Java模拟HTTP的Get和Post请求

 /** post
	 * 调用httpClient
	 * @param url 要访问的地址
	 * @param params 要携带的参数
	 * @return
	 */
	private String doHttpClient(String url, NameValuePair[] params) {
		PostMethod post = new PostMethod(url);

		post.setRequestBody(params);

		HttpClient client = new HttpClient();

		String str_result = ""; // 页面返回结果

		try {
			client.executeMethod(post); // 执行post方法
			str_result = post.getResponseBodyAsString();
			return str_result;
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			post.releaseConnection();
		}

		return "";

	}


 /** 
         * 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 doGetHttpClient(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; 
        }