动态修改log4j的日志级别，不重启服务器_log4j level.tolevel-优快云博客

本文链接：https://blog.youkuaiyun.com/tlk20071/article/details/75315915

本文介绍了一种在不重启服务器的情况下动态修改Log4j日志级别的方法，并提供了具体的实现代码。此外，还讨论了如何查看当前的日志级别。

通过条用log4j的api，动态修改log4j的日志级别，不用重启服务器，代码如下：

import java.io.Writer;

import java.util.Enumeration;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.apache.log4j.Level;

import org.apache.log4j.LogManager;

import org.apache.log4j.Logger;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestMethod;

import org.springframework.web.bind.annotation.ResponseBody;

/**

* 动态修改log4j日志级别

*

* @author tanlk

* @date 2017年7月18日下午5:43:27

*/

@Controller

public class LoggerController {

/**

*

* @param p 需要修改的包名

* @param l 日志级别

* @return

*/

@ResponseBody

@RequestMapping(value = "/logger/change", method = RequestMethod.GET, produces = "application/json")

public String change(String p, String l) {

try {

Level level = Level.toLevel(l);

Logger logger = LogManager.getLogger(p);

logger.setLevel(level);

} catch (Exception e) {

return "失败";

}

return "成功";

}

/**

* 修改全局日志级别，但是我测试的时候只修改了第三方jar的日志级别，我的项目包的日志级别没有修改成功

* @param l

* @return

*/

@ResponseBody

@RequestMapping(value = "/logger/changeRoot", method = RequestMethod.GET, produces = "application/json")

public String change(String l) {

try {

Level level = Level.toLevel(l);

LogManager.getRootLogger().setLevel(level);

} catch (Exception e) {

return "失败";

}

return "成功";

}

/**

* 查看现在包的日志级别

* @return

*/

@RequestMapping(value = "/loggers", method = RequestMethod.GET)

public void index(HttpServletRequest request, HttpServletResponse response) {

StringBuilder sb = new StringBuilder();

try {

sb.append("<html>");

Writer writer = response.getWriter();

response.setCharacterEncoding("UTF-8");

response.setContentType("text/html; charset=utf-8");

Enumeration logs = LogManager.getCurrentLoggers();

while (logs.hasMoreElements()) {

Logger logger = (Logger) logs.nextElement();

sb.append("<span style='display:block;'>");

sb.append(logger.getName()).append(",").append(logger.getEffectiveLevel());

sb.append("</span>");

}

sb.append("</html>");

writer.write(sb.toString());

writer.flush();

if(writer != null){

writer.close();

}

System.out.println(sb.toString());

} catch (Exception e) {

}

另外：动态修改log4j的日志，还可以用spring提供的log4jConfigLocation