Java POST 数据请求返回 HTTP 响应码 500

Question

我正在开发一个需要用户登录的 Java 程序，但是当结束 HTTP 请求并尝试读取输出时，它会返回 HTTP 响应代码 500。

Login.java中的代码如下：

package net.discfiresoftworks.chat;

import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;

import javax.swing.BorderFactory;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
import javax.swing.border.EmptyBorder;

public class Login extends JFrame
{
    private static final long serialVersionUID = 1L;

    public JTextField user = new JTextField();
    public JPasswordField pass = new JPasswordField(20);
    public JButton submit = new JButton("Log In");
    public JButton create = new JButton("Sign-Up");
    public JPanel main = new JPanel();
    public JPanel buttons = new JPanel();

    public Login()
    {
        setTitle("DiscFire Account Login");
        setSize(350, 180);
        setDefaultCloseOperation(3);
        setLayout(new FlowLayout(1));
        setLocationRelativeTo(null);
        setResizable(false);
        getContentPane().setBackground(new Color(50, 50, 50));

        user.setColumns(20);
        pass.setColumns(20);
        pass.setBorder(BorderFactory.createCompoundBorder(new EmptyBorder(10, 0, 10, 0), pass.getBorder()));

        submit.setBorder(BorderFactory.createLineBorder(Color.GRAY, 1));
        create.setBorder(BorderFactory.createLineBorder(Color.GRAY, 1));

        submit.addActionListener(new ActionListener(){

            @Override
            public void actionPerformed(ActionEvent e)
            {
                String password = new String(pass.getPassword());

                sendRequest(user.getText(), password);
            }

        });

        create.addActionListener(new ActionListener(){

            @Override
            public void actionPerformed(ActionEvent e)
            {

            }

        });

        buttons.setLayout(new FlowLayout());
        buttons.add(submit);
        buttons.add(create);

        main.setLayout(new BoxLayout(main, BoxLayout.Y_AXIS));
        main.setBorder(BorderFactory.createLineBorder(Color.WHITE, 10));
        main.add(user);
        main.add(pass);
        main.add(buttons);

        add(main);
    }

    public void open()
    {
        setVisible(true);
    }

    public void sendRequest(String user, String pass)
    {
        String output = "";

        try
        {
            String urlParameters = "user=" + URLEncoder.encode(user,"UTF-8") + "&pass=" + URLEncoder.encode(pass,"UTF-8");
            URL url = new URL("http://www.discfiresoftworks.net/plogin.php");
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();  
            connection.setDoOutput(true);
            connection.setDoInput(true);
            connection.setInstanceFollowRedirects(false); 
            connection.setRequestMethod("POST");
            connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
            connection.setRequestProperty("charset", "utf-8");
            connection.setRequestProperty("Content-Length", "" + Integer.toString(urlParameters.getBytes().length));
            connection.setUseCaches(false);

            DataOutputStream wr = new DataOutputStream(connection.getOutputStream());
            wr.writeBytes(urlParameters);
            wr.flush();
            wr.close();

            System.out.println(urlParameters);

            BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));

            output = in.readLine();

            in.close();
            connection.disconnect();

        }catch(Exception e){
            e.printStackTrace();
        }

        String sid = (output.split(":"))[0];
    String admin = (output.split(":"))[1];

    System.out.println(sid = " " + admin);
    }

}

plgin.php中的代码如下：

<?php

include 'includes/conn.php';
include 'includes/hash.php'

session_start();

if(isset($_POST['user']) && isset($_POST['pass'])){

    $user = $_POST['user'];
    $password = $_POST['pass'];

    if(isset($_POST['redir'])){
        $redir = $_POST['redir'];
    }else{
        $redir = '';
    }

    $query = $conn->prepare("SELECT Password, Verified, Admin FROM Users WHERE Name=?");
    $query->bind_param('s', $user);

    if($query->execute()){

        $query->bind_result($hash, $ver, $admin);

        while($query->fetch()){

            if($ver == "T"){
                if($query->num_rows > 0){

                    if(validate_password($password, $hash)){

                        $_SESSION['user'] = $user;

                        $msg = session_id() . ':' . $user;

                    }else{
                        $msg = 'Incorrect username or password';
                    }
                }else{
                    $msg = 'Incorrect username or password';
                }
            }else{
                $msg = 'Your account has not been verified, please check your email and do so now if you wish to continue.';
            }

            }

    }else{
        $msg = $query->errno . " " . $query->error;
    }

}else{
    $msg = 'Missing username or password';
}

echo $msg;

?>

先谢谢了，希望你能帮助我:)

编辑：我知道这不是 conn.php 或 hash.php 的错误，因为我之前都使用过它们并且它们都可以正常工作。

编辑：堆栈跟踪：

java.io.IOException: Server returned HTTP response code: 500 for URL: http://www.discfiresoftworks.net/plogin.php
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
    at net.discfiresoftworks.chat.Login.sendRequest(Login.java:116)
    at net.discfiresoftworks.chat.Login$1.actionPerformed(Login.java:58)
    at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
    at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
    at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
    at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
    at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
    at java.awt.Component.processMouseEvent(Unknown Source)
    at javax.swing.JComponent.processMouseEvent(Unknown Source)
    at java.awt.Component.processEvent(Unknown Source)
    at java.awt.Container.processEvent(Unknown Source)
    at java.awt.Component.dispatchEventImpl(Unknown Source)
    at java.awt.Container.dispatchEventImpl(Unknown Source)
    at java.awt.Component.dispatchEvent(Unknown Source)
    at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
    at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
    at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
    at java.awt.Container.dispatchEventImpl(Unknown Source)
    at java.awt.Window.dispatchEventImpl(Unknown Source)
    at java.awt.Component.dispatchEvent(Unknown Source)
    at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
    at java.awt.EventQueue.access$200(Unknown Source)
    at java.awt.EventQueue$3.run(Unknown Source)
    at java.awt.EventQueue$3.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
    at java.awt.EventQueue$4.run(Unknown Source)
    at java.awt.EventQueue$4.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
    at java.awt.EventQueue.dispatchEvent(Unknown Source)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
    at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    at java.awt.EventDispatchThread.run(Unknown Source)
Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: 1
    at net.discfiresoftworks.chat.Login.sendRequest(Login.java:128)
    at net.discfiresoftworks.chat.Login$1.actionPerformed(Login.java:58)
    at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
    at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
    at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
    at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
    at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
    at java.awt.Component.processMouseEvent(Unknown Source)
    at javax.swing.JComponent.processMouseEvent(Unknown Source)
    at java.awt.Component.processEvent(Unknown Source)
    at java.awt.Container.processEvent(Unknown Source)
    at java.awt.Component.dispatchEventImpl(Unknown Source)
    at java.awt.Container.dispatchEventImpl(Unknown Source)
    at java.awt.Component.dispatchEvent(Unknown Source)
    at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
    at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
    at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
    at java.awt.Container.dispatchEventImpl(Unknown Source)
    at java.awt.Window.dispatchEventImpl(Unknown Source)
    at java.awt.Component.dispatchEvent(Unknown Source)
    at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
    at java.awt.EventQueue.access$200(Unknown Source)
    at java.awt.EventQueue$3.run(Unknown Source)
    at java.awt.EventQueue$3.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
    at java.awt.EventQueue$4.run(Unknown Source)
    at java.awt.EventQueue$4.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
    at java.awt.EventQueue.dispatchEvent(Unknown Source)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
    at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    at java.awt.EventDispatchThread.run(Unknown Source)

Answer 1

我有同样的问题，现在解决了。 只需检查正确的编码。确保您已将所有内容编码为相同的字符集。 就我而言，我使用的是 ISO8859_1 编码。服务器对 Firefox 浏览器响应正常，但对我的 java 程序响应错误 500。我更改为 ISO8859_1，现在它可以工作了：

    public void sendPost(String Url, String params) throws Exception {


    String url=Url;
    URL obj = new URL(url);
    HttpsURLConnection con = (HttpsURLConnection) obj.openConnection();

    con.setRequestProperty("Acceptcharset", "en-us");
    con.setRequestProperty("Accept-Language", "en-US,en;q=0.5");
    con.setRequestProperty("charset", "EN-US");
    con.setRequestProperty("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");
    String urlParameters=params;
    // Send post request
    con.setDoOutput(true);
    con.setDoInput(true);
    con.connect();
    //con.

    DataOutputStream wr = new DataOutputStream(con.getOutputStream());
    wr.writeBytes(urlParameters);
    wr.flush();
    wr.close();

    int responseCode = con.getResponseCode();
    System.out.println("\nSending 'POST' request to URL : " + url);
    System.out.println("Post parameters : " + urlParameters);
    System.out.println("Response Code : " + responseCode);

    BufferedReader in = new BufferedReader(
            new InputStreamReader(con.getInputStream()));
    String inputLine;
    StringBuffer response = new StringBuffer();

    while ((inputLine = in.readLine()) != null) {
        response.append(inputLine);
    }
    in.close();

    //print result
    System.out.println(response.toString());
    this.response=response.toString();
    con.disconnect();

}

在主程序中我这样称呼它：

    certcon.sendPost("https://www.desphilboy.com/authbox/generateCRT","csr_string="+URLEncoder.encode(requestparams,"ISO8859_1"));