在Java中向同一个PHP脚本发送两个不同的请求

Question

我正在尝试制作一个与我在线的 PHP 脚本进行通信的 Java 应用程序！我的应用程序发出一个请求来接收一些数据，然后处理它并向脚本发出另一个请求。但是，第二个请求根本不起作用，即使我 close() OutputStreamWriter、BufferedReader 和 HttpsUrlConnection< /code> 第一个请求！

我知道这不是请求不起作用，因为我先发送了它，它起作用了！而且我还知道第二个请求的方法正在运行。以下是我目前所掌握的基础知识：

try{
    URL url = new URL("https://mysite.com/script.php");
    HttpsUrlConnection conn = (HttpsUrlConnection) url.openConnection()
    conn.setDoInput(true); conn.setDoOutput(true);

    String request = URLEncoder.encode("request_type", "UTF-8) + "=" + URLEncoder.encode("first", "UTF-8);
    OutputStreamWriter writer = new OutputStreamWriter(conn.getOutputStream());
    writer.write(request);
    writer.flush();

    BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
    String response;

    while((response = in.readLine()) != null){
         if(response.equals("firstresponse")){
             in.close(); writer.close();
             conn.disconnect();
             makeSecondRequest();}
    }
}catch(Exception e){}

public void makeSecondRequest(){
    URL url = new URL("https://mysite.com/script.php");
    HttpsUrlConnection conn = (HttpsUrlConnection) url.openConnection()
    conn.setDoInput(true); conn.setDoOutput(true);

    String request = URLEncoder.encode("request_type", "UTF-8) + "=" + URLEncoder.encode("second", "UTF-8);
    OutputStreamWriter writer = new OutputStreamWriter(conn.getOutputStream());
    writer.write(request);
    writer.flush();
}

所以，如果有人知道应该如何完成/为什么它可能不起作用，如果您能尽快告诉我，我将不胜感激......

提前致谢

更新： 我现在已在 我的 代码的 makeSecondRequest() 部分的 catch 语句中添加了 e.printStackTrace()我收到以下信息：

java.lang.IllegalStateException: Already connected
    at java.net.URLConnection.setDoOutput(URLConnection.java:909)
    at sun.net.www.protocol.https.HttpsURLConnectionImpl.setDoOutput(HttpsURLConnectionImpl.java:454)
    at engines.LicenceManagement.sendFingerprint(LicenceManagement.java:193)
    at engines.LicenceManagement.verifyOnline(LicenceManagement.java:147)
    at engines.LicenceManagement.actionPerformed(LicenceManagement.java:541)
    at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
    at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)
    at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
    at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
    at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
    at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:289)
    at java.awt.Component.processMouseEvent(Component.java:6504)
    at javax.swing.JComponent.processMouseEvent(JComponent.java:3321)
    at java.awt.Component.processEvent(Component.java:6269)
    at java.awt.Container.processEvent(Container.java:2229)
    at java.awt.Component.dispatchEventImpl(Component.java:4860)
    at java.awt.Container.dispatchEventImpl(Container.java:2287)
    at java.awt.Component.dispatchEvent(Component.java:4686)
    at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832)
    at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4492)
    at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)
    at java.awt.Container.dispatchEventImpl(Container.java:2273)
    at java.awt.Window.dispatchEventImpl(Window.java:2713)
    at java.awt.Component.dispatchEvent(Component.java:4686)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:707)
    at java.awt.EventQueue.access$000(EventQueue.java:101)
    at java.awt.EventQueue$3.run(EventQueue.java:666)
    at java.awt.EventQueue$3.run(EventQueue.java:664)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
    at java.awt.EventQueue$4.run(EventQueue.java:680)
    at java.awt.EventQueue$4.run(EventQueue.java:678)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:677)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:211)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:128)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:117)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:113)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:105)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:90)

Answer 1

问题是您永远不会调用 连接 方法。在第一个请求中，getInputStream() 方法调用 connect 方法。因此，要解决您的问题，将 conn.connect() 添加到 makeSecondRequest 方法中就足够了。

Answer 2

不要问我为什么，因为我不知道，但是，我实际上将第二种方法放入另一个类中，你知道吗，没有错误！

我现在不打算调查原因，因为我想尽快完成我的软件，但如果有人想在这个问题上启发我，请成为我的客人 - 我将不胜感激！