e513. handling errors while parsing an xml file.txt

这里面包含了一百多个JAVA源文件

This example installs an error handler to a parser. The error handler logs error messages to a logger (see e385 The Quintessential Logging Program). 
    // Create a builder
    DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
    
    // Set an error listener
    builder.setErrorHandler(new MyErrorHandler());
    
    // Use the builder to parse the file
    Document doc = builder.parse(new File("infilename.xml"));
    } catch (SAXException e) {
        // A parsing error occurred; the xml input is not valid.
        // This exception can still be thrown, even if an error handler is installed.
    } catch (ParserConfigurationException e) {
    } catch (IOException e) {
    }
    
    // This error handler uses a Logger to log error messages
    class MyErrorHandler implements ErrorHandler {
        //  This method is called in the event of a recoverable error
        public void error(SAXParseException e) {
            log(Level.SEVERE, "Error", e);
        }
    
        //  This method is called in the event of a non-recoverable error
        public void fatalError(SAXParseException e) {
            log(Level.SEVERE, "Fatal Error", e);
        }
    
        //  This method is called in the event of a warning
        public void warning(SAXParseException e) {
            log(Level.WARNING, "Warning", e);
        }
    
        // Get logger to log errors
        private Logger logger = Logger.getLogger("com.mycompany");
    
        // Dump a log record to a logger
        private void log(Level level, String message, SAXParseException e) {
            // Get details
            int line = e.getLineNumber();
            int col = e.getColumnNumber();
            String publicId = e.getPublicId();
            String systemId = e.getSystemId();
    
            // Append details to message
            message = message + ": " + e.getMessage() + ": line="
                + line + ", col=" + col + ", PUBLIC="
                + publicId + ", SYSTEM=" + systemId;
    
            // Log the message
            logger.log(level, message);
        }
    }

Given the following input file, MyErrorHandler.fatalError() is called and parse() throws a SAXParseException as well. 
    <!-- invalid XML -->
    <root>
       <element>
    </root>