jar包:import net.sf.json.JSONObject;

1.解析json字符串

將json字符串轉換為json對象，然後再解析json對象:。
JSONObjectjsonObject = JSONObject.fromObject(jsonStr);
根據json中的鍵得到它的值
Stringname = jsonObject.getString("name");
int age = jsonObject.getInt("age");

2.將json字符串轉換為Java對象
同樣先將json字符串轉換為json對象，再將json對象轉換為java對象，如下所示。
JSONObjectobj = new JSONObject().fromObject(jsonStr);//將json字符串轉換為json對象
將json對象轉換為java對象
Personjb = (Person)JSONObject.toBean(obj,Person.class);//將建json對象轉換為Person對象

3.將java對象轉換為json字符串

實例代碼:

1. package Test3;
3. public class Person {
5. private int age;
6. public int getAge() {
7. return age;
8. }
9. public void setAge(int age) {
10. this.age = age;
11. }
12. public String getName() {
13. return name;
14. }
15. public void setName(String name) {
16. this.name = name;
17. }
18. private String name;
19. public String toString() {
20. return "Person [age=" + age + ", name=" + name + "]";
21. }
22. public Person(int age, String name) {
23. super();
24. this.age = age;
25. this.name = name;
26. }
28. public Person(String personStr){
30. }
32. public Person(){
34. }
35. }

1. package Test3;
2. import net.sf.json.JSONObject;
5. public class JsonToObject {
7. /**
8. * @param args
9. */
10. public void test(){
12. System.out.println("將object對象，字符串轉為json對象");
14. Person person = new Person(1, "cgf");
16. JSONObject json = JSONObject.fromObject(person);
18. System.out.println(json);
20. System.out.println("將字符串轉成JSON對象，再轉為自定義對象");
22. String jsonString = "{" + "age" + ":1" + "," + "name" + ":" + "‘wbj‘" + "}";
24. JSONObject jsonObject = JSONObject.fromObject(jsonString);
26. System.out.println(jsonObject);
28. Person person1 = (Person) JSONObject.toBean(jsonObject, Person.class);
30. System.out.println("名字："+person1.getAge() + "年齡:" + person1.getName());
32. System.out.println("將Java對象轉為json字符串");
34. JSONObject json1 = JSONObject.fromObject(person);
36. String jsonString1 = json1.toString();
38. System.out.println(jsonString1);
40. }
42. public static void main(String[] args) {
43. // TODO Auto-generated method stub
45. JsonToObject json = new JsonToObject();
47. json.test();
49. }
51. }

java對象與json對象之間的轉換