HttpClientUtil封装一

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本文介绍如何利用Apache HttpClient库实现HTTP GET和POST请求的发送，并提供了完整的Java示例代码，包括设置请求参数、处理响应等关键步骤。

需要添加相应的jar包

package com.http_request.httpclient;

import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.NameValuePair;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.methods.PostMethod;


/**
 * @author xiaoli
 * HttpClient
 */
public class GetHttpClient {
	
	/**
	 * 默认的编码,解决中文乱码
	 */
	public static String defaultEncode = "UTF-8";
	
	/**
	 * 发送Get请求
	 * @param url 请求路径
	 * @param paramMap 参数
	 * @return 响应体
	 */
	public static String getSendGet(String url,Map<String, String> paramMap){
		   return getSendGet(url, paramMap, defaultEncode);
	}
	/**
	 * 发送Get请求
	 * @param url 请求路径
	 * @param paramMap 参数
	 * @param encode 编码
	 * @return 响应体
	 */
	public static String getSendGet(String url,Map<String, String> paramMap,String encode){
			 StringBuffer buf = new StringBuffer();
		     HttpClient client = new HttpClient();  
	    	 GetMethod getMethod = new GetMethod(url);  
			 if(paramMap.size()>0){
				     NameValuePair[] params = new NameValuePair[paramMap.size()];
			    	 Iterator<Entry<String, String>> it = paramMap.entrySet().iterator();
			    	 int i = 0;
			    	 while (it.hasNext()) {
			    	 Map.Entry<String, String> map = (Map.Entry<String, String>) it.next();
			    	      params[i] = new NameValuePair(map.getKey(),map.getValue());
			    	      i++;
			    	 }
			 	     getMethod.setQueryString(params); // post请求参数用setQueryString
			   }
	        try {  
			         client.executeMethod(getMethod);  
			         byte[] responseBody = getMethod.getResponseBody();  
			         String content = new String(responseBody,encode);
			         buf.append(content);
	            }catch (Exception e) {  
	                e.printStackTrace();  
	            }finally{  
	                getMethod.releaseConnection();  
	            }  
		        return buf.toString();
	}
	
	
	/**
	 * 发送Post请求
	 * @param url 请求路径
	 * @param paramMap 参数
	 * @return 响应体
	 */
	public static String getSendPost(String url,Map<String, String> paramMap){
		return getSendPost(url, paramMap, defaultEncode);
	}
	/**
	 * 发送Post请求
	 * @param url 请求路径
	 * @param paramMap 参数
	 * @return 响应体
	 */
	public static String getSendPost(String url,Map<String, String> paramMap,String encode){
			 StringBuffer buf = new StringBuffer();
		     HttpClient client = new HttpClient();  
	    	 PostMethod postMethod = new PostMethod(url);  
	    	 postMethod.setRequestHeader("Content-Type","application/x-www-form-urlencoded;charset="+encode); 
			 if(paramMap.size()>0){
				     NameValuePair[] params = new NameValuePair[paramMap.size()];
			    	 Iterator<Entry<String, String>> it = paramMap.entrySet().iterator();
			    	 int i = 0;
			    	 while (it.hasNext()) {
			    	 Map.Entry<String, String> map = (Map.Entry<String, String>) it.next();
			    	      params[i] = new NameValuePair(map.getKey(),map.getValue());
			    	      i++;
			    	 }
			 	     postMethod.setRequestBody(params); // post请求参数用setRequestBody
			   }
	        try {  
			         client.executeMethod(postMethod);  
			         byte[] responseBody = postMethod.getResponseBody();  
			         String content = new String(responseBody,encode);
			         buf.append(content);
	            }catch (Exception e) {  
	                e.printStackTrace();  
	            }finally{  
	                postMethod.releaseConnection();  
	            }  
		        return buf.toString();
	}
	
}