java - 谁能告诉我为什么在使用 SSL 时在 Java 中出现错误？

Question

我一直在尝试在 Cpp 服务器和 Java applet 客户端之间建立连接，但是当我运行 applet 时，我在浏览器中遇到了这个错误。我在信任存储文件中有证书(如果我不需要它请告诉我)。任何帮助将不胜感激。

access denied ("java.util.propertypermission" "javax.net.ssl.truststore" "write")

import java.awt.*;
import java.applet.*;
import javax.net.ssl.SSLSocket;
import javax.net.ssl.SSLSocketFactory;
import java.io.*;
import javax.swing.*;

public class no2 extends Applet {

   int width, height;

   public void init() {

        System.setProperty("javax.net.ssl.trustStore", "keystore.jks"); 
        System.setProperty("javax.net.ssl.trustStorePassword", "changeit"); 

        String trustStore = System.getProperty("javax.net.ssl.trustStore"); 
        if (trustStore == null) { 
            System.out.println("javax.net.ssl.trustStore is not defined"); 
        } else { 
            System.out.println("javax.net.ssl.trustStore = " + trustStore); 
        } 

        try {

        PrintWriter toServer = null;
        BufferedReader fromServer = null;

        SSLSocketFactory sslsocketfactory = (SSLSocketFactory) SSLSocketFactory.getDefault();
        SSLSocket sslsocket = (SSLSocket) sslsocketfactory.createSocket("192.168.0.10", 12120);

        String[] newProtocols = {"TLSv1"};
        sslsocket.setEnabledProtocols(newProtocols);

        toServer = new PrintWriter(sslsocket.getOutputStream(), true);

        toServer.println("Data1\n");
        toServer.println("Data2\n");

        InputStreamReader isr = new InputStreamReader(sslsocket.getInputStream());
        fromServer = new BufferedReader(isr, 1);

        } catch (Exception exception) {

            exception.printStackTrace();
        }
   }
}

Answer 1

您不能在 Applet 中设置系统属性。您也无法访问本地文件 (keystore.jks) 系统(除非您请求特定权限)。

您可以将特殊参数传递给 JVM，如 documentation 中所述像这样:

<APPLET archive="my_applet.jar" code="MyApplet" width="300" height="300">
    <PARAM name="java_arguments" value="-Djavax.net.ssl.trustStore=keystore.jks">
</APPLET>

但同样，请注意访问本地文件所需的特殊权限。