Http request class
package wzh.Http; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.io.PrintWriter; import java.net.URL; import java.net.URLConnection; import java.util.List; import java.util.Map; public class HttpRequest { /** * Send a GET method request to the specified URL * * @param url * The URL to send the request to * @param param * Request parameter, the request parameter should be in the form of name1=value1&name2=value2. * The response result of the remote resource represented by the @return URL */ public static String sendGet(String url, String param) { String result = ""; BufferedReader in = null; try { String urlNameString = url + "?" + param; URL realUrl = new URL(urlNameString); // open the connection to the URL URLConnection connection = realUrl.openConnection(); // Set common request attributes connection.setRequestProperty("accept", "*/*"); connection.setRequestProperty("connection", "Keep-Alive"); connection.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)"); // establish the actual connection connection.connect(); // Get all response header fields Map<String, List<String>> map = connection.getHeaderFields(); // loop through all response header fields for (String key : map.keySet()) { System.out.println(key + "--->" + map.get(key)); } // Define the BufferedReader input stream to read the response from the URL in = new BufferedReader(new InputStreamReader( connection.getInputStream())); String line; while ((line = in.readLine()) != null) { result += line; } } catch (Exception e) { System.out.println("An exception occurred when sending a GET request!" + e); e.printStackTrace (); } // use finally block to close the input stream finally { try { if (in != null) { in.close(); } } catch (Exception e2) { e2.printStackTrace(); } } return result; } /** * Send a POST request to the specified URL * * @param url * The URL to send the request to * @param param * Request parameter, the request parameter should be in the form of name1=value1&name2=value2. * The response result of the remote resource represented by @return */ public static String sendPost(String url, String param) { PrintWriter out = null; BufferedReader in = null; String result = ""; try { URL realUrl = new URL (url); // open the connection to the URL URLConnection conn = realUrl.openConnection(); // Set common request attributes conn.setRequestProperty("accept", "*/*"); conn.setRequestProperty("connection", "Keep-Alive"); conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)"); // Sending a POST request must set the following two lines conn.setDoOutput(true); conn.setDoInput(true); // Get the output stream corresponding to the URLConnection object out = new PrintWriter(conn.getOutputStream()); // send request parameters out.print(param); // flush the buffer of the output stream out.flush(); // Define the BufferedReader input stream to read the response from the URL in = new BufferedReader( new InputStreamReader(conn.getInputStream())); String line; while ((line = in.readLine()) != null) { result += line; } } catch (Exception e) { System.out.println("An exception occurred when sending POST request!"+e); e.printStackTrace (); } //Use finally block to close output stream, input stream finally{ try{ if(out!=null){ out.close(); } if(in!=null){ in.close(); } } catch(IOException ex){ ex.printStackTrace(); } } return result; } }
Call method:
public static void main(String[] args) { //Send GET request String s=HttpRequest.sendGet("http://localhost:6144/Home/RequestString", "key=123&v=456"); System.out.println(s); // send POST request String sr=HttpRequest.sendPost("http://localhost:6144/Home/RequestPostString", "key=123&v=456"); System.out.println(sr); }
https://www.cnblogs.com/zhuawang/archive/2012/12/08/2809380.html