log4j的使用以及普通配置文件的读取

一、添加log4j的依赖

<dependency>
    <groupId>log4j</groupId>
    <artifactId>log4j</artifactId>
    <version>1.2.17</version>
</dependency>

二、读取配置文件

PropertyConfigurator.configure("conf/log4j.properties");

说明：log4j的配置文件放在项目根目录下的conf文件夹下。打成jar包的时候，是不会包含到jar包里面的。放到linux系统上的话，要在jar包的同级目录下，新建conf文件夹，再将log4j.properties配置文件上传。其他的配置文件同理。

三、使用Logger打印日志

private static Logger logger = Logger.getLogger(YourClass.class);

logger.info("需要打印的日志信息");

四、log4j配置文件（仅供参考）

#log4j.rootLogger=INFO, CONSOLE,LOCALFILE
log4j.rootLogger=INFO,CONSOLE,LOCALFILE
#log4j.logger.CONSOLE.testlog4j.App = DEBUG,test3

# A1 is set to be a ConsoleAppender which outputs to System.out. 
log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender

# A1 uses PatternLayout.
log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout

# The conversion pattern uses format specifiers. You might want to
# change the pattern an watch the output format change.
log4j.appender.CONSOLE.layout.ConversionPattern=%d{HH:mm:ss,SSS} %-5p [%t] %1c %3x - %m%n

# A1 is set to be a ConsoleAppender which outputs to System.out. 
log4j.appender.LOCALFILE=org.apache.log4j.DailyRollingFileAppender

# A1 uses PatternLayout.
log4j.appender.LOCALFILE.layout=org.apache.log4j.PatternLayout

# The conversion pattern uses format specifiers. You might want to
# change the pattern an watch the output format change.
log4j.appender.LOCALFILE.layout.ConversionPattern=%d{HH:mm:ss,SSS} %-5p [%t] %1c %3x - %m%n

log4j.appender.LOCALFILE.File=target/audit

log4j.appender.LOCALFILE.DatePattern='.'yyyy-MM-dd'.log' 
 

 五、普通配置文件的读取(config.properties)

public static String getConfigValue(String key) {
		Properties property = new Properties();
		InputStream inputStream = null;
		InputStreamReader reader = null;
		try {
			inputStream = new FileInputStream("./conf/config.properties");
			reader = new InputStreamReader(inputStream, "utf-8");
		} catch (Exception e) {
			inputStream = PropertiesUtilLocal.class.getClassLoader().getResourceAsStream("config.properties");
			if (inputStream != null) {
				try {
					reader = new InputStreamReader(inputStream, "utf-8");
				} catch (UnsupportedEncodingException e1) {
					logger.error("new InputStreamReader(inputStream,'utf-8') fail" + e.getLocalizedMessage());
				}
			}
			if (inputStream == null) {
				return null;
			}
		}
		try {
			property.load(reader);
			return property.getProperty(key);
		} catch (IOException e) {
			logger.error(e.getLocalizedMessage());
			return null;
		} finally {
			try {
				inputStream.close();
			} catch (IOException e1) {
				logger.error(e1.getLocalizedMessage());
			}
		}
	}

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