java调用webservice并解析json字段

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转载自：http://www.jb51.net/article/45025.htm

import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.io.Reader;import java.net.URL;import java.nio.charset.Charset;import org.json.JSONException;import org.json.JSONObject;/** * java根据url获取json对象 * @author openks * @since 2013-7-16 * 需要添加java-json.jar才能运行 */public class GetPlaceByIp {  private static String readAll(Reader rd) throws IOException {    StringBuilder sb = new StringBuilder();    int cp;    while ((cp = rd.read()) != -1) {      sb.append((char) cp);    }    return sb.toString();  }  public static JSONObject readJsonFromUrl(String url) throws IOException, JSONException {    InputStream is = new URL(url).openStream();    try {      BufferedReader rd = new BufferedReader(new InputStreamReader(is, Charset.forName("UTF-8")));      String jsonText = readAll(rd);      JSONObject json = new JSONObject(jsonText);      return json;    } finally {      is.close();     // System.out.println("同时 从这里也能看出 即便return了，仍然会执行finally的！");    }  }  public static void main(String[] args) throws IOException, JSONException {   //这里调用百度的ip定位api服务 详见 http://api.map.baidu.com/lbsapi/cloud/ip-location-api.htm    JSONObject json = readJsonFromUrl("http://api.map.baidu.com/location/ip?ak=F454f8a5efe5e577997931cc01de3974&ip=202.198.16.3");   if(json.has("target"))    {<pre name="code" class="java">    System.out.println(json.getString("target"));

}

System.out.println(json.toString()); //System.out.println(((JSONObject) json.get("content")).get("address")); }}

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