JSON实例（AJAX+STRUTS ）
前段时间做项目用到了json，今天我抽时间写了一个struts+ajax+json的例子.个人感觉ajax+json在很大程度上降低了网络和服务器的IO，是一个很不错的组合！
1：json的lib我用的是json-lib-2.1-jdk15.jar，它可以在
2：struts用的是1.2
3：用到了js第三方prototype.js，主要用它包装的ajax对象，大家也没必要用这个，可以直接在js里用XMLHttpRequest。
以下是例子中所用到的相关文件：
Java代码
/////////////////////////////////////// toolhxw.js
/**
@hxw20080602
*/
//回调函数简单回调函数
function showesay(dataResponse)
{
var data = eval('(' + dataResponse.responseText + ')');
var str='';
str+='<ul>';
str+='<li>'+data.param1;+'</li>';
str+='<li>'+data.param2;+'</li>';
str+='</ul>';
document.getElementById("content").innerHTML=str;
}
//回调函数复杂回调函数
function showcomplex(dataResponse)
{
var data = eval('(' + dataResponse.responseText + ')');
var str='';
for(var i=0;i<data.js.length;i++)
{
str+='<ul>';
str+='<li>'+data.js.id+'</li>';
str+='<li>'+data.js.age+'</li>';
str+='<li>'+data.js.name+'</li>';
str+='<li>'+data.js.address+'</li>';
str+='</ul>';
}
document.getElementById("content").innerHTML=str;
}
//获取简单的json数据
function getesay(){
var url = 'test.do';
var pars = 'method=getEasy';
var ajax = new Ajax.Request(
url,
{method:'post',parameters:pars,onComplete:showesay}
);
}
//获取对象级复杂数据
function getcomplex(){
var url = 'test.do';
var pars = 'method=getComplex';
var ajax = new Ajax.Request(
url,
{method:'post',parameters:pars,onComplete:showcomplex}
);
}
///////////////////////////////////////struts-config.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.2//EN" "http://struts.apache.org/dtds/struts-config_1_2.dtd">
<struts-config>
<data-sources />
<form-beans />
<global-exceptions />
<global-forwards />
<action-mappings >
<action path="/test" parameter="method" type="com.json.struts.action.TestAction">
</action>
</action-mappings>
<message-resources parameter="com.json.struts.ApplicationResources" />
</struts-config>
////////////////////////////////TestAction.java
/*
* Generated by MyEclipse Struts
* Template path: templates/java/JavaClass.vtl
*/
package com.json.struts.action;
import java.io.PrintWriter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.actions.DispatchAction;
import net.sf.json.*;
/**
* @author hxw
*
*/
public class TestAction extends DispatchAction {
/**
* 获取简单组合数据
*/
public ActionForward getEasy(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response) {
response.setContentType("text/html; charset=GBK");
try
{
PrintWriter out = response.getWriter();
//这里的数据拼装一般是从数据库查询来的
JSONObject jsonObject = new JSONObject();
jsonObject.put("param1", "变量一");
jsonObject.put("param2", "变量二");
out.print(jsonObject.toString());
out.flush();
out.close();
return null;
}catch(Exception e)
{
e.printStackTrace();
return null;
}
}
/**
* 获取复杂组合数据
*/
public ActionForward getComplex(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response) {
response.setContentType("text/html; charset=GBK");
try
{
PrintWriter out = response.getWriter();
JSONObject obj = new JSONObject();
JSONArray js = new JSONArray();
//这里的数据拼装一般是从数据库查询来的
for(int i=0;i<3;i++)
{
JSONObject objtemp = new JSONObject();
objtemp.put("id", i);
objtemp.put("age", "23");
objtemp.put("name", "test"+i);
objtemp.put("address", "test");
js.add(objtemp);
}
obj.put("js",js);
out.print(obj.toString());
}catch(Exception e)
{
e.printStackTrace();
System.out.print("消费明细json存储异常");
}
return null;
}
}
////////////////////////////test.jsp
<%@ page language="java" import="java.util.*" contentType="text/html;charset=gbk"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>json练习</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">
<script type="text/javascript"src="js/prototype.js"></script>
<script type="text/javascript"src="js/toolhxw.js"></script>
</head>
<body>
<div id="func" >
<a href='javascript:getesay()'>获取简单组合数据</a>
<a href='javascript:getcomplex()'>获取复杂组合数据</a>
</div>
<div id="content">
正在获取内容...
</div>
</body>
</html>
/////////////////////////////////////// toolhxw.js
/**
@hxw20080602
*/
//回调函数简单回调函数
function showesay(dataResponse)
{
var data = eval('(' + dataResponse.responseText + ')');
var str='';
str+='<ul>';
str+='<li>'+data.param1;+'</li>';
str+='<li>'+data.param2;+'</li>';
str+='</ul>';
document.getElementById("content").innerHTML=str;
}
//回调函数复杂回调函数
function showcomplex(dataResponse)
{
var data = eval('(' + dataResponse.responseText + ')');
var str='';
for(var i=0;i<data.js.length;i++)
{
str+='<ul>';
str+='<li>'+data.js.id+'</li>';
str+='<li>'+data.js.age+'</li>';
str+='<li>'+data.js.name+'</li>';
str+='<li>'+data.js.address+'</li>';
str+='</ul>';
}
document.getElementById("content").innerHTML=str;
}
//获取简单的json数据
function getesay(){
var url = 'test.do';
var pars = 'method=getEasy';
var ajax = new Ajax.Request(
url,
{method:'post',parameters:pars,onComplete:showesay}
);
}
//获取对象级复杂数据
function getcomplex(){
var url = 'test.do';
var pars = 'method=getComplex';
var ajax = new Ajax.Request(
url,
{method:'post',parameters:pars,onComplete:showcomplex}
);
}
///////////////////////////////////////struts-config.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.2//EN" "http://struts.apache.org/dtds/struts-config_1_2.dtd">
<struts-config>
<data-sources />
<form-beans />
<global-exceptions />
<global-forwards />
<action-mappings >
<action path="/test" parameter="method" type="com.json.struts.action.TestAction">
</action>
</action-mappings>
<message-resources parameter="com.json.struts.ApplicationResources" />
</struts-config>
////////////////////////////////TestAction.java
/*
* Generated by MyEclipse Struts
* Template path: templates/java/JavaClass.vtl
*/
package com.json.struts.action;
import java.io.PrintWriter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.actions.DispatchAction;
import net.sf.json.*;
/**
* @author hxw
*
*/
public class TestAction extends DispatchAction {
/**
* 获取简单组合数据
*/
public ActionForward getEasy(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response) {
response.setContentType("text/html; charset=GBK");
try
{
PrintWriter out = response.getWriter();
//这里的数据拼装一般是从数据库查询来的
JSONObject jsonObject = new JSONObject();
jsonObject.put("param1", "变量一");
jsonObject.put("param2", "变量二");
out.print(jsonObject.toString());
out.flush();
out.close();
return null;
}catch(Exception e)
{
e.printStackTrace();
return null;
}
}
/**
* 获取复杂组合数据
*/
public ActionForward getComplex(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response) {
response.setContentType("text/html; charset=GBK");
try
{
PrintWriter out = response.getWriter();
JSONObject obj = new JSONObject();
JSONArray js = new JSONArray();
//这里的数据拼装一般是从数据库查询来的
for(int i=0;i<3;i++)
{
JSONObject objtemp = new JSONObject();
objtemp.put("id", i);
objtemp.put("age", "23");
objtemp.put("name", "test"+i);
objtemp.put("address", "test");
js.add(objtemp);
}
obj.put("js",js);
out.print(obj.toString());
}catch(Exception e)
{
e.printStackTrace();
System.out.print("消费明细json存储异常");
}
return null;
}
}
////////////////////////////test.jsp
<%@ page language="java" import="java.util.*" contentType="text/html;charset=gbk"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>json练习</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">
<script type="text/javascript"src="js/prototype.js"></script>
<script type="text/javascript"src="js/toolhxw.js"></script>
</head>
<body>
<div id="func" >
<a href='javascript:getesay()'>获取简单组合数据</a>
<a href='javascript:getcomplex()'>获取复杂组合数据</a>
</div>
<div id="content">
正在获取内容...
</div>
</body>
</html>
大家将这几个文件拷贝到你的myeclipse的web项目中，发布运行即可。
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