JSON-lib转化JAVA对象为JSON格式字符串

来源：互联网发布：推荐系统的算法编辑：程序博客网时间：2024/04/29 14:54

续上文

还有一种方法是用JSON-lib转化成JSON格式字符串，需要加入json-lib-2.2-jdk13.jar和5个类库:

commons-lang-2.0.jar

commons-io-1.3.2.jar

commons-collections-3.2.jar

commons-beanutils-1.7.0.jar

ezmorph-1.0.4.jar

其中JSON-lib包可以到http://json-lib.sourceforge.net下载

如果用这种方法转化，则需要添加一个封装类：例如ListRange.java

下面是内容

import java.util.ArrayList;import java.util.List;public class ListRange<T> {boolean success;String message;long totalSize;List<T> list;public ListRange() {this.totalSize = 0;this.list = new ArrayList<T>();}public long getTotalSize() {return totalSize;}public void setTotalSize(long totalSize) {this.totalSize = totalSize;}public List<T> getList() {return list;}public void setList(List<T> list) {this.list = list;}public boolean isSuccess() {return success;}public void setSuccess(boolean success) {this.success = success;}public String getMessage() {return message;}public void setMessage(String message) {this.message = message;}}

创建一个BaseAction.java

内容为：

public HttpServletRequest getRequest() { return ServletActionContext.getRequest(); } public HttpServletResponse getResponse() { return ServletActionContext.getResponse(); } public void outJsonString(String str) { getResponse().setContentType("text/javascript;charset=UTF-8"); outString(str); } public void outJson(Object obj) { outJsonString(JSONObject.fromObject(obj).toString()); } public void outJsonArray(Object array) { outJsonArray(JSONArray.fromObject(array).toString()); } public void outString(String str) { try { PrintWriter out = getResponse().getWriter(); out.write(str); } catch (IOException e) { } } public void outXMLString(String xmlStr) { getResponse().setContentType("application/xml;charset=UTF-8"); outString(xmlStr); }

创建一个TestAction.java

内容为：

public void select() { // TODO Auto-generated method stub response.setCharacterEncoding("gb2312"); ListRange<TestBean> stuList = new ListRange<TestBean>(); List<TestBean> list = TestDAO.getList(); stuList.setList(list); stuList.setTotalSize(list.size()); outJson(stuList); }

index.jsp页面内容为：

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html> <head> <title>My JSP 'index.jsp' starting page</title> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page"> <link rel="stylesheet" type="text/css" href="/ext2/resources/css/ext-all.css" mce_href="ext2/resources/css/ext-all.css" /> <mce:script type="text/javascript" src="/ext2/adapter/ext/ext-base.js" mce_src="ext2/adapter/ext/ext-base.js"></mce:script> <mce:script type="text/javascript" src="/ext2/ext-all.js" mce_src="ext2/ext-all.js"></mce:script> </head> <body> <mce:script type="text/javascript" ></mce:script> <div id="hello"> </div> </body></html>

就可以成功查询出数据了

今天开始研究这个代码，看了很久。参考了一个这样的例子，怎么弄的都没有弄出来还一直报错，后来看了一个资料书《Ext js Web应用程序开发指南》，最后在里面找到了答案，原来是我那5个类库没有导入，还有json-lib-2.2-jdk13.jar包没有导入

还有就是第一种方法，也是看了我很久不知道为什么不行，最后才注意到原来是<package name="teaweb" extends="json-default" namespace="/">这里的配置问题，终于弄出来了，感觉学到了不少东西哈哈