JSP介绍和实践说明

package edu.fjnu.controller;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import edu.fjnu.domain.Student;
import edu.fjnu.service.StudentService;
import edu.fjnu.service.StudentServiceImpl;

public class StudentMgrServlet extends HttpServlet {

    /**
     * Constructor of the object.
     */
    public StudentMgrServlet() {
        super();
    }

    /**
     * The doGet method of the servlet. <br>
     *
     * This method is called when a form has its tag value method equals to get.
     * 
     * @param request the request send by the client to the server
     * @param response the response send by the server to the client
     * @throws ServletException if an error occurred
     * @throws IOException if an error occurred
     */
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        
        request.setCharacterEncoding("utf-8");
        int stuCnt = Integer.parseInt(request.getParameter("stucnt"));

        StudentService stuService = new StudentServiceImpl();
        List<Student> stuList = stuService.loadStus(stuCnt);
        
        request.setAttribute("stus", stuList);
        request.getRequestDispatcher("list_student.jsp").forward(request, response);
        
//        for(Student stu:stuList)
//            System.out.println(stu);
    }

    /**
     * The doPost method of the servlet. <br>
     *
     * This method is called when a form has its tag value method equals to post.
     * 
     * @param request the request send by the client to the server
     * @param response the response send by the server to the client
     * @throws ServletException if an error occurred
     * @throws IOException if an error occurred
     */
    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        doGet(request, response);
    }

}

/**
 * 
 */
package edu.fjnu.domain;

/**
 * @author Administrator
 *
 */
public class Student {
    private Integer stuNO;
    private String stuName;
    private Integer stuAge;
    /**
     * @return the stuNO
     */
    public Integer getStuNO() {
        return stuNO;
    }
    /**
     * @param stuNO the stuNO to set
     */
    public void setStuNO(Integer stuNO) {
        this.stuNO = stuNO;
    }
    /**
     * @return the stuName
     */
    public String getStuName() {
        return stuName;
    }
    /**
     * @param stuName the stuName to set
     */
    public void setStuName(String stuName) {
        this.stuName = stuName;
    }
    /**
     * @return the stuAge
     */
    public Integer getStuAge() {
        return stuAge;
    }
    /**
     * @param stuAge the stuAge to set
     */
    public void setStuAge(Integer stuAge) {
        this.stuAge = stuAge;
    }
    /* (non-Javadoc)
     * @see java.lang.Object#toString()
     */
    @Override
    public String toString() {
        return "Student [stuNO=" + stuNO + ", stuName=" + stuName + ", stuAge="
                + stuAge + "]";
    }
    
    
}

/**
 * 
 */
package edu.fjnu.service;

import java.util.List;

import edu.fjnu.domain.Student;



/**
 * @author Administrator
 *
 */
public interface StudentService {
    List<Student> loadStus(int stuCnt);
}

/**
 * 
 */
package edu.fjnu.service;

import java.util.ArrayList;
import java.util.List;
import java.util.Random;

import edu.fjnu.domain.Student;

/**
 * @author Administrator
 *
 */
public class StudentServiceImpl implements StudentService {

    /* (non-Javadoc)
     * @see edu.fjnu.service.StudentService#loadall()
     */
    @Override
    public List<Student> loadStus(int stuCnt) {
        Random r = new Random();
        List<Student> stuList = new ArrayList<Student>();
        
        for(int i=0;i<stuCnt;i++){
            Student stu = new Student();
            stu.setStuNO(r.nextInt(3000));
            stu.setStuName("mary"+r.nextInt(100));
            stu.setStuAge(r.nextInt(50));
            stuList.add(stu);
        }
        return stuList;
    }

}

/**
 * 
 */
package edu.fjnu.test;

import java.util.List;

import edu.fjnu.domain.Student;
import edu.fjnu.service.StudentService;
import edu.fjnu.service.StudentServiceImpl;

/**
 * @author Administrator
 *
 */
public class StudentTester {

    /**
     * @param args
     */
    public static void main(String[] args) {
        StudentService stuService = new StudentServiceImpl();
        List<Student> stuList = stuService.loadStus(30);
        
        for(Student stu:stuList)
            System.out.println(stu);

    }

}

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
  <display-name>JspWorkPrj</display-name>
  <servlet>
    <servlet-name>StudentMgrServlet</servlet-name>
    <servlet-class>edu.fjnu.controller.StudentMgrServlet</servlet-class>
  </servlet>

  <servlet-mapping>
    <servlet-name>StudentMgrServlet</servlet-name>
    <url-pattern>/stuMgr</url-pattern>
  </servlet-mapping>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
</web-app>

<!DOCTYPE html>
<html>
  <head>
    <title>index.html</title>
    <meta charset="utf-8">
    <meta name="keywords" content="keyword1,keyword2,keyword3">
    <meta name="description" content="this is my page">
    <meta name="content-type" content="text/html; charset=UTF-8">
    
    <!--<link rel="stylesheet" type="text/css" href="./styles.css">-->

  </head>
  
  <body>
    <h3>请输入要生成的学生数量 </h3>
    <form action="stuMgr" method="post">
        <div>
        <span>学生数量</span>
        <input type = "text" name = "stucnt">
        </div>
        <div>
        <input type = "submit" value = "提交">
        </div>
    </form>
  </body>
</html>

<%@ page language="java" import="java.util.*,edu.fjnu.domain.Student" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

List<Student> stuList =(List<Student>)request.getAttribute("stus");
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'list_student.jsp' starting page</title>
    <meta charset="utf-8">
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">    
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->
<style>
    table{
        width:50%;
        margin:10px auto; 
    }
    
    th,td{
        text-align:center;
    }


</style>

<script>
    function removeRow(tableRow,stuName){
        if(confirm("您确定要删除学生"+stuName+" 的记录吗？"))
        tableRow.parentNode.deleteRow(tableRow.rowIndex); 
    
    }

</script>
  </head>
  
  <body>
   <h3>学生名单如下：(共计<%=stuList.size()%>人)</h3>
   <hr>
   
   <table border="1" cellspacing="0">
   <tr>
       <th>学号</th>
       <th>姓名</th>
       <th>年龄</th>
       <th>操作</th>
   </tr>
   <%for(Student stu:stuList){%>
   <tr>
       <td><%=stu.getStuNO()%></td>
       <td><%=stu.getStuName()%></td>
       <td><%=stu.getStuAge()%></td>
       <td>
       <button>修改</button>
       <button onclick="removeRow(this.parentNode.parentNode,'<%=stu.getStuName()%> ');">删除</button>
       </td>
   </tr>
   <%} %>
   </table>
  </body>
</html>