java动态编译源代码并调用其中的方法

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package proxy;import java.lang.reflect.Constructor;import java.net.URL;import java.net.URLClassLoader;import javax.tools.JavaCompiler;import javax.tools.JavaFileObject;import javax.tools.StandardJavaFileManager;import javax.tools.ToolProvider;public class MyCompiler {/** * @param args */public static void main(String[] args) throws Exception {//编译java源代码JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();StandardJavaFileManager fileManager = compiler.getStandardFileManager(null, null, null);String fileName = System.getProperty("user.dir")+"/src/proxy/Hello.java";Iterable<? extends JavaFileObject> compilationUnits = fileManager.getJavaFileObjects(fileName);JavaCompiler.CompilationTask task = compiler.getTask(null, fileManager,null, null, null, compilationUnits);Boolean success = task.call();fileManager.close();System.out.println("Success: " + success);//load into memory and instanceURL[] urls = new URL[]{new URL("file:/"+ System.getProperty("user.dir")+"/src")};System.out.println(urls[0]);URLClassLoader ucl = new URLClassLoader(urls);Class c = ucl.loadClass("proxy.Hello");System.out.println(c);Constructor constructor = c.getConstructor(null);Hello o = (Hello)constructor.newInstance(null);//调用具体的方法o.test();}}

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