Java发送HTTP的Get和Post请求

package net.radar.util;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
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.NameValuePair;
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.methods.RequestEntity;
import org.apache.commons.httpclient.methods.StringRequestEntity;
import org.apache.commons.httpclient.params.HttpMethodParams;
import org.apache.commons.httpclient.util.URIUtil;
import org.apache.commons.lang.StringUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;


/**
 * 工具类 - Http模拟工具类
 */

public class HttpUtil { 
        private static Log log = LogFactory.getLog(HttpUtil.class); 

        /** 
         * 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 
         * @return 返回请求响应的HTML 
         */ 
        public static String doGet(String url, String queryString) { 
                String response = null; 
                HttpClient client = new HttpClient();  
                HttpMethod method = new GetMethod(url); 
                try { 
                        if (StringUtils.isNotBlank(queryString)) 
                                method.setQueryString(URIUtil.encodeQuery(queryString)); 
                        client.executeMethod(method); 
                        if (method.getStatusCode() == HttpStatus.SC_OK) { 
                                response = method.getResponseBodyAsString(); 
                        } 
                } catch (URIException e) { 
                        log.error("执行HTTP Get请求时，编码查询字符串“" + queryString + "”发生异常！", e); 
                } catch (IOException e) { 
                        log.error("执行HTTP Get请求" + url + "时，发生异常！", e); 
                } finally { 
                        method.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 
         * @return 返回请求响应的HTML 
         */ 
        public static String doPost(String url, Map<String, String> params) { 
                String response = null; 
                HttpClient client = new HttpClient(); 
                PostMethod method = new PostMethod(url); 
                method.getParams().setParameter(HttpMethodParams.HTTP_CONTENT_CHARSET,"UTF-8"); 
                //method.addRequestHeader("Content-Type", "text/html; charset=UTF-8"); 
                method.getParams().setContentCharset("UTF-8");
                
                try { 
                    //设置Http Post数据 
                    if (params != null) { 
                            HttpMethodParams p = new HttpMethodParams();
                            List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
                           
                            for (Map.Entry<String, String> entry : params.entrySet()) { 
                                p.setParameter(entry.getKey(), entry.getValue()); 
//                                nameValuePairs.add(new NameValuePair(entry.getKey(),entry.getValue()));
                                
                                method.addParameter(entry.getKey(), entry.getValue());
                            } 
//                            method.setParams(p); 
                            
//                            method.addParameter(entry.getKey(), entry.getValue());
//                            NameValuePair [] ts = (NameValuePair [])nameValuePairs.toArray();
                            
//                            method.setRequestBody(ts);
                    } 
                    
                        client.executeMethod(method); 
                        if (method.getStatusCode() == HttpStatus.SC_OK) { 
                            response = method.getResponseBodyAsString(); 
                        } 
                } catch (IOException e) { 
                        log.error("执行HTTP Post请求" + url + "时，发生异常！", e); 
                } finally { 
                        method.releaseConnection(); 
                } 

                return response; 
        } 

  
}