项目初始导入

src/main/java/com/nis/util/Exceptions.java

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+/**
+ * Copyright (c) 2005-2012 springside.org.cn
+ */
+package com.nis.util;
+
+import java.io.PrintWriter;
+import java.io.StringWriter;
+
+import javax.servlet.http.HttpServletRequest;
+
+/**
+ * 关于异常的工具类.
+ * @author calvin
+ * @version 2013-01-15
+ */
+public class Exceptions {
+
+	/**
+	 * 将CheckedException转换为UncheckedException.
+	 */
+	public static RuntimeException unchecked(Exception e) {
+		if (e instanceof RuntimeException) {
+			return (RuntimeException) e;
+		} else {
+			return new RuntimeException(e);
+		}
+	}
+
+	/**
+	 * 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.
+	 */
+	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;
+	}
+
+	/**
+	 * 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;
+	}
+	
+}