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) + "]";

    }

}