HttpClient使用

╰半夏微凉° 2021-12-05 15:41 316阅读 0赞

//发送无参get请求
       public void testGetRequestNullParam() throws Exception{
           CloseableHttpClient httpClient= HttpClients.createDefault();
           HttpGet httpGet = new HttpGet("http://www.baidu.com");
           CloseableHttpResponse closeableHttpResponse=null;
           try {
               closeableHttpResponse=httpClient.execute(httpGet);
               String content= EntityUtils.toString(closeableHttpResponse.getEntity(),"utf-8");
               FileUtils.writeStringToFile(new File("D:/baidui.html"),content);
               System.out.println("请求完成");
           } catch (IOException e) {
               e.printStackTrace();
           }finally {
               if(closeableHttpResponse!=null){
                   closeableHttpResponse.close();
               }
               if(httpClient!=null){
                   httpClient.close();
               }
           }
       }
    
       
     //发送有参get请求
       public void testGetRequestAndParam() throws  Exception{
           CloseableHttpClient httpClient=HttpClients.createDefault();
    
               URI urI=new URIBuilder("http://www.baidu.com/s").setParameter("wd","java").build();
               HttpGet httpGet=new HttpGet(urI);
               CloseableHttpResponse closeableHttpResponse=null;
               try {
                   closeableHttpResponse=httpClient.execute(httpGet);
                   if(closeableHttpResponse.getStatusLine().getStatusCode()==200){
                       String content=EntityUtils.toString(closeableHttpResponse.getEntity(),"utf-8");
                       FileUtils.writeStringToFile(new File("D:/BaiduAndParam.html"),content);
                       System.out.println("请求完成");
                   }
               } catch (IOException e) {
                   e.printStackTrace();
               } finally {
               if(closeableHttpResponse!=null){
                   closeableHttpResponse.close();
               }
               if(httpClient!=null){
                   httpClient.close();
               }
           }
       }
       
    
    //发送无参post请求
       public void testPostRequestNullParam() throws  Exception{
           CloseableHttpClient httpClient = HttpClientBuilder.create().setRedirectStrategy(new LaxRedirectStrategy()).build();
    
          // CloseableHttpClient httpClient= HttpClients.createDefault();
           HttpPost httpPost=new HttpPost("http://www.baidu.com");
           //伪装浏览器请求
           httpPost.setHeader("User-Agent", "Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36");
          CloseableHttpResponse closeableHttpResponse=null;
           try {
               closeableHttpResponse=httpClient.execute(httpPost);
               System.out.println(closeableHttpResponse.getStatusLine().getStatusCode()+"状态码");
               if(closeableHttpResponse.getStatusLine().getStatusCode()==200){
                   String  content=EntityUtils.toString(closeableHttpResponse.getEntity(),"utf-8");
                   FileUtils.writeStringToFile(new File("D:/PostNullParam.html"),content);
                   System.out.println("Post请求完成");
               }
           } catch (IOException e) {
               System.out.println("异常抛出");
               e.printStackTrace();
           } finally {
               if(closeableHttpResponse!=null){
                   closeableHttpResponse.close();
               }
               if(httpClient!=null){
                   httpClient.close();
               }
           }
       }
    
    //发送有参post请求
         public void testPostAndParam() throws Exception{
          CloseableHttpClient closeableHttpClient= HttpClients.createDefault();
           //  CloseableHttpClient closeableHttpClient = HttpClientBuilder.create().setRedirectStrategy(new LaxRedirectStrategy()).build();
             HttpPost httpPost=new HttpPost("http://www.baidu.com/s");
           List<NameValuePair> list=new ArrayList<NameValuePair>();
           list.add(new BasicNameValuePair("wd","mysql"));
             UrlEncodedFormEntity   urlEncodedFormEntity=new UrlEncodedFormEntity(list);
             httpPost.setEntity(urlEncodedFormEntity);
             httpPost.setHeader("User-Agent", "Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36");
             CloseableHttpResponse  closeableHttpResponse=null;
             try {
                 closeableHttpResponse=closeableHttpClient.execute(httpPost);
                 // System.out.println(closeableHttpResponse.getStatusLine().getStatusCode()+"状态码");
                 if(closeableHttpResponse.getStatusLine().getStatusCode()==302){    //重定向
                     String content=EntityUtils.toString(closeableHttpResponse.getEntity(),"utf-8");
                     Header header = closeableHttpResponse.getFirstHeader("location"); // 跳转的目标地址是在 HTTP-HEAD 中的
                     String  newuri = header.getValue(); // 这就是跳转后的地址，再向这个地址发出新申请，以便得到跳转后的信息是啥。
                     System.out.println("重定向新地址："+newuri);
                     FileUtils.writeStringToFile(new File("D:/PostAndParam.html"),content);
                     System.out.println("post请求完成");
                 }
             } catch (IOException e) {
                 e.printStackTrace();
             }  finally {
                 if(closeableHttpResponse!=null){
                     closeableHttpResponse.close();
                 }
                 if(closeableHttpClient!=null){
                     closeableHttpClient.close();
                 }
             }
         }

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