httprequest- post- get -发送请求

package cn.server;
 
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLDecoder;
import java.net.URLEncoder;
import java.util.List;
import java.util.Map;
 
public class HttpRequest {
  /**
   * 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 sendGet(String url, String param) {
    String result = "";
    BufferedReader in = null;
    try {
      String urlNameString = url + "?" + param;
      URL realUrl = new URL(urlNameString);
      // 打开和URL之间的连接
      URLConnection connection = realUrl.openConnection();
      // 设置通用的请求属性
      connection.setRequestProperty("accept", "*/*");
      connection.setRequestProperty("connection", "Keep-Alive");
      connection.setRequestProperty("user-agent",
          "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
      // 建立实际的连接
      connection.connect();
      // 获取所有响应头字段
      Map<String, List<String>> map = connection.getHeaderFields();
      // 遍历所有的响应头字段
      for (String key : map.keySet()) {
        System.out.println(key + "--->" + map.get(key));
      }
      // 定义 BufferedReader输入流来读取URL的响应
      in = new BufferedReader(new InputStreamReader(
          connection.getInputStream()));
      String line;
      while ((line = in.readLine()) != null) {
        result += line;
      }
    } catch (Exception e) {
      System.out.println("发送GET请求出现异常！" + e);
      e.printStackTrace();
    }
    // 使用finally块来关闭输入流
    finally {
      try {
        if (in != null) {
          in.close();
        }
      } catch (Exception e2) {
        e2.printStackTrace();
      }
    }
    return result;
  }
 
  /**
   * 向指定 URL 发送POST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 所代表远程资源的响应结果
   */
  public static String sendPost(String url, String param) {
    PrintWriter out = null;
    BufferedReader in = null;
    String result = "";
    try {
      URL realUrl = new URL(url);
      // 打开和URL之间的连接
      URLConnection conn = realUrl.openConnection();
      // 设置通用的请求属性
      conn.setRequestProperty("accept", "*/*");
      conn.setRequestProperty("Content-type", "application/json");
      conn.setRequestProperty("connection", "Keep-Alive");
      conn.setRequestProperty("user-agent",
          "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
      // 发送POST请求必须设置如下两行
      conn.setDoOutput(true);
      conn.setDoInput(true);
      // 获取URLConnection对象对应的输出流
      out = new PrintWriter(conn.getOutputStream());
      // 发送请求参数
      out.print(param);
      // flush输出流的缓冲
      out.flush();
      // 定义BufferedReader输入流来读取URL的响应
      in = new BufferedReader(
          new InputStreamReader(conn.getInputStream()));
      String line;
      while ((line = in.readLine()) != null) {
        result += line;
      }
    } catch (Exception e) {
      System.out.println("发送 POST 请求出现异常！" + e);
      e.printStackTrace();
    }
    // 使用finally块来关闭输出流、输入流
    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) {
    // 发送 GET 请求
    // String s = HttpRequest.sendGet(
    // "http://localhost:6144/Home/RequestString", "key=123&v=456");
    // System.out.println(s);
 
    // 发送 POST 请求
    String sr = HttpRequest
        .sendPost(
            "http://localhost:6144/Home/RequestString",
            "\u4e09\u5929\u7684\u4f53\u80b2\u57f9\u8bad\u5728\u8f7b\u677e\u6109\u60a6\u7684\u6c1b\u56f4\u4e2d\u7ed3\u675f\uff0c\u53c2\u8bad\u6559\u5e08\u5728\u5e0c\u671b\u4e5d\u6d32\u57f9\u8bad\u8001\u5e08\u7684\u5e26\u9886\u4e0b\uff0c\u5b66\u5230\u4e86\u66f4\u524d\u6cbf\u7684\u4f53\u80b2\u7406\u8bba\u77e5\u8bc6\u548c\u4f53\u80b2\u6d3b\u52a8\u5b9e\u8df5\u64cd\u4f5c\u8981\u9886\uff0c\u63d0\u9ad8\u4e86\u4e61\u6751\u5b66\u6821\u4f53\u80b2\u6559\u5b66\u8d28\u91cf\uff0c\u4e3a\u4e61\u6751\u513f\u7ae5\u7684\u8eab\u5fc3\u5065\u5eb7\u53d1\u80b2\u5960\u5b9a\u4e86\u575a\u5b9e\u7684\u57fa\u7840\u3002");
    System.out
        .println("\u4e09\u5929\u7684\u4f53\u80b2\u57f9\u8bad\u5728\u8f7b\u677e\u6109\u60a6\u7684\u6c1b\u56f4\u4e2d\u7ed3\u675f\uff0c\u53c2\u8bad\u6559\u5e08\u5728\u5e0c\u671b\u4e5d\u6d32\u57f9\u8bad\u8001\u5e08\u7684\u5e26\u9886\u4e0b\uff0c\u5b66\u5230\u4e86\u66f4\u524d\u6cbf\u7684\u4f53\u80b2\u7406\u8bba\u77e5\u8bc6\u548c\u4f53\u80b2\u6d3b\u52a8\u5b9e\u8df5\u64cd\u4f5c\u8981\u9886\uff0c\u63d0\u9ad8\u4e86\u4e61\u6751\u5b66\u6821\u4f53\u80b2\u6559\u5b66\u8d28\u91cf\uff0c\u4e3a\u4e61\u6751\u513f\u7ae5\u7684\u8eab\u5fc3\u5065\u5eb7\u53d1\u80b2\u5960\u5b9a\u4e86\u575a\u5b9e\u7684\u57fa\u7840\u3002");
    System.out.println(sr);
 
  }
}