使用json-lib 数据格式转换

今天想用JSON来处理数据，在网上查了些，现贴出来分享

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>