org.json

配置pom.xml

  1. <dependencies>
  2.         <dependency>
  3.             <groupId>org.json</groupId>
  4.             <artifactId>json</artifactId>
  5.             <version>20160810</version>
  6.         </dependency>
  7.     </dependencies>

put

  1. JSONObject xiaoming = new JSONObject();
  2.         xiaoming.put("name","xiaoming");
  3.         xiaoming.put("gender","男");
  4.         xiaoming.put("age",20);
  5.         xiaoming.put("hobby",new String[]{"羽毛球","爬山"});
  6.         Object nullObject = null;
  7.         xiaoming.put("comment", nullObject);
  8.         System.out.println(xiaoming.toString());

json结果

  1. {"gender":"男","name":"xiaoming","age":20,"hobby":["羽毛球","爬山"]}

HashMap

  1. HashMap<String,Object> xiaoming = new HashMap<String, Object>();
  2.         xiaoming.put("name","xiaoming");
  3.         xiaoming.put("gender","男");
  4.         xiaoming.put("age",20);
  5.         xiaoming.put("hobby",new String[]{"羽毛球","爬山"});
  6.         Object nullObject = null;
  7.         xiaoming.put("comment", nullObject);
  8.         System.out.println(new JSONObject(xiaoming).toString());

JavaBean

  1. public class Student {
  2.     private String name;
  3.     private  String gender;
  4.     private  int age;
  5.     private  String[] hobby;
  6.     private  String comment;
  8.     public String getName() {
  9.         return name;
  10.     }
  12.     public String getGender() {
  13.         return gender;
  14.     }
  16.     public int getAge() {
  17.         return age;
  18.     }
  20.     public String[] getHobby() {
  21.         return hobby;
  22.     }
  24.     public String getComment() {
  25.         return comment;
  26.     }
  28.     public void setName(String name) {
  29.         this.name = name;
  30.     }
  32.     public void setGender(String gender) {
  33.         this.gender = gender;
  34.     }
  36.     public void setAge(int age) {
  37.         this.age = age;
  38.     }
  40.     public void setHobby(String[] hobby) {
  41.         this.hobby = hobby;
  42.     }
  44.     public void setComment(String comment) {
  45.         this.comment = comment;
  46.     }
  47.     public String toString() {
  48.         return "Student{" +
  49.                 "name='" + name + '\'' +
  50.                 ", gender='" + gender + '\'' +
  51.                 ", age=" + age +
  52.                 ", hobby=" + Arrays.toString(hobby) +
  53.                 ", comment='" + comment + '\'' +
  54.                 ", ingorVal='" + ingorVal + '\'' +
  55.                 '}';
  56.     }
  57. }
  1. Student xiaoming = new  Student();
  2.         xiaoming.setName("xiaoming");
  3.         xiaoming.setGender("男");
  4.         xiaoming.setAge(20);
  5.         xiaoming.setHobby(new String[]{"羽毛球","爬山"});
  6.         xiaoming.setComment(null);
  7.         System.out.println(new JSONObject(xiaoming).toString());

解析JSON

  1. String jsonStr = "{\"gender\":\"男\",\"name\":\"xiaoming\",\"age\":20,\"hobby\":[\"羽毛球\",\"爬山\"]}";
  2.         JSONObject jsonContent = new JSONObject(jsonStr);
  3.         System.out.println("name="+jsonContent.getString("name"));
  4.         System.out.println("age="+jsonContent.getInt("age"));
  5.         System.out.println("hobby="+jsonContent.getJSONArray("hobby").getString(0));

gson

  1. <dependency>
  2.   <groupId>com.google.code.gson</groupId>
  3.   <artifactId>gson</artifactId>
  4.   <version>2.8.5</version>
  5. </dependency>
  1. Student xiaoming = new  Student();
  2.         xiaoming.setName("xiaoming");
  3.         xiaoming.setGender("男");
  4.         xiaoming.setAge(20);
  5.         xiaoming.setHobby(new String[]{"羽毛球","爬山"});
  6.         xiaoming.setComment(null);
  7.         System.out.println(new Gson().toJson(xiaoming));

注解 @SerializedName 

  1. @SerializedName("Name")
  2.     private String name;
  3.     @SerializedName("Gender")
  4.     private  String gender;
  5.     @SerializedName("Age")
  6.     private  int age;
  7.     @SerializedName("Hobby")
  8.     private  String[] hobby;
  9.     @SerializedName("Comment")
  10.     private  String comment;
  1. GsonBuilder builder = new GsonBuilder();
  2.         builder.setFieldNamingStrategy(new FieldNamingStrategy() {
  3.             public String translateName(Field field) {
  4.                 String name = field.getName();
  5.                 char [] cs = name.toCharArray();
  6.                 cs[0]-=32;
  7.                 return String.valueOf(cs);
  8.             }
  9.         });
  11.         System.out.println(builder.create().toJson(xiaoming));

transient 忽略某个字段

  1. private transient String ingorVal;

解析json

  1. String jsonStr = "{\"gender\":\"男\",\"name\":\"xiaoming\",\"age\":20,\"hobby\":[\"羽毛球\",\"爬山\"]}";
  2.         Gson gson = new Gson();
  3.         Student s = gson.fromJson(jsonStr,Student.class);
  4.         System.out.println(s);