/**
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* Copyright (c) 2005-2012 springside.org.cn
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*/
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package com.jeeplus.common.utils;
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import java.io.PrintWriter;
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import java.io.StringWriter;
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import javax.servlet.http.HttpServletRequest;
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/**
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* 关于异常的工具类.
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* @author calvin
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* @version 2013-01-15
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*/
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public class Exceptions {
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/**
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* 将CheckedException转换为UncheckedException.
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*/
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public static RuntimeException unchecked(Exception e) {
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if (e instanceof RuntimeException) {
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return (RuntimeException) e;
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} else {
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return new RuntimeException(e);
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}
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}
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/**
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* 将ErrorStack转化为String.
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*/
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public static String getStackTraceAsString(Throwable e) {
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if (e == null){
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return "";
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}
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StringWriter stringWriter = new StringWriter();
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e.printStackTrace(new PrintWriter(stringWriter));
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return stringWriter.toString();
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}
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/**
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* 判断异常是否由某些底层的异常引起.
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*/
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public static boolean isCausedBy(Exception ex, Class<? extends Exception>... causeExceptionClasses) {
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Throwable cause = ex.getCause();
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while (cause != null) {
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for (Class<? extends Exception> causeClass : causeExceptionClasses) {
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if (causeClass.isInstance(cause)) {
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return true;
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}
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}
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cause = cause.getCause();
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}
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return false;
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}
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/**
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* 在request中获取异常类
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* @param request
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* @return
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*/
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public static Throwable getThrowable(HttpServletRequest request){
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Throwable ex = null;
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if (request.getAttribute("exception") != null) {
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ex = (Throwable) request.getAttribute("exception");
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} else if (request.getAttribute("javax.servlet.error.exception") != null) {
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ex = (Throwable) request.getAttribute("javax.servlet.error.exception");
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}
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return ex;
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}
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}
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