add:添加点奇怪的东西

Author: “threedr3am”

java-compile/src/main/java/com/threedr3am/bug/compile/javac/CustomJavaFileObject.java

@@ -1,8 +1,11 @@
 package com.threedr3am.bug.compile.javac;
 
 import java.io.IOException;
+import java.net.MalformedURLException;
 import java.net.URI;
 import java.net.URISyntaxException;
+import java.net.URL;
+import java.net.URLClassLoader;
 import java.nio.charset.Charset;
 import java.util.Arrays;
 import java.util.List;
@@ -11,9 +14,11 @@
 import javax.tools.DiagnosticCollector;
 import javax.tools.JavaCompiler;
 import javax.tools.JavaCompiler.CompilationTask;
+import javax.tools.JavaFileManager.Location;
 import javax.tools.JavaFileObject;
 import javax.tools.SimpleJavaFileObject;
 import javax.tools.StandardJavaFileManager;
+import javax.tools.StandardLocation;
 import javax.tools.ToolProvider;
 
 /**
@@ -29,14 +34,21 @@ public static void e() throws URISyntaxException {
         StandardJavaFileManager standardJavaFileManager = javaCompiler
             .getStandardFileManager(diagnostics, Locale.CHINA, Charset.forName("utf-8"));
 //        FileManagerImpl fileManager = new FileManagerImpl(standardJavaFileManager);
+//        StringBuilder stringBuilder = new StringBuilder()
+//            .append("class Main {")
+//            .append("   public static void main(String[] args) {")
+//            .append("       System.out.println(\"hello FFF!\");")
+//            .append("   }")
+//            .append("}");
         StringBuilder stringBuilder = new StringBuilder()
             .append("class Main {")
-            .append("   public static void main(String[] args) {")
+            .append("   static {")
             .append("       System.out.println(\"hello FFF!\");")
             .append("   }")
             .append("}");
+        JavaFileObject javaFileObject = new JavaObjectFromString("tmp.Main", stringBuilder.toString());
         Iterable<? extends JavaFileObject> javaFileObjects = Arrays
-            .asList(new JavaObjectFromString("Main", stringBuilder.toString()));
+            .asList(javaFileObject);
 
         // 编译任务
         CompilationTask task = javaCompiler.getTask(null, standardJavaFileManager, diagnostics, null, null, javaFileObjects);
@@ -47,6 +59,14 @@ public static void e() throws URISyntaxException {
             Diagnostic d = (Diagnostic) object;
             System.out.println(d.getMessage(Locale.ENGLISH));
         }
+
+        try {
+            new URLClassLoader(new URL[]{javaFileObject.toUri().toURL()}).loadClass("Main");
+        } catch (ClassNotFoundException e) {
+            e.printStackTrace();
+        } catch (MalformedURLException e) {
+            e.printStackTrace();
+        }
     }
 
     public static void main(String[] args) throws URISyntaxException {

java-compile/src/main/java/com/threedr3am/bug/compile/javac/RuntimeMakeClass.java

@@ -0,0 +1,78 @@
+package com.threedr3am.bug.compile.javac;
+
+import java.io.IOException;
+import java.lang.reflect.Field;
+import java.net.MalformedURLException;
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.net.URL;
+import java.net.URLClassLoader;
+import java.nio.charset.Charset;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.util.Arrays;
+import java.util.List;
+import java.util.Locale;
+import java.util.Map;
+import java.util.Random;
+import javax.tools.Diagnostic;
+import javax.tools.DiagnosticCollector;
+import javax.tools.JavaCompiler;
+import javax.tools.JavaCompiler.CompilationTask;
+import javax.tools.JavaFileObject;
+import javax.tools.SimpleJavaFileObject;
+import javax.tools.StandardJavaFileManager;
+import javax.tools.ToolProvider;
+
+/**
+ * @author threedr3am
+ */
+public class RuntimeMakeClass {
+
+    //使用了自定义JavaFileObject实现的动态编译
+    public void e() throws IOException {
+        JavaCompiler javaCompiler = ToolProvider.getSystemJavaCompiler();
+        DiagnosticCollector<JavaFileObject> diagnostics = new DiagnosticCollector();
+        StandardJavaFileManager standardJavaFileManager = javaCompiler
+            .getStandardFileManager(diagnostics, Locale.CHINA, Charset.forName("utf-8"));
+        int id = new Random().nextInt(10000000);
+        StringBuilder stringBuilder = new StringBuilder()
+            .append("import java.io.BufferedReader;\n")
+            .append("import java.io.IOException;\n")
+            .append("import java.io.InputStream;\n")
+            .append("import java.io.InputStreamReader;\n")
+            .append("public class Threedr3am" + id + " {\n")
+            .append("   public static String result = \"\";\n")
+            .append("   static {\n")
+            .append("        try {")
+            .append("               StringBuilder stringBuilder = new StringBuilder();\n")
+            .append("               BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(Runtime.getRuntime().exec(\"" + "ls" + "\").getInputStream()));\n")
+            .append("               String line;\n")
+            .append("               while((line = bufferedReader.readLine()) != null) {\n")
+            .append("                       stringBuilder.append(line).append(\"\\n\");\n")
+            .append("               }\n")
+            .append("               result = stringBuilder.toString();\n")
+            .append("        } catch (Exception e) {\n")
+            .append("              e.printStackTrace();\n")
+            .append("        }\n")
+            .append("   }\n")
+            .append("}");
+        String classPath = "/tmp/";
+        Files.write(Paths.get(classPath + "Threedr3am" +id + ".java"), stringBuilder.toString().getBytes());
+        Iterable fileObject = standardJavaFileManager.getJavaFileObjects(classPath + "Threedr3am" +id + ".java");
+        javaCompiler.getTask(null, standardJavaFileManager, diagnostics, null, null, fileObject).call();
+        try {
+            System.out.println(new URLClassLoader(new URL[]{new URL("file:" + classPath)}).loadClass("Threedr3am" + id).getField("result").get(null));
+        } catch (ClassNotFoundException e) {
+            e.printStackTrace();
+        } catch (NoSuchFieldException e) {
+            e.printStackTrace();
+        } catch (IllegalAccessException e) {
+            e.printStackTrace();
+        }
+    }
+
+    public static void main(String[] args) throws IOException {
+        new RuntimeMakeClass().e();
+    }
+}