httpClient发送post请求

package com.yystar.sb2ph.utility;

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

import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.methods.PostMethod;
import org.apache.commons.httpclient.params.HttpMethodParams;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

public class HttpUtility {
    
    private static Log log = LogFactory.getLog(HttpUtility.class);
    
    public static String sendPostRequest(String url){
        return sendPostRequest(url,null);
    }
    
    public static String sendPostRequest(String url,Map<String, String> postParam){
        // Create an instance of HttpClient.
        HttpClient client = new HttpClient();
        client.getParams().setParameter(HttpMethodParams.HTTP_CONTENT_CHARSET,"utf-8");  
        
        // Create a method instance.
        PostMethod method = new PostMethod(url);
        
        if(postParam != null && postParam.size() != 0){
            for (String param : postParam.keySet()) {
                method.setParameter(param, postParam.get(param));
            }
        }
        
        // Provide custom retry handler is necessary
        //method.getParams().setParameter(HttpMethodParams.RETRY_HANDLER, new DefaultHttpMethodRetryHandler(3, false));

        try {
            // Execute the method.
            long time = System.currentTimeMillis();
            int statusCode = client.executeMethod(method);
            time = System.currentTimeMillis() - time;
            
            log.info("["+url+"] process time: " + time + " ms");

            if (statusCode != HttpStatus.SC_OK) {
                log.error("Method failed: " + method.getStatusLine());
            }

            // Read the response body.
            byte[] responseBody = method.getResponseBody();

            // Deal with the response.
            // Use caution: ensure correct character encoding and is not binary
            // data
            return new String(responseBody);

        } catch (HttpException e) {
            log.error("Fatal protocol violation: " + e.getMessage());
            e.printStackTrace();
        } catch (IOException e) {
            log.error("Fatal transport error: " + e.getMessage());
            e.printStackTrace();
        } finally {
            // Release the connection.
            method.releaseConnection();
        }
        return null;
    }
    
}