Struts2.1.6中关于JSON的配置和使用

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json jQuery Struts Ajax JavaScript

JSON的优点众所周知,在此不作叙述.
JSON在AJAX的应该比较的多些,下面结合一下struts2.1.6和大家分享一下
1,需要把jsonplugin-0.33.jar拷贝到Web-INF/lib目录下.
关于这个JAR包是JSON在struts2.1.6插件包.里面有我们要用到的struts-plugin.xml,关于这个JAR包,经过本人的测试和网上的搜索,得出最新的0.7版本在cglib方面存在着问题,建议大家使用0.33版本.
2,在struts2.1.6的配置文件中进行配置,就是返回的类型是json,并且要为JSON数据单独创建一个Package,继承的包不再是struts-default,而是json-default
示例代码如下:

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<package name="json" namespace="/json" extends="json-default">
    
    <action name="jsonTest_*" class="jsonTest" method="{1}">
         <result name="jsonres" type="json"/>
    </action>
</package>
<package name="json" namespace="/json" extends="json-default">
    
    <action name="jsonTest_*" class="jsonTest" method="{1}">
         <result name="jsonres" type="json"/>
    </action>
</package>

3,前台页面用Ajax接收到的是JSON数据格式,
{"hashMap":{"name":"wangsh","pass":"qihuan"},"pass":"这是密码啊Password","username":"wangsh"}.
本人的前采用的是Jquery1.2.6中的Ajax Post方式异步提交的.
示例代码如下:
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<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ page contentType="text/html; charset=UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
    <head>
       <title><s:text name="%{getText('regsiterpagetitle')}" />
       </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="${pageContext.request.contextPath}/common/resource/jquery-1.2.6.js" mce_src="${pageContext.request.contextPath}/common/resource/jquery-1.2.6.js"></SCRIPT>

       <SCRIPT type="text/javascript">
           function testJosn()
           {
              $.post(
              "${pageContext.request.contextPath}/json/jsonTest_jsontest.html",
              {username:"wangsh"},
              function (data)
              {
                  window.alert(data+"=====");
                  eval("json="+data);
                  window.alert("----------"+json.username);
                  $("#testjson").html(data);
              }
              );
           }
       </SCRIPT>
    </head>
    <body>
       <a
           href="${pageContext.request.contextPath}/json/jsonTest_jsontest.html" mce_href="${pageContext.request.contextPath}/json/jsonTest_jsontest.html">测试Json</a>
       <button name="测试JSON" id="testbut" onclick="testJosn();">
           测试JSON
       </button>
       <div id="testjson"></div>
    </body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ page contentType="text/html; charset=UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
    <head>
       <title><s:text name="%{getText('regsiterpagetitle')}" />
       </title>
       <meta http-equiv="pragma" content="no-cache">
       <meta http-equiv="cache-control" content="no-cache">
       <meta http-equiv="expires" content="0">
       <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
       <meta http-equiv="description" content="This is my page">
       <SCRIPT type="text/javascript"
           src="${pageContext.request.contextPath}/common/resource/jquery-1.2.6.js" mce_src="${pageContext.request.contextPath}/common/resource/jquery-1.2.6.js"></SCRIPT>

       <SCRIPT type="text/javascript">
           function testJosn()
           {
              $.post(
              "${pageContext.request.contextPath}/json/jsonTest_jsontest.html",
              {username:"wangsh"},
              function (data)
              {
                  window.alert(data+"=====");
                  eval("json="+data);
                  window.alert("----------"+json.username);
                  $("#testjson").html(data);
              }
              );
           }
       </SCRIPT>
    </head>
    <body>
       <a
           href="${pageContext.request.contextPath}/json/jsonTest_jsontest.html" mce_href="${pageContext.request.contextPath}/json/jsonTest_jsontest.html">测试Json</a>
       <button name="测试JSON" id="testbut" onclick="testJosn();">
           测试JSON
       </button>
       <div id="testjson"></div>
    </body>
</html>

可能细心的朋友已看到了:
eval("json="+data);
window.alert("----------"+json.username);
以上的代码是何义呢?
Data是Action返回的数据.
以下是Action的代码:

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package com.wang.struts2.action;

import java.util.HashMap;
import java.util.Map;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import com.opensymphony.xwork2.ActionSupport;

public class JosnTestAction extends ActionSupport
{
       private Log log = LogFactory.getLog(JosnTestAction.class);
       private String username;
       private String pass;
       private Map<String, String> hashMap = new HashMap<String, String>();

       public String getUsername()
       {
              return username;
       }

       public void setUsername(String username)
       {
              this.username = username;
       }

       public Map<String, String> getHashMap()
       {
              return hashMap;
       }

       public void setHashMap(Map<String, String> hashMap)
       {
              this.hashMap = hashMap;
       }

       public String getPass()
       {
              return pass;
       }

       public void setPass(String pass)
       {
              this.pass = pass;
       }

       public String jsontest() throws Exception
       {
              hashMap.put("name", this.getUsername());
              hashMap.put("pass", "qihuan");
              this.setPass("这是密码啊Password");
              log.info("===========测试JSON============");
              return "jsonres";
       }
}
package com.wang.struts2.action;

import java.util.HashMap;
import java.util.Map;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import com.opensymphony.xwork2.ActionSupport;

public class JosnTestAction extends ActionSupport
{
       private Log log = LogFactory.getLog(JosnTestAction.class);
       private String username;
       private String pass;
       private Map<String, String> hashMap = new HashMap<String, String>();

       public String getUsername()
       {
              return username;
       }

       public void setUsername(String username)
       {
              this.username = username;
       }

       public Map<String, String> getHashMap()
       {
              return hashMap;
       }

       public void setHashMap(Map<String, String> hashMap)
       {
              this.hashMap = hashMap;
       }

       public String getPass()
       {
              return pass;
       }

       public void setPass(String pass)
       {
              this.pass = pass;
       }

       public String jsontest() throws Exception
       {
              hashMap.put("name", this.getUsername());
              hashMap.put("pass", "qihuan");
              this.setPass("这是密码啊Password");
              log.info("===========测试JSON============");
              return "jsonres";
       }
}

也就是说服务器返加在的数据是所有的Action属性,当然要提供读写器(get和Set方法)的.
我们可以采用简单的两行代码
eval("json="+data);//将JSON转化为一个对象,并且名为joson
window.alert("----------"+json.username);//打印出Username的值
window.alert("----------"+json.hashMap.pass);//拿到的是Map中的某个值.
可以很方便的取得JSON中的任何一个属性.

本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/minjiaren/archive/2009/06/01/4232246.aspx

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2009-11-02 19:35
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