httpclient的get和post请求

package    com.tw.url.util;

import    java.io.BufferedReader;
import    java.io.IOException;
import    java.io.InputStreamReader;
import    java.util.Map;

import    org.apache.commons.httpclient.DefaultHttpMethodRetryHandler;
import    org.apache.commons.httpclient.Header;
import    org.apache.commons.httpclient.HttpClient;
import    org.apache.commons.httpclient.HttpException;
import    org.apache.commons.httpclient.HttpMethod;
import    org.apache.commons.httpclient.HttpStatus;
import    org.apache.commons.httpclient.methods.GetMethod;
import    org.apache.commons.httpclient.methods.PostMethod;
import    org.apache.commons.httpclient.params.HttpMethodParams;

/**
 *
 * HTTP公用类
 *  所需包:Commons-httpclient.jar,commons-codec-1.3.jar
 * 学习参见网址: https://www.ibm.com/developerworks/cn/opensource/os-cn-crawler/
 *
 *
 * @author tw 2009-07-16
 *
 */
public     class    HttpClientUtils {


     public     static     void    main(String arg[]) throws    Exception {
        String url =  "https://www.99bill.com/webapp/receiveDrawbackAction.do"  ;
         //getDoGetURL2(url,"utf-8");//测试ok
         //getDoGetURL(url,"utf-8");//测试ok
        getDoPostResponseDataByURL(url,  null   ,  "utf-8"  ,  true   );  //测试ok
    }

     /**
     * httpClient的get请求方式
     * @param url = "https://www.99bill.com/webapp/receiveDrawbackAction.do";
     * @param charset = ="utf-8";
     * @return
     * @throws Exception
     */
     public     static    String getDoGetURL(String url, String charset) throws    Exception {

        HttpClient client =  new    HttpClient();
        GetMethod method1 =  new    GetMethod(url);

         if    ( null    == url || !url.startsWith( "http"  )) {
             throw     new    Exception( "请求地址格式不对"  );
        }

         // 设置请求的编码方式
         if    ( null    != charset) {
            method1.addRequestHeader( "Content-Type"  ,
                     "application/x-www-form-urlencoded; charset="   + charset);
        }  else    {
            method1.addRequestHeader( "Content-Type"  ,
                     "application/x-www-form-urlencoded; charset="   +  "utf-8"  );
        }
         int    statusCode = client.executeMethod(method1);

         if    (statusCode != HttpStatus.SC_OK) { // 打印服务器返回的状态
            System.out.println( "Method failed: "   + method1.getStatusLine());
        }
         // 返回响应消息
         byte   [] responseBody = method1.getResponseBodyAsString().getBytes(method1.getResponseCharSet());
         // 在返回响应消息使用编码(utf-8或gb2312)
        String response =  new    String(responseBody,  "utf-8"  );
        System.out.println( "------------------response:"  +response);
         // 释放连接
        method1.releaseConnection();
         return    response;
    }


     /**
     * httpClient的get请求方式2
     * @param url = "https://www.99bill.com/webapp/receiveDrawbackAction.do";
     * @param charset = ="utf-8";
     * @return
     * @throws Exception
     */
     public     static    String getDoGetURL2(String url, String charset)
             throws    Exception {
         /*
         * 使用 GetMethod 来访问一个 URL 对应的网页,实现步骤:
         * 1:生成一个 HttpClinet 对象并设置相应的参数。
         * 2:生成一个 GetMethod 对象并设置响应的参数。
         * 3:用 HttpClinet 生成的对象来执行 GetMethod 生成的Get 方法。
         * 4:处理响应状态码。
         * 5:若响应正常，处理 HTTP 响应内容。
         * 6:释放连接。
         */

         /* 1 生成 HttpClinet 对象并设置参数 */
        HttpClient httpClient =  new    HttpClient();
         // 设置 Http 连接超时为5秒
        httpClient.getHttpConnectionManager().getParams().setConnectionTimeout( 5000  );

         /* 2 生成 GetMethod 对象并设置参数 */
        GetMethod getMethod =  new    GetMethod(url);
         // 设置 get 请求超时为 5 秒
        getMethod.getParams().setParameter(HttpMethodParams.SO_TIMEOUT,  5000  );
         // 设置请求重试处理，用的是默认的重试处理：请求三次
        getMethod.getParams().setParameter(HttpMethodParams.RETRY_HANDLER, new    DefaultHttpMethodRetryHandler());

        String response = ""  ;
         /* 3 执行 HTTP GET 请求 */
         try    {
             int    statusCode = httpClient.executeMethod(getMethod);
             /* 4 判断访问的状态码 */
             if    (statusCode != HttpStatus.SC_OK) {
                System.err.println( "Method failed: "  + getMethod.getStatusLine());
            }

             /* 5 处理 HTTP 响应内容 */
             // HTTP响应头部信息，这里简单打印
            Header[] headers = getMethod.getResponseHeaders();
             for    (Header h : headers)
                System.out.println(h.getName() +  "------------ "   + h.getValue());

             // 读取 HTTP 响应内容，这里简单打印网页内容
             byte   [] responseBody = getMethod.getResponseBody(); // 读取为字节数组
            response =  new    String(responseBody, charset);
            System.out.println( "----------response:"  +response);

             // 读取为 InputStream，在网页内容数据量大时候推荐使用
             //InputStream response = getMethod.getResponseBodyAsStream();

        }  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
            System.out.println( "Please check your provided http address!"  );
            e.printStackTrace();
        }  catch    (IOException e) {
             // 发生网络异常
            e.printStackTrace();
        }  finally    {
             /* 6 .释放连接 */
            getMethod.releaseConnection();
        }
         return    response;
    }

     /**
     * 执行一个HTTP POST请求，返回请求响应的HTML
     *
     * @param url       请求的URL地址
     * @param params    请求的查询参数,可以为null
     * @param charset   字符集
     * @param pretty    是否美化
     * @return          返回请求响应的HTML
     */
     public     static    String getDoPostResponseDataByURL(String url,
            Map params, String charset,  boolean    pretty) {

        StringBuffer response =  new    StringBuffer();

        HttpClient client =  new    HttpClient();
        HttpMethod method =  new    PostMethod(url);

         //设置Http Post数据
         if    (params !=  null   ) {
            HttpMethodParams p =  new    HttpMethodParams();
             for    (Map.Entry entry : params.entrySet()) {
                p.setParameter(entry.getKey(), entry.getValue());
            }
            method.setParams(p);
        }
         try    {
            client.executeMethod(method);
             if    (method.getStatusCode() == HttpStatus.SC_OK) {
                 //读取为 InputStream，在网页内容数据量大时候推荐使用
                BufferedReader reader =  new    BufferedReader(
                         new    InputStreamReader(method.getResponseBodyAsStream(),
                                charset));
                String line;
                 while    ((line = reader.readLine()) !=  null   ) {
                     if    (pretty)
                        response.append(line).append(System.getProperty( "line.separator"  ));
                     else
                        response.append(line);
                }
                reader.close();
            }
        }  catch    (IOException e) {
            System.out.println( "执行HTTP Post请求"   + url +  "时，发生异常！"  );
            e.printStackTrace();
        }  finally    {
            method.releaseConnection();
        }
        System.out.println( "--------------------"  +response.toString());
         return    response.toString();
    }


}