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）

【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5shttpClient.getHttpConnectionManager().getParams().setConnectionTimeout(connectionTimeout);// 设置读取数据的超时时间8shttpClient.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;}}