Android数据解析——JSON

示例一：

有这样一个JSON需要解析，比如：

{
"thresholds": {
"1e-3": 65.3,
"1e-5": 76.5,
"1e-4": 71.8
}
}

希望得到对应的实体类对象。

经过观察，这是一个key-value键值对形式的json字符串，所以定义一个HashMap<String,Double>，然后对其进行反序列化即可。我们使用Gson来进行解析。

在Android Studio中导入jar包，需要两步：

1、在Android Studio中将项目视图切换到Project视图，然后将jar包复制到对应的libs目录下。

2、然后在Android Studio中右键，弹出的菜单中选择Add as Library...

最终会在gradle中添加对应配置。

代码：

 public class Data {
     public HashMap<String,Double> thresholds;
 }

 Gson gson = new Gson();
 String json = "{
" +
                ""thresholds": {
" +
                ""1e-3": 65.3,
" +
                ""1e-5": 76.5,
" +
                ""1e-4": 71.8
" +
                "}
" +
                "}";
 Data data = gson.fromJson(json, Data.class);

最终得到的data就是我们要的实体类对象。

示例二：

有这样一个JSON需要解析，比如：

{
"category": [
"iOS",
"Android",
"瞎推荐",
"拓展资源",
"福利",
"休息视频"
],
"error": false,
"results": {
"Android": [
{
"_id": "56cc6d23421aa95caa707a69",
"createdAt": "2015-08-06T07:15:52.65Z",
"desc": "类似Link Bubble的悬浮式操作设计",
"publishedAt": "2015-08-07T03:57:48.45Z",
"type": "Android",
"url": "https://github.com/recruit-lifestyle/FloatingView",
"used": true,
"who": "mthli"
}
]
}
}

代码：

public class Data {
    public String[] category;
    public boolean error;
    public Results results;
}

public class Results {
    public Android []Android;
}

public class Android {
    public String _id;
    public String createdAt;
    public String desc;
    public String publishedAt;
    public String type;
    public String url;
    public boolean used;
    public String who;
}

Gson gson = new Gson();
String json = "{
" +
              "    "category": [
" +
              "        "iOS",
" +
              "        "Android",
" +
              "        "瞎推荐",
" +
              "        "拓展资源",
" +
              "        "福利",
" +
              "        "休息视频"
" +
              "    ],
" +
              "    "error": false,
" +
              "    "results": {
" +
              "        "Android": [
" +
              "            {
" +
              "                "_id": "56cc6d23421aa95caa707a69",
" +
              "                "createdAt": "2015-08-06T07:15:52.65Z",
" +
              "                "desc": "类似Link Bubble的悬浮式操作设计",
" +
              "                "publishedAt": "2015-08-07T03:57:48.45Z",
" +
              "                "type": "Android",
" +
              "                "url": "https://github.com/recruit-lifestyle/FloatingView",
" +
              "                "used": true,
" +
              "                "who": "mthli"
" +
              "            }
" +
              "        ]
" +
              "    }
" +
              "}";
Data data = gson.fromJson(json, Data.class);