Java操作JSON数据(2)--Gson操作JSON数据

package com.inspur.demo.json;

import java.lang.reflect.modifier;
import java.lang.reflect.type;
import java.util.arraylist;
import java.util.calendar;
import java.util.hashmap;
import java.util.list;
import java.util.map;

import com.google.gson.gson;
import com.google.gson.gsonbuilder;
import com.google.gson.jsonarray;
import com.google.gson.jsonelement;
import com.google.gson.jsonobject;
import com.google.gson.jsonparser;
import com.google.gson.reflect.typetoken;

/**
 * gson操作json数据
 */
public class gsoncase {
    /**
     * 序列化
     */
    public static string serialize() {
        mybean bean = new mybean();
        bean.sets("测试字符串");
        calendar calendar = calendar.getinstance();
        calendar.add(calendar.hour_of_day, -1);
        bean.setd(calendar.gettime());

        list<mybean> list = new arraylist<mybean>();
        list.add(bean);
        map<string, list<mybean>> map = new hashmap<string, list<mybean>>();
        map.put("data", list);

        gson gson = new gsonbuilder()
                .serializenulls() //序列化值为null的字段
                .setdateformat("yyyy-mm-dd hh:mm:ss") //设置日期格式
                .excludefieldswithmodifiers(modifier.static)//根据修饰符过滤字段
                .create();
        string result = gson.tojson(map);
        system.out.println(result);
        return result;
    }

    /**
     * 反序列化
     */
    public static void deserialize() {
        string s = serialize();
        gson gson = new gsonbuilder()
                .setdateformat("yyyy-mm-dd hh:mm:ss") //设置日期格式
                .create();
        type type = new typetoken<map<string, list<mybean>>>(){}.gettype();
        map<string, list<mybean>> map =  gson.fromjson(s, type);
        system.out.println(map);
        
        //直接通过api获取相应数据
        jsonelement element = jsonparser.parsestring(s);
        jsonarray data = element.getasjsonobject().getasjsonarray("data");
        jsonobject bean = data.get(0).getasjsonobject();
        system.out.println(bean.get("s").getasstring());
        //...
    }
    
    public static void main(string[] args) {
        serialize();
        deserialize();
    }

}

package com.inspur.demo.json;

import java.util.arrays;
import java.util.date;

public class mybean {
    private string s = "字符串";
    private string s2;
    private string s3 = "字符串3";
    private int i = 123;
    private integer i2;
    private char c = '到';
    private char[] c2 = new char[]{'a', 'b'};
    private date d = new date();
    private date[] d2 = new date[]{new date(), new date()};
    public string gets() {
        return s;
    }
    public void sets(string s) {
        this.s = s;
    }
    public string gets2() {
        return s2;
    }
    public void sets2(string s2) {
        this.s2 = s2;
    }
    public string gets3() {
        return s3;
    }
    public void sets3(string s3) {
        this.s3 = s3;
    }
    public int geti() {
        return i;
    }
    public void seti(int i) {
        this.i = i;
    }
    public integer geti2() {
        return i2;
    }
    public void seti2(integer i2) {
        this.i2 = i2;
    }
    public char getc() {
        return c;
    }
    public void setc(char c) {
        this.c = c;
    }
    public char[] getc2() {
        return c2;
    }
    public void setc2(char[] c2) {
        this.c2 = c2;
    }
    public date getd() {
        return d;
    }
    public void setd(date d) {
        this.d = d;
    }
    public date[] getd2() {
        return d2;
    }
    public void setd2(date[] d2) {
        this.d2 = d2;
    }
    @override
    public string tostring() {
        return "mybean [s=" + s + ", s2=" + s2 + ", s3=" + s3 + ", i=" + i + ", i2=" + i2 + ", c=" + c + ", c2="
                + arrays.tostring(c2) + ", d=" + d + ", d2=" + arrays.tostring(d2) + "]";
    }
}