使用json-lib

    到http://json-lib.sourceforge.net下载json-lib-1.1-jdk15.jar，运行json还需要的包有：commons-lang.jar、commons-logging.jar，commons-beanutils.jar、xom-1.0-2005-01-05.jar、ezmorph-1.0.1.jar，可在http://www.docjar.com搜索下载。
  
l         转化数组和集合
    boolean[] boolArray = new boolean[]{true,false,true};
       JSONArray jsonArray = JSONArray.fromObject(boolArray);
       System.out.println(jsonArray);

    输出：[true,false,true]

    List list = new ArrayList();
       list.add(“第一个”);
       list.add(“第二个”);
       JSONArray jsonArray = JSONArray.fromObject(list);
    System.out.println(jsonArray);

    输出：[“第一个”, “第二个”]
     
       JSONArray jsonArray3 = JSONArray.fromObject("['json','is','easy']");
    System.out.println(jsonArray3);

    输出：[“json”, “is”, “'easy'”]

l         转化对象
转化Map
Map map = new HashMap();
map.put("name","json");
map.put("bool",Boolean.TRUE);
map.put("int",new Integer(1));
map.put("arr",new String[]{"a","b"});
map.put("func","function(i){return this.arr[i];}");

JSONObject json = JSONObject.fromObject(map);
System.out.println(json);

输出：[“name”: “json”, “bool”:true, “int”,1, “arr”:[ “a”, “b”], “func”:function(i){return this.arr[i];}]

转化Bean
MyBean.java
public class MyBean {
    private String name = "json";
    private int pojoId = 1;
    private String func1 = "function(i){return this.options[i]}";
    private JSONFunction func2 = new JSONFunction(new String[]{"i"},"return this.options[i];");
  
    //以下为get、set方法
}

MyBean bean = new MyBean();
JSONObject jsonObject = JSONObject.fromObject(bean);
System.out.println(jsonObject);

输出：
{"func1":function(i){return this.options[i]},"pojoId":1,"name":"json","func2":function(i){ return this.options[i]; }

从JSON到Beans
//转化为动态bean
String myjson = "{name=\"json\",bool:true,int:1,double:2.2,function:function(a){return a;},array:[1,2]}";
JSONObject json1 = JSONObject.fromString(myjson);
Object bean1 = JSONObject.toBean(json1);

由JSON生成XML
JSONObject json = new JSONObject(true);
XMLSerializer xmlSerializer = new XMLSerializer();
String xml = xmlSerializer.write(json);
System.out.println("xml:" + xml);

输出：xml:<?xml version="1.0" encoding="UTF-8"?>
<o null="true"/>
JSONObject json2 = JSONObject.fromObject("{\"name\":\"json\",\"bool\":true,\"int\":1}");
String xml2 = xmlSerializer.write(json2);
System.out.println("xml2:" + xml2);

输出：xml2:<?xml version="1.0" encoding="UTF-8"?>
<o><bool type="boolean">true</bool><int type="number">1</int><name type="string">json</name></o>
JSONArray json3 = JSONArray.fromObject("[1,2,3]");
String xml3 = xmlSerializer.write(json3);
System.out.println("xml3:" + xml3);

输出：xml3:<?xml version="1.0" encoding="UTF-8"?>
<a><e type="number">1</e><e type="number">2</e><e type="number">3</e></a>