json的使用簡介

json 所依賴的jar包   均可在 jar114.com 下載到
1. commons-beanutils.jar
2. commons-collections-3.2.1.jar
3. commons-lang-2.5.jar
4. commons-logging-1.1.1.jar
5. ezmorph-1.0.6.jar
6. json-lib-2.2.3-jdk15.jar


一般使用方法

JSONArray jsonArray = JSONArray.fromObject(getList());

System.out.println(jsonArray);

 轉化數組和集合
    

boolean[] boolArray = new boolean[]{true,false,true};
       JSONArray jsonArray = JSONArray.fromObject(boolArray);
       System.out.println(jsonArray);
   輸出：[true,false,true]
    List list = new ArrayList();
       list.add(“第一個”);
       list.add(“第二個”);
       JSONArray jsonArray = JSONArray.fromObject(list);
    System.out.println(jsonArray);
   輸出：[“第一個”, “第二個”]
      
       JSONArray jsonArray3 = JSONArray.fromObject("['json','is','easy']");
    System.out.println(jsonArray3);
   輸出：[“json”, “is”, “'easy'”]
  

轉化對象

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

轉化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];");
   
    //以下爲get、set方法
}
MyBean bean = new MyBean();
JSONObject jsonObject = JSONObject.fromObject(bean);
System.out.println(jsonObject);
輸出：
{"func1":function(i){return this.options[i]},"pojoId":1,"name":"json","func2":function(i){ return this.options[i]; }

從JSON到Beans

//轉化爲動態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);
輸出：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);
輸出：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);
輸出：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>