动态编译 Java 文件 与 动态加载 Java 类

原文：http://hi.baidu.com/helloween0809/blog/item/709c8126e7edb2148a82a12e.html动态编译java文件 动态加载java类 动态执行java类的main方法。
动态编译需要加载 JDK/lib/tools.jar
下面是代码： 点击(此处)折叠或打开
/*

 * IBM Confidential

 *

 * OCO Source Materials

 *

 * #ID# IBM CRL Supply Chain Management Research

 *

 * (C) Copyright IBM Corp. 2005, 2006

 *

 * The source code for this program is not published or otherwise divested of

 * its trade secrets.

 *

 */

 package test;

import java.io.File;

 import java.io.FileOutputStream;

 import java.lang.reflect.Method;

 import java.net.URL;

 import java.net.URLClassLoader;

public class CompileTest

 {

    public static void main(String[] args)

             throws Exception

     {

         String className = "Test";

        File file = new File(new File(System.getProperty("user.dir")),

                 className + ".java");

        StringBuffer sb = new StringBuffer();

        sb.append("public class " + className + " { \r\n");

         sb.append(" public static void main(java.lang.String[] args) throws Exception { \r\n");

         sb.append(" System.out.println(\"This is a class compiled. ");

         sb.append(" class: \" + " + className + ".class.newInstance()); \r\n");

         sb.append(" } \r\n");

         sb.append("} \r\n");

        FileOutputStream ous = new FileOutputStream(file);

         ous.write(sb.toString().getBytes());

         ous.close();

        String[] arguments = new String[] { "-d",

                 System.getProperty("user.dir"), className + ".java" };

        // Compile

         int result = com.sun.tools.javac.Main.compile(arguments);

        System.out.println(result == 0 ? "Compiled successly" : "Failed");

        URL classpath = new URL("file:/" + System.getProperty("user.dir") + "/");

        URLClassLoader classLoader = new URLClassLoader(new URL[] { classpath });

        // Load

         Class testClass = classLoader.loadClass(className);

        Method mainMethod = testClass.getMethod("main",

                 new Class[] { String[].class });

        // Invoke main(String[] args)

         System.out.println(mainMethod);

         

         testClass.newInstance();

        mainMethod.invoke(null, new Object[] { null });

    }

 }

运行结果：
Compiled successly public static void Test.main(java.lang.String[]) throws java.lang.Exception This is a class compiled.              class: Test@fc9944


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