JAVA的JSON示例

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在ECLIPSE中的某个工程使用json，需要导入额外的json包，比如json-20090211.jar。从网上下到这个库之后，放到工程目录下，在project导入的方法是：点击工程右键-》属性-》Java build path-》libraries，再点击右边的add external JARs，选中刚才放置的Jar包就可以了。

比如如下的工程，从网站地理位置数据中返回特定数据

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

执行结果是

{"content":{"point":{"y":"5419815.34","x":"13950002.65"},"address":"吉林省长春市","address_detail":{"street":"","province":"吉林省","city_code":53,"street_number":"","district":"","city":"长春市"}},"status":0,"address":"CN|吉林|长春|None|CERNET|0|0"}吉林省长春市

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另外有遇到这样的写法 (不知道对不对):

static private String weater_url = "http://www.weather.com.cn/data/sk/101010100.html";

URL req_url = new URL(weater_url);

HttpURLConnection urlConn = (HttpURLConnection)req_url.openConnection();

urlConn.setConnectTimeout(5*1000);
urlConn.connect();

//if(urlConn.getResponseCode() == HTTP_200)
               {
                    BufferedReader reader = new BufferedReader (new InputStreamReader(urlConn.getInputStream(),"utf-8"));
               //   Log.v(TAG,"reader= "+ reader);
               }

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