get、PUT、POST、delete リクエストの Java 実装

public static String doGet(String strUrl ){
    String strReturn=""; 
    HttpGet httpGet = new HttpGet(strUrl);
    CloseableHttpClient httpclient = null; 
    CloseableHttpResponse response1=null;
        try {
        httpclient = HttpClients.createDefault();
        response1 = httpclient.execute(httpGet); 
            HttpEntity entity1 = response1.getEntity(); 
            strReturn=EntityUtils.toString(entity1) ;
            EntityUtils.consume(entity1); 
        }catch(Exception e){ 
        e.printStackTrace();
        }finally {  
try {
if(response1!=null)
response1.close();
} catch (IOException e) { 
e.printStackTrace();
}
        }
    return strReturn;
    }

public static String doPut(String strUrl,String param){ 
     CloseableHttpClient httpclient = HttpClients.createDefault();
     StringBuffer jsonString= new StringBuffer();
         try {
         final HttpPut put=new HttpPut(strUrl);
         put.setEntity(new StringEntity(param,"UTF-8")); 
            CloseableHttpResponse response1= httpclient.execute(put ); 
             try {
                 HttpEntity entity1 = response1.getEntity();
                 BufferedReader br = new BufferedReader(new InputStreamReader(entity1.getContent())); 
                 String line;
                 while ((line = br.readLine()) != null) {
                         jsonString.append(line);
                 }  
                 
                 EntityUtils.consume(entity1);
             } finally {
                 response1.close();
             }
         }catch(Exception e){
         e.printStackTrace();
         }
         return jsonString.toString();
    }

public static String doPost(String requestUrl, String payload) {
    String strReturn="";  
   PostMethod httpost = new PostMethod(requestUrl);   
   httpost.setRequestBody(payload);  
try { 
       httpClient.executeMethod(httpost);
       byte[] bytes = httpost.getResponseBody(); 
       strReturn=  new String(bytes) ; 
} catch (Exception e) { 
e.printStackTrace();
}
    return strReturn;
   }