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。

美文美图