1、通过get请求后台，注意tomcat的编码设置成utf-8; <Connector connectionTimeout="20000" port="8080" protocol="HTTP/1.1" redirectPort="8443" URIEncoding="UTF-8" />
/** ?????* 发送 get请求 ?????*/ ?????public static void get() { ?????????CloseableHttpClient httpclient = HttpClients.createDefault(); ?????????try { ?????????????//先将参数放入List，再对参数进行URL编码 ????????????List<BasicNameValuePair> params = new LinkedList<BasicNameValuePair>(); ????????????params.add(new BasicNameValuePair("get", "get请求哈哈哈")); ????????????//对参数编码 ????????????String param = URLEncodedUtils.format(params, "UTF-8"); ????????????// 创建httpget. ???????????????HttpGet httpget = new HttpGet("http://localhost:8080/HttpServleTest.html?"+param); ?????????????// 执行get请求. ???????????????CloseableHttpResponse response = httpclient.execute(httpget); ?????????????try { ?????????????????// 获取响应实体 ???????????????????HttpEntity entity = response.getEntity(); ????????????????// 打印响应状态码 ???????????????????System.out.println(response.getStatusLine().getStatusCode()); ?????????????????if (entity != null) { ?????????????????????// 打印响应内容 ???????????????????????System.out.println("Response content: " + EntityUtils.toString(entity,"UTF-8")); ?????????????????} ?????????????} finally { ?????????????????response.close(); ?????????????} ?????????} catch (Exception e) { ?????????????e.printStackTrace(); ?????????} finally { ?????????????// 关闭连接,释放资源 ???????????????try { ?????????????????httpclient.close(); ?????????????} catch (IOException e) { ?????????????????e.printStackTrace(); ?????????????} ?????????} ?????} ?2.post请求
/** ?????* 发送 post ????*/ ?????public static void post() { ?????????// 创建默认的httpClient实例. ???????????CloseableHttpClient httpclient = HttpClients.createDefault(); ?????????// 创建httppost ???????????HttpPost httppost = new HttpPost("http://localhost:8080/HttpServleTest.html"); ?????????// 创建参数队列 ???????????List<NameValuePair> formparams = new ArrayList<NameValuePair>(); ?????????formparams.add(new BasicNameValuePair("post", "post请求哈哈哈")); ?????????UrlEncodedFormEntity uefEntity; ?????????try { ?????????????uefEntity = new UrlEncodedFormEntity(formparams, "UTF-8"); ?????????????httppost.setEntity(uefEntity); ?????????????CloseableHttpResponse response = httpclient.execute(httppost); ?????????????try { ?????????????????HttpEntity entity = response.getEntity(); ?????????????????if (entity != null) { ?????????????????????System.out.println("Response content: " + EntityUtils.toString(entity, "UTF-8")); ?????????????????} ?????????????} finally { ?????????????????response.close(); ?????????????} ?????????} catch (Exception e) { ?????????????e.printStackTrace(); ?????????} finally { ?????????????// 关闭连接,释放资源 ???????????????try { ?????????????????httpclient.close(); ?????????????} catch (IOException e) { ?????????????????e.printStackTrace(); ?????????????} ?????????} ?????} ?3、后台服务程序和本案例代码下载地址：
httpclient的简单使用
原文地址：http://www.cnblogs.com/zhangjinru123/p/7499138.html