Java Constants.NEWLINE属性代码示例

/**
 * <p>Attempts to construct a JasperException that contains helpful information
 * about what went wrong. Uses the JSP compiler system to translate the line
 * number in the generated servlet that originated the exception to a line
 * number in the JSP.  Then constructs an exception containing that
 * information, and a snippet of the JSP to help debugging.
 * Please see http://bz.apache.org/bugzilla/show_bug.cgi?id=37062 and
 * http://www.tfenne.com/jasper/ for more details.
 *</p>
 *
 * @param ex the exception that was the cause of the problem.
 * @return a JasperException with more detailed information
 */
protected JasperException handleJspException(Exception ex) {
    try {
        Throwable realException = ex;
        if (ex instanceof ServletException) {
            realException = ((ServletException) ex).getRootCause();
        }

        // First identify the stack frame in the trace that represents the JSP
        StackTraceElement[] frames = realException.getStackTrace();
        StackTraceElement jspFrame = null;

        for (int i=0; i<frames.length; ++i) {
            if ( frames[i].getClassName().equals(this.getServlet().getClass().getName()) ) {
                jspFrame = frames[i];
                break;
            }
        }

        
        if (jspFrame == null ||
                this.ctxt.getCompiler().getPageNodes() == null) {
            // If we couldn't find a frame in the stack trace corresponding
            // to the generated servlet class or we don't have a copy of the
            // parsed JSP to hand, we can't really add anything
            return new JasperException(ex);
        }

        int javaLineNumber = jspFrame.getLineNumber();
        JavacErrorDetail detail = ErrorDispatcher.createJavacError(
                jspFrame.getMethodName(),
                this.ctxt.getCompiler().getPageNodes(),
                null,
                javaLineNumber,
                ctxt);

        // If the line number is less than one we couldn't find out
        // where in the JSP things went wrong
        int jspLineNumber = detail.getJspBeginLineNumber();
        if (jspLineNumber < 1) {
            throw new JasperException(ex);
        }

        if (options.getDisplaySourceFragment()) {
            return new JasperException(Localizer.getMessage
                    ("jsp.exception", detail.getJspFileName(),
                            "" + jspLineNumber) + Constants.NEWLINE +
                            Constants.NEWLINE + detail.getJspExtract() +
                            Constants.NEWLINE + Constants.NEWLINE + 
                            "Stacktrace:", ex);
            
        }

        return new JasperException(Localizer.getMessage
                ("jsp.exception", detail.getJspFileName(),
                        "" + jspLineNumber), ex);
    } catch (Exception je) {
        // If anything goes wrong, just revert to the original behaviour
        if (ex instanceof JasperException) {
            return (JasperException) ex;
        }
        return new JasperException(ex);
    }
}
 

/**
 * <p>
 * Attempts to construct a JasperException that contains helpful information
 * about what went wrong. Uses the JSP compiler system to translate the line
 * number in the generated servlet that originated the exception to a line
 * number in the JSP. Then constructs an exception containing that
 * information, and a snippet of the JSP to help debugging. Please see
 * http://bz.apache.org/bugzilla/show_bug.cgi?id=37062 and
 * http://www.tfenne.com/jasper/ for more details.
 * </p>
 *
 * @param ex
 *            the exception that was the cause of the problem.
 * @return a JasperException with more detailed information
 */
protected JasperException handleJspException(Exception ex) {
	try {
		Throwable realException = ex;
		if (ex instanceof ServletException) {
			realException = ((ServletException) ex).getRootCause();
		}

		// First identify the stack frame in the trace that represents the
		// JSP
		StackTraceElement[] frames = realException.getStackTrace();
		StackTraceElement jspFrame = null;

		for (int i = 0; i < frames.length; ++i) {
			if (frames[i].getClassName().equals(this.getServlet().getClass().getName())) {
				jspFrame = frames[i];
				break;
			}
		}

		if (jspFrame == null || this.ctxt.getCompiler().getPageNodes() == null) {
			// If we couldn't find a frame in the stack trace corresponding
			// to the generated servlet class or we don't have a copy of the
			// parsed JSP to hand, we can't really add anything
			return new JasperException(ex);
		}

		int javaLineNumber = jspFrame.getLineNumber();
		JavacErrorDetail detail = ErrorDispatcher.createJavacError(jspFrame.getMethodName(),
				this.ctxt.getCompiler().getPageNodes(), null, javaLineNumber, ctxt);

		// If the line number is less than one we couldn't find out
		// where in the JSP things went wrong
		int jspLineNumber = detail.getJspBeginLineNumber();
		if (jspLineNumber < 1) {
			throw new JasperException(ex);
		}

		if (options.getDisplaySourceFragment()) {
			return new JasperException(
					Localizer.getMessage("jsp.exception", detail.getJspFileName(), "" + jspLineNumber)
							+ Constants.NEWLINE + Constants.NEWLINE + detail.getJspExtract() + Constants.NEWLINE
							+ Constants.NEWLINE + "Stacktrace:",
					ex);

		}

		return new JasperException(
				Localizer.getMessage("jsp.exception", detail.getJspFileName(), "" + jspLineNumber), ex);
	} catch (Exception je) {
		// If anything goes wrong, just revert to the original behaviour
		if (ex instanceof JasperException) {
			return (JasperException) ex;
		}
		return new JasperException(ex);
	}
}