我开发了一个spring应用程序，我想用apache log4j配置它，下载它并将jar放在项目的类路径中。下面是我的log4j.Properties文件。
# Root logger option
log4j.rootLogger=INFO, file
# Direct log messages to a log file
log4j.appender.file=org.apache.log4j.RollingFileAppender
log4j.appender.file.File=C\:\\loging.log
log4j.appender.file.MaxFileSize=1MB
log4j.appender.file.MaxBackupIndex=1
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n
以下是我的主要春季应用程序类。
import org.apache.log4j.Logger;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.core.io.FileSystemResource;
public class DrawingClass {
public static void main(String args[])
{
//without dependency injection
/*Triangle t1 = new Triangle();
t1.draw();*/
//with dependency injection
BeanFactory factory = new XmlBeanFactory(new FileSystemResource("Spring.xml"));
Triangle t1 =(Triangle) factory.getBean("triangle");
t1.draw();
}
}
请告知我是否要将log.info放在我上面的主类中我需要在主类中进行哪些修改，还请告知我在主类中调用log4j需要做些什么修改？
提出这个解决方案并且它有效..编辑后的log4j.properties文件是
### direct messages to file or.log ###
log4j.appender.file=org.apache.log4j.FileAppender
log4j.appender.file.File=C:/logs/s.log
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1} - %m%n
log4j.appender.file.append=true
### set log levels - for more verbose logging change 'info' to 'debug' ##
log4j.rootCategory=ALL, file
log4j.logger.Demo=\=debug
log4j.logger.org.eclipse=debug
从主类调用的方式是
import org.apache.log4j.Logger;
import org.apache.log4j.PropertyConfigurator;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.core.io.FileSystemResource;
public class DrawingClass {
/* Get actual class name to be printed on */
static final Logger log = Logger.getLogger(DrawingClass.class);
public static void main(String args[])
{PropertyConfigurator.configure("log4j.properties");
//without dependency injection
/*Triangle t1 = new Triangle();
t1.draw();*/
log.info("Before execution");
//with dependency injection
BeanFactory factory = new XmlBeanFactory(new FileSystemResource("Spring.xml"));
Triangle t1 =(Triangle) factory.getBean("triangle");
log.info("Hello this is an info message");
t1.draw();
log.info("after object execution");
}
}
如果还有其他更好的方法，请告知。
答案 0 :(得分：1)
为了在我的项目中使用日志记录，我做了以下事情：
1）定义的特殊注释应标记应注入记录器的字段：
@Retention(RUNTIME)
@Target(FIELD)
@Documented
public @interface InjectLogger {
}
2）然后创建了特殊的BeanPostProcessor，用于将注入的记录器注入注释字段：
@Component(value="loggerInjector")
public class LoggerInjector implements BeanPostProcessor {
@Override
public Object postProcessAfterInitialization(Object bean, String beanName)
throws BeansException {
return bean;
}
@Override
public Object postProcessBeforeInitialization(final Object bean, String beanName)
throws BeansException {
ReflectionUtils.doWithFields(bean.getClass(), new FieldCallback() {
public void doWith(Field field) throws IllegalArgumentException,
IllegalAccessException {
// make the field accessible if defined private
ReflectionUtils.makeAccessible(field);
if (field.getAnnotation(InjectLogger.class) != null) {
Logger log = LoggerFactory.getLogger(bean.getClass());
field.set(bean, log);
}
}
});
return bean;
}
}
3）在必要的bean标记属性之后，应该通过@InjectLogger注释注入logger并在代码中使用此记录器。
@InjectLogger
private Logger logger;
public void doSomething(...) {
try{
...
} catch (Exception e) {
logger.error("bla bla bla", e);
}
}
在我的项目中，我使用slf4j和log4j作为具体实现。但是对于log4j，它将是类似的。
此外，您需要知道默认情况下所有使用common-logging的Spring库。如果你想让Spring libs将他们的日志写入你的文件，你应该使用特殊的addla lib。我记得你可以从appache网站获取它们。对于slf4j，这样的lib被命名为jcl-over-slf4j-1.6.4.jar。
编辑2：
同样在春天，良好的做法是使用AOP进行记录。以下是简化方面的示例：
@Component
@Aspect
@Order(value=2)
public class LoggingAspect {
@Around("execution(* com.blablabla.server..*.*(..))")
public Object logMethod(ProceedingJoinPoint joinPoint) throws Throwable{
final Logger logger = LoggerFactory.getLogger(joinPoint.getTarget().getClass().getName());
Object retVal = null;
try {
StringBuffer startMessageStringBuffer = new StringBuffer();
startMessageStringBuffer.append("Start method ");
startMessageStringBuffer.append(joinPoint.getSignature().getName());
startMessageStringBuffer.append("(");
Object[] args = joinPoint.getArgs();
for (int i = 0; i < args.length; i++) {
startMessageStringBuffer.append(args[i]).append(",");
}
if (args.length > 0) {
startMessageStringBuffer.deleteCharAt(startMessageStringBuffer.length() - 1);
}
startMessageStringBuffer.append(")");
logger.trace(startMessageStringBuffer.toString());
StopWatch stopWatch = new StopWatch();
stopWatch.start();
retVal = joinPoint.proceed();
stopWatch.stop();
StringBuffer endMessageStringBuffer = new StringBuffer();
endMessageStringBuffer.append("Finish method ");
endMessageStringBuffer.append(joinPoint.getSignature().getName());
endMessageStringBuffer.append("(..); execution time: ");
endMessageStringBuffer.append(stopWatch.getTotalTimeMillis());
endMessageStringBuffer.append(" ms;");
logger.trace(endMessageStringBuffer.toString());
} catch (Throwable ex) {
StringBuffer errorMessageStringBuffer = new StringBuffer();
// Create error message
logger.error(errorMessageStringBuffer.toString(), e)
throw ex;
}
return retVal;
}
}
答案 1 :(得分：1)
您可以尝试将此行添加到您的班级 -
public class DrawingClass {
static final Logger log = Logger.getLogger(DrawingClass.class);
public static void main(String args[])
{
//without dependency injection
/*Triangle t1 = new Triangle();
t1.draw();*/
log.info("Before execution");
//with dependency injection
BeanFactory factory = new XmlBeanFactory(new FileSystemResource("Spring.xml"));
Triangle t1 =(Triangle) factory.getBean("triangle");
t1.draw();
}
}
现在让我知道是否有任何内容被添加到日志中。
此链接可能会对您有所帮助 - http://www.dzone.com/tutorials/java/log4j/sample-log4j-properties-file-configuration-1.html
答案 2 :(得分：0)
# LOG4J configuration
log4j.rootLogger= DEBUG, INFO, Appender1, Appender2
log4j.appender.Appender1=org.apache.log4j.ConsoleAppender
log4j.appender.Appender1.layout=org.apache.log4j.PatternLayout
log4j.appender.Appender1.layout.ConversionPattern=%-7p %d [%t] %c %x - %m%n
log4j.appender.Appender2=org.apache.log4j.FileAppender
log4j.appender.Appender2.File=D:/Project Log/Demo/demo.log
log4j.appender.Appender2.layout=org.apache.log4j.PatternLayout
log4j.appender.Appender2.layout.ConversionPattern=%-7p %d [%t] %c %x - %m%n
将此代码写入log4j.properties，该文件位于src文件夹的Resources文件夹中。
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
<context:property-placeholder location="classpath:log4j.properties" />
在spring-config.xml
之间和之后写下以上代码
package com.apmc.controller;
import org.apache.log4j.Logger;
import java.text.DateFormat;
import java.util.Date;
import com.apmc.Generic.RandomGenerator;//This my own made class So You need to create //RandomGenerator for use it
@Controller
public class StateController {
private static Logger logger = Logger.getLogger(StateController.class);
DateFormat df = new SimpleDateFormat("ddMMyyHHmmss");
Date dateobj = new Date();
int randNum = RandomGenerator.randInt(1000, 9999);
String successMsg = "", errorMsg = "";
@Autowired
StateService stateService;
List<State> newList = new ArrayList();
@RequestMapping(value = "/Admin/admin/NewState_form")
public ModelAndView stateForm(@ModelAttribute State state) {
try {
logger.info("\n stateForm Started \n errorcode : "+errorcode);
newList = stateService.loadAll();
logger.info("\n stateForm Completed");
errorMsg = "";
} catch (Exception e) {
errorcode = ""+df.format(dateobj)+randNum;
errorMsg = " New State Form Error \n Please contact Admin and errorcode:" +errorcode;
successMsg = "";
logger.error("error code for stateForm in StateController" +df.format(dateobj)+" errorcode: "+errorcode);
}
return new ModelAndView("state").addObject("editState", new State())
.addObject("errorMsg", errorMsg) .addObject("showStateList",newList)
.addObject("successMsg", successMsg);
}
}
上面有关如何使用登录Controller或任何Java类的示例 在这里，我为错误跟踪创建了错误代码show for commmunicate with ErrorGenerator.java write as under given
package com.apmc.Generic;
import java.util.Random;
public class RandomGenerator {
/**
* Returns a pseudo-random number between min and max, inclusive.
* The difference between min and max can be at most
* <code>Integer.MAX_VALUE - 1</code>.
*
* @param min Minimum value
* @param max Maximum value. Must be greater than min.
* @return Integer between min and max, inclusive.
* @see java.util.Random#nextInt(int)
*/
public static int randInt(int min, int max) {
// NOTE: Usually this should be a field rather than a method
// variable so that it is not re-seeded every call.
Random rand = new Random();
// nextInt is normally exclusive of the top value,
// so add 1 to make it inclusive
int randomNum = rand.nextInt((max - min) + 1) + min;
return randomNum;
}
}