NO.19 HttpConnection、HttpClient使用注意点（附http连接工具：采用HttpClient支持代理Proxy、支持用户名密码、支持域Domain模式）

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我是靠谱客的博主爱笑裙子，最近开发中收集的这篇文章主要介绍NO.19 HttpConnection、HttpClient使用注意点（附http连接工具：采用HttpClient支持代理Proxy、支持用户名密码、支持域Domain模式），觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

【注意】2014-02-28 HttpConnectionUtils 升级了！

1. 基于Apache HttpClient4

2. 添加获取图片的方法

3. 支持https

4. 支持会话保持

详见：NO.91 SSLPeerUnverifiedException 问题之解决(附HttpClientUtils升级版)

与三方交互一般采用HttpConnection或HttpClient（推荐，功能强大适应性强），且一定要设置连接超时时间及读取超时时间两个参数：

HttpConnection设置两参数例子：

HttpConnection httpConnection= new HttpConnection();

httpConnection.setConnectTimeout(50 * 1000); // 打开连接时间等待超时50秒

httpConnection.setReadTimeout(300 * 1000); // 等待读取返回数据超时300秒

HttpClient设置两个参数的例子：

HttpClient httpClient = new HttpClient();

HttpConnectionManagerParams managerParams = httpClient

.getHttpConnectionManager().getParams();

// 设置连接的超时时间

managerParams.setConnectionTimeout(50 * 1000);

// 设置读取数据的超时时间

managerParams.setSoTimeout(300 * 1000);

附自写工具采用HttpClient支持代理Proxy、支持用户名密码、支持域Domain模式

package amosryan.util;

import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.IOException;
import java.io.InputStreamReader;

import org.apache.commons.httpclient.ConnectTimeoutException;
import org.apache.commons.httpclient.DefaultHttpMethodRetryHandler;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.HttpMethodBase;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.NTCredentials;
import org.apache.commons.httpclient.UsernamePasswordCredentials;
import org.apache.commons.httpclient.auth.AuthScope;
import org.apache.commons.httpclient.methods.EntityEnclosingMethod;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.methods.PostMethod;
import org.apache.commons.httpclient.params.HttpMethodParams;
//import org.apache.log4j.Logger;

/**
 * 建立Http连接的工具类
 * 
 * @author liuzhen
 * @since 2009-03-23
 * @version V1.2 将原静态实现改为实例实现，以便参数设置
 */
public class HttpConnectionUtils {

	// private static Logger logger =
	// Logger.getLogger(HttpConnectionUtils.class);

	/** 连接超时时间（默认3秒 3000ms） 单位毫秒（ms） */
	private int connectionTimeout = 3000;

	/** 读取数据超时时间（默认30秒 30000ms） 单位毫秒（ms） */
	private int soTimeout = 30000;

	/** 代理主机名 */
	private String proxyHostName;

	/** 代理端口 */
	private int proxyPort;

	/** 代理主机用户名 */
	private String proxyUser;

	/** 代理主机密码 */
	private String proxyPwd;

	/** 代理主机域 */
	private String proxyDomain;

	/** 字符集设置 */
	private String charset = "UTF-8";

	public String getProxyUser() {
		return proxyUser;
	}

	public void setProxyUser(String proxyUser) {
		this.proxyUser = proxyUser;
	}

	public String getProxyPwd() {
		return proxyPwd;
	}

	public void setProxyPwd(String proxyPwd) {
		this.proxyPwd = proxyPwd;
	}

	public String getProxyDomain() {
		return proxyDomain;
	}

	public void setProxyDomain(String proxyDomain) {
		this.proxyDomain = proxyDomain;
	}

	/**
	 * get方式连接
	 * 
	 * @param url
	 * @param postData
	 * @return
	 * @throws Exception
	 */
	public String doGet(String url) throws Exception {
		// 创建Get方法的实例
		GetMethod getMethod = new GetMethod(url);
		return doRequest(getMethod,null);
	}

	/**
	 * post方式连接
	 * 
	 * @param url
	 * @param postData
	 * @return
	 * @throws Exception
	 */
	public String doPost(String url, String postData) throws Exception {
		// 创建Post方法的实例
		PostMethod postMethod = new PostMethod(url);
		return doRequest(postMethod,postData);
	}
	
	private String doRequest(HttpMethodBase request, String postData) throws Exception {

		// 创建HttpClient实例
		HttpClient httpClient = new HttpClient();

		// 设置连接的超时时间5s
		httpClient.getHttpConnectionManager().getParams()
				.setConnectionTimeout(connectionTimeout);
		// 设置读取数据的超时时间8s
		httpClient.getHttpConnectionManager().getParams()
				.setSoTimeout(soTimeout);
		// 设置代理
		if (proxyHostName != null) {
			httpClient.getHostConfiguration()
					.setProxy(proxyHostName, proxyPort);
			// 代理需要认证
			if (proxyUser != null) {
				UsernamePasswordCredentials upc = null;
				if (proxyDomain != null) {// NTLM认证模式
					upc = new NTCredentials(proxyUser, proxyPwd, proxyHostName,
							proxyDomain);
				} else {// BASIC模式
					upc = new UsernamePasswordCredentials(proxyUser, proxyPwd);
				}
				httpClient.getState().setProxyCredentials(AuthScope.ANY, upc);
			}
		}
		// 使用系统提供的默认的恢复策略
		request.getParams().setParameter(HttpMethodParams.RETRY_HANDLER,
				new DefaultHttpMethodRetryHandler());
		if(postData!=null){
			// 设置发送的内容
			((PostMethod)request).setRequestBody(postData);
			// 对发送的内容长度进行设定
			if (postData.length() < Integer.MAX_VALUE) {
				((PostMethod)request).setRequestContentLength(postData.length());
			} else {
				((PostMethod)request)
						.setRequestContentLength(EntityEnclosingMethod.CONTENT_LENGTH_CHUNKED);
			}
		}
		// 指定请求内容的类型
		request.setRequestHeader("Content-type", "text/xml; charset="
				+ charset);
		BufferedReader reader = null;
		String backString = null;
		try {
			// 执行post方法
			int statusCode = httpClient.executeMethod(request);
			if (statusCode != HttpStatus.SC_OK) {// 如果连接正常，获得返回内容
				throw new Exception("连接失败");
			}
			reader = new BufferedReader(new InputStreamReader(
					request.getResponseBodyAsStream(), charset));

			String line = null;
			StringBuffer buffered = new StringBuffer();
			while ((line = reader.readLine()) != null) {
				buffered.append(line);
			}
			backString = buffered.toString();
		} catch (HttpException e) {// 发生致命的异常，可能是协议不对或者返回的内容有问题
//			logger.info("Please check your provided http address!");
			e.printStackTrace();
			throw e;
		} catch (ConnectTimeoutException e) {
			e.printStackTrace();
			throw e;
		} catch (IOException e) {// 发生网络异常
			e.printStackTrace();
			throw e;
		} finally {// 关闭输入输出流,释放连接
			if (reader != null) {
				reader.close();
			}
			request.releaseConnection();
		}
		return backString;
	}

	/**
	 * 获取连接超时时间 单位毫秒（ms）
	 * 
	 * @return
	 */
	public int getConnectionTimeout() {
		return connectionTimeout;
	}

	public void setConnectionTimeout(int connectionTimeout) {
		this.connectionTimeout = connectionTimeout;
	}

	public String getProxyHostName() {
		return proxyHostName;
	}

	public void setProxyHostName(String proxyHostName) {
		this.proxyHostName = proxyHostName;
	}

	public int getProxyPort() {
		return proxyPort;
	}

	public void setProxyPort(int proxyPort) {
		this.proxyPort = proxyPort;
	}

	public int getSoTimeout() {
		return soTimeout;
	}

	public void setSoTimeout(int soTimeout) {
		this.soTimeout = soTimeout;
	}

	public String getCharset() {
		return charset;
	}

	public void setCharset(String charset) {
		this.charset = charset;
	}
	
	

}