java实现 get、put、post、delete请求

1、get

public static String doGet(String strUrl ){
    	String strReturn=""; 
    	HttpGet httpGet = new HttpGet(strUrl);
    	CloseableHttpClient httpclient = null; 
    	CloseableHttpResponse response1=null;
        try {
        	httpclient = ();
        	response1 = (httpGet); 
            HttpEntity entity1 = (); 
            strReturn=(entity1) ;
            (entity1); 
        }catch(Exception e){ 
        	();
        }finally {  
				try {
					 if(response1!=null)
					();
				} catch (IOException e) { 
					();
				}
        }
    	return strReturn;
    }

2、put

public static String doPut(String strUrl,String param){ 
    	CloseableHttpClient httpclient = ();
	String strReturn="";  
	PutMethod httpput=new PutMethod(strUrl);   
	try {  
		if(param!=null)
		{
			RequestEntity entity = new StringRequestEntity(param, "application/json", "UTF-8");
			(entity);
		}
	        (httpput);
	        byte[] bytes = (); 
	        strReturn=  new String(bytes) ; 
		} catch (Exception e) {
			// TODO Auto-generated catch block
			();
		} 
	     return strReturn;
    }

3、post

public static String doPost(String requestUrl, String payload) {
        CloseableHttpClient httpclient = ();
    	String strReturn="";  
	PostMethod httpost = new PostMethod(requestUrl);    
	try { 
		if(payload!=null)
		{
			RequestEntity entity = new StringRequestEntity(payload, "application/json", "UTF-8");
			(entity);
		}
	        (httpost);
	        byte[] bytes = (); 
	        strReturn=  new String(bytes) ; 
		} catch (Exception e) {
			// TODO Auto-generated catch block
			();
		}
	     return strReturn;
	    }

4、delete

public static void doDelete(String urlToRead) throws Exception {
	    URL url = new URL(urlToRead);
	    HttpURLConnection httpCon = (HttpURLConnection) ();
	    (true);
	    (
	        "Content-Type", "application/x-www-form-urlencoded" );
	    ("DELETE");
	    ();
	    (); 

    }