Gets all classes (scan file directory and all jars) that inherit or implement an interface under the specified package name

ImportJava.io.File;ImportJava.io.FileFilter;Importjava.io.IOException;Importjava.net.JarURLConnection;ImportJava.net.URL;ImportJava.net.URLDecoder;Importjava.util.Enumeration;ImportJava.util.Iterator;ImportJava.util.LinkedHashSet;ImportJava.util.Set;ImportJava.util.jar.JarEntry;ImportJava.util.jar.JarFile;/*** Created by Fanlinlong on 2017/4/13.*/ Public classItest { Public Static voidMain (string[] args) {//Package the following classset<class<?>> classes = getclasses ("Com.packge"); if(Classes = =NULL) {System.out.printf ("NULL"); } Else{System.out.printf (classes.size ()+ ""); //subclass of a class or interfaceset<class<?>> ininterface = Getbyinterface (Basebean.class, classes); System.out.printf (Ininterface.size ()+ ""); }    }    /*** Get all the class * * from the package@paramPack *@return     */     Public StaticSet<class<?>>getclasses (String pack) {//A collection of the first class classset<class<?>> classes =NewLinkedhashset<class<?>>(); //whether to loop iterations        Booleanrecursive =true; //get the name of the package and replace itString PackageName =pack; String Packagedirname= Packagename.replace ('. ', '/')); //defines a set of enumerations to be combined to loop through the things in this directoryEnumeration<url>dirs; Try{dirs=Thread.CurrentThread (). Getcontextclassloader (). Getresources (Packagedirname); //Loop Iteration down             while(Dirs.hasmoreelements ()) {//gets the next elementURL url =dirs.nextelement (); //get the name of the agreementString protocol =Url.getprotocol (); //if it is saved as a file on the server                if("File". Equals (protocol)) {System.err.println ("File type of Scan"); //get the physical path of the packageString FilePath = Urldecoder.decode (Url.getfile (), "UTF-8"); //scan files under the entire package in a file and add them to the collectionfindandaddclassesinpackagebyfile (PackageName, FilePath, recursive, Clas                SES); } Else if("Jar". Equals (protocol)) {                    //if it is a jar package file//Define a Jarfile//System.err.println ("Jar type Scan");jarfile jar; Try {                        //Get JarJar =( (Jarurlconnection) url.openconnection ()). Getjarfile (); //get an enumeration class from this jar packageenumeration<jarentry> entries =jar.entries (); //the same iteration of the loop                         while(Entries.hasmoreelements ()) {//get an entity in the jar can be a directory and some other files in the jar package such as meta-inf filesJarentry entry =entries.nextelement (); String name=Entry.getname (); //if it's A/start                            if(Name.charat (0) = = '/') {                                //gets the following stringName = name.substring (1); }                            //if the first part and the defined package name are the same                            if(Name.startswith (packagedirname)) {intIDX = Name.lastindexof ('/'); //If the end of the "/" is a package                                if(idx! =-1) {                                    //Get the package name replace "/" with "."PackageName = name.substring (0, IDX). Replace (‘/‘, ‘.‘); }                                //If you can iterate and be a package                                if(idx! =-1) | |recursive) {                                    //if it is a. class file and is not a directory                                    if(Name.endswith (". Class"))                                            &&!entry.isdirectory ()) {                                        //remove the ". Class" from the back to get the real class nameString ClassName =name.substring (packagename.length ()+ 1, name. Length ()+ P); Try {                                            //Add to ClassesClasses.add (Class. Forn Ame (PackageName+ '. ' +className)); } Catch(ClassNotFoundException e) {e.printstacktrace ();                        }                                    }                                }                            } }                    } Catch(IOException e) {//log.error ("Error getting file from Jar package while scanning user defined view");E.printstacktrace (); }                }            }        } Catch(IOException e) {e.printstacktrace (); }        returnclasses; }    /*** Get all the class * * under the package in the form of a file@paramPackageName *@paramPackagePath *@paramRecursive *@paramClasses*/     Public Static voidfindandaddclassesinpackagebyfile (String PackageName, String p Ackagepath,Final BooleanRecursive, set<class<?>>classes) {        //Gets the directory for this package to create a fileFile dir =NewFile (PackagePath); //If it does not exist or is not a directory, return directly        if(!dir.exists () | | |dir.isdirectory ()) {            //Log.warn ("User Defined package name" + PackageName + "without any files");            return; }        //if it exists, get all files under the package including directoryfile[] Dirfiles = Dir.listfiles (NewFileFilter () {//Custom Filter rules If you can loop (including subdirectories) or a file that ends in a. Class (Compiled Java class file)             Public BooleanAccept (file file) {return(Recursive &&file.isdirectory ())|| (File.getname (). EndsWith (". Class")));        }        }); //Loop All Files         for(File file:dirfiles) {//continue scanning if it is a directory            if(File.isdirectory ()) {Findandaddclassesinpackagebyfile (PackageName+ "." +file.getname (), File.getabsolutepath (), recursive, classes); } Else {                //If the Java class file is removed, the following. Class only leaves the class nameString className = File.getname (). substring (0, File.getname (). Length ()+ P); Try {                    //add to the collection//Classes.add (class.forname (PackageName + '. ' + className)); //after replying to the classmate's reminder, here with forname some bad, will trigger the static method, no use of ClassLoader load cleanClasses.add (Thread.CurrentThread (). Getcontextclassloader (). LoadClass (PackageName + '. ' +className)); } Catch(ClassNotFoundException e) {//log.error ("Add user Custom view class error cannot find this class of. class file");E.printstacktrace (); }            }        }    }    // --------------------------------------------------------------------------------------------------------@SuppressWarnings ({"Rawtypes", "unchecked"})     Public StaticSet<class<?>> Getbyinterface (Class clazz, set<class<?>>Classesall) {Set<Class<?>> classes =NewLinkedhashset<class<?>>(); //gets the implementation class for the specified interface        if(!Clazz.isinterface ()) {            Try {                /*** Loop to determine whether all classes under the path inherit the specified class * and exclude the parent class themselves*/Iterator<Class<?>> iterator =Classesall.iterator ();  while(Iterator.hasnext ()) {Class<?> CLS =Iterator.next (); /*** IsAssignableFrom The method, please refer to the blog: *http://blog.csdn.net/u010156024/article/details/44875195                     */                    if(Clazz.isassignablefrom (CLS)) {if(!clazz.equals (CLS)) {//not in itself .Classes.add (CLS); } Else {                        }                    }                }            } Catch(Exception e) {System.out.println ("Exception occurred"); }        }        returnclasses; }}

Gets all classes (scan file directory and all jars) that inherit or implement an interface under the specified package name