java web 三层架构 oracle 实现学生管理系统

╰+哭是因爲堅強的太久メ 2023-08-17 17:13 119阅读 0赞

最近在看网易云课颜群的java web课程 做一些总结

首先看一下结构：

**java 部分**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyMTM5ODg5_size_16_color_FFFFFF_t_70][]

**jsp部分**

![20190930172944266.png][]

DBUtil.java  这一部分主要是放置了连接数据库的一些通用方法。

package oge.student.util;
    
    import java.sql.Connection;
    import java.sql.DriverManager;
    import java.sql.PreparedStatement;
    import java.sql.ResultSet;
    import java.sql.SQLException;
    import java.sql.Statement;
    import java.util.ArrayList;
    import java.util.List;
    
    import javax.swing.text.html.HTMLDocument.HTMLReader.PreAction;
    
    import org.student.entity.Student;
    
    import com.sun.corba.se.spi.orbutil.fsm.State;
    
    //数据库帮助类
    public  class  DBUtil{
    	 private static final String URL="jdbc:oracle:thin:@localhost:1521:orcl";
    	 private static final String USERNAME="sys as sysdba";
    	 private static final String PASSWORD="123456";	
    public	 static	 Connection connection= null;
    public	 static	 PreparedStatement pstmt=null;
    	 static	ResultSet rs;
    	//查询总人数
    	 public static int getTotalCount(String sql) {
    		 int count=-1;
    		 try {
    			 
    		pstmt=	createPreparedStatement(sql, null);
    			rs = pstmt.executeQuery();
    		if(rs.next()) {	
    			count = rs.getInt(1);
    			
    		}
    		} catch (ClassNotFoundException | SQLException e) {
    			// TODO Auto-generated catch block
    			e.printStackTrace();
    		}catch (Exception e) {
    			// TODO Auto-generated catch block
    			e.printStackTrace();
    		}
    		 
    		 finally {
    			closeAll(rs, pstmt, connection);
    		}
    		 return count;
    		 
    	 }
    	 
    	 //获取Connection
    	 
    public static Connection getConnection() throws ClassNotFoundException, SQLException {
    		 Class.forName("oracle.jdbc.OracleDriver");
    		return DriverManager.getConnection(URL,USERNAME,PASSWORD);
    	 }
           //获取pstmt
    public static PreparedStatement createPreparedStatement(String sql,Object[] params) throws ClassNotFoundException, SQLException {
    		 pstmt= getConnection().prepareStatement(sql);
    		//pstmt.setInt(1, sno);
    		if(params!=null) {
    		for(int i=0;i<params.length;i++) {
    			pstmt.setObject(i+1, params[i]);
    		}}
    		return pstmt;
    	 }
    	 
    public static  boolean executeupdate(String sql, Object[] params) {
    	
    try {
    	 
    //String sql="delete from student where sno = ?";
    	pstmt =createPreparedStatement(sql,params);
    int count =	pstmt.executeUpdate();
    if(count>0) 
    	return true;
    else 
    	return false;
    
    
    }catch (ClassNotFoundException e) {
    	// TODO Auto-generated catch block
    	e.printStackTrace();	
    	 return false;
    
    } catch (SQLException e) {
    	// TODO Auto-generated catch block
    	e.printStackTrace();
    	 return false;
    
    }catch (Exception e) {
    	// TODO Auto-generated catch block
    	e.printStackTrace();
    	 return false;
    	
    }
    finally {
    //	closeAll(null,pstmt,connection);
    }
    }
    
    public static  ResultSet executeQuery(String sql,Object[]params ) {
    	
    	List<Student> students= new ArrayList<>();
    
    
    	Student student =null;
    	try {
    	
    	//String sql="select * from student ";
    
    	pstmt= createPreparedStatement(sql, params);
    	 rs = pstmt.executeQuery();
    
    	return rs;	
    		
    		
    	} catch (ClassNotFoundException e) {
    		// TODO Auto-generated catch block
    		e.printStackTrace();	
    		return null;
    	} catch (SQLException e) {
    		// TODO Auto-generated catch block
    		e.printStackTrace();
    		return null;
    	}catch (Exception e) {
    		// TODO Auto-generated catch block
    		e.printStackTrace();
    		return null;
    	}
    
    	
    };
    	
    public static void closeAll(ResultSet rs,Statement stmt,Connection connection) {
    	try {
            if(rs!=null)rs.close();
    		if(pstmt!=null)pstmt.close();
    		if(connection!=null)connection.close();
    		
    	} catch (SQLException e) {
    		// TODO Auto-generated catch block
    		e.printStackTrace();
    	}
    	catch (Exception e) {
    		// TODO Auto-generated catch block
    		e.printStackTrace();
    	   } 
        }
    }

IStudentDao 下面写Dao的接口

package org.student.dao;
    
    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;
    
    import org.student.entity.Student;
    
    public interface IStudentDao {
    	 
    	 
    public boolean isExist(int sno);
    	
    public int getTotalCount();
    //int currentPage 页码    pageSize数据条数
    public List<Student> queryStudentsByPage(int currentPage,int pageSize);
    
    public boolean addStudent(Student student);
    		
    		
    public boolean deleteStudentBySno(int sno);
    
    
    public boolean  updateStudentBySno(int sno, Student student) ;
    
    public List<Student> queryAll();
    
    public Student queryStudentBysno(int sno);
    }

StudentDaoImpl.java

package org.student.dao.impl;
    
    import java.sql.*;
    import java.util.ArrayList;
    import java.util.List;
    
    import org.student.dao.IStudentDao;
    import org.student.entity.Student;
    
    import oge.student.util.DBUtil;
    import sun.security.pkcs11.Secmod.DbMode;
    
    public class StudentDaoImpl implements IStudentDao{
    	 private final String URL="jdbc:oracle:thin:@localhost:1521:orcl";
    			 private final String USERNAME="sys as sysdba";
    			 private final String PASSWORD="123456";	
    			 
    				
    				PreparedStatement pstmt=null;
    				ResultSet rs=null;
    				Student student =null;
    			 
    public boolean isExist(int sno) {	
    		
    		    return queryStudentBysno(sno)==null?false:true; 
    	}
    			 
    	
    public boolean addStudent(Student student) {
        String sql="insert into student values(?,?,?,?)";
    	Object[] params= {student.getSno(),student.getSname(),student.getSage(),student.getSaddress()};
        return 	DBUtil.executeupdate(sql, params);
    
    }
    		
    public boolean deleteStudentBySno(int sno) {
    	
    	String sql="delete from student where sno = ?";
    	Object[] params= {sno};
    	  return 	DBUtil.executeupdate(sql, params);
    	
    }
    
    public boolean  updateStudentBySno(int sno, Student student) {
    	
    	String sql="update student set sname=?,sage=?,saddress=? where sno=?";
    	Object[] params= {student.getSname(),student.getSage(),student.getSaddress(),sno};
        return 	DBUtil.executeupdate(sql, params); 
    }
    	
    
    public List<Student>  queryAll() {
    	PreparedStatement pstmt=null;
    	Student student =null;
    	List<Student> students= new ArrayList<>();
    
    	try {
    	String sql="select * from student ";
        rs = DBUtil.executeQuery(sql, null);
      
      
    	// rs = pstmt.executeQuery();	
    		while(rs.next()) {
    		int no=	rs.getInt("sno");
    		String name=	rs.getString("sname");
    		int age=	rs.getInt("sage");
          	String address=	rs.getString("saddress");
          	student= new Student(no,name,age,address);
          	students.add(student);
    		}
    	return students;	
    		
    		
    	} 
       catch (SQLException e) {
    		// TODO Auto-generated catch block
    		e.printStackTrace();
    		return null;
    	}catch (Exception e) {
    		// TODO Auto-generated catch block
    		e.printStackTrace();
    		return null;
    	}
    	finally {
    		try { 
    			if(rs!=null)rs.close();
    			if(pstmt!=null)pstmt.close();
    			if(DBUtil.connection!=null)DBUtil. connection.close();
    			
    		} catch (SQLException e) {
    			// TODO Auto-generated catch block
    			e.printStackTrace();
    		}
    		catch (Exception e) {
    			// TODO Auto-generated catch block
    			e.printStackTrace();
    		}
    	}
    	
    };
    
    public Student queryStudentBysno(int sno) {
    	
    		try {
    			
    			
    		String sql ="select * from student where sno=?";
    		Object[] params= {sno};
    		rs = DBUtil.executeQuery(sql, params);     
    		//rs= pstmt.executeQuery();
    		if(rs.next()) {
    			int no=	rs.getInt("sno");
    			String name=	rs.getString("sname");
    			int age=	rs.getInt("sage");
    	      	String address=	rs.getString("saddress");
    	      	student= new Student(no,name,age,address);
    			}
    		return student;	
    			
    			
    		
    		
    		
    		
    		} 
    		catch (SQLException e) {
    			// TODO Auto-generated catch block
    			e.printStackTrace();
    			return null;
    		}catch (Exception e) {
    			// TODO Auto-generated catch block
    			e.printStackTrace();
    			return null;
    		}
    		finally {
    		DBUtil.	closeAll(rs,pstmt,DBUtil. connection);
    		}
    		
    	}
    
    
    @Override
    public int getTotalCount() {
     
    String sql="select count(1) from student";	
    	
    	return DBUtil.getTotalCount(sql);
    }
    
    
    @Override
    public List<Student> queryStudentsByPage(int currentPage, int pageSize) {
    String sql="select * from"
            +"("
    		+ " select rownum r,t.* from "
    		+ "(select s.* from student s order by sno asc)t "
    		+ "where rownum<=?"
    		+ ")"
    		+ "where r>=?";
    Object[] params= { currentPage*pageSize,(currentPage-1)*pageSize+1 };
    
    List<Student> students= new ArrayList<>();
    ResultSet rs= DBUtil.executeQuery(sql,params);  
     
    try {
    	while(rs.next()){
    		Student student = new Student(rs.getInt("sno"),rs.getString("sname"),
    		rs.getInt("sage"),
    		rs.getString("saddress"));
    		students.add(student);
    		
    	
    	}
    } catch (SQLException e) {
    	// TODO Auto-generated catch block
    	e.printStackTrace();
    } catch (Exception e) {
    	// TODO Auto-generated catch block
    	e.printStackTrace();
    }
    	 
    	 
    	return students;
    }
    
    
    
    
    }

Page.java  写分页

package org.student.entity;
    
    import java.util.List;
    
    public class Page {
    
    	private int currentPage;
    	
    	private int pageSize;
    	
    	private int totalCount;
    	
    	private int totalPage;
    	
    	private List<Student> students;
    
    	
    	public Page() {
    	
    	}
    
    	public Page(int currentPage, int pageSize, int totalCount, int totalPage, List<Student> students) {
    		super();
    		this.currentPage = currentPage;
    		this.pageSize = pageSize;
    		this.totalCount = totalCount;
    		this.totalPage = totalPage;
    		this.students = students;
    	}
    
    	public int getCurrentPage() {
    		return currentPage;
    	}
    
    	public void setCurrentPage(int currentPage) {
    		this.currentPage = currentPage;
    	}
    
    	public int getPageSize() {
    		
    		return pageSize;
    	}
    
    	public void setPageSize(int pageSize) {
    		this.pageSize = pageSize;
    		this.totalPage= this.totalCount%this.pageSize==0?this.totalCount/this.pageSize:(this.totalCount/this.pageSize)+1;
    		this.pageSize = pageSize;
    	}
    
    	public int getTotalCount() {
    		return totalCount;
    	}
    
    	public void setTotalCount(int totalCount) {
    		this.totalCount = totalCount;
    	}
    
    	public int getTotalPage() {
    		return totalPage;
    	}
    
    	//
    	
    	//public void setTotalPage(int totalPage) {
    	//	this.totalPage = totalPage;
    	//}
    
    	public List<Student> getStudents() {
    		return students;
    	}
    
    	public void setStudents(List<Student> students) {
    		this.students = students;
    	}
    	
    	
    	
    }

Student 类 封装成javabean

package org.student.entity;
    
    public class Student {
    	
    	private int sno;
    	private String sname;
    	private int sage;
    	private String saddress;
    	
    	public Student() {};
    	
    	public Student(int sno, String sname, int sage, String saddress) {
    		super();
    		this.sno = sno;
    		this.sname = sname;
    		this.sage = sage;
    		this.saddress = saddress;
    	}
    
    	public Student( String sname, int sage, String saddress) {
    		super();
    		this.sname = sname;
    		this.sage = sage;
    		this.saddress = saddress;
    	}
    	
    	
    	public int getSno() {
    		return sno;
    	}
    	public void setSno(int sno) {
    		this.sno = sno;
    	}
    	public String getSname() {
    		return sname;
    	}
    	public void setSname(String sname) {
    		this.sname = sname;
    	}
    	public int getSage() {
    		return sage;
    	}
    	public void setSage(int sage) {
    		this.sage = sage;
    	}
    	public String getSaddress() {
    		return saddress;
    	}
    	public void setSaddress(String saddress) {
    		this.saddress = saddress;
    	}
    	
    	public  String  toString() {
    		return  this.getSno()+"-"+this.getSname()+"-"+this.getSage()+"-"+this.getSaddress();
    		
    	}
    
    }

IStudentService.java    服务层接口

package org.student.service;
    
    import java.util.List;
    
    import org.student.entity.Student;
    
    public interface IStudentService {
    public boolean addStudent(Student student) ;
    public boolean deleteStudentBySno(int sno);
    public boolean updateStudentBySno(int sno ,Student student) ;
    public List<Student> queryAllStudents();
    public Student queryStudentBySno(int  sno) ;
    
    public List<Student> queryStudentByPage(int currentPage , int pageSize);
    public int getTotalCount();
    }

StudentServiceImpl.java  实现

package org.student.service.impl;
    
    import java.util.List;
    
    import org.student.dao.IStudentDao;
    import org.student.dao.impl.StudentDaoImpl;
    import org.student.entity.Student;
    import org.student.service.IStudentService;
    
    //业务逻辑层
    public class StudentServiceImpl implements IStudentService {
    	IStudentDao  studentDao =new StudentDaoImpl();
    	public boolean addStudent(Student student) {
    		
    		if(!studentDao.isExist(student.getSno())){
    			studentDao.addStudent(student); 
    			return true;
    		}
    		else {
    			System.out.println("此人已经存在");
    			return false;
    		}
    	}
    	
    public boolean deleteStudentBySno(int sno) {
    		if(studentDao.isExist(sno)) {
    			return 	studentDao.deleteStudentBySno(sno);
    		
    		}
    		return false;
    	}
    	
    public boolean updateStudentBySno(int sno ,Student student) {
    
    	if(studentDao.isExist(sno)) {
    		studentDao.updateStudentBySno(sno, student);
    		System.out.println("修改成功");
    		return true;
    	}
    	else {
    		System.out.println("修改失败");
    	return false;
    		
    	}
    	
    }
    
    public Student queryStudentBySno(int  sno) {
      return  studentDao.queryStudentBysno(sno);
     
    }
    
    
    public List<Student> queryAllStudents() {
    
      return  studentDao.queryAll();
     
    }
    
    @Override
    public List<Student> queryStudentByPage(int currentPage, int pageSize) {
         
    	return studentDao.queryStudentsByPage(currentPage, pageSize);
    }
    
    @Override
    public int getTotalCount() {
    	// TODO Auto-generated method stub
    	return studentDao.getTotalCount() ;
    }
    	
    
    }

AddStudentServlet   Servlet层  增加信息操作

package org.student.servlet;
    
    import java.io.IOException;
    import java.io.PrintWriter;
    
    import javax.servlet.ServletException;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    import org.student.entity.Student;
    import org.student.service.IStudentService;
    import org.student.service.impl.StudentServiceImpl;
    
    public class AddStudentServlet extends HttpServlet {
    	
    	private PrintWriter writer;
    
    
    	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    		
    		int sno=Integer.parseInt(request.getParameter("sno"));
    		String name=request.getParameter("sname");
         	int age=Integer.parseInt(request.getParameter("sage"));
    		String address = request.getParameter("saddress");	
    		Student student =new Student(sno,name,age,address);	
    		
    		IStudentService studentService = new StudentServiceImpl();
    		boolean result= studentService.addStudent(student);
    		
    		 response.setContentType("text/html; charset=UTF-8");
    		 response.setCharacterEncoding("utf-8");
    		 
    		 
    		 PrintWriter out = response.getWriter();
    		
    		if(result) {
    		  request.setAttribute("error", "success");
    		  out.print("添加成功");
    		//  response.sendRedirect("QueryAllStudentServlet");	
    		}
    		else {
    			request.setAttribute("error","addError"); // 增加失败
    			
    		 /// response.sendRedirect("QueryAllStudentServlet");	
    			//request.getRequestDispatcher("QueryAllStudentServlet").forward(request, response);
    		}
    		request.getRequestDispatcher("QueryStudentByPage").forward(request, response);
    		
    	} 
    
    	
    	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    		
    		doGet(request, response);
    	}
    
    }

DeleteStudentServlet.java

package org.student.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 org.student.service.IStudentService;
    import org.student.service.impl.StudentServiceImpl;
    
    public class DeleteStudentServlet extends HttpServlet {
    
          
    
    	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    		request.setCharacterEncoding("utf-8");
    		
    		int  no = Integer.parseInt(request.getParameter("sno"));
        
    
    		IStudentService service = new StudentServiceImpl();
    		boolean result = service.deleteStudentBySno(no);
    		
    		 response.setContentType("text/html; charset=UTF-8");
    		 response.setCharacterEncoding("utf-8"); 
    		
    		if(result) {
    			response.getWriter().print("删除成功");
    			response.sendRedirect("QueryStudentByPage");
    		}	
    		else {
    			response.getWriter().print("删除失败");
    		}
    		}
    
    	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    
    		doGet(request, response);
    	}
    
    }

QueryStudentByPage.java  分页并显示数据

package org.student.servlet;
    
    import java.io.IOException;
    import java.util.List;
    
    import javax.servlet.ServletException;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    import org.student.entity.Page;
    import org.student.entity.Student;
    import org.student.service.IStudentService;
    import org.student.service.impl.StudentServiceImpl;
    
    
    public class QueryStudentByPage extends HttpServlet {
    
    	
    	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        IStudentService studentService = new StudentServiceImpl();
        
        int  totalCount =studentService.getTotalCount();
        
       Page page= new Page();
      
    	
    	page.setTotalCount(totalCount);
    	
    	
       String cPage=  request.getParameter("currentPage");
      
        if(cPage==null) {
        	
        	cPage="1";
        }
        Integer currentPage= Integer.parseInt(cPage);
        page.setCurrentPage(currentPage);
        int pageSize=3;
        page.setPageSize(pageSize);
        
        
     List<Student> students= studentService.queryStudentByPage(currentPage, pageSize);
    		
    		page.setStudents(students);
    					
    
    		request.setAttribute("p", page);
    		//page.getStudents();
    		request.getRequestDispatcher("index.jsp").forward(request, response);
    		
    	}
    
    	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    
    		doGet(request, response);
    	}
    
    }

QueryStudentBySnoServlet.java  根据学号查学生 / 方便修改学生信息

package org.student.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 org.student.entity.Student;
    import org.student.service.IStudentService;
    import org.student.service.impl.StudentServiceImpl;
    
    
    public class QueryStudentBySnoServlet extends HttpServlet {
    	
           
    
    	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    		
    		request.setCharacterEncoding("utf-8");
    		int  no = Integer.parseInt(request.getParameter("sno"));
    		IStudentService service = new StudentServiceImpl();
    		Student student = service.queryStudentBySno(no);
    		
          	request.setAttribute("student",student) ;	
          	request.getRequestDispatcher("StudentInfo.jsp").forward(request, response);
    
    		
    	
    	}
     
    	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    	
    		doGet(request, response);
    	}
    
    }

UpdateStudentBySnoServlet.java  更新操作

package org.student.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 org.student.entity.Student;
    import org.student.service.IStudentService;
    import org.student.service.impl.StudentServiceImpl;
    
    
    public class UpdateStudentBySnoServlet extends HttpServlet {
    
    	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    		
    		request.setCharacterEncoding("utf-8");
    		int no = Integer.parseInt( request.getParameter("sno")) ;
    		
    		 response.setContentType("text/html; charset=UTF-8");
    		 response.setCharacterEncoding("utf-8");
    		 	
    		String name =  request.getParameter("sname");
    		int age = Integer.parseInt( request.getParameter("sage")) ;
    		String address= request.getParameter("saddress");
    		
    		Student student= new Student(name,age,address);
           IStudentService service = new  StudentServiceImpl();
           
         boolean result =  service.updateStudentBySno(no, student);
       	if(result) {
    		response.getWriter().print("修改成功");
    		response.sendRedirect("QueryStudentByPage");
    		
    	}
    	else {
    		response.getWriter().print("修改失败");
    	}	
           
           
    		
    		
    	}
    	
    
    	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    	
    		doGet(request, response);
    	}
    
    }

**add.jsp **

<%@ page language="java" contentType="text/html; charset=UTF-8"
        pageEncoding="UTF-8"%>
    <!DOCTYPE html>
    <html>
    <head>
    <script type="text/javascript" src="js/jquery-3.4.1.js"></script>
    <script type="text/javascript">
    
    
    
    $(document).ready(function(){
    	
    });
    function check(){
    	var sno = $("#sno").val();
    	var sname = $("#sname").val();
    	var sage = $("#sage").val();
    	var saddress = $("#saddress").val();
    	if(sname==null || sname==""){
    		
    		alert("姓名不能为空");
    	return false;
    	}
        if(!(sname.length > 1 && sname.length<5)){
    		
    		alert("姓名有误");
    		return false;
    	}
    	  return true;
    	
    }
    
    
    </script>
    
    <meta charset="UTF-8">
    <title>Insert title here</title>
    </head>
    <body> 
    <form action="AddStudentServlet" method="POST"  >	
       学号：<input type="text" name="sno" id="sno"><br/>
         姓名：<input type="text" name="sname" id="sname"><br/>
        年龄：<input type="text" name="sage" id="sage"><br/>
        地址：<input type="text" name="saddress" id="saddress"><br/>
        <input type="submit" value="提交"  ><br/>
    
    </form>
    </body>
    </html>

index.jsp

<%@page import="org.student.entity.Page"%>
    <%@page import="org.student.entity.Student"%>
    <%@page import="java.util.List"%>
    <%@ page language="java" contentType="text/html; charset=UTF-8"
        pageEncoding="UTF-8"%>
    <!DOCTYPE html>
    <html>
    <head>
    <script type="text/javascript" src="js/jquery-3.4.1.js"></script>
    
    <script type="text/javascript">
    $(document).ready(function(){
    	$("tr:odd").css("background-color","lightgray");
    	 
    
    });
    
    
    </script>
    
    
    <meta charset="UTF-8">
    <title>学生信息</title>
    </head>
    <body>
    
    
    
    
    <% 
    String error = (String)request.getAttribute("error");  
    if(error!=null){
    if(error.equals("addError")){
    	out.print("增加失败");
    }
    	else if(error.equals("success")) out.print("增加成功");}
    
    %>
    
    
    <table  border="1px">
    <tr>
        <th>学号</th>
        <th>姓名</th>
        <th>年龄</th>
        <th>地址</th>
        <th>操作</th>
    </tr>
    <% 
        Page  p =(Page) request.getAttribute("p"); 
         for(Student student:p.getStudents()){
    	%>
    	
    	<tr>
    	<td><a href="QueryStudentBySnoServlet?sno=<%=student.getSno()%>"><%=student.getSno()%></a></td>
    	<td><%=student.getSname()%></td>
    	<td><%=student.getSage()%></td>
    	<td><%=student.getSaddress()%></td>
    	<td><a href="DeleteStudentServlet?sno=<%=student.getSno()%>">删除</a></td>
    	</tr>
    	<%	
    }	
         
    %>
    
    
    </table>
    	<a href="add.jsp">新增</a><br/>
    	
    	
    	<%
    	if(p.getCurrentPage() ==1)
    	{%>
    	
    	
    		<a href="QueryStudentByPage?currentPage=1">	首页</a>
    	   <a href="QueryStudentByPage?currentPage=<%=p.getCurrentPage()+1%>">	下一页</a>
    	   
    <%	}
    	else if(p.getCurrentPage() == p.getTotalPage()){%>
    
        <a href="QueryStudentByPage?currentPage=<%=p.getCurrentPage()-1%>">	上一页</a>
        <a href="QueryStudentByPage?currentPage=1<%=p.getTotalPage() %>">	尾页</a>
        
     <%  }
    else { %>
    	
     <a href="QueryStudentByPage?currentPage=1">	首页</a>
     <a href="QueryStudentByPage?currentPage=<%=p.getCurrentPage()-1%>">	上一页</a>
     <a href="QueryStudentByPage?currentPage=<%=p.getCurrentPage()+1%>">	下一页</a>
     <a href="QueryStudentByPage?currentPage=<%=p.getTotalPage() %>">	尾页</a>
     
    <%	}%>
    	
    
    	
    </body>
    </html>

StudentInfo.jsp

<%@page import="org.student.entity.Student"%>
    <%@ page language="java" contentType="text/html; charset=UTF-8"
        pageEncoding="UTF-8"%>
    <!DOCTYPE html>
    <html>
    <head>
    <meta charset="UTF-8">
    <title>Insert title here</title>
    </head>
    <body>
    <%
     Student student = (Student) request.getAttribute("student");
    %>
    
    
    
    <form action="UpdateStudentBySnoServlet" >
     学号：<input type="text" name="sno" value="<%=student.getSno()%>" readonly="readonly"><br/>
     姓名：<input type="text"  name="sname" value="<%=student.getSname()%>"><br/>
     年龄：<input type="text" name="sage" value="<%=student.getSage()%>"><br/>
     地址：<input type="text" name= "saddress" value="<%=student.getSaddress()%>"><br/>
     <input type="submit" value="修改"/>
     
    <a href="QueryAllStudentServlet">返回</a>
    
    </form>
    
    
    </body>
    </html>

下面是演示视频

![20190930180104271.gif][]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyMTM5ODg5_size_16_color_FFFFFF_t_70]: /images/20230808/cbc0ffd171064f0c80763215018f981a.png
[20190930172944266.png]: /images/20230808/15863d24414342d687024861e6433047.png
[20190930180104271.gif]: /images/20230808/e620c0c6b75d48b6a5f60b473b446846.png