java模拟http get和post 提交

使用httpclient工具包commons-httpclient-3.1.jar，依赖commons-logging-1.0.4.jar和commons-codec-1.3.jar。 

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

import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpMethod;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.URIException;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.methods.PostMethod;
import org.apache.commons.httpclient.params.HttpMethodParams;
import org.apache.commons.httpclient.util.URIUtil;

/**
 * 
 * 
 * <p>Title:HttpTookitEnhance</p>
 * <p>Description: httpclient模拟http请求，解决返回内容乱码问题</p>
 * <p>Copyright: Copyright (c) 2010</p>
 * <p>Company: </p>
 * @author libin
 * @version 1.0.0
 */
public class HttpTookitEnhance
{
      /** 
       * 执行一个HTTP GET请求，返回请求响应的HTML 
       * 
       * @param url                 请求的URL地址 
       * @param queryString 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 doGet ( String url, String queryString, String charset, boolean pretty )
      {
            StringBuffer response = new StringBuffer();
            HttpClient client = new HttpClient();
            HttpMethod method = new GetMethod(url);
            try
            {
                  if ( queryString != null && !queryString.equals("") )
                        //对get请求参数做了http请求默认编码，好像没有任何问题，汉字编码后，就成为%式样的字符串 
                        method.setQueryString(URIUtil.encodeQuery(queryString));
                  client.executeMethod(method);
                  if ( method.getStatusCode() == HttpStatus.SC_OK )
                  {
                        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 ( URIException e )
            {
            }
            catch ( IOException e )
            {
            }
            finally
            {
                  method.releaseConnection();
            }
            return response.toString();
      }

      /** 
       * 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 doPost ( String url, Map<String, String> 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<String, String> entry : params.entrySet() )
                  {
                        p.setParameter(entry.getKey(), entry.getValue());
                  }
                  method.setParams(p);
            }
            try
            {
                  client.executeMethod(method);
                  if ( method.getStatusCode() == HttpStatus.SC_OK )
                  {
                        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 )
            {
            }
            finally
            {
                  method.releaseConnection();
            }
            return response.toString();
      }

      public static void main ( String [] args )
      {
            String y = doGet("http://video.sina.com.cn/life/tips.html", null, "GBK", true);
            System.out.println(y);
      }

}