JAVA通過HTTP訪問:Post+Get方式
阿新 • • 發佈:2019-01-07
public class TestGetPost { /** * 向指定URL傳送GET方法的請求 * @param url 傳送請求的URL * @param param 請求引數,請求引數應該是name1=value1&name2=value2的形式。 * @return URL所代表遠端資源的響應 */ public static String sendGet(String url, String param) { String result = ""; BufferedReader in = null; try { String urlName = url + "?" + param; URL realUrl = new URL(urlName); //開啟和URL之間的連線 URLConnection conn = realUrl.openConnection(); //設定通用的請求屬性 conn.setRequestProperty("accept", "*/*"); conn.setRequestProperty("connection", "Keep-Alive"); conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)"); //建立實際的連線 conn.connect(); //獲取所有響應頭欄位 Map < String, List < String >> map = conn.getHeaderFields(); //遍歷所有的響應頭欄位 for (String key: map.keySet()) { System.out.println(key + "--->" + map.get(key)); } //定義BufferedReader輸入流來讀取URL的響應 in = new BufferedReader(new InputStreamReader(conn.getInputStream())); String line; while ((line = in .readLine()) != null) { result += "/n" + line; } } catch (Exception e) { System.out.println("傳送GET請求出現異常!" + e); e.printStackTrace(); } //使用finally塊來關閉輸入流 finally { try { if ( in != null) { in .close(); } } catch (IOException ex) { ex.printStackTrace(); } } return result; } /** * 向指定URL傳送POST方法的請求 * @param url 傳送請求的URL * @param param 請求引數,請求引數應該是name1=value1&name2=value2的形式。 * @return URL所代表遠端資源的響應 */ public static String sendPost(String url, String param) { PrintWriter out = null; BufferedReader in = null; String result = ""; try { URL realUrl = new URL(url); //開啟和URL之間的連線 URLConnection conn = realUrl.openConnection(); //設定通用的請求屬性 conn.setRequestProperty("accept", "*/*"); conn.setRequestProperty("connection", "Keep-Alive"); conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)"); //傳送POST請求必須設定如下兩行 conn.setDoOutput(true); conn.setDoInput(true); //獲取URLConnection物件對應的輸出流 out = new PrintWriter(conn.getOutputStream()); //傳送請求引數 out.print(param); //flush輸出流的緩衝 out.flush(); //定義BufferedReader輸入流來讀取URL的響應 in = new BufferedReader( new InputStreamReader(conn.getInputStream())); String line; while ((line = in .readLine()) != null) { result += "/n" + line; } } catch (Exception e) { System.out.println("傳送POST請求出現異常!" + e); e.printStackTrace(); } //使用finally塊來關閉輸出流、輸入流 finally { try { if (out != null) { out.close(); } if ( in != null) { in .close(); } } catch (IOException ex) { ex.printStackTrace(); } } return result; } //提供主方法,測試傳送GET請求和POST請求 public static void main(String args[]) { //傳送GET請求 String s = TestGetPost.sendGet("http://localhost:8888/abc/login.jsp", null); System.out.println(s); //傳送POST請求 String s1 = TestGetPost.sendPost(http: //localhost:8888/abc/a.jsp , "user=李剛&pass=abc"); System.out.println(s1); } }