httpclient4.X 设置代理请求（包含账号密码）[通俗易懂]

大家好，又见面了，我是你们的朋友全栈君。最近需要使用Httpclient做后台请求，使用的是httpclient4.3版本，apache网站上有，我这里就不提供下载链接了，搜一下就可以了，废话少说，直接上代码：

Java代码

import java.util.ArrayList;
import java.util.List;
import org.apache.http.HttpEntity;
import org.apache.http.HttpHost;
import org.apache.http.NameValuePair;
import org.apache.http.client.config.RequestConfig;
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.HttpClientBuilder;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
public class HttpClientTest {
public static void main(String args[]) throws Exception {
// 创建HttpClientBuilder
HttpClientBuilder httpClientBuilder = HttpClientBuilder.create();
// HttpClient
CloseableHttpClient closeableHttpClient = httpClientBuilder.build();
// 依次是目标请求地址，端口号,协议类型
HttpHost target = new HttpHost(“10.10.100.102:8080/mytest”, 8080,
“http”);
// 依次是代理地址，代理端口号，协议类型
HttpHost proxy = new HttpHost(“yourproxy”, 8080, “http”);
RequestConfig config = RequestConfig.custom().setProxy(proxy).build();
// 请求地址
HttpPost httpPost = new HttpPost(“http://10.10.100.102:8080/mytest”);
httpPost.setConfig(config);
// 创建参数队列
List<NameValuePair> formparams = new ArrayList<NameValuePair>();
// 参数名为pid，值是2
formparams.add(new BasicNameValuePair(“pid”, “2”));
UrlEncodedFormEntity entity;
try {
entity = new UrlEncodedFormEntity(formparams, “UTF-8”);
httpPost.setEntity(entity);
CloseableHttpResponse response = closeableHttpClient.execute(
target, httpPost);
// getEntity()
HttpEntity httpEntity = response.getEntity();
if (httpEntity != null) {
// 打印响应内容
System.out.println(“response:”
+ EntityUtils.toString(httpEntity, “UTF-8”));
}
// 释放资源
closeableHttpClient.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}

那么，如何设置代理服务器的用户名和密码？请看如下代码：

[java]
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HttpHost proxy = new HttpHost(“proxy”, 8080);
BasicScheme proxyAuth = new BasicScheme();
// Make client believe the challenge came form a proxy
proxyAuth.processChallenge(new BasicHeader(AUTH.PROXY_AUTH, “BASIC realm=default”));
BasicAuthCache authCache = new BasicAuthCache();
authCache.put(proxy, proxyAuth);
CredentialsProvider credsProvider = new BasicCredentialsProvider();
credsProvider.setCredentials(
new AuthScope(proxy),
new UsernamePasswordCredentials(“username”, “password”));
HttpClientContext context = HttpClientContext.create();
context.setAuthCache(authCache);
context.setCredentialsProvider(credsProvider);
CloseableHttpClient httpclient = HttpClients.createDefault();
try {
CloseableHttpResponse response = httpclient.execute(new HttpGet(“/stuff”), context);
try {
// …
} finally {
response.close();
}
} finally {
httpclient.close();
}

HttpHost proxy = new HttpHost("proxy", 8080);

BasicScheme proxyAuth = new BasicScheme();
// Make client believe the challenge came form a proxy
proxyAuth.processChallenge(new BasicHeader(AUTH.PROXY_AUTH, "BASIC realm=default"));
BasicAuthCache authCache = new BasicAuthCache();
authCache.put(proxy, proxyAuth);

CredentialsProvider credsProvider = new BasicCredentialsProvider();
credsProvider.setCredentials(
        new AuthScope(proxy),
        new UsernamePasswordCredentials("username", "password"));

HttpClientContext context = HttpClientContext.create();
context.setAuthCache(authCache);
context.setCredentialsProvider(credsProvider);

CloseableHttpClient httpclient = HttpClients.createDefault();
try {
    CloseableHttpResponse response = httpclient.execute(new HttpGet("/stuff"), context);
    try {
        // ...
    } finally {
        response.close();
    }
} finally {
    httpclient.close();
}

使用代理需要导入：commons-logging-1.1.jar，httpclient-4.0-beta2.jar ，httpcore-4.1-alpha1.jar 和 commons-codec-1.4.jar架包。在连接代理时需要使用用户名和密码构造UsernamePasswordCredentials对象并作为参数传递给HttpClient对象。

具体用法如下：

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public static void main(String args[])
{
StringBuffer sb = new StringBuffer();
//创建HttpClient实例
HttpClient client = getHttpClient();
//创建httpGet
HttpGet httpGet = new HttpGet(“http://www.csdn.net”);
//执行
try {
HttpResponse response = client.execute(httpGet);
HttpEntity entry = response.getEntity();
if(entry != null)
{
InputStreamReader is = new InputStreamReader(entry.getContent());
BufferedReader br = new BufferedReader(is);
String str = null;
while((str = br.readLine()) != null)
{
sb.append(str.trim());
}
br.close();
}
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println(sb.toString());
}
//设置代理
public static HttpClient getHttpClient() {
DefaultHttpClient httpClient = new DefaultHttpClient();
String proxyHost = “proxycn2.huawei.com”;
int proxyPort = 8080;
String userName = “china\\******”;
String password = “*******“
httpClient.getCredentialsProvider().setCredentials(
new AuthScope(proxyHost, proxyPort),
new UsernamePasswordCredentials(userName, password));
HttpHost proxy = new HttpHost(proxyHost,proxyPort);
httpClient.getParams().setParameter(ConnRouteParams.DEFAULT_PROXY, proxy);
return httpClient;
}

public static void main(String args[])
{
 StringBuffer sb = new StringBuffer();
 //创建HttpClient实例
 HttpClient client = getHttpClient();
 //创建httpGet
 HttpGet httpGet = new HttpGet("http://www.csdn.net");
 //执行
 try {
  HttpResponse response = client.execute(httpGet);
  
  HttpEntity entry = response.getEntity();
  
  if(entry != null)
  {
   InputStreamReader is = new InputStreamReader(entry.getContent());
   BufferedReader br = new BufferedReader(is);
   String str = null;
   while((str = br.readLine()) != null)
   {
    sb.append(str.trim());
   }
   br.close();
  }
  
 } catch (ClientProtocolException e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
 } catch (IOException e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
 }
 System.out.println(sb.toString());
}
//设置代理
public static HttpClient getHttpClient() {
 DefaultHttpClient httpClient = new DefaultHttpClient();
 String proxyHost = "proxycn2.huawei.com";
 int proxyPort = 8080;
 String userName = "china\\******";
 String password = "*******“
 httpClient.getCredentialsProvider().setCredentials(
   new AuthScope(proxyHost, proxyPort),
   new UsernamePasswordCredentials(userName, password));
 HttpHost proxy = new HttpHost(proxyHost,proxyPort);
 httpClient.getParams().setParameter(ConnRouteParams.DEFAULT_PROXY, proxy);
 return httpClient;
}

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