動態註冊java腳本到系統，獲得其class

• 話不多說，上工具類

    /**
     * 裝載字符串成爲java可執行文件
     *
     * @param className className
     * @param javaCodes javaCodes
     * @return Class
     */
    private Class<?> dynamicClassByNameAndCode(String className, String javaCodes)
    {
        JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
        StandardJavaFileManager fileManager = compiler.getStandardFileManager(null, null, null);
        StrSrcJavaObject srcObject = new StrSrcJavaObject(className, javaCodes);
        Iterable<? extends JavaFileObject> fileObjects = Arrays.asList(srcObject);
        String flag = "-d";
        String outDir = "";
        try
        {
            File classPath = new File(Thread.currentThread().getContextClassLoader().getResource("").toURI());
            outDir = classPath.getAbsolutePath() + File.separator;
        }
        catch (URISyntaxException e1)
        {
            e1.printStackTrace();
        }
        Iterable<String> options = Arrays.asList(flag, outDir);
        JavaCompiler.CompilationTask task = compiler.getTask(null, fileManager, null, options, null, fileObjects);
        boolean result = task.call();
        if (result == true)
        {
            try
            {
                return Class.forName(className);
            }
            catch (ClassNotFoundException e)
            {
                e.printStackTrace();
            }
        }
        return null;
    }

    private static class StrSrcJavaObject extends SimpleJavaFileObject
    {
        private String content;

        StrSrcJavaObject(String name, String content)
        {
            super(URI.create("string:///" + name.replace('.', '/') + Kind.SOURCE.extension), Kind.SOURCE);
            this.content = content;
        }

        @Override
        public CharSequence getCharContent(boolean ignoreEncodingErrors)
        {
            return content;
        }
    }

• 調用方法 

Class<?> clazz = dynamicClassByNameAndCode(this.serviceClassName, scriptCodes);