$Java-json系列（二）：用JSONObject解析和处理json数据

// 简单的json测试字符串
public static final String JSON_SIMPLE = "{'name':'tom','age':16}"; JSONObject obj = JSONObject.fromObject(JSON_SIMPLE);
System.out.println("name is : " + obj.get("name"));
System.out.println("age is : " + obj.get("age"));

// 嵌套的json字符串
public static final String JSON_MULTI = "{'name':'tom','score':{'Math':98,'English':90}}";
JSONObject obj = JSONObject.fromObject(JSON_MULTI);
System.out.println("name is : " + obj.get("name"));
System.out.println("score is : " + obj.get("score")); JSONObject scoreObj = (JSONObject) obj.get("score");
System.out.println("Math score is : " + scoreObj.get("Math"));
System.out.println("English score is : " + scoreObj.get("English"));

public class Person {
private String name; private Info info; public String getName() {
return name;
} public void setName(String name) {
this.name = name;
} public Info getInfo() {
return info;
} public void setInfo(Info info) {
this.info = info;
} @Override
public String toString() {
return "Person [name=" + name + ", info=" + info + "]";
} }

public class Info {
private int age;
private Score score; public int getAge() {
return age;
} public void setAge(int age) {
this.age = age;
} public Score getScore() {
return score;
} public void setScore(Score score) {
this.score = score;
} @Override
public String toString() {
return "Info [age=" + age + ", score=" + score + "]";
} }

public class Score {
private String math;
private String english; public String getMath() {
return math;
} public void setMath(String math) {
this.math = math;
} public String getEnglish() {
return english;
} public void setEnglish(String english) {
this.english = english;
} @Override
public String toString() {
return "Score [math=" + math + ", english=" + english + "]";
} }

Score score = new Score();
score.setEnglish("A");
score.setMath("B"); Info info = new Info();
info.setAge(20);
info.setScore(score); Person person = new Person();
person.setInfo(info);
person.setName("Tim"); JSONObject obj = JSONObject.fromObject(person);
System.out.println(obj.toString());

// 数组形式的json
public static final String JSON_ARRAY = "[{'name':'tom'},{'name':'john','age':20},{}]"; JSONArray arr = JSONArray.fromObject(JSON_ARRAY);
System.out.println(arr); for (int i = 0; i < arr.size(); i++) {
JSONObject obj = arr.getJSONObject(i);
System.out.println(obj.toString());
}

JSONObject obj = new JSONObject();
obj.put("name", "tom");
obj.put("age", 19); // 子对象
JSONObject objContact = new JSONObject();
objContact.put("tel", "123456");
objContact.put("email", "tom@test.com");
obj.put("contact", objContact); // 子数组对象
JSONArray scoreArr = new JSONArray();
JSONObject objEnglish = new JSONObject();
objEnglish.put("course", "english");
objEnglish.put("result", 100);
objEnglish.put("level", "A"); JSONObject objMath = new JSONObject();
objMath.put("course", "math");
objMath.put("result", 50);
objMath.put("level", "D"); scoreArr.add(objEnglish);
scoreArr.add(objMath); obj.put("score", scoreArr); System.out.println(obj.toString());