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【Java】动态编译本地java文件

作者:PorcoGT / 发布于2015/4/8/ 536


	package file;
	
	import java.io.BufferedReader;
	import java.io.IOException;
	import java.io.InputStream;
	import java.io.InputStreamReader;
	import java.io.PrintWriter;
	import java.io.StringWriter;
	import java.lang.reflect.Method;
	import java.net.URL;
	import java.net.URLClassLoader;
	
	import javax.tools.JavaCompiler;
	import javax.tools.StandardJavaFileManager;
	import javax.tools.ToolProvider;
	import javax.tools.JavaCompiler.CompilationTask;
	
	public class DongTaiBianYi {
	
	 /**
	 * @param args
	 * @throws Exception
	 * ￥-824.40 -824.40
	 */
	 public static void main(String[] args) throws Exception {
	 // TODO Auto-generated method stub
	 DongTaiBianYi dtby = new DongTaiBianYi();
	 //dtby.textJavaCompiler();
	 //dtby.textStringWrite();
	
	 }
	
	 public void textJavaCompiler() throws IOException{
	 // 编译程序
	 JavaCompiler javaCompiler = ToolProvider.getSystemJavaCompiler();
	 int result = javaCompiler.run(null, null, null, "-d","./src/","./src/file/MyText.java");
	 System.out.println( result == 0 ? "恭喜编译成功" : "对不起编译失败");
	
	 }
	
	 public void textStringWrite() throws Exception{
	 JavaCompiler complier = ToolProvider.getSystemJavaCompiler();
	 StandardJavaFileManager sjf =
	 complier.getStandardFileManager(null, null, null);
	 Iterable it = sjf.getJavaFileObjects("D:/Hello.java");
	 CompilationTask task = complier.getTask(null, sjf, null, null, null, it);
	 task.call(); //调用创建 ,创建class文件
	 sjf.close();
	
	 URL urls[] = new URL[]{ new URL("file:/D:/")}; //储存文件目录的地址
	 URLClassLoader uLoad = new URLClassLoader(urls); //classloader从哪个目录找？
	 //uLoad.loadClass("Hello");
	 Class c = uLoad.loadClass("Hello"); //找哪个class文件 注意不带后缀名
	 //c.newInstance(); //创建一个实例
	
	 Method method = c.getMethod("printString");
	 String string = method.invoke(c.newInstance()).toString();
	 System.out.println(string);
	 }
	
	}

	

	

	

	Hello.java

	package entity;
	
	public class Hello {
	
	 public void printString(){
	 System.out.println("Hello word!");
	 }
	
	}

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