java代码用于返回JSON或者XML数据(extJs)

package com.hrm.util;

import java.util.ArrayList;

import java.util.List;

import net.sf.json.JSONObject;

import com.thoughtworks.xstream.XStream;

import com.thoughtworks.xstream.io.xml.DomDriver;

/**

* Title: Ext JS 辅助类

* Description: 该类用于转换java对象为XML文件格式或JSON文件格式

* @author 葛昊

* @time: 2009年2月5日11:10:54

*/

public class ExtHelper {

/**

* 通过List生成XML数据

* @param recordTotal 记录总数，不一定与beanList中的记录数相等

* @param beanList 包含bean对象的集合

* @return 生成的XML数据

*/

@SuppressWarnings("unchecked")

public static String getXmlFromList(long recordTotal , List beanList) {

Total total = new Total();

total.setResults(recordTotal);

List results = new ArrayList();

results.add(total);

results.addAll(beanList);

XStream sm = new XStream(new DomDriver());

for (int i = 0; i < results.size(); i++) {

Class c = results.get(i).getClass();

String b = c.getName();

String[] temp = b.split("\\.");

sm.alias(temp[temp.length - 1], c);

}

String xml = "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n" + sm.toXML(results);

return xml;

}

/**

* 通过List生成XML数据

* @param beanList 包含bean对象的集合

* @return 生成的XML数据

*/

@SuppressWarnings("unchecked")

public static String getXmlFromList(List beanList){

return getXmlFromList(beanList.size(),beanList);

}

/**

* 通过List生成JSON数据

* @param recordTotal 记录总数，不一定与beanList中的记录数相等

* @param beanList 包含bean对象的集合

* @return 生成的JSON数据

*/

@SuppressWarnings("unchecked")

public static String getJsonFromList(long recordTotal , List beanList){

TotalJson total = new TotalJson();

total.setResults(recordTotal);

total.setItems(beanList);

JSONObject JsonObject = JSONObject.fromObject(total);

return JsonObject.toString();

}

/**

* 通过List生成JSON数据

* @param beanList 包含bean对象的集合

* @return 生成的JSON数据

*/

@SuppressWarnings("unchecked")

public static String getJsonFromList(List beanList){

return getJsonFromList(beanList.size(),beanList);

}

/**

* 通过bean生成JSON数据

* @param bean bean对象

* @return 生成的JSON数据

*/

public static String getJsonFromBean(Object bean){

JSONObject JsonObject = JSONObject.fromObject(bean);

return JsonObject.toString();

}

}

==================相关的类TotalJson.java==========================

package com.hrm.util;

import java.util.List;

@SuppressWarnings("unchecked")

public class TotalJson {

private long results;

private List items;

public List getItems() {

return items;

}

public void setItems(List items) {

this.items = items;

}

public long getResults() {

return results;

}

public void setResults(long results) {

this.results = results;

}

}

=========================Total.java=======================

package com.hrm.util;

public class Total {

private long results;

public long getResults() {

return results;

}

public void setResults(long results) {

this.results = results;

}

}

======================相关jar==============================

json-lib-2.2.1-jdk15.jar

xstream-1.3.jar

commons的一些相关jar

例如

commons-lang-2.3.jar

commons-logging-1.0.4.jar

commons-beanutils-1.6.jar

commons-collections-3.2.jar

ezmorph-1.0.4.jar

可以使用有相关功能的jar代替

===============调用实例=======================

Struts1.x中Action里调用

public ActionForward getAllDepartment(ActionMapping map, ActionForm form,

HttpServletRequest request, HttpServletResponse response) throws Exception {

BeanFactory bf=new ClassPathXmlApplicationContext("applicationContext-*.xml");

DepartmentDao dptDao=(DepartmentDao)bf.getBean("dptManager");

List<Department> dpts=dptDao.GetAllDpt();

String json=ExtHelper.getJsonFromList(dpts);

response.setContentType("text/json;charset=utf-8");

System.out.println(json);

response.getWriter().write(json);

// String xml=ExtHelper.getXmlFromList(dpts);

// //System.out.println(xml);

// response.setContentType("application/xml;charset=utf-8");

// response.getWriter().write(xml);

return null;

}

注释部分为xml格式的返回

====================Extjs的Store===================

var _store = new Ext.data.JsonStore({

root:'items',

autoLoad : true,

fields:[

{name:'id',mapping:'id'},

{name:'dptNum',mapping:'dptNum'},

{name:'dptName',mapping:'dptName'},

{name:'dptMan',mapping:'dptMan'}

],

proxy : new Ext.data.HttpProxy({

url : 'getAllDepartment.do?method=getAllDepartment'

})

});