使用HttpClient进行http post/get方法的调用

 1 public class HttpUtils {  
 2       
 3     final static Header HEADER_USER_AGENT = new BasicHeader( "user-agent" , "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2700.0 Safari/537.36");  
 4     final static Header HEADER_CONNECTION = new BasicHeader( "connection" , "keep-alive");  
 5     final static Header HEADER_CACHE_CONTROL = new BasicHeader( "cache-control" , "max-age=0");  
 6     final static Header HEADER_ACCEPT = new BasicHeader( "accept" , "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8");  
 7     final static Header HEADER_ACCEPT_ENCODING = new BasicHeader( "accept-encoding" , "gzip, deflate, sdch");  
 8     final static Header HEADER_ACCEPT_LANGUAGE = new BasicHeader( "accept-language" , "zh-CN,zh;q=0.8,en;q=0.6");  
 9     /**  
10      * 发送get请求  
11      * @param url 请求的url链接  
12      * @param charSet该链接字符编码  
13      * */  
14     public static String requestGet(String url , String charSet , NameValuePair...nameValuePairs){  
15         CloseableHttpClient httpclient = HttpClients.createDefault();    
16         CloseableHttpResponse response = null ;  
17         try {  
18             HttpGet httpget = new HttpGet( url );    
19             httpget.setHeader( HEADER_USER_AGENT ) ;  
20             httpget.setHeader( HEADER_CONNECTION ) ;  
21             httpget.setHeader( HEADER_CACHE_CONTROL ) ;  
22             httpget.setHeader( HEADER_ACCEPT ) ;  
23             httpget.setHeader( HEADER_ACCEPT_ENCODING);  
24             httpget.setHeader( HEADER_ACCEPT_LANGUAGE);  
25               
26             response = httpclient.execute( httpget ) ;  
27             if(response.getStatusLine().getStatusCode() == 200){  
28                 HttpEntity entity = response.getEntity() ;  
29                 return inputStreamToString( entity , charSet );  
30             }  
31         } catch (Exception e) {  
32             LogManager.err("requestGet:" + url , e) ;  
33         }finally{  
34             try {  
35                 response.close();  
36                 httpclient.close();  
37             } catch (Exception e) {  
38             }  
39         }  
40         return "" ;  
41     }  
42       
43     /** 
44      * 发送post请求 
45      * @param url 请求的url链接 
46      * @param charSet该链接字符编码 
47      * */  
48     public static String requestPost(String url , String charSet , NameValuePair...nameValuePairs){  
49         CloseableHttpClient httpclient = HttpClients.createDefault();    
50         CloseableHttpResponse response = null ;  
51         try {  
52             HttpPost httpPost = new HttpPost( url );    
53             httpPost.setHeader( HEADER_USER_AGENT ) ;  
54             httpPost.setHeader( HEADER_CONNECTION ) ;  
55             httpPost.setHeader( HEADER_CACHE_CONTROL ) ;  
56             httpPost.setHeader( HEADER_ACCEPT ) ;  
57             httpPost.setHeader( HEADER_ACCEPT_ENCODING);  
58             httpPost.setHeader( HEADER_ACCEPT_LANGUAGE);  
59               
60             List<namevaluepair> formparams = Arrays.asList( nameValuePairs );  
61             UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(formparams, Consts.UTF_8);   
62               
63             httpPost.setEntity( formEntity ) ;  
64             response = httpclient.execute( httpPost ) ;   
65             if(response.getStatusLine().getStatusCode() == 200){  
66                 HttpEntity entity = response.getEntity() ;  
67                 return inputStreamToString( entity , charSet );  
68             }  
69         } catch (Exception e) {  
70             LogManager.err("requestPost:" + url , e) ;   
71         }finally{  
72             try {  
73                 response.close();  
74                 httpclient.close();  
75             } catch (Exception e) {  
76             }  
77         }  
78         return "" ;  
79     }  
80       
81       
82     private static String inputStreamToString(HttpEntity entity , String charSet)  
83             throws Exception{  
84         InputStream is = null ;   
85         ByteArrayOutputStream baos = new ByteArrayOutputStream();  
86         try {  
87             is = entity.getContent() ;  
88             byte[]bytes = new byte[52428800] ;  
89             int buffer = -1;  
90               
91             while( (buffer = is.read(bytes)) != -1){  
92                 baos.write(bytes, 0, buffer) ;  
93             }  
94             return new String(baos.toByteArray() , charSet ) ;  
95         }finally{  
96             StreamUtils.closeInput( is );  
97             StreamUtils.closeOutput( baos );  
98         }  
99     }
View Code
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原文地址：https://www.cnblogs.com/xlhan/p/7232960.html