java，访问一个接口，然后得到接口的返回JSON

spring mvc 的话，这样：
/**
     * 测试返回JSON数据
     * @param session
     * @return
     */
    @RequestMapping(value="/test")
    @ResponseBody
    public Object test(HttpSession session){

        return session.getAttribute("permit");
    }

用class类，直接控制台执行，访问网址，然后得到返回值，我这有一个C#的，要和他类似的java的代码，求例子： private string doSendMessage(string wx_username, string wx_token, string fake_id, string content)
        {
            string sURL = "http://gxyweixin.duapp.com/SendMessage?";
            string param = String.Format("name={0}&password={1}&fakeid={2}&content={3}", wx_username, wx_token, fake_id, HttpUtility.UrlEncode(content));
            byte[] bs = Encoding.ASCII.GetBytes(param);            HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(sURL);
            request.Method = "POST";
            request.ContentType = "application/x-www-form-urlencoded";
            request.ContentLength = bs.Length;
            Stream reqStream = request.GetRequestStream();
            reqStream.Write(bs, 0, bs.Length);            Stream objStream = request.GetResponse().GetResponseStream();
            StreamReader objReader = new StreamReader(objStream);            string response_data = objReader.ReadToEnd();            request = null;
            textpost.Text = stringify(response_data);
            return stringify(response_data);
        }

一个简略的例子：package com.ljn.base;import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;/**
* @author lijinnan
* @date:2013-11-11 下午6:12:26
*/
public class HttpJSONTest {    /**
     * @param args
     */
    public static void main(String[] args) {
        String url = "http://api.geonames.org/citiesJSON?north=44.1&south=-9.9&east=-22.4&west=55.2&lang=de&username=demo";
        String json = loadJSON(url);
        System.out.println(json);
    }    public static String loadJSON (String url) {
        StringBuilder json = new StringBuilder();
        try {
            URL oracle = new URL(url);
            URLConnection yc = oracle.openConnection();
            BufferedReader in = new BufferedReader(new InputStreamReader(
                                        yc.getInputStream()));
            String inputLine = null;
            while ( (inputLine = in.readLine()) != null) {
                json.append(inputLine);
            }
            in.close();
        } catch (MalformedURLException e) {
        } catch (IOException e) {
        }
        return json.toString();
    }
}

通过jsp或servlet可以轻松实现，servlet获取打印流，out.print();上两周写的获取网络视频源地址，输入视频播放地址就可获取视频源地址，可直接下载。
比如腾讯视频：http://v.qq.com/cover/j/jowk63wbewcbatz.html
在浏览器敲如下地址：
http://60.206.40.187:8080/hynet_video/1/getVideoResource?pageUrl=http://v.qq.com/cover/j/jowk63wbewcbatz.html返回JSON字符串：{"resourceURL":"http://124.193.165.207/vlive.qqvideo.tc.qq.com/j0013becfin.mp4?vkey=488EFCE405EDD37E356562D686FD10F1312DED60186FA4B74CF3B87AA9E3099EA13DC7B9CB819426&br=66&platform=1&fmt=mp4&level=3","requestURL":"http://v.qq.com/cover/j/jowk63wbewcbatz.html"}

我测试了一下用我要用的借口，但是在 BufferedReader in = new BufferedReader(new InputStreamReader(yc.getInputStream()));这里直接弹出来了

刚回复错了我测试了一下用我要用的借口，但是在 BufferedReader in = new BufferedReader(new InputStreamReader(yc.getInputStream()));这里直接弹出来了

在 BufferedReader in = new BufferedReader(new InputStreamReader(yc.getInputStream()));这里直接弹出来了
报什么错？我测试楼上的是可以的。{"geonames":[{"fcodeName":"capital of a political entity","toponymName":"Mexico City","countrycode":"MX","fcl":"P","fclName":"city, village,...","name":"Mexiko-Stadt","wikipedia":"en.wikipedia.org/wiki/Mexico_City","lng":-99.12766456604,"fcode":"PPLC","geonameId":3530597,"lat":19.428472427036,"population":12294193},{"fcodeName":"capital of a political entity","toponymName":"Manila","countrycode":"PH","fcl":"P","fclName":"city, village,...","name":"Manila","wikipedia":"en.wikipedia.org/wiki/Manila","lng":120.9822,"fcode":"PPLC","geonameId":1701668,"lat":14.6042,"population":10444527},{"fcodeName":"capital of a political entity","toponymName":"Dhaka","countrycode":"BD","fcl":"P","fclName":"city, village,...","name":"Dhaka","wikipedia":"en.wikipedia.org/wiki/Dhaka","lng":90.40743827819824,"fcode":"PPLC","geonameId":1185241,"lat":23.710395616597037,"population":10356500},{"fcodeName":"capital of a political entity","toponymName":"Seoul","countrycode":"KR","fcl":"P","fclName":"city, village,...","name":"Seoul","wikipedia":"en.wikipedia.org/wiki/Seoul","lng":126.977834701538,"fcode":"PPLC","geonameId":1835848,"lat":37.5682561388953,"population":10349312},{"fcodeName":"capital of a political entity","toponymName":"Jakarta","countrycode":"ID","fcl":"P","fclName":"city, village,...","name":"Jakarta","wikipedia":"en.wikipedia.org/wiki/Jakarta","lng":106.84513092041016,"fcode":"PPLC","geonameId":1642911,"lat":-6.214623197035775,"population":8540121},{"fcodeName":"capital of a political entity","toponymName":"Tokyo","countrycode":"JP","fcl":"P","fclName":"city, village,...","name":"Tokio","wikipedia":"en.wikipedia.org/wiki/Tokyo","lng":139.69171,"fcode":"PPLC","geonameId":1850147,"lat":35.6895,"population":8336599},{"fcodeName":"capital of a political entity","toponymName":"Taipei","countrycode":"TW","fcl":"P","fclName":"city, village,...","name":"Taipeh","wikipedia":"en.wikipedia.org/wiki/Taipei_Railway_Station","lng":121.531846,"fcode":"PPLC","geonameId":1668341,"lat":25.047763,"population":7871900},{"fcodeName":"capital of a political entity","toponymName":"Bogotá","countrycode":"CO","fcl":"P","fclName":"city, village,...","name":"Bogotá","wikipedia":"en.wikipedia.org/wiki/Bogot%C3%A1","lng":-74.08175468444824,"fcode":"PPLC","geonameId":3688689,"lat":4.609705849789108,"population":7674366},{"fcodeName":"capital of a political entity","toponymName":"Beijing","countrycode":"CN","fcl":"P","fclName":"city, village,...","name":"Peking","wikipedia":"en.wikipedia.org/wiki/Beijing","lng":116.397228240967,"fcode":"PPLC","geonameId":1816670,"lat":39.9074977414405,"population":7480601},{"fcodeName":"capital of a political entity","toponymName":"Hong Kong","countrycode":"HK","fcl":"P","fclName":"city, village,...","name":"Hong Kong","wikipedia":"en.wikipedia.org/wiki/Hong_Kong","lng":114.157691001892,"fcode":"PPLC","geonameId":1819729,"lat":22.2855225817732,"population":7012738}]}

调试易

java，访问一个接口，然后得到接口的返回JSON

解决方案 »