Google的JSon——GSON生成JSon数据

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mb637f2759ea9f4 2022-11-24 17:06:38 ©著作权

文章标签 android开发 gson json java 封装 文章分类 运维

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对于JSon数据的解析，android内部有提供相应的方法，但是Google提供的JSon解析包GSon使用起来也比较简便，下面介绍一下这个包的解析方法：

1.首先我们来看一下JSon的数据封装：

{"result":1,
"personData":[{"name":"nate","age":12,"url":"http://www.baidu.com",
"schoolInfo":[{"school_name":"清华"},{"school_name":"北大"}]},
{"name":"jack","age":12,"url":"http://www.sina.com",
"schoolInfo":[{"school_name":"aaa"},{"school_name":"bbb"}]}]}

2.需要生成这个JSon文件也很简单，首先用类来封装这些数据，提供get和set方法即可，如果是数据集合，那么久用List来封装，还要注意的是变量名是和JSon数据的键值对应的：

import java.util.List;


public class Person {
  private String name;
  private int age;
  private String url;
  private List<SchoolInfo> schoolInfo;
  
  public String getName() {
    return name;
  }
  public void setName(String name) {
    this.name = name;
  }
  public int getAge() {
    return age;
  }
  public void setAge(int age) {
    this.age = age;
  }
  public String getUrl() {
    return url;
  }
  public void setUrl(String url) {
    this.url = url;
  }
  public List<SchoolInfo> getSchoolInfo() {
    return schoolInfo;
  }
  public void setSchoolInfo(List<SchoolInfo> schoolInfo) {
    this.schoolInfo = schoolInfo;
  }
  
  
}

public class SchoolInfo {
  
  private String school_name;

  public String getSchool_name() {
    return school_name;
  }

  public void setSchool_name(String school_name) {
    this.school_name = school_name;
  }
  
}

import java.util.List;


public class Result {
  private int result;
  private List<Person> personData;
  public int getResult() {
    return result;
  }
  public void setResult(int result) {
    this.result = result;
  }
  public List<Person> getPersonData() {
    return personData;
  }
  public void setPersonData(List<Person> personData) {
    this.personData = personData;
  }
  
  
}

接下来就可以使用gson包提供的Gson类进行import java.util.ArrayList;

import java.util.List;

import com.google.gson.Gson;


public class TestJson {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Result result = new Result();
        result.setResult(1);
        List<Person> list = new ArrayList<Person>();
        result.setPersonData(list);
        Person person1 = new Person();
        person1.setName("nate");
        person1.setAge(12);
        person1.setUrl("http://www.baidu.com");
        List<SchoolInfo> schools = new ArrayList<SchoolInfo>();
        SchoolInfo schoolInfo1 = new SchoolInfo();
        schoolInfo1.setSchool_name("清华");
        SchoolInfo schoolInfo2 = new SchoolInfo();
        schoolInfo2.setSchool_name("北大");
        schools.add(schoolInfo1);
        schools.add(schoolInfo2);
        person1.setSchoolInfo(schools);
        list.add(person1);
        
        Person person2 = new Person();
        person2.setName("jack");
        person2.setAge(12);
        person2.setUrl("http://www.sina.com");
        List<SchoolInfo> schools1 = new ArrayList<SchoolInfo>();
        SchoolInfo schoolInfo3 = new SchoolInfo();
        schoolInfo3.setSchool_name("aaa");
        SchoolInfo schoolInfo4 = new SchoolInfo();
        schoolInfo4.setSchool_name("bbb");
        schools1.add(schoolInfo3);
        schools1.add(schoolInfo4);
        person2.setSchoolInfo(schools1);
        list.add(person2);
        
        Gson gson = new Gson();
        System.out.println(gson.toJson(result));
    }

}