spring代码异常捕获到logback logging.config=logback-spring.xml文件中不能输出异常e.printStackTrace

在spring中使用logging.config=logback-spring.xml将日志转存到了文件中。但是代码中的捕获的异常无法用 e.printStackTrace 打印到文件中。使用如下方法打印：

main:
catch(Exception e){
log.error("xxx",e);
}

这里可以重新定向 system.out 和err的输出，到logback： https://stackoverflow.com/questions/1200175/log4j-redirect-stdout-to-dailyrollingfileappender 
用于捕获运行时异常。

package com.italktv.platform.audioDist;

import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintStream;

import org.apache.log4j.Level;
import org.apache.log4j.Logger;

public class Log4jStdOutErrProxy {

public static void bind() {
bind(Logger.getLogger("STDOUT"), Logger.getLogger("STDERR"));
}

@SuppressWarnings("resource")
public static void bind(Logger loggerOut, Logger loggerErr) {
//            System.setOut(new PrintStream(new LoggerStream(loggerOut, Level.INFO,  System.out), true));
System.setErr(new PrintStream(new LoggerStream(loggerErr, Level.ERROR, System.err), true));
}

private static class LoggerStream extends OutputStream {
private final Logger logger;
private final Level logLevel;
private final OutputStream outputStream;
private StringBuilder sbBuffer;

public LoggerStream(Logger logger, Level logLevel, OutputStream outputStream) {
this.logger = logger;
this.logLevel = logLevel;
this.outputStream = outputStream;
sbBuffer = new StringBuilder();
}

@Override
public void write(byte[] b) throws IOException {
doWrite(new String(b));
}

@Override
public void write(byte[] b, int off, int len) throws IOException {
doWrite(new String(b, off, len));
}

@Override
public void write(int b) throws IOException {
doWrite(String.valueOf((char) b));
}

private void doWrite(String str) throws IOException {
sbBuffer.append(str);
if (sbBuffer.charAt(sbBuffer.length() - 1) == '\n') {
// The output is ready
sbBuffer.setLength(sbBuffer.length() - 1); // remove '\n'
if (sbBuffer.charAt(sbBuffer.length() - 1) == '\r') {
sbBuffer.setLength(sbBuffer.length() - 1); // remove '\r'
}
String buf = sbBuffer.toString();
sbBuffer.setLength(0);
outputStream.write(buf.getBytes());
outputStream.write('\n');
logger.log(logLevel, buf);
}
}
} // inner class LoggerStream

}

初始化时调用:

// initialize logging to go to rolling log file
LogManager.resetConfiguration();

// and output on the original stdout
System.out.println("Hello on old stdout");
Log4jStdOutErrProxy.bind();