java 动态编译源代码

代码非常简单，，要引入tool.jar这个包

com.sun.tools.javac.Main javac = new Main();

File file =new File("E:/work/JavaGGDS/bin/Test.java");// new File("Test",".java", );

   if(file.exists())file.delete();

   FileWriter fw=new FileWriter(file);

   fw.write("public class "+file.getName().substring(0,file.getName().lastIndexOf("."))+" { public static void a(){System.out.println(\"dddddddd\");}}");

   fw.flush();

   fw.close();

//   String[] arg0=new String[]{"-d",System.getProperty("user.dir"),file.getName()};

   String[] arg0=new String[]{"-d","E:/work/JavaGGDS/bin/","E:/work/JavaGGDS/bin/"+"Test.java"};

   int status=javac.compile(arg0);

   System.out.println(status);

   Class cls = Class.forName(file.getName().substring(0,file.getName().lastIndexOf(".")));

   cls.getMethod("a").invoke(null);