java动态编译-jdk自带工具类

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1、Java动态编译-JDK自带工具类packageorg.mania.finalcode.compile;importjava.io.ByteArrayOutputStream;importjava.io.File;importjava.io.IOException;importjava.io.OutputStream;importjava.io.PrintWriter;importjava.io.StringWriter;importjava.net.URI;importjava.net.URL;importjava.net.URLClassLoader;impo

2、rtjava.util.ArrayList;importjava.util.List;importjavax.tools.Diagnostic;importjavax.tools.DiagnosticCollector;importjavax.tools.FileObject;importjavax.tools.ForwardingJavaFileManager;importjavax.tools.JavaCompiler;importjavax.tools.JavaFileObject;importjavax.tools.JavaFileObject.Kind;

3、importjavax.tools.SimpleJavaFileObject;importjavax.tools.StandardJavaFileManager;importjavax.tools.ToolProvider;publicclassMemoryCompiler{staticclassMemoryClassLoaderextendsURLClassLoader{MemoryClassLoader(){super(newURL[0]);}publicClassdefineMemoryClass(Stringname,byte[]b){returns

4、uper.defineClass(name,b,0,b.length);}}publicstaticvoidmain(String[]args)throwsInstantiationException,IllegalAccessException{StringWritersw=newStringWriter();PrintWriterpw=newPrintWriter(sw);pw.println("publicclassA{");pw.println("publicStringtoString(){");pw.println("return"Test";")

5、;pw.println("}");pw.println("}");Classc=getInstance().compile("A",sw.toString());System.out.println(c);Objecto=c.newInstance();System.out.println(o);}privatestaticMemoryCompilerinstance=newMemoryCompiler();privateMemoryClassLoaderclassloader=newMemoryClassLoader();privateStringclas

6、spath=System.getProperty("java.class.path");privateStringencoding=System.getProperty("file.encoding");publicstaticMemoryCompilergetInstance(){returninstance;}privateMemoryCompiler(){ClassLoadercl=MemoryClassLoader.class.getClassLoader();if(clinstanceofURLClassLoader){StringBuildersb=n

7、ewStringBuilder();for(URLurl:((URLClassLoader)cl).getURLs()){Stringp=url.getFile();sb.append(p).append(File.pathSeparator);}this.classpath=sb.toString();}}publicClasscompile(finalStringclassname,finalStringsource){returncompile(classname,source,null);}publicClasscompile(finalStr

8、ingcl