android - 使用 Gson 解析 JSON 文件

Question

我有一个获取最强 Wifi 接入点信号的方法，avialabe 是并返回 SSID 字符串，所有这些 SSID 字符串都存储在 JSON 文件中的原始文件夹中:How can I access the file in the raw folder and parse如果 SSID“FR WLAN”是，它与 Gson 一起获取例如 route_number 6？

ssid_number JSON 文件:

{
    "data": [
        {
            "ssid": "KD Privat",
            "route_number": 1
        },
        {
            "ssid": "KD WLAN Hotspot",
            "route_number": 4
        },
        {
            "ssid": "FR WLAN",
            "route_number": 6
        }
    ]
}

WifiJSON 类:

public class WifiJSON {
    private String ssid;
    private int route_number;

    public WifiJSON(String ssid, int route_number) {
        this.ssid = ssid;
        this.route_number = route_number;

    }

    private String getSsid() {
        return ssid;
    }

    private void setSsid(String ssid) {
        this.ssid = ssid;
    }

    private int getRoute_number() {
        return route_number;
    }

    private void setRoute_number(int route_number) {
        this.route_number = route_number;
    }

    @Override
    public String toString() {
        return "WifiJSON [ssid=" + ssid + ", route_number=" + route_number
                + "]";
    }



}

在 MainActivity 中解析 SSID:

             //parse the storeed json file"ssid_number" and get the route_number back.
        private int parse_SSID(String route_string) {
            // TODO Auto-generated method stub
            InputStream is = getResources().openRawResource(R.raw.ssid_number);
            Gson gson = new Gson();
            WifiJSON obj = gson.fromJson(route_string, WifiJSON.class);


            return 0;
        }
    }

WiFiJSONList 类:

import java.util.ArrayList;

public class WiFiJSONList {
	private ArrayList<WifiJSON> data;

	public ArrayList<WifiJSON> getWifiList() {
	    return data;
	}

	public void setWifiList(ArrayList<WifiJSON> wifiList) {
	    this.data = wifiList;
	}
}

Answer 1

我试过你的代码，并做了一些修改。这对我有用。为了检查目的，我硬编码了 json 字符串。您可以从 raw 或 assets 文件夹中读取并继续。

    private int parse_SSID(String route_string) {
    // TODO Auto-generated method stub
    Gson gson = new Gson();
    WiFiJSONList obj = gson.fromJson(route_string, WiFiJSONList.class);
    //Now iterate through the list
    List<WiFiJSON> wifijson = obj.getWifiList();
    Iterator iterator = wifijson.iterator();
    while (iterator.hasNext()) {
        WiFiJSON wifielement = (WiFiJSON) iterator.next();
        System.out.println(wifielement.getSsid() + "----" + wifielement.getRoute_number());
    }
    return 0;
}

用法会是这样:(其实在用gson解析json的时候，你的json字符串应该是一个单独的对象，而不是直接像一个数组。)

String json = "{\"data\": [{\"ssid\": \"KD Privat\",\"route_number\": 1},{\"ssid\": \"KD WLAN Hotspot\",\"route_number\": 4},{\"ssid\": \"FR WLAN\",\"route_number\": 6}]}";
    parse_SSID(json);


public class WiFiJSON {

private String ssid;
private int route_number;

public String getSsid() {
    return ssid;
}
public void setSsid(String ssid) {
    this.ssid = ssid;
}
public int getRoute_number() {
    return route_number;
}
public void setRoute_number(int route_number) {
    this.route_number = route_number;
}

public class WiFiJSONList {

private ArrayList<WiFiJSON> data;

public ArrayList<WiFiJSON> getWifiList() {
    return data;
}

public void setWifiList(ArrayList<WiFiJSON> wifiList) {
    this.data = wifiList;
}

让我知道这是否有效。