提交 java代码

package aaa;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.lang.reflect.Method;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.Scanner;

import sun.security.tools.keytool.Main;
import java.util.regex.Pattern;

import javax.tools.JavaCompiler;
import javax.tools.ToolProvider;


public class TestJava {
	
	public static void main(String[] args) throws IOException {

        //1、通过JavaCompiler动态编译
        JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
        int result = compiler.run(null,null,null,"d:/JAVA/test/Abc.java");
        System.out.println(result==0?"编译成功":"编译失败");

        //通过IO流操作，将字符串存储成一个临时文件，然后调用动态编译方法！
        String str = "public class Hi { public static void main(String[] args){System.out.println(\"HAHA\");}}";
        //此处省略一大段代码。。。

        //2、通过Runtime.getRuntime()运行启动新的进程动态运行编译好的类
        Runtime run = Runtime.getRuntime();
        Process process = run.exec("java -cp d:/JAVA/test Abc");
        InputStream in = process.getInputStream();
        BufferedReader reader = new BufferedReader(new InputStreamReader(in));
        String info = "";
        while ((info=reader.readLine())!=null) {
            System.out.println(info);
        }

        //3、通过反射运行编译好的类
        try {
            URL[] urls = new URL[] {new URL("file:/" + "f:/JAVA/test/")};
            URLClassLoader loader = new URLClassLoader(urls);
            Class c = loader.loadClass("HelloWorld");
            //调用加载类的main方法
            Method m = c.getMethod("main", String[].class);
            m.invoke(null, (Object)new String[]{});
            //m.invoke(null, new String[]{"a","b"});
            //上面代码会被编译成：m.invoke(null,"a","b"),这样就发生参数个数不匹配的问题
            //因此，必须加上(Object)进行转型，避免这个问题
        } catch (Exception e) {
            e.printStackTrace();
        }
    
	}

}