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);        }    }}

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