GSON 使用记录

今天在网上瞎逛的时候发现了一个东西，发出来共享一下，就是GSON了

GSON 是什么，维基百科上的解析 http://zh.wikipedia.org/wiki/Gson

项目的源地址 https://code.google.com/p/google-gson/

我的理解，就是一个自动把JSON解析为对象，把对象变成JSON的工具包

到底有多简单,下面两行代码就可以解析下下图的JSON了

image

image（PS:屏幕太小，截取不到下面）

是不是很吊

下面我们看具体实现

项目的具体架构

image

我们先看一下JSON数据的结构

{
    "statuses": [
        {
            "created_at": "Tue May 31 17:46:55 +0800 2011",
            "id": 11488058246,
            "text": "求关注。"，
            "source": "<a href="http://weibo.com" rel="nofollow">新浪微博</a>",
            "favorited": false,
            "truncated": false,
            "in_reply_to_status_id": "",
            "in_reply_to_user_id": "",
            "in_reply_to_screen_name": "",
            "geo": null,
            "mid": "5612814510546515491",
            "reposts_count": 8,
            "comments_count": 9,
            "annotations": [],
            "user": {
                "id": 1404376560,
                "screen_name": "zaku",
                "name": "zaku",
                "province": "11",
                "city": "5",
                "location": "北京 朝阳区",
                "description": "人生五十年，乃如梦如幻；有生斯有死，壮士复何憾。",
                "url": "http://blog.sina.com.cn/zaku",
                "profile_image_url": "http://tp1.sinaimg.cn/1404376560/50/0/1",
                "domain": "zaku",
                "gender": "m",
                "followers_count": 1204,
                "friends_count": 447,
                "statuses_count": 2908,
                "favourites_count": 0,
                "created_at": "Fri Aug 28 00:00:00 +0800 2009",
                "following": false,
                "allow_all_act_msg": false,
                "remark": "",
                "geo_enabled": true,
                "verified": false,
                "allow_all_comment": true,
                "avatar_large": "http://tp1.sinaimg.cn/1404376560/180/0/1",
                "verified_reason": "",
                "follow_me": false,
                "online_status": 0,
                "bi_followers_count": 215
            }
        },
        ...
    ],
    "ad": [
        {
            "id": 3366614911586452,
            "mark": "AB21321XDFJJK"
        },
        ...
    ],
    "previous_cursor": 0,               
    "next_cursor": 11488013766,    
    "total_number": 81655
}

JSON数据的结构图

image

要使用GSON，我们要做的事情就是在每个层面都创建一个javabean,字段名要和json里面的字段名一样

然后我们就可以用上面两行代码解析好我们的数据了（不想解析的数据，就不要写那个字段就可以，如果解析的是数组，就在里面创建一个父类是Collection

对象，名字还是要和JSON数据里面的字段一样）

下面就是贴代码的地方

MainClass.Java(这里我偷懒了，使用MainClass当第一层JavaBean）

import com.google.gson.Gson;

import java.util.ArrayList;

/**
 * Created with IntelliJ IDEA.
 * User: Auggie Liang
 * Date: 13-10-17
 * Time: 下午2:24
 */
public class MainClass {

    private ArrayList<WeiboType> statuses;

    public ArrayList<WeiboType> getStatuses() {
        return statuses;
    }

    public void setStatuses(ArrayList<WeiboType> statuses) {
        this.statuses = statuses;
    }

    public static void main(String[] args){
        Gson gson = new Gson();
        MainClass mainClass = gson.fromJson(json,MainClass.class);
        //测试是否获取到了
        System.out.println(mainClass.getStatuses().get(0).getText());
    }



    public static final String json ="{
" +
            "    "statuses": [
" +
            "        {
" +
            "            "created_at": "Tue May 31 17:46:55 +0800 2011",
" +
            "            "id": 11488058246,
" +
            "            "text": "求关注。"，
" +
            "            "source": "<a href="http://weibo.com" rel="nofollow">新浪微博</a>",
" +
            "            "favorited": false,
" +
            "            "truncated": false,
" +
            "            "in_reply_to_status_id": "",
" +
            "            "in_reply_to_user_id": "",
" +
            "            "in_reply_to_screen_name": "",
" +
            "            "geo": null,
" +
            "            "mid": "5612814510546515491",
" +
            "            "reposts_count": 8,
" +
            "            "comments_count": 9,
" +
            "            "annotations": [],
" +
            "            "user": {
" +
            "                "id": 1404376560,
" +
            "                "screen_name": "zaku",
" +
            "                "name": "zaku",
" +
            "                "province": "11",
" +
            "                "city": "5",
" +
            "                "location": "北京 朝阳区",
" +
            "                "description": "人生五十年，乃如梦如幻；有生斯有死，壮士复何憾。",
" +
            "                "url": "http://blog.sina.com.cn/zaku",
" +
            "                "profile_image_url": "http://tp1.sinaimg.cn/1404376560/50/0/1",
" +
            "                "domain": "zaku",
" +
            "                "gender": "m",
" +
            "                "followers_count": 1204,
" +
            "                "friends_count": 447,
" +
            "                "statuses_count": 2908,
" +
            "                "favourites_count": 0,
" +
            "                "created_at": "Fri Aug 28 00:00:00 +0800 2009",
" +
            "                "following": false,
" +
            "                "allow_all_act_msg": false,
" +
            "                "remark": "",
" +
            "                "geo_enabled": true,
" +
            "                "verified": false,
" +
            "                "allow_all_comment": true,
" +
            "                "avatar_large": "http://tp1.sinaimg.cn/1404376560/180/0/1",
" +
            "                "verified_reason": "",
" +
            "                "follow_me": false,
" +
            "                "online_status": 0,
" +
            "                "bi_followers_count": 215
" +
            "            }
" +
            "        },
" +
            "        ...
" +
            "    ],
" +
            "    "ad": [
" +
            "        {
" +
            "            "id": 3366614911586452,
" +
            "            "mark": "AB21321XDFJJK"
" +
            "        },
" +
            "        ...
" +
            "    ],
" +
            "    "previous_cursor": 0,                   
" +
            "    "next_cursor": 11488013766,    
" +
            "    "total_number": 81655
" +
            "}";
}

WeiboType.Java

/**
 * @author Listen_Enci screen_name 昵称 text 内容 create_at 发布时间 source 来源（来自微博秀）
 *         profile_image_url 头像的Url
 */
public class WeiboType {

    /**
     * 创建时间
     */
    private String create_at;

    /**
     * 微博 ID
     */
    private String id;

    /**
     * 微博MID
     */
    private String mid;

    /**
     * 微博内容
     */
    private String  text;

    /**
     * 缩略图
     */
    private String thumbnail_pic;

    /**
     * 中型图片
     */
    private String bmiddle_pic;

    /**
     * 原图地址
     */
    private String original_pic;

    /**
     * 微博来源
     */
    private String source;

    /**
     * 微博用户信息
     */
    private WeiboUserType user;

    public String getCreate_at() {
        return create_at;
    }

    public void setCreate_at(String create_at) {
        this.create_at = create_at;
    }

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getMid() {
        return mid;
    }

    public void setMid(String mid) {
        this.mid = mid;
    }

    public String getText() {
        return text;
    }

    public void setText(String text) {
        this.text = text;
    }

    public String getThumbnail_pic() {
        return thumbnail_pic;
    }

    public void setThumbnail_pic(String thumbnail_pic) {
        this.thumbnail_pic = thumbnail_pic;
    }

    public String getBmiddle_pic() {
        return bmiddle_pic;
    }

    public void setBmiddle_pic(String bmiddle_pic) {
        this.bmiddle_pic = bmiddle_pic;
    }

    public String getOriginal_pic() {
        return original_pic;
    }

    public void setOriginal_pic(String original_pic) {
        this.original_pic = original_pic;
    }

    public String getSource() {
        return source;
    }

    public void setSource(String source) {
        this.source = source;
    }


    public WeiboUserType getUser() {
        return user;
    }

    public void setUser(WeiboUserType user) {
        this.user = user;
    }
}

WeiboUserType.java

/**
 * Created With Android Studio
 * User Auggie Liang
 * Date 13-10-17
 * Time 上午11:51
 * 微博用户类型
 */
public class WeiboUserType {
    /**
     * 用户ID，字符串
     */
    private String idstr;

    /**
     * 显示名
     */
    private String screen_name;

    /**
     * 用户头像地址
     */
    private String profile_image_url;

    public String getIdstr() {
        return idstr;
    }

    public void setIdstr(String idstr) {
        this.idstr = idstr;
    }

    public String getScreen_name() {
        return screen_name;
    }

    public void setScreen_name(String screen_name) {
        this.screen_name = screen_name;
    }

    public String getProfile_image_url() {
        return profile_image_url;
    }

    public void setProfile_image_url(String profile_image_url) {
        this.profile_image_url = profile_image_url;
    }
}
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原文地址：https://www.cnblogs.com/Jabba93/p/3375310.html