J2EE项目中施用Json格式数据-JavaSript-爱易网页

J2EE项目中施用Json格式数据

日期：2014-05-16　浏览次数：20363 次

J2EE项目中使用Json格式数据
在java中使用json，一共需要引入6个包：
1.json-lib-2.4-jdk15.jar(json包,必须导入)
2.commons-lang 2.5(依赖包,必须导入)
3.commons-beanutils 1.8.0(依赖包,必须导入)
4.commons-collections 3.2.1(依赖包,必须导入)
5.commons-logging 1.1.1(依赖包,必须导入)
6.ezmorph 1.0.6(依赖包,必须导入)
Demo流程：
点击index.jsp页面的"json测试按钮",经jquery调用getJson ajax请求处理到JsonServlet,servlet中调用DeptDAO方法查询dept表中的所有数据,并返回list,在将list封装成json格式数据,最后callback,并在index.jsp页面的相应div中显示数据.
主要代码如下:
1.index.jsp

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

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'index.jsp' starting page</title>
	<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">
	-->
	<script type="text/javascript" src="jquery_lib/jquery-1.6.2.min.js"></script>
	<script type="text/javascript">
		function jsonTest(){
			$.getJSON("<%=request.getContextPath()%>/servlet/JsonServlet",null,callback);
			function callback(data){
				var resultObj = $("#result");
				var showTable="<table>";
				for(i=0;i<data.length;i++){
					showTable+="<tr><td>"+data[i].deptno+"</td>";
					showTable+="<td>"+data[i].dname+"</td>";
					showTable+="<td>"+data[i].loc+"</td></tr>";
				}
				showTable+="</table>";
				resultObj.html(showTable);
			}
		}
	</script>
  </head>
  
  <body>
    <input type="button" value="json测试" onclick="jsonTest()">
    <div id="result"></div>
  </body>
</html>

2.Dept.java(实体类)

package com.czq.entitiy;

public class Dept {
	private String deptno;
	private String dname;
	private String loc;
	public String getDeptno() {
		return deptno;
	}
	public void setDeptno(String 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;
	}
	
}

3.JsonServlet.java

package com.czq.servlet;

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

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

import net.sf.json.JSONArray;

import com.czq.dao.DeptDAO;
import com.czq.entitiy.Dept;

public class JsonServlet extends HttpServlet {

	/**
	 * 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 {

		this.doPost(request, response);
	}

	/**
	 * 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 Servlet

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J2EE项目中施用Json格式数据

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