HttpClient的Post和Get方法

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1.不带参数的get请求

/** * 不带参数的Get请求 */public static void doGetWithoutParameter() throws Exception{//创建一个HttpClient对象CloseableHttpClient httpClient = HttpClients.createDefault();//创建一个GET对象HttpGet httpGet = new HttpGet("http://www.baidu.com");//执行请求CloseableHttpResponse response = httpClient.execute(httpGet);//获取返回状态（200为成功）int statusCode = response.getStatusLine().getStatusCode();//获取响应的结果(请求返回的结果保存在Entity中)HttpEntity entity = response.getEntity();String content = EntityUtils.toString(entity,"UTF-8");System.out.println(content);//关闭httpClientresponse.close();httpClient.close();}

2.带参数的Get请求

/** * 代参数的Get请求 */public static void doGetWithParameter() throws Exception{//创建一个HttpClient对象CloseableHttpClient httpClient = HttpClients.createDefault();     // 创建URI对象，定义请求的参数         URI uri = new URIBuilder("http://www.baidu.com/s").setParameter("wd", "java").build();//创建一个GET对象HttpGet httpGet = new HttpGet("http://www.baidu.com");//执行请求CloseableHttpResponse response = httpClient.execute(httpGet);//获取返回状态（200为成功）int statusCode = response.getStatusLine().getStatusCode();//获取响应的结果(请求返回的结果保存在Entity中)HttpEntity entity = response.getEntity();String content = EntityUtils.toString(entity);System.out.println(content);//关闭httpClientresponse.close();httpClient.close();}

3.Post的无参数请求

自己写的服务器程序，用于提供post请求的服务

@RequestMapping(value="/httpclient/post",method=RequestMethod.POST)@ResponseBody public TaotaoResult testPost(){return TaotaoResult.ok();}

对应的请求代码

   // 创建http POST请求  HttpPost httpPost = new HttpPost("http://localhost:8082/httpclient/post");

完整代码：

public static void doPostWithOutParamater() throws Exception{    // 创建Httpclient对象        CloseableHttpClient httpclient = HttpClients.createDefault();        // 创建http POST请求        HttpPost httpPost = new HttpPost("http://localhost:8082/httpclient/post");        CloseableHttpResponse response = null;        try {            // 执行请求            response = httpclient.execute(httpPost);            // 判断返回状态是否为200            if (response.getStatusLine().getStatusCode() == 200) {                String content = EntityUtils.toString(response.getEntity(), "UTF-8");                System.out.println(content);            }        } finally {            if (response != null) {                response.close();            }            httpclient.close();        }    }

3.Post的带参数请求

服务器端

这里MediaType可以设置多个值

/** * ！！!如果不设置返回的数据会乱码 * 设置返回响应数据的数据类型和编码格式 * produces=MediaType.TEXT_PLAIN_VALUE+";charset=utf-8" */@RequestMapping(value="/httpclient/post",method=RequestMethod.POST,produces=MediaType.TEXT_PLAIN_VALUE+";charset=utf-8")@ResponseBody public String testPost(String username,String password){return "username:"+username+"   "+"password:"+password;}

请求端

/** * 带参数的post */public static void doPostWithParamater() throws Exception{    // 创建Httpclient对象        CloseableHttpClient httpclient = HttpClients.createDefault();        // 创建http POST请求        //！！！注意参数不能在URL中添加        HttpPost httpPost = new HttpPost("http://localhost:8082/httpclient/post");          //创建一个Entity，模拟一个表单        List<NameValuePair> parameters = new ArrayList<NameValuePair>();        parameters.add(new BasicNameValuePair("username", "张三"));        parameters.add(new BasicNameValuePair("password", "java"));                // 构造一个form表单式的实体        UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(parameters,"GBK");               //设置请求的内容        httpPost.setEntity(formEntity);                     CloseableHttpResponse response = null;        try {            // 执行请求            response = httpclient.execute(httpPost);            // 判断返回状态是否为200            if (response.getStatusLine().getStatusCode() == 200) {                String content = EntityUtils.toString(response.getEntity(), "UTF-8");                System.out.println(content);            }        } finally {            if (response != null) {                response.close();            }            httpclient.close();        }    }

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