fast-json 生成与解析json数据

来源：互联网发布：普罗米修斯剧情知乎编辑：程序博客网时间：2024/06/05 16:42
package com.example.jsondata;import android.app.Activity;import android.os.Bundle;import android.util.Log;import com.alibaba.fastjson.JSON;import com.alibaba.fastjson.TypeReference;import java.lang.reflect.Type;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;/* fast-json 处理复杂的json数据（生成json、解析jsOn） */public class FastJsonActivity extends Activity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_fast_json);        //生成Json数据          toJson();        //解析Json数据         parseJson();    }     /*        将封装的实体类数据生成Json格式的数据      */     private void toJson() {         //生成一个单一的jsonObject 数据         tojsonObject();         //生成一个单一的jisonArray 数据         tojsonArray();         //生成一个jsonObject和jsonArray嵌套的json数据(外层jsonObject{ 内层jsonArray[]})         tojsondata();         //生成一个jsonObject和jsonArray嵌套的json数据(外层jsonArray[内层jsonObject{}])         tojsondata2();     }    /*      将json格式的数据解析封装在实体类或集和中     */    private void parseJson() {        //javaBean  将一个jsonObject字符串，解析成一个实体类对象        parseToJavaBean();        //List<javaBean>  将一个jsonArray，解析成一个泛型为实体类的List集合        parseToList();        //List<Map<String,Object> 将一个复杂（嵌套）的json数据解析成一个泛型为map的List集合        parseToListMap();    }    private String tojsonObject() {        User user=new User("alittlestone","1742772822",'男',"202028ma");        String userJsonStr = JSON.toJSONString(user);        Log.i("show","tojsOnString结果："+userJsonStr);        return userJsonStr;    }    private String tojsonArray() {        List<User> users1=new ArrayList<>();        users1.add(new User("alittlewind","1737772822",'男',"20202s2saa"));        users1.add(new User("alittlestone","1742772822",'男',"2020ajj1"));        users1.add(new User("alittwater","1746215222",'女',"2020sjj1"));        String userJsonArrayStr = JSON.toJSONString(users1);//不会导致key值无序        // Object user=JSON.toJSON(users1);  该方法和JSON.toJSONString() 返回值一样，但是key 值是无序的        Log.i("show","生成jsonArray结果："+userJsonArrayStr);        return userJsonArrayStr;    }    private String  tojsondata() {        List<User> users=new ArrayList<>();        users.add(new User("alittlewind","1737772822",'男',"20202s2saa"));        users.add(new User("alittlestone","1742772822",'男',"2020ajj1"));        users.add(new User("alittwater","1746215222",'女',"2020sjj1"));        UserGroup usergroup=new UserGroup(users,"北京",3);        String group = JSON.toJSONString(usergroup);        Log.i("show","嵌套json数据"+group);        return group;    }    private String tojsondata2() {        Map<String,User> map=new HashMap<>();        map.put("user1",new User("alittlewind","1737772822",'男',"20202s2saa"));        map.put("user2",new User("ayahdh1jd","17727272822",'男',"jaj1nsa"));        Map<String,User> map2=new HashMap<>();        map2.put("user3",new User("sjfjajfaa","118236667222",'男',"fkaasllj"));        List<Map<String,User>> list=new ArrayList<>();        list.add(map);        list.add(map2);        String jsondata2 = JSON.toJSONString(list);        Log.i("show","jsondata:"+jsondata2);        return jsondata2;    }    private void parseToJavaBean() {        String obj = tojsonObject();        User user = JSON.parseObject(obj, User.class);        Log.i("show","将jsonObject对象解析成实体类"+user);    }    private void parseToList() {        String arr=tojsonArray();        List<User> users = JSON.parseArray(arr, User.class);        Log.i("show","将jsonObject对象解析成以实体类为泛型的集合"+users);    }    private void parseToListMap() {        String str = tojsondata2();        Type type=new TypeReference<List<Map<String,User>>>(){}.getType();        List<Map<String,User>> list= JSON.parseObject(str,type);        Log.i("show","list"+list);    }}

/** * 封装的实体类 User类 */public class User {    private String name;    private String phone;    private char sex;    private String password;    public User() {    }    public User(String name, String phone, char sex, String password) {        this.name = name;        this.phone = phone;        this.sex = sex;        this.password = password;    }    public void setName(String name) {        this.name = name;    }    public void setPhone(String phone) {        this.phone = phone;    }    public void setSex(char sex) {        this.sex = sex;    }    public void setPassword(String password) {        this.password = password;    }    public String getName() {        return name;    }    public String getPhone() {        return phone;    }    public char getSex() {        return sex;    }    public String getPassword() {        return password;    }    @Override    public String toString() {        return "user=name:"+name+",password:"+password+",phone:"+phone+",sex"+sex;    }}
/** *  封装的实体类 UserGroup类
 */
public class UserGroup {    private List<User> users;    private String address;    private int count;    public UserGroup() {    }    public UserGroup(List<User> users,String address,int count) {        this.address=address;        this.users = users;        this.count=count;    }    public void setUsers(List<User> users) {        this.users = users;    }    public void setAddress(String address) {        this.address = address;    }    public void setCount(int count) {        this.count = count;    }    public List<User> getUsers() {        return users;    }    public String getAddress() {        return address;    }    public int getCount() {        return count;    }    @Override    public String toString() {        return "userGroup= users:"+users+",address:"+address+",count:"+count;    }}
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