JAVA用戶端程式在Spring中配置Log4j的簡單說明

我想你的java用戶端首先有個main函數，像這樣

public static Log logger=LogFactory.getLog(Program.class); 
public static void main(String[] args) {
	ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
	logger.info("load log4j ok!");
}
           

執行會出現如下異常，并且沒有列印日志

log4j:WARN No appenders could be found for logger (org.springframework.context.support.ClassPathXmlApplicationContext).

log4j:WARN Please initialize the log4j system properly.

解決方法：

方法1（推薦）：修改main函數，在載入Spring上下文之前，載入log4j

public static Log logger=LogFactory.getLog(Program.class); 
public static void main(String[] args) {
	DOMConfigurator.configure(Program.class.getResource("/log4j.xml"));//從class路徑加載
	ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
	logger.info("load log4j ok!");
}
           

同時可以列印Spring的日志和自己的日志。

方法2：在Spring配置檔案中配置Bean

<bean id="log4jInitialization"  
		class="org.springframework.beans.factory.config.MethodInvokingFactoryBean">  
       <property name="targetClass"  
          value="org.springframework.util.Log4jConfigurer" />  
       <property name="targetMethod" value="initLogging" />  
       <property name="arguments">  
          <list>  
             <value>classpath:log4j.xml</value>  
          </list>  
       </property>  
    </bean>  
           

可以列印log4j的日志，但因為首次加載時沒有找到log4j的路徑，是以之前也會出現警告：

log4j:WARN No appenders could be found for logger (org.springframework.context.support.ClassPathXmlApplicationContext).

log4j:WARN Please initialize the log4j system properly.

2013-04-26 11:05:52,593 INFO  [main] ui.Program (Program.java:18) - load log4j ok!