JAVA:通过 HTTPS POST 数据似乎没有发送？

Question

我在 Java 中通过 HTTPS 发布数据时遇到问题。无论我是否发送“查询”，服务器响应都是相同的。也许有人可以指出问题是什么......

谢谢!

主类:

package bind;

public class Main {

    public static final String urlString = "https://www.sms.ethz.ch/cgi-bin/sms/send.pl";

    public static void main(String[] args) {

 Message msg = new Message("Alles klar?");
 URL url = new URL(urlString);

 String[][] values = new String[3][2];
 values[0][0] = "action";
 values[0][1] = "listoriginators";
 values[1][0] = "username";
 values[1][1] = "xxxxxx";
 values[2][0] = "password";
 values[2][1] = "xxxxxx";


 Query query = new Query(values);
 System.out.println("Query: " + query.getQuery());

 Request request = new Request(url.getURL(), query.getQuery());


    }
}

请求类:

package bind;

public class Request {
    static private int ic = 0;
    private URL url;

    protected Request(java.net.URL URL, String query){
 ic++;
 if(CONSTANTS.SHOW_LOGS) { System.out.println("log: new instance of 'Message'"); }

 // connect
 try {

     System.setProperty("java.protocol.handler.pkgs", "com.sun.net.ssl.internal.www.protocol");
     java.security.Security.addProvider(new com.sun.net.ssl.internal.ssl.Provider());

     javax.net.ssl.HttpsURLConnection connection = (javax.net.ssl.HttpsURLConnection) URL.openConnection();
     connection.setDoInput(true);
     connection.setDoOutput(true);
     connection.setRequestMethod("POST");
     connection.setFollowRedirects(true);

     connection.setRequestProperty("Content-Length", String.valueOf(query.length()));
     connection.setRequestProperty("Content-Type", "application/x-www- form-urlencoded");
     connection.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)");

     java.io.DataOutputStream output = new java.io.DataOutputStream(connection.getOutputStream());

     output.writeBytes(query); // <<-- NOTHING CHANGES IF I COMMENT THIS OUT OR NOT !!??!?!

     System.out.println("log: response code: " + connection.getResponseCode());
     System.out.println("log: response message: " + connection.getResponseMessage());

     java.io.DataInputStream input = new java.io.DataInputStream(connection.getInputStream());
     for(int i = input.read(); i != -1; i = input.read()) {
  System.out.print((char)i);
     }
     System.out.print("\n");
     input.close();

 } catch(java.io.IOException e) {
     if(CONSTANTS.SHOW_LOGS) {
  System.out.println("error: unable to connect");
  System.out.println(e);
  e.printStackTrace();
     }
 }

    }
}

URL 类别:

public class URL {
    static private int ic = 0;
    private String URLString;
    private java.net.URL url;

    protected URL(String a_url){
 ic++;

 if(CONSTANTS.SHOW_LOGS) { System.out.println("log: new instance of 'URL'"); }

 setURLString(a_url);
 createURL();
    }

    private void setURLString(String a_url) {
 URLString = a_url;
    }

    private void createURL() {
 try {
     url = new java.net.URL(URLString);
 } catch(java.net.MalformedURLException e) {
     System.out.println("error: invalid URL");
     System.out.println(e);
     e.printStackTrace();
 }
    }

    private void showURL() {
 System.out.println("URL: " + url.getHost() + url.getPath());
    }

    public java.net.URL getURL() {
 return url;
    }

}

PS:大部分来自这里:http://www.java-samples.com/java/POST-toHTTPS-url-free-java-sample-program.htm

Answer 1

您忘记了之后flush()，或者更好的是close()流(它已经执行了隐式刷新)。刷新是必要的，因为数据可能会在内部缓冲到一定长度，并且刷新会强制将整个缓冲区实际写入输出。

所以，改变

 output.writeBytes(query);

至

 output.writeBytes(query);
 output.close();

实际上，正常的习惯用法是在获取流后在 try block 的 finally block 中关闭它们，这样就可以保证它们被关闭每当写入期间发生 IOException 时。关闭很重要，因为它可以释放系统资源。

Stream stream = null; // Can be InputStream, OutputStream, Reader or Writer.
try {
    stream = new SomeStream();
    // ...
} finally {
    if (stream != null) try { stream.close(); } catch (IOException logOrIgnore) {} // You can if necessary bake an utility method taking Closeable or take a look for commons IO.
}

另请参阅Sun Java IO tutorial了解更多基本类(class)和指南。