Google的JSon——GSON生成JSon数据

小鱼儿 2022-08-18 00:55 190阅读 0赞

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));
        }
    
    }

gson下载链接  
http://yunpan.cn/c3whd59gPps3Q  访问密码 d317