
        pageEncoding="UTF-8"%>
    <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
    <html>
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>Insert title here</title>
    </head>
    <body>
      <a href="${pageContext.request.contextPath}/StudentServlet?method=getStuList&pageNo=1">go!</a>
    </body>
    </html>
    View Code

    main.jsp

    <%@taglib  prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
    <%@ page language="java" contentType="text/html; charset=UTF-8"
        pageEncoding="UTF-8"%>
     
    <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
    <html>
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>Insert title here</title>
    <script type="text/javascript" src="${pageContext.request.contextPath}/js/jquery.min.js"></script>
    </head>
    <body>
    
        <table border="1" align="center" width="50%">
          <tr>
            <th>姓名</th>
            <th>学校</th>
            <th>成绩</th>
            <th colspan="2">操作</th>
          </tr>
          <c:forEach items="${page.data}" var="stu">
          <tr>
            <td>${stu.name}</td>
            <td>${stu.school}</td>
            <td>${stu.score}</td>
            <td> <a href="${pageContext.request.contextPath}/StudentServlet?method=toUpdatePage&id=${stu.id}">修改</a></td><!-- TOUpdate?id=${ stu.id}&name=${stu.name}&school=${stu.school}&score=${stu.score}之前用的方法 -->
            <td> <a href="${pageContext.request.contextPath}/StudentServlet?method=Delete&id=${stu.id}">删除</a></td>
          </tr>
          </c:forEach>
          <tr><td colspan="3" align="center"><a href="/Student-Sql/TOInsert">添加</a></td></tr>
        </table>   
        <br> 
        <%@ include file="/WEB-INF/view/paging.jsp" %>
    </body>
    </html>
    View Code

    insert.jsp

    <%@ page language="java" contentType="text/html; charset=UTF-8"
        pageEncoding="UTF-8"%>
    <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
    <html>
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>Insert title here</title>
    </head>
    <body>
       <form action="${pageContext.request.contextPath}/StudentServlet?method=Add" method="post">
                       姓名:<input type="text" name="name"/><br>
                       学校:<input type="text" name="school"/><br>
                        分数:<input type="text" name="score"/><br>
           <input type="submit" value="添加信息"/>
       </form>
    </body>
    </html>
    View Code

    update.jsp

    <%@ page language="java" contentType="text/html; charset=UTF-8"
        pageEncoding="UTF-8"%>
    <%@taglib  prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
    <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
    <html>
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>Insert title here</title>
    </head>
    <body>
        <%-- <table border="1" align="center" width="50%" >
          <tr>
            <th>原信息</th>
            <th>新信息</th>        
          </tr>
          <c:forEach items="${student2}" var="stu">
          <form action="/Student-Sql/UpdateServlet?id=${stu.id}" method="post">
          <tr>
            <td>${stu.id}</td>
            <td>ID:${stu.id}</td>
          </tr>
           </c:forEach>
            <c:forEach items="${student2}" var="stu">
          <tr>
          
            <td>${stu.name}</td>
            <td>姓名:<input type="text" name="name"/></td>
          </tr>
          </c:forEach>
          <c:forEach items="${student2}" var="stu">
          <tr>       
            <td>${stu.school}</td>
            <td>学校:<input type="text" name="school"/></td>
          </tr>
          </c:forEach>
           <c:forEach items="${student2}" var="stu">
          <tr>
            <td>${stu.score}</td>
            <td>分数:<input type="text" name="score"/></td>
          </tr>      
          <tr><td>&nbsp;</td> <td><input type="submit" value="修改信息 "></td></tr>
        </c:forEach>
        </form>
        </table> --%>
        <form action="${pageContext.request.contextPath}/StudentServlet?method=Update&id=${stu.id}" method="post" >
        <%-- <input type="hidden" name="id" value="${stu.id}"/> --%>
             姓名:<input type="text" name="name" value="${stu.name}"/>
             学校:<input type="text" name="school" value="${stu.school}"/>
             分数:<input type="text" name="score" value="${stu.score}"/>
          <input type="submit" value="修改信息 ">
         </form>
    </body>
    </html>
    View Code

    paging.jsp

    <%@ page language="java" contentType="text/html; charset=UTF-8"
        pageEncoding="UTF-8"%>
    <div id="page_nav" align="center">
        <a href="${page.path}&pageNo=1">首页</a>
        <a href="${page.path}&pageNo=${page.pageNumber -1 }">上一页</a>
            <c:choose>
                <c:when test="${page.totalPage <= 5 }" >
                    <c:set var="begin" value="1"></c:set>
                    <c:set var="end" value="${page.totalPage}"></c:set>
                </c:when>
                <c:when test="${page.pageNumber <= 3 }">
                    <c:set var="begin" value="1"></c:set>
                    <c:set var="end" value="5"></c:set>
                </c:when>
                <c:otherwise>
                    <c:set var="begin" value="${page.pageNumber-2}"></c:set>
                    <c:set var="end" value="${page.pageNumber+2}"></c:set>
                    <c:if test="${end > page.totalPage }">
                        <c:set var="begin" value="${page.totalPage-4}"></c:set>
                        <c:set var="end" value="${page.totalPage}"></c:set>
                    </c:if>
                </c:otherwise>
            </c:choose>
            <c:forEach begin="${begin }" end="${end}" var="num">
                <c:if test="${page.pageNumber == num }">
                    【${num}】
                </c:if>
                <c:if test="${page.pageNumber != num }">
                    <a href="${page.path}&pageNo=${num}">${num }</a>
                </c:if>
            </c:forEach>
        <a href="${page.path}&pageNo=${page.pageNumber +1}">下一页</a>
        <a href="${page.path}&pageNo=${page.totalPage}">末页</a>
        共${page.totalPage }页,${page.totalRecord }条记录到,去第<input value="${page.totalPage }" name = "pn" id ="pn_input"/><input type="button" value="确定" id="btn_id"/>
        <script type="text/javascript">
            $("#btn_id").click(function(){
                var value= $("#pn_input").val();
                window.location="${page.path}&pageNo="+value;
            });
        </script>
    </div>
    View Code

    最后。。导包

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  • 原文地址:https://www.cnblogs.com/lc-java/p/7400357.html
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