如何在Java中发送HTTP请求？ [英] How to send HTTP request in java?

问题描述

在Java中，如何编写HTTP请求消息并将其发送到HTTP WebServer？ 您可以使用< a href =http://download.oracle.com/javase/7/docs/api/java/net/HttpURLConnection.html =noreferrer> java.net.HttpUrlConnection 。

示例（ from here ），并加以改进。包含在链接的情况下：

  public static String executePost（String targetURL，String urlParameters）{
 HttpURLConnection connection =空值; 
 
尝试{
 //创建连接
 URL url = new URL（targetURL）; 
 connection =（HttpURLConnection）url.openConnection（）; 
 connection.setRequestMethod（POST）; 
 connection.setRequestProperty（Content-Type，
application / x-www-form-urlencoded）; 
 
 connection.setRequestProperty（Content-Length，
 Integer.toString（urlParameters.getBytes（）。length））; 
 connection.setRequestProperty（Content-Language，en-US）; 
 
 connection.setUseCaches（false）; 
 connection.setDoOutput（true）; 
 $ b $ //发送请求
 DataOutputStream wr = new DataOutputStream（
 connection.getOutputStream（））; 
 wr.writeBytes（urlParameters）; 
 wr.close（）; 
 
 //获取响应
 InputStream is = connection.getInputStream（）; 
 BufferedReader rd = new BufferedReader（new InputStreamReader（is））; 
 StringBuilder response = new StringBuilder（）; //或StringBuffer，如果Java版本5+ 
 String line; （（line = rd.readLine（））！= null）{
 response.append（line）; 
 while 
 response.append（'\r'）; 
} 
 rd.close（）; 
 return response.toString（）; 
} catch（Exception e）{
 e.printStackTrace（）; 
返回null; 
} finally {
 if（connection！= null）{
 connection.disconnect（）; 
} 
} 
} 
  

In Java, How to compose a HTTP request message and send it to a HTTP WebServer?

解决方案

You can use java.net.HttpUrlConnection.

Example (from here), with improvements. Included in case of link rot:

public static String executePost(String targetURL, String urlParameters) {
  HttpURLConnection connection = null;

  try {
    //Create connection
    URL url = new URL(targetURL);
    connection = (HttpURLConnection) url.openConnection();
    connection.setRequestMethod("POST");
    connection.setRequestProperty("Content-Type", 
        "application/x-www-form-urlencoded");

    connection.setRequestProperty("Content-Length", 
        Integer.toString(urlParameters.getBytes().length));
    connection.setRequestProperty("Content-Language", "en-US");  

    connection.setUseCaches(false);
    connection.setDoOutput(true);

    //Send request
    DataOutputStream wr = new DataOutputStream (
        connection.getOutputStream());
    wr.writeBytes(urlParameters);
    wr.close();

    //Get Response  
    InputStream is = connection.getInputStream();
    BufferedReader rd = new BufferedReader(new InputStreamReader(is));
    StringBuilder response = new StringBuilder(); // or StringBuffer if Java version 5+
    String line;
    while ((line = rd.readLine()) != null) {
      response.append(line);
      response.append('\r');
    }
    rd.close();
    return response.toString();
  } catch (Exception e) {
    e.printStackTrace();
    return null;
  } finally {
    if (connection != null) {
      connection.disconnect();
    }
  }
}

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