Log4j转OutputStream

有时候，一些框架提供了日志输出，但是需要我们制定输出流，才会帮我们打印，下面讲解一下如何获取log4j的输出流

spring boot下

1. 新建以下类

   import java.io.OutputStream;import org.slf4j.Logger;public class LogOutputStream extends OutputStream {private final Logger logger;/** The internal memory for the written bytes. */private StringBuffer mem;public LogOutputStream( final Logger logger ) {this.logger = logger;mem = new StringBuffer();}@Overridepublic void write( final int b ) {if ( (char) b == '\n' ) {flush();return;}mem = mem.append( (char) b );}@Overridepublic void flush() {logger.info( mem.toString() );mem = new StringBuffer();}
   }

2. 获取输出流

   private org.slf4j.Logger log = org.slf4j.LoggerFactory.getLogger(Test.class) 
   // log可以新建也可以使用注解
   new LogOutputStream(log);