通过url来设置log4j的记录级别

直接看代码。

import org.apache.log4j.AppenderSkeleton;
import org.apache.log4j.Level;
import org.apache.log4j.LogManager;
import org.apache.log4j.Logger;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import javax.annotation.PostConstruct;
import javax.servlet.http.HttpServletRequest;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;
@Controller
@RequestMapping(value = "/log4j")
public class Log4jController {
 private Map<String, Logger> log4jLoggers = new HashMap<>();
 private Map<String, AppenderSkeleton> log4jAppenders = new HashMap<>();
 @PostConstruct
 public void init() {
 loadLog4j();
 }
 private void loadLog4j() {
 Enumeration<?> loggers = LogManager.getLoggerRepository().getCurrentLoggers();//获取所有logger
 while (loggers.hasMoreElements()) {
 Object elem = loggers.nextElement();
 if (elem instanceof org.apache.log4j.Logger) {
 org.apache.log4j.Logger log4j = (org.apache.log4j.Logger) elem;
 log4jLoggers.put(log4j.getName(), log4j);
 Enumeration<?> allAppenders = log4j.getAllAppenders();//获取logger相关的appender
 while (allAppenders.hasMoreElements()) {
 Object apd = allAppenders.nextElement();
 if (apd instanceof AppenderSkeleton) {
 AppenderSkeleton appender = (AppenderSkeleton) apd;
 log4jAppenders.put(appender.getName(), appender);
 }
 }
 }
 }
 }
 @RequestMapping(value = "/setLoggerLevel")
 @ResponseBody
 public String setLoggerLevel(HttpServletRequest request) {
 String logName = request.getParameter("name");
 String levelStr = request.getParameter("level");
 Level level = Level.toLevel(levelStr, null);
 org.apache.log4j.Logger log4j = log4jLoggers.get(logName);
 if (log4j == null) {
 return "没有相应的logger[" + logName + "]存在";
 }
 if (level == null) {
 return "没有相应的日志级别[" + levelStr + "]存在";
 }
 log4j.setLevel(level);
 return "将日志logger[" + logName + "]设置为" + level.toString() + "模式";
 }
 @RequestMapping(value = "/setAppenderLevel")
 @ResponseBody
 public String setAppenderLevel(HttpServletRequest request) {
 String appenderName = request.getParameter("name");
 String levelStr = request.getParameter("level");
 Level level = Level.toLevel(levelStr, null);
 Response response = new Response();
 AppenderSkeleton appender = log4jAppenders.get(appenderName);
 if (appender == null) {
 return "没有相应的appender[" + appenderName + "]存在";
 }
 if (level == null) {
 return "没有相应的日志级别[" + levelStr + "]存在";
 }
 appender.setThreshold(level);
 return "将日志appender[" + appenderName + "]设置为" + level.toString() + "模式";
 }
}

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