通过log4j保存异常信息

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log4j.properties:

### direct log messages to stdout ###log4j.appender.stdout=org.apache.log4j.ConsoleAppenderlog4j.appender.stdout.layout=org.apache.log4j.PatternLayoutlog4j.appender.stdout.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss,SSS} %5p %c:%L - %m%n### direct messages to file myfile.log ###log4j.appender.myfile=org.apache.log4j.DailyRollingFileAppenderlog4j.appender.myfile.File=logs/myfile.loglog4j.appender.myfile.DatePattern='.'yyyy-MM-ddlog4j.appender.myfile.layout=org.apache.log4j.PatternLayoutlog4j.appender.myfile.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss,SSS} %5p %c:%L - %m%nlog4j.rootLogger=debug, stdout,myfile### name:com.demo,level:info,Appender and layout inherit rootLogger ###log4j.logger.com.demo=info

测试代码:

import java.io.PrintWriter;import java.io.StringWriter;import org.apache.log4j.Logger;import org.junit.Test;public class LogInputTest {static Logger logger = Logger.getRootLogger();@Testpublic void testLog() {StringBuffer sb = null;StringWriter out=new StringWriter();try {sb.append("hello");} catch (NullPointerException e) {e.printStackTrace(new PrintWriter(out));logger.info(out.toString());}}}

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