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<br> 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