Java 动态编译

package test;

import java.io.*;
import java.lang.reflect.*;
import java.io.File;
import java.net.URL;
import java.net.URLClassLoader;

public class CompileTest {

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

    public static void main(String[] args) {
        try {
            String strClassname = "Test1";
            String strFile=System.getProperty("user.dir")+"\\"+strClassname+".java";
            File file =new File(strFile);
            ////File.createTempFile("RunTime", ".java", new File(System.getProperty("user.dir")));
            String filename = file.getName();
            PrintWriter out = new PrintWriter(new FileOutputStream(file));
            out.println("public class " + strClassname + "{\n");
            out.println("public static void main(String[] args){\n");
            out.println("System.out.println(\"你好！\");\n");
            out.println("}\n}\n");
            out.flush();
            out.close();
            String[] arg = new String[]{"-d", System.getProperty("user.dir"), filename};
            //String[] arg = new String[]{"-d", System.getProperty("user.dir")+"/build/classes", filename};
            javac.compile(arg);
            
            URL classpath = new URL("file:/" + System.getProperty("user.dir") + "/");
            URLClassLoader classLoader = new URLClassLoader(new URL[] { classpath });
            Class cls = classLoader.loadClass(strClassname);
            Method main = cls.getMethod("main", new Class[]{String[].class});
            main.invoke(null, new Object[]{new String[0]});
            file.delete();
        } catch (Exception e) {
            e.printStackTrace();
        }

    }
}

Java动态编译，以后可以整合到FS中