Java http post與get請求

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 { /** * 向指定URL發送GET方法的請求 * * @param url * 發送請求的URL * @param param * 請求參數，請求參數應該是 name1=value1&name2=value2 的形式。 * @return URL 所表明遠程資源的響應結果 / public static String sendGet(String url, String param) { String result = ""; BufferedReader in = null; try { String urlNameString = url + "?" + param; URL realUrl = new URL(urlNameString); // 打開和URL之間的鏈接 URLConnection connection = realUrl.openConnection(); // 設置通用的請求屬性 connection.setRequestProperty("accept", "/*"); connection.setRequestProperty("connection", "Keep-Alive"); connection.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)"); // 創建實際的鏈接 connection.connect(); // 獲取全部響應頭字段 Map<String, List<String>> map = connection.getHeaderFields(); // 遍歷全部的響應頭字段 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( connection.getInputStream())); String line; while ((line = in.readLine()) != null) { result += line; } } catch (Exception e) { System.out.println("發送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 (Exception e2) { e2.printStackTrace(); } } return result; }

/**
 * 向指定 URL 發送POST方法的請求
 * 
 * @param url
 *            發送請求的 URL
 * @param param
 *            請求參數，請求參數應該是 name1=value1&name2=value2 的形式。
 * @return 所表明遠程資源的響應結果
 */
public static String sendPost(String url, String param) {
    PrintWriter out = null;
    BufferedReader in = null;
    String result = "";
    try {
        URL realUrl = new URL(url);
        // 打開和URL之間的鏈接
        URLConnection conn = realUrl.openConnection();
        // 設置通用的請求屬性
        conn.setRequestProperty("accept", "*/*");
        conn.setRequestProperty("connection", "Keep-Alive");
        conn.setRequestProperty("user-agent",
                "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
        // 發送POST請求必須設置以下兩行
        conn.setDoOutput(true);
        conn.setDoInput(true);
        // 獲取URLConnection對象對應的輸出流
        out = new PrintWriter(conn.getOutputStream());
        // 發送請求參數
        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 += line;
        }
    } catch (Exception e) {
        System.out.println("發送 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;
}

}

public static void main(String[] args) { //發送 GET 請求 String s=HttpRequest.sendGet("http://localhost:6144/Home/RequestString", "key=123&v=456"); System.out.println(s);

//發送 POST 請求
    String sr=HttpRequest.sendPost("http://localhost:6144/Home/RequestPostString", "key=123&v=456");
    System.out.println(sr);
}