spring mvc: log4j插件 log日志的输出

准备：

log插件：log4j

<!-- log日志插件 -->
	<!-- https://mvnrepository.com/artifact/log4j/log4j -->
	<dependency>
	    <groupId>log4j</groupId>
	    <artifactId>log4j</artifactId>
	    <version>1.2.17</version>
	</dependency>

　　

访问地址：http://localhost:8080/gugua3/hello/log

包：json

需要在/WEB-INF/classes/文件夹下，新建log4j的配置

log4j.properties

# Root logger option
log4j.rootLogger=DEBUG, stdout, file

# Redirect log messages to console
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n

# Redirect log messages to a log file
log4j.appender.file=org.apache.log4j.RollingFileAppender

#outputs to Tomcat home
log4j.appender.file.File=${catalina.home}/logs/myapp.log
log4j.appender.file.MaxFileSize=5MB
log4j.appender.file.MaxBackupIndex=10
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n

　　

那么生成的日志文件 位置为: apache-tomcat-7.0.82logs目录下(以你的tomcat目录为主)

配置文件如下:

<web-app>
  <display-name>Archetype Created Web Application</display-name>
  
<!--配置文件路径-->
<context-param>
 	<param-name>contextConfigLocation</param-name>
	<param-value>/WEB-INF/applicationContext.xml</param-value>
</context-param>

<!-- 字符过滤器 -->  
<filter>
   <filter-name>encodingFilter</filter-name>
   <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
   <init-param>
       <param-name>encoding</param-name>
       <param-value>UTF-8</param-value>
   </init-param>  
</filter>  
<filter-mapping>  
    <filter-name>encodingFilter</filter-name>  
    <url-pattern>/*</url-pattern>  
</filter-mapping> 


<!-- 监听转发 -->
<listener>
	<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<servlet>  
    <servlet-name>json</servlet-name>  
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>  
    <load-on-startup>1</load-on-startup>  
</servlet>  
<servlet-mapping>  
    <servlet-name>json</servlet-name>  
    <url-pattern>/</url-pattern>  
</servlet-mapping>      
  
</web-app>

　　

applicationContext.xml自动导入bean

<beans
xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans 
					http://www.springframework.org/schema/beans/spring-beans.xsd 
					http://www.springframework.org/schema/mvc 
					http://www.springframework.org/schema/mvc/spring-mvc.xsd 
					http://www.springframework.org/schema/context 
					http://www.springframework.org/schema/context/spring-context.xsd">


<!-- 默认：注解映射支持 -->		
<mvc:annotation-driven/>
<!-- 静态资源配置 -->
<mvc:resources location="/pages/**" mapping="/pages/"/>

<!-- 自动扫描包名,controller -->
<context:component-scan base-package="json"/>		


</beans>

　　

json-servlet.xml

<beans
xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans 
					http://www.springframework.org/schema/beans/spring-beans.xsd 
					http://www.springframework.org/schema/mvc 
					http://www.springframework.org/schema/mvc/spring-mvc.xsd 
					http://www.springframework.org/schema/context 
					http://www.springframework.org/schema/context/spring-context.xsd">
			
<!-- bean视图解析 -->			
<!-- 
<bean class="org.springframework.web.servlet.view.BeanNameViewResolver"/>		
<bean id="rssViewer" class="json.RSSFeedViewer"/>	
-->

<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
      <property name="prefix" value="/WEB-INF/jsp/" />
      <property name="suffix" value=".jsp" />
   </bean>		
					
</beans>	

　　

HelloController.java

package json;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.ui.ModelMap;
import org.apache.log4j.Logger;


@Controller
public class HelloController {
	
	private static final Logger LOGGER = Logger.getLogger(HelloController.class);

	@RequestMapping(value="/hello/log", method=RequestMethod.GET)
	public String log(ModelMap model)
	{
		LOGGER.info("printHello started");
		
		if(LOGGER.isDebugEnabled())
		{
			LOGGER.debug("Inside: printHello");
		}
		
		//logs exception
		LOGGER.error("Logging a sample exception", new Exception("Testing"));		
	    //LOGGER.error("Logging a sample exception", new Exception("Testing"));
		
		model.addAttribute("message", "hello Spring mvc Framework");
		LOGGER.info("pringHello ended");
		
		return "hello_log";
	}
}