spring代码异常捕获到logback logging.config=logback

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：

1main:
2catch(Exception e){
3log.error("xxx",e);
4}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。
5
6package com.italktv.platform.audioDist;
7
8import java.io.IOException;
9import java.io.OutputStream;
10import java.io.PrintStream;
11
12import org.apache.log4j.Level;
13import org.apache.log4j.Logger;
14
15public class Log4jStdOutErrProxy {
16
17    public static void bind() {
18        bind(Logger.getLogger("STDOUT"), Logger.getLogger("STDERR"));
19    }
20
21    @SuppressWarnings("resource")
22    public static void bind(Logger loggerOut, Logger loggerErr) {
23//            System.setOut(new PrintStream(new LoggerStream(loggerOut, Level.INFO,  System.out), true));
24        System.setErr(new PrintStream(new LoggerStream(loggerErr, Level.ERROR, System.err), true));
25    }
26
27    private static class LoggerStream extends OutputStream {
28        private final Logger logger;
29        private final Level logLevel;
30        private final OutputStream outputStream;
31        private StringBuilder sbBuffer;
32
33        public LoggerStream(Logger logger, Level logLevel, OutputStream outputStream) {
34            this.logger = logger;
35            this.logLevel = logLevel;
36            this.outputStream = outputStream;
37            sbBuffer = new StringBuilder();
38        }
39
40        @Override
41        public void write(byte[] b) throws IOException {
42            doWrite(new String(b));
43        }
44
45        @Override
46        public void write(byte[] b, int off, int len) throws IOException {
47            doWrite(new String(b, off, len));
48        }
49
50        @Override
51        public void write(int b) throws IOException {
52            doWrite(String.valueOf((char) b));
53        }
54
55        private void doWrite(String str) throws IOException {
56            sbBuffer.append(str);
57            if (sbBuffer.charAt(sbBuffer.length() - 1) == '\n') {
58                // The output is ready
59                sbBuffer.setLength(sbBuffer.length() - 1); // remove '\n'
60                if (sbBuffer.charAt(sbBuffer.length() - 1) == '\r') {
61                    sbBuffer.setLength(sbBuffer.length() - 1); // remove '\r'
62                }
63                String buf = sbBuffer.toString();
64                sbBuffer.setLength(0);
65                outputStream.write(buf.getBytes());
66                outputStream.write('\n');
67                logger.log(logLevel, buf);
68            }
69        }
70    } // inner class LoggerStream  
71
72}

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();