struts2 验证框架 查找验证文件源码
public class DefaultValidatorFactory implements ValidatorFactory { protected Map<String, String> validators = new HashMap<String, String>(); private static Logger LOG = LoggerFactory.getLogger(DefaultValidatorFactory.class); protected ObjectFactory objectFactory; protected ValidatorFileParser validatorFileParser; @Inject public DefaultValidatorFactory(@Inject ObjectFactory objectFactory, @Inject ValidatorFileParser parser) { this.objectFactory = objectFactory; this.validatorFileParser = parser; parseValidators(); } public Validator getValidator(ValidatorConfig cfg) { String className = lookupRegisteredValidatorType(cfg.getType()); Validator validator; try { // instantiate the validator, and set configured parameters //todo - can this use the ThreadLocal? validator = objectFactory.buildValidator(className, cfg.getParams(), null); // ActionContext.getContext().getContextMap()); } catch (Exception e) { final String msg = "There was a problem creating a Validator of type " + className + " : caused by " + e.getMessage(); throw new XWorkException(msg, e, cfg); } // set other configured properties validator.setMessageKey(cfg.getMessageKey()); validator.setDefaultMessage(cfg.getDefaultMessage()); validator.setMessageParameters(cfg.getMessageParams()); if (validator instanceof ShortCircuitableValidator) { ((ShortCircuitableValidator) validator).setShortCircuit(cfg.isShortCircuit()); } return validator; } public void registerValidator(String name, String className) { if (LOG.isDebugEnabled()) { LOG.debug("Registering validator of class " + className + " with name " + name); } validators.put(name, className); } public String lookupRegisteredValidatorType(String name) { // lookup the validator class mapped to the type name String className = validators.get(name); if (className == null) { throw new IllegalArgumentException("There is no validator class mapped to the name " + name); } return className; } //看这里的方法 private void parseValidators() { if (LOG.isDebugEnabled()) { LOG.debug("Loading validator definitions."); } List<File> files = new ArrayList<File>(); try { // Get custom validator configurations via the classpath Iterator<URL> urls = ClassLoaderUtil.getResources("", DefaultValidatorFactory.class, false); while (urls.hasNext()) { URL u = urls.next(); try { URI uri = new URI(u.toExternalForm().replaceAll(" ", "%20")); if (!uri.isOpaque() && "file".equalsIgnoreCase(uri.getScheme())) { File f = new File(uri); FilenameFilter filter = new FilenameFilter() { public boolean accept(File file, String fileName) { return fileName.contains("-validators.xml");//ladies and 乡亲们和对面的女孩们看过来 } }; // First check if this is a directory // If yes, then just do a "list" to get all files in this directory // and match the filenames with *-validators.xml. If the filename // matches then add to the list of files to be parsed if (f.isDirectory()) { files.addAll(Arrays.asList(f.listFiles(filter))); } else { // If this is not a directory, then get hold of the inputstream. // If its not a ZipInputStream, then create a ZipInputStream out // of it. The intention is to allow nested jar files to be scanned // for *-validators.xml. // Ex: struts-app.jar -> MyApp.jar -> Login-validators.xml should be // parsed and loaded. ZipInputStream zipInputStream = null; try { InputStream inputStream = u.openStream(); if (inputStream instanceof ZipInputStream) { zipInputStream = (ZipInputStream) inputStream; } else { zipInputStream = new ZipInputStream(inputStream); } ZipEntry zipEntry = zipInputStream.getNextEntry(); while (zipEntry != null) { if (zipEntry.getName().endsWith("-validators.xml")) { if (LOG.isTraceEnabled()) { LOG.trace("Adding validator " + zipEntry.getName()); } files.add(new File(zipEntry.getName())); } zipEntry = zipInputStream.getNextEntry(); } } finally { //cleanup if (zipInputStream != null) { zipInputStream.close(); } } } } } catch (Exception ex) { LOG.error("Unable to load #0", ex, u.toString()); } } } catch (IOException e) { throw new ConfigurationException("Unable to parse validators", e); } // Parse default validator configurations String resourceName = "com/opensymphony/xwork2/validator/validators/default.xml"; retrieveValidatorConfiguration(resourceName); // Overwrite and extend defaults with application specific validator configurations resourceName = "validators.xml"; retrieveValidatorConfiguration(resourceName); // Add custom (plugin) specific validator configurations for (File file : files) { retrieveValidatorConfiguration(file.getName()); } } private void retrieveValidatorConfiguration(String resourceName) { InputStream is = ClassLoaderUtil.getResourceAsStream(resourceName, DefaultValidatorFactory.class); if (is != null) { validatorFileParser.parseValidatorDefinitions(validators, is, resourceName); } }}?