关于异常的工具类

我不是女神ヾ 2022-05-19 14:35 256阅读 0赞

import javax.servlet.http.HttpServletRequest;
    import java.io.PrintWriter;
    import java.io.StringWriter;
    
    /**
     * 关于异常的工具类.
     * @author calvin
     * @version 2014-8-19
     */
    public class ExceptionUtils {
    
    	/**
    	 * 在request中获取异常类
    	 * @param request
    	 * @return 
    	 */
    	public static Throwable getThrowable(HttpServletRequest request){
    		Throwable ex = null;
    		if (request.getAttribute("exception") != null) {
    			ex = (Throwable) request.getAttribute("exception");
    		} else if (request.getAttribute("javax.servlet.error.exception") != null) {
    			ex = (Throwable) request.getAttribute("javax.servlet.error.exception");
    		}
    		return ex;
    	}
    
    	/**
    	 * 将ErrorStack转化为String.
    	 */
    	public static String getStackTraceAsString(Throwable e) {
    		if (e == null){
    			return "";
    		}
    		StringWriter stringWriter = new StringWriter();
    		e.printStackTrace(new PrintWriter(stringWriter));
    		return stringWriter.toString();
    	}
    
    	/**
    	 * 判断异常是否由某些底层的异常引起.
    	 */
    	@SuppressWarnings("unchecked")
    	public static boolean isCausedBy(Exception ex, Class<? extends Exception>... causeExceptionClasses) {
    		Throwable cause = ex.getCause();
    		while (cause != null) {
    			for (Class<? extends Exception> causeClass : causeExceptionClasses) {
    				if (causeClass.isInstance(cause)) {
    					return true;
    				}
    			}
    			cause = cause.getCause();
    		}
    		return false;
    	}
    	
    	/**
    	 * 将CheckedException转换为UncheckedException.
    	 */
    	public static RuntimeException unchecked(Exception e) {
    		if (e instanceof RuntimeException) {
    			return (RuntimeException) e;
    		} else {
    			return new RuntimeException(e);
    		}
    	}
    	
    }