Java进阶(三十一) Web服务调用

前言

      有朋友问了一个问题:如何调用已知的音乐服务接口，服务文档如下:

      https://www.evernote.com/shard/s744/sh/c37cd503-68fc-4406-b8f2-5e90095be303/19b67e36aa2ccd19

      查看代码之后，按照以往的服务调用方法实现，结果无法实现。很是费解，求教大师兄之后，问题，迎刃而解，只能说自己需要学习的地方还有很多。

     完整代码如下：

      package plan.http.util;
      import java.io.IOException;
      import java.io.UnsupportedEncodingException;
      import java.util.ArrayList;
      import java.util.List;
      import org.apache.http.HttpEntity;
      import org.apache.http.NameValuePair;
      import org.apache.http.client.ClientProtocolException;
      import org.apache.http.client.entity.UrlEncodedFormEntity;
      import org.apache.http.client.methods.CloseableHttpResponse;
      import org.apache.http.client.methods.HttpPost;
      import org.apache.http.impl.client.CloseableHttpClient;
      import org.apache.http.impl.client.HttpClients;
      import org.apache.http.message.BasicNameValuePair;
      import org.apache.http.util.EntityUtils;
      public class HttpClientUtil {
      public static void main(String[] args) throws Exception {
      HttpClientUtil.getByHttpPost();
      }
      public static String getByHttpPost() throws Exception {
      // 1.创建HttpClient对象。(创建默认的httpClient实例.)
      CloseableHttpClient httpclient = HttpClients.createDefault();
      // 首页
      String indexStr = "http://music-download.dev.fotoable.net/musics/lists";
      // 搜索
      String searchStr = "http://music-download.dev.fotoable.net/public/search";
      // 2.创建请求方法的实例，并指定请求URL。如果需要发送GET请求，创建HttpGet对象；如果需要发送POST请求，创建HttpPost对象。(创建httppost)
      HttpPost httppost = new HttpPost(searchStr);
      List<NameValuePair> formparams = new ArrayList<NameValuePair>();
      // 3.如果需要发送请求参数，可调用HttpGet、HttpPost共同的setParams(HetpParams params)方法来添加请求参数；
      // 对于HttpPost对象而言，也可调用setEntity(HttpEntity entity)方法来设置请求参数。
      // 关键词搜索传参(创建参数队列)
      formparams.add(new BasicNameValuePair("keyword", "See you again"));
      // formparams.add(new BasicNameValuePair("pwd", "123"));
      UrlEncodedFormEntity uefEntity;
      try {
      uefEntity = new UrlEncodedFormEntity(formparams, "UTF-8");
      httppost.setHeader("User-Agent","Mozilla/5.0 (Windows NT 10.0; WOW64; rv:41.0) Gecko/20100101 Firefox/41.0");
      httppost.setHeader("Connection", "keep-alive");
      httppost.setHeader("Accept-Language","zh-CN,zh;q=0.8,en-US;q=0.5,en;q=0.3");
      httppost.setHeader("Accept-Encoding", "gzip, deflate");
      httppost.setHeader("Accept","text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");
      httppost.setHeader("JSESSIONID","536020F424630F22DB1F4EAEAD8E83BD");
      httppost.setEntity(uefEntity);
      System.out.println("executing request " + httppost.getURI());
      // 4.调用HttpClient对象的execute(HttpUriRequest request)发送请求，该方法返回一个HttpResponse。
      CloseableHttpResponse response = httpclient.execute(httppost);
      try {
      HttpEntity entity = response.getEntity();
      if (entity != null) {
      System.out.println("--------------------------------------");
      System.out.println("Response content: "	+ EntityUtils.toString(entity, "UTF-8"));
      System.out.println("--------------------------------------");
      }
      } finally {
      response.close();
      }
      } catch (ClientProtocolException e) {
      e.printStackTrace();
      } catch (UnsupportedEncodingException e1) {
      e1.printStackTrace();
      } catch (IOException e) {
      e.printStackTrace();
      } finally {
      try {
      // 5. 释放连接。无论执行方法是否成功，都必须释放连接
      httpclient.close();
      } catch (IOException e) {
      e.printStackTrace();
      }
      }
      return null;
      }
      }
  
 

参考文献

      http://blog.csdn.net/wangpeng047/article/details/19624529

感触

      自己还是应该多多学习才是，遇到了问题不要紧，要懂得回过头来认真总结，学习。这样才能不断进步。

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文章来源: shq5785.blog.csdn.net，作者：No Silver Bullet，版权归原作者所有，如需转载，请联系作者。

原文链接：shq5785.blog.csdn.net/article/details/51751467