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如何在java中解析JSON_Java_Android - Fatal编程技术网

如何在java中解析JSON

如何在java中解析JSON,java,android,Java,Android,我一直在使用org.JSON解析Java中的JSON。我的JSON看起来像这样 [{"id" : "1", "type" : "City", "description" : [ "short_description" : "some data", "long_description" : "some data", "postal_code" : "49045", "po

我一直在使用org.JSON解析Java中的JSON。我的JSON看起来像这样

[{"id" : "1",
  "type" : "City",
  "description" : [ "short_description" : "some data",
                    "long_description" : "some data",
                    "postal_code" : "49045",
                    "population" : "900000",
                  ],
     }
 ],
如何解析标记描述的元素,例如long_description?

使用,您只需将其作为库添加到现有项目中,然后执行以下操作:

数据(JSON):

{'foo':'bar','coolness':2.0,'高度':39000,'飞行员':{'firstName':'Buzz','lastName':'Aldrin'},'任务':'apollo 11'}

解析数据的代码:

import java.io.InputStream;

import net.sf.json.JSONObject;
import net.sf.json.JSONSerializer;

import org.apache.commons.io.IOUtils;

public class JsonParsing {

    public static void main(String[] args) throws Exception {
        InputStream is = 
                JsonParsing.class.getResourceAsStream( "sample-json.txt");
        String jsonTxt = IOUtils.toString( is );

        JSONObject json = (JSONObject) JSONSerializer.toJSON( jsonTxt );        
        double coolness = json.getDouble( "coolness" );
        int altitude = json.getInt( "altitude" );
        JSONObject pilot = json.getJSONObject("pilot");
        String firstName = pilot.getString("firstName");
        String lastName = pilot.getString("lastName");

        System.out.println( "Coolness: " + coolness );
        System.out.println( "Altitude: " + altitude );
        System.out.println( "Pilot: " + lastName );
    }
}
参考文献:

JSONArray值=新的JSONArray(您的字符串);
对于(int i=0;i
您可以在不使用库的情况下执行此操作-

try  {
    JSONTokener tokener = new JSONTokener(yourString);
    JSONObject jsonObj = (JSONObject) tokener.nextValue();
    String output = jsonObj.getString("streamUrl");
} catch (JSONException e) {
    Log.v("Logtag", "Problem in decoding json");
    e.printStackTrace();
}
看看这篇文章:参考上一篇文章
try  {
    JSONTokener tokener = new JSONTokener(yourString);
    JSONObject jsonObj = (JSONObject) tokener.nextValue();
    String output = jsonObj.getString("streamUrl");
} catch (JSONException e) {
    Log.v("Logtag", "Problem in decoding json");
    e.printStackTrace();
}
 //import java.util.ArrayList;
 //import org.bson.Document;


 Document root = Document.parse("{ \"foo\" : \"bar\", \"coolness\" : 2.0, \"altitude\" : 39000, \"pilot\" : { \"firstName\" : \"Buzz\", \"lastName\" : \"Aldrin\" }, \"mission\" : \"apollo 11\" }");

 System.out.println(((String)root.get("foo")));
 System.out.println((root.get("coolness")));
 System.out.println((root.get("altitude")));
 System.out.println(((String)((Document)root.get("pilot")).get("firstName")));
 System.out.println(((String)((Document)root.get("pilot")).get("lastName")));
 System.out.println(((String)root.get("mission")));