重构获取异常栈信息--printStackTrace

/** 
 * 
 * @author wumingkun
 * @version 1.0.0
 * @Description
 */

package com.demo.stacktrace;

import java.io.PrintStream;

/**
 * @author wumingkun
 * 
 */
public class MyStackTrace {
	public static String getStackTrace(Throwable errors) {
		StringBuffer result = new StringBuffer();
		result.append(errors);
		StackTraceElement[] trace = errors.getStackTrace();
		for (int i = 0; i < trace.length; i++)
			result.append("\n\tat " + trace[i]);
		 Throwable ourCause = errors.getCause();
         if (ourCause != null)
             result.append(getStackTraceAsCause(ourCause, trace));
		return result.toString();
	}

	private static String  getStackTraceAsCause(
			Throwable ourCause,StackTraceElement[] causedTrace) {
		StringBuffer result=new StringBuffer();
		StackTraceElement[] trace = ourCause.getStackTrace();
		int m = trace.length - 1, n = causedTrace.length - 1;
		while (m >= 0 && n >= 0 && trace[m].equals(causedTrace
)) {
			m--;
			n--;
		}
		int framesInCommon = trace.length - 1 - m;
		result.append("\nCaused by: " + ourCause);
		for (int i = 0; i <= m; i++)
			result.append("\n\tat " + trace[i]);
		if (framesInCommon != 0)
			result.append("\n\t... " + framesInCommon + " more");

		Throwable tempCause = ourCause.getCause();
		if (tempCause != null)
			result.append(getStackTraceAsCause(tempCause, trace));
		return result.toString();
	}

}

/**
 * 
 * @author wumingkun
 * @version 1.0.0
 * @Description
 */

package com.demo.stacktrace;

/**
 * @author wumingkun
 *
 */
public class StackTraceTest {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		try {
			m1();
		} catch (Exception e) {
			System.out.println(MyStackTrace.getStackTrace(e));//直接返回异常栈信息字符串
		}
	}

	/**
	 * 
	 */
	private static void m1() {
		StringBuffer sb=null;
		try {
			sb.append("aa");
		} catch (Exception e) {
			throw new RuntimeException(e);
		}
	}

}