JSON数据解析

    String str ="{'person':'oneself','info':{'name':'小王','age':22},'people':[{'a':'Brett','b':'McLaughlin','c':'aaaa'},{'a':'Jason','b':'Hunter','c':'bbbb'},{'a':'Elliotte','b':'Harold','c':'cccc'}]}";
    JSONObject jsonObj = JSONObject.fromObject(str);
    String person = jsonObj.getString("person");
    System.out.println("获取字符person:"+person);
    
    JSONObject info = jsonObj.getJSONObject("info");
    System.out.println("获取对象info  :(name:"+info.getString("name")+"  age:"+info.getString("age")+")");
    System.out.println("获取数组people:");
    JSONArray arr = jsonObj.getJSONArray("people");
    for (int i = 0; i < arr.size(); i++) {
        JSONObject o = arr.getJSONObject(i);
        String a = (String) o.get("a");
        String b = (String) o.get("b");
        String c = (String) o.get("c");
        System.out.println(a+"|"+b+"|"+c);
    }
    
    //Ajax请求带参Json数据
    //var jsonArr = new Array();
    //var str = JSON.stringify(jsonArr);   ==》JSON数组转字符串(对象同理)
    String gradeString ="[{'a':'a1','b':'b1','c':'c1'},{'a':'a2','b':'b2','c':'c2'},{'a':'a3','b':'b3','c':'c3'}]";
    JSONArray jsonArr = JSONArray.fromObject(gradeString); //此处为null，或者会直接报错
    System.out.println("解析Ajax请求传来的Json数组：");
    for (int i = 0; i < jsonArr.size(); i++) {
        JSONObject o = jsonArr.getJSONObject(i);
        String a = (String) o.get("a");
        String b = (String) o.get("b");
        String c = (String) o.get("c");
        System.out.println(a+"|"+b+"|"+c);
    }

import com.alibaba.fastjson.JSON;
import net.sf.json.JSONObject;

String message = "{'method':'test','params':{'id':'1','name':'小明','description':'翻滚吧！'}}";
System.out.println("message:"+message);
JSONObject jsonObject = JSONObject.fromObject(message); //字符转换为JSON对象
JSONObject paramsJSON = jsonObject.getJSONObject("params"); //获取JSON对象内容
System.out.println("paramsJSON.toString():"+paramsJSON.toString());
//json字符转Java对象方法一：(fastjson.jar)
Model model1 =JSON.parseObject(paramsJSON.toString(),Model.class); 
System.out.println("parseObject:"+model1.toString());
//json字符转Java对象方法二：(fastjson.jar)
JSON json = JSON.parseObject(paramsJSON.toString());
Model model2 = JSON.toJavaObject(json, Model.class); 
System.out.println("toJavaObject:"+model2.toString());
//json字符转Java对象方法三：(json.jar)
JSONObject obj = JSONObject.fromObject(json);
Model model3=(Model) JSONObject.toBean(obj, Model.class);
System.out.println("toBean:"+model3);

//java对象转JSONObject 集合转JSONArray 字符对象转JSONObject 都用fromObject
JSONObject jb = JSONObject.fromObject(model1);
System.out.println("javaToJson:"+jb.toString());

public class Model{int id;String name;String description;}

 /**
     * 封装将json对象转换为java集合对象
     */
    @SuppressWarnings({ "unused", "unchecked" })
    private <T> List<T> getJavaList(T clazz, String jsons) {
        List<T> objs=null;
        JSONArray jsonArray=(JSONArray)JSONSerializer.toJSON(jsons);
        if(jsonArray!=null){
            objs=new ArrayList<T>();
            List<T> list=(List<T>)JSONSerializer.toJava(jsonArray);
            for(Object o:list){
                JSONObject jsonObject=JSONObject.fromObject(o);
                T obj=(T)JSONObject.toBean(jsonObject, clazz.getClass());
                objs.add(obj);
            }
        }
        return objs;
    }