获得java.lang.Throwable错误堆栈信息

在java语言中java.lang.Throwable是所有error、exception的父类。异常体系对于问题的查找、编码的实现都是非常有帮助的。

当你catch到一个异常Throwable e后，大家最常用的做法就是

e.printStackTrace();

如果你使用了log4j，那么我建议使用

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
class Axxx {
	protected final Log logger = LogFactory.getLog(getClass());
	{
		Throwable e;
		// .......
		// .......
		logger.error(e);
	}
}

如果你要将错误堆栈的系想你存储到数据库中，可以参考下面的类

package com.mahh.jdk;

import java.io.IOException;
import java.io.LineNumberReader;
import java.io.PrintWriter;
import java.io.StringReader;
import java.io.StringWriter;
import java.util.ArrayList;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * @author mahh
 *
 * @since：2013-1-28 上午10:06:40
 *
 */
public class ThrowableInformation {
	protected final Log logger = LogFactory.getLog(getClass());
	/**=======================================================================
	 * 获得操作系统中，换行字符串。如Micorsoft Windows XP专业版中换行符"\r\n"
	 * =======================================================================
	 */
	// Note that the line.separator property can be looked up even by applets.
	// 参考org.apache.log4j.Layout
	public final static String LINE_SEP = System.getProperty("line.separator");
	// 参考java.io.BufferedWriter
	public final static String LINE_SEP2 = (String) java.security.AccessController
			.doPrivileged(new sun.security.action.GetPropertyAction(
					"line.separator"));

	/**
	 * @Description:将Throwable对象的错误堆栈内容形成字符串
 参考
	 *                                           {@link org.apache.log4j.spi.ThrowableInformation}
	 *                                           代码
	 * @param throwable
	 *            异常对象
	 * @return
	 * @author mahh
	 * @since：2014-9-30 下午02:32:51
	 */
	public static String[] getThrowableStrRep(Throwable throwable) {
		if (throwable == null) {
			return new String[0];
		}
		StringWriter sw = new StringWriter();
		PrintWriter pw = new PrintWriter(sw);
		throwable.printStackTrace(pw);
		pw.flush();
		LineNumberReader reader = new LineNumberReader(new StringReader(
				sw.toString()));
		ArrayList lines = new ArrayList();
		try {
			String line = reader.readLine();
			while (line != null) {
				lines.add(line);
				line = reader.readLine();
			}
		} catch (IOException ex) {
			lines.add(ex.toString());
		}
		String[] rep = new String[lines.size()];
		lines.toArray(rep);
		return rep;
	}

	// 测试代码
	public static void main(String[] args) {
		RuntimeException e1 = new RuntimeException("aaa");
		RuntimeException e2 = new RuntimeException("e2", e1);
		RuntimeException e3 = new RuntimeException(e2);
		String[] errorStrArray = getThrowableStrRep(e3);
		for (int i = 0; i < errorStrArray.length; i++) {
			System.out.println(errorStrArray[i]);
		}
	}

}

最后，提一下debugg调试的时候，会遇到的一个奇怪的现象，java.lang.Throwable实例在调试时显示