1.json字串轉為JSONObject物件：

String jsonStr = "{\"name\":\"1\",\"age\":1,\"id\":0}";
// json字串轉為JSONObject 物件
JSONObject jsonObject = JSONObject.fromObject(jsonStr);
System.out.println("name:" + jsonObject.get("name"));
System.out.println("age:" + jsonObject.get("age"));
System.out.println("id:" + jsonObject.get("id"));
 

2.JSONObject轉為json字串：

// JSONObject轉為json字串
String string = jsonObject.toString();
System.out.println("string" + string);

javaBean物件如下：

package pojo;
public class People {


	private int id;
	private int age;
	private String name;
	
	
	public People(int id, int age, String name) {
		super();
		this.id = id;
		this.age = age;
		this.name = name;
	}
	
	public People() {
		super();
	}


	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public int getAge() {
		return age;
	}
	public String getName() {
		return name;
	}
	public void setAge(int age) {
		this.age = age;
	}
	public void setName(String name) {
		this.name = name;
	}
	@Override
	public String toString() {
		return "People [id=" + id + ", age=" + age + ", name=" + name + "]";
	}
	
}

3.JSONObject物件轉化為javaBean物件：

// JSONObject轉為javaBean
People people = (People)JSONObject.toBean(jsonObject, People.class);
System.out.println(people);

4.javaBean物件轉為 JSONObject物件:

// javaBean轉為JSONObject物件
People javaBean = new People();
javaBean.setAge(100);
javaBean.setId(1);
javaBean.setName("samllking");
JSONObject peopleJson = JSONObject.fromObject(javaBean);
String string2 = peopleJson.toString();
System.out.println("String2 : " + string2);

例如如下的一個json字串：

[{"age":1,"id":1,"name":"first"},
{"age":2,"id":2,"name":"second"},
{"age":3,"id":3,"name":"third"}]

// 將List的Json字串轉化為List<T>集合
		String listStr = "[{\"age\":1,\"id\":1,\"name\":\"first\"},{\"age\":2,\"id\":2,\"name\":\"second\"},{\"age\":3,\"id\":3,\"name\":\"third\"}]";
		JSONArray jsonArray2 = JSONArray.fromObject(listStr);
		List<People> peopleList2 = (List<People>)JSONArray.toCollection(jsonArray2, People.class);
		for(People peo : peopleList2)
		{
			System.out.println(peo);
		}

List<People> peopleList = new ArrayList<People>();
		peopleList.add(new People(1,1,"first"));
		peopleList.add(new People(2,2,"second"));
		peopleList.add(new People(3,3,"third"));
		JSONArray jsonArray = JSONArray.fromObject(peopleList);
		// JSONArray的遍歷
		for (int i = 0; i < jsonArray.size(); i++) {
			JSONObject jsonObject2 = jsonArray.getJSONObject(i);
			People people1 = (People)jsonObject.toBean(jsonObject2, People.class);
			System.out.println(people1);
		}

這裡面還有一些坑，以後單獨寫一篇詳解。