IT兄弟連 JavaWeb教程 EL與JSTL表達式經典案例

時間 2019-12-05

原文原文鏈接

案例需求：使用MVC模式編寫一個程序，當發起一個deptList.do請求時，在servlet中準備一個部門列表對象,把這個列表對象放入request做用域中轉發到deptlist.jsp,使用JSTL+EL的語法來顯示這個部門列表。部門類型是XdlDept成員變量有int id、String name、String loc。css

案例實現：html

● XdlDept類：java

package com.xdl.bean;jsp

import java.io.Serializable;ide

public class XdlDept implements Serializable{ui

private static final long serialVersionUID = 1L;this

private int deptno;spa

private String dname;htm

private String loc;對象

@Override

public String toString() {

return "XdlDept [deptno=" + deptno + ", dname=" + dname

+ ", loc=" + loc + "]\n";

}

public XdlDept(int deptno, String dname, String loc) {

super();

this.deptno = deptno;

this.dname = dname;

this.loc = loc;

}

public XdlDept() {

super();

}

public int getDeptno() {

return deptno;

}

public void setDeptno(int deptno) {

this.deptno = deptno;

}

public String getDname() {

return dname;

}

public void setDname(String dname) {

this.dname = dname;

}

public String getLoc() {

return loc;

}

public void setLoc(String loc) {

this.loc = loc;

}

● XdlDeptController類：

package com.xdl.controller;

import java.io.IOException;

import java.util.List;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import com.xdl.bean.XdlDept;

import com.xdl.dao.XdlDeptDAO;

import com.xdl.dao.impl.XdlDeptDAOOracleImp;

@WebServlet("/deptList.do")

public class XdlDeptController extends HttpServlet {

private static final long serialVersionUID = 1L;

protected void service(HttpServletRequest request,

HttpServletResponse response) throws ServletException, IOException {

XdlDeptDAO dao = new XdlDeptDAOOracleImp();

// 經過M層獲取數據

List<XdlDept> depts = dao.getDeptList();

//放入對應的域對象

request.setAttribute("depts", depts);

// 跳轉對應的頁面

request.getRequestDispatcher("deptlist2.jsp").

forward(request, response);

}

● deptList.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>

<title>Insert title here</title>

table {

width:600px;

text-align: center;

border-collapse: collapse;

}

table,tr,td{

border:1px solid red;

}

</style>

</head>

<body>

<table>

<tr> <td>DEPTNO</td> <td> DNAME</td> <td> LOC</td> </tr>

<c:forEach items="${depts}" var="dept" >

<tr> <td>${dept.deptno }</td> <td> ${dept.dname }</td>

</c:forEach>

</table>

</body>

</html>

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