以一种奇怪的要求抓住了。我需要将唯一的错误ID附加到log4j消息并将该消息ID返回给interface.So,我可以创建一个spring服务,就像这样
public class LoggingService {
protected static Logger logger = LoggerFactory.getLogger(LoggingService.class);
public String debug(String debug_msg)
{
String uniqueMsgId = generateUniqueId();
logger.debug(concatIdWithMsg(uniqueMsgId, debug_msg));
return uniqueMsgId;
}
}
并将其自动发送到我需要的任何地方。
public class LoginLogoutController {
@Autowired
LoggingService logger;
@RequestMapping(value = "/login", method = RequestMethod.GET)
public String getLoginPage()
{
logger.debug("Login page requested");
}
}
虽然它运行正常但是logger msg中的源类是LoggingService,这很明显。我想要的是传递LoggingService自动装配的类,以便记录器消息显示问题的原始来源。我试着以某种方式改变服务 但不知道如何传递源类
public class LoggingService<T> {
protected static Logger logger = null;
Class<T> sourceClass;
public void construct(Class<T> sourceClass)
{
this.sourceClass = sourceClass;
logger = LoggerFactory.getLogger(sourceClass);
}
public String debug(String debug_msg)
{
String uniqueMsgId = generateUniqueId();
logger.debug(concatIdWithMsg(uniqueMsgId, debug_msg));
return null;
}
}
答案 0 :(得分:3)
我使用这种机制注入记录器。
创建此注释..
/**
* Indicates InjectLogger of appropriate type to
* be supplied at runtime to the annotated field.
*
* The injected logger is an appropriate implementation
* of org.slf4j.Logger.
*/
import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
import java.lang.annotation.Documented;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;
@Retention(RUNTIME)
@Target(FIELD)
@Documented
public @interface InjectLogger {
}
现在让我们定义一个实际完成注入记录器实现工作的类。
/**
* Auto injects the underlying implementation of logger into the bean with field
* having annotation <code>InjectLogger</code>.
*
*/
import java.lang.reflect.Field;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanPostProcessor;
import org.springframework.util.ReflectionUtils;
import static org.springframework.util.ReflectionUtils.FieldCallback;
public class LoggerInjector implements BeanPostProcessor {
public Object postProcessAfterInitialization(Object bean, String beanName)
throws BeansException {
return bean;
}
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;
}
}
使用它甚至更简单。只需将上面创建的Logger注释添加到所需类的Log字段中。
import org.slf4j.Logger;
public class Demo {
@InjectLogger
private Logger log;
public void doSomething() {
log.info("message");
log.error("Lets see how the error message looks...");
}
}
答案 1 :(得分:1)
为什么不使用Spring AOP。 AOP为您提供了很多可访问性和功能,当您的应用程序变得繁重时,您也可以在以后利用其有趣的功能。 Spring AOP