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jsp相关-jsp2.0表达式

2016-03-23 16:51 645 查看

1、${expression}表达式相当于<jsp:expresion>

利用这个表达式的简单例子如下：

1.1 javabean类

package com.servlet.day03MVC.jsp2;

public class Employee {
private int id;
private String nameString;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getNameString() {
return nameString;
}
public void setNameString(String nameString) {
this.nameString = nameString;
}

}

1.2servlet类：

package com.servlet.day03MVC.jsp2;

import java.io.IOException;

import java.io.PrintWriter;

import java.util.ArrayList;

import java.util.HashMap;

import javax.servlet.RequestDispatcher;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class mvcTestjsp2 extends HttpServlet {

public mvcTestjsp2() {
super();
}

public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
Employee e1=new Employee();
Employee e2=new Employee();
Employee e3=new Employee();
e1.setId(1);
e2.setId(2);
e3.setId(3);
e1.setNameString("map变量作为参数下的雇员张三");
e2.setNameString("map变量作为参数下的雇员李四");
e3.setNameString("map变量作为参数下的雇员王五");

HashMap mymap1=new HashMap();

mymap1.put("e1", e1);

mymap1.put("e2", e2);

mymap1.put("e3", e3);

//单个简单变量jsp2.0表达式的取值

request.setAttribute("e1", "单个变量作为参数下的张三");

//数组变量jsp2.0表达式的取值

String [] nameStrings={"数组作为参数下的张三","数组作为参数下的李四","数组作为参数下的王五"};

request.setAttribute("nameStrings", nameStrings);

//指针变量jsp2.0表达式的取值

ArrayList arrayList=new ArrayList();

arrayList.add("指针作为参数下的张三");

request.setAttribute("arrayList", arrayList);

//map变量jsp2.0表达式的取值

request.setAttribute("mymap1", mymap1);

RequestDispatcher requestDispatcher=request.getRequestDispatcher("/mvcTest/jsp2test.jsp");

requestDispatcher.forward(request, response);

}

public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

doGet(request, response);

}

public void init() throws ServletException {
// Put your code here
}

}

1.3jsp页面处理：

<%@ page language="java" import="java.util.*" 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="tomvcTestjsp2">

<input type="submit" value="查询雇主及雇员信息">

</form>

单个简单变量jsp2.0表达式的取值<br>

<ul>

<li>${e1 }</li>

</ul>

数组变量jsp2.0表达式的取值<br>

<ul>

<li>${nameStrings[0] }</li>

<li>${nameStrings[1] }</li>

<li>${nameStrings[2] }</li>

</ul>

指针变量作为参数jsp2.0表达式的取值<br>

<ul>

<li>${arrayList[0] }</li>

</ul>

MAP变量作为参数jsp2.0表达式的取值<br>

<ul>

<li>${mymap1["e1"].nameString}</li>

<li>${mymap1["e2"].nameString}</li>

<li>${mymap1["e3"].nameString}</li>

</ul>

</body>

</html>

1.4记得要在web.xml页面配置servlet的映射

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标签： servlet mvc jsp

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