Java发送http的get、post、put请求

1. HTTP GET请求

/*** 向指定URL发送GET方法的请求* @param url   发送请求的URL        * @param param   请求参数，请求参数应该是 name1=value1&name2=value2 的形式。* @return URL   所代表远程资源的响应结果
*/public static String httpGet(String reqUrl, Map<String, String> headers){return httpRequest(reqUrl, headers);}public static String httpRequest(String reqUrl,  Map<String, String> otherHeaders){URL url;try {url = new URL(reqUrl);// 打开和URL之间的连接HttpURLConnection connection = (HttpURLConnection) url.openConnection();//设置用户名密码String userName = "admin";String password = "nsfocus";String auth = userName + ":" + password;BASE64Encoder enc = new BASE64Encoder();String encoding = enc.encode(auth.getBytes());    conn.setDoOutput(true);
//          conn.setDoInput(true);
//          conn.setUseCaches(false);
//          //默认为GET请求
//          conn.setRequestMethod("GET");conn.setRequestProperty("Authorization", "Basic " + encoding);// 设置通用的请求属性for(Entry<String, String> entry : otherHeaders.entrySet()){connection.setRequestProperty(entry.getKey(), entry.getValue());               }// 建立实际的连接connection.connect();// 定义 BufferedReader输入流来读取URL的响应BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream(),"utf-8"));StringBuilder sb = new StringBuilder();String line="";while ((line = reader.readLine()) != null){sb.append(line);}reader.close();connection.disconnect();return sb.toString();//对返回数据进行解析处理String result = sb.toString();root = mapper.readTree(result);Iterator<JsonNode> rootNode = root.elements();while(rootNode.hasNext()){JsonNode c = rootNode.next();JsonNode sites = c.path("site");String ids = sites.path("id").toString();//substring方法，"qiqishuang"去除引号id = ids.substring(1, ids.length()-1);}} catch (IOException e) {log.error("error while getting  request: {}", e.getMessage());return id;} }

2. HTTP POST请求

/*** 向指定URL发送POST方法的请求* @param url   发送请求的URL* @return URL   所代表远程资源的响应结果
*/public static String httpPost(String reqUrl, String content, Map<String, String> headers){return httpRequest(reqUrl, "POST", content, headers);}public static String httpRequest(String reqUrl, String method, String content, Map<String, String> headers){URL url;try {// 打开和URL之间的连接url = new URL(reqUrl);HttpURLConnection connection = (HttpURLConnection) url.openConnection();connection.setDoOutput(true);// Read from the connection. Default is true.connection.setDoInput(true);// Set the post method. Default is GETconnection.setRequestMethod(method);// Post cannot use cachesconnection.setUseCaches(false);connection.setInstanceFollowRedirects(true);for(Entry<String, String> entry : headers.entrySet()){connection.setRequestProperty(entry.getKey(), entry.getValue());                }connection.connect();DataOutputStream out = new DataOutputStream(connection.getOutputStream());// The URL-encoded contendout.writeBytes(content); out.flush();out.close(); // flush and close// 定义 BufferedReader输入流来读取URL的响应BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream(),"utf-8"));StringBuilder sb = new StringBuilder();String line="";while ((line = reader.readLine()) != null){sb.append(line);}reader.close();connection.disconnect();return sb.toString();} catch (IOException e) {log.error("error while posting request: {}", e.getMessage());return null;} }

3. HTTP PUT请求

    public void httpPut(String dst_ip) {GlobalConfig global = GlobalConfig.getInstance();String urlStr = global.sncHost + "/devices/1/acl/aclGroups/aclGroup";//create xml info pushed to controllerString xmlInfo = createXmlInfo(dst_ip);//establish connection and push policy to snc controllertry {URL url = new URL(urlStr);HttpURLConnection conn = (HttpURLConnection)url.openConnection();conn.setRequestMethod("PUT");conn.setDoInput(true);conn.setDoOutput(true);OutputStream os = conn.getOutputStream();     os.write(xmlInfo.getBytes("utf-8")); os.flush();os.close();         BufferedReader br = new BufferedReader(new InputStreamReader(conn.getInputStream()));String line = "";String result = "";while( (line =br.readLine()) != null ){result += line;}log.info(result);br.close();} catch (Exception e) {log.info("Error in pushing policy now");e.printStackTrace();  }}

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Java发送http的get、post、put请求

1. HTTP GET请求

2. HTTP POST请求

3. HTTP PUT请求

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