LoggingWSServer.java
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package com.cnlive.shenhe.logging;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
import org.thymeleaf.util.StringUtils;
import javax.websocket.*;
import javax.websocket.server.ServerEndpoint;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Arrays;
import java.util.Date;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
/**
* WebSocket获取实时日志并输出到Web页面
*/
@Component
@ServerEndpoint(value = "/logging/websocket", configurator = MyEndpointConfigure.class)
public class LoggingWSServer {
private static Logger log = LoggerFactory.getLogger(LoggingWSServer.class);
@Value("${spring.application.name}")
private String applicationName;
@Value("${spring.application.home}")
private String applicationHome;
/**
* 连接集合
*/
private static Map<String, Session> sessionMap = new ConcurrentHashMap<String, Session>();
private static Map<String, Integer> lengthMap = new ConcurrentHashMap<String, Integer>();
/**
* 连接建立成功调用的方法
*/
@OnOpen
public void onOpen(Session session) {
//添加到集合中
sessionMap.put(session.getId(), session);
lengthMap.put(session.getId(), 1);//默认从第一行开始
//获取日志信息
new Thread(() -> {
log.info("LoggingWebSocketServer 任务开始");
boolean first = true;
while (sessionMap.get(session.getId()) != null) {
BufferedReader reader = null;
try {
//日志文件路径，获取最新的
// String filePath = System.getProperty("user.home") + "/log/" + new SimpleDateFormat("yyyyMMdd").format(new Date()) + "/"+applicationName+".log";
String filePath = applicationHome+ "/" + new SimpleDateFormat("yyyyMMdd").format(new Date()) + "/"+applicationName+".log";
//字符流
reader = new BufferedReader(new FileReader(filePath));
Object[] lines = reader.lines().toArray();
//只取从上次之后产生的日志
Object[] copyOfRange = Arrays.copyOfRange(lines, lengthMap.get(session.getId()), lines.length);
//对日志进行着色，更加美观 PS：注意，这里要根据日志生成规则来操作
for (int i = 0; i < copyOfRange.length; i++) {
String line = (String) copyOfRange[i];
//先转义
line = line.replaceAll("&", "&")
.replaceAll("<", "<")
.replaceAll(">", ">")
.replaceAll("\"", """);
//处理等级
line = line.replace("DEBUG", "<span style='color: blue;'>DEBUG</span>");
line = line.replace("INFO", "<span style='color: green;'>INFO</span>");
line = line.replace("WARN", "<span style='color: orange;'>WARN</span>");
line = line.replace("ERROR", "<span style='color: red;'>ERROR</span>");
//处理类名
String[] split = line.split("]");
if (split.length >= 2) {
String[] split1 = split[1].split("-");
if (split1.length >= 2) {
line = split[0] + "]" + "<span style='color: #298a8a;'>" + split1[0] + "</span>" + "-" + split1[1];
}
}
copyOfRange[i] = line;
}
//存储最新一行开始
lengthMap.put(session.getId(), lines.length);
//第一次如果太大，截取最新的200行就够了，避免传输的数据太大
if(first && copyOfRange.length > 200){
copyOfRange = Arrays.copyOfRange(copyOfRange, copyOfRange.length - 200, copyOfRange.length);
first = false;
}
String result = StringUtils.join(copyOfRange, "<br/>");
//发送
send(session, result);
//休眠一秒
Thread.sleep(1000);
} catch (Exception e) {
//捕获但不处理
e.printStackTrace();
} finally {
try {
reader.close();
} catch (IOException ignored) {
}
}
}
log.info("LoggingWebSocketServer 任务结束");
}).start();
}
/**
* 连接关闭调用的方法
*/
@OnClose
public void onClose(Session session) {
//从集合中删除
sessionMap.remove(session.getId());
lengthMap.remove(session.getId());
}
/**
* 发生错误时调用
*/
@OnError
public void onError(Session session, Throwable error) {
error.printStackTrace();
}
/**
* 服务器接收到客户端消息时调用的方法
*/
@OnMessage
public void onMessage(String message, Session session) {
}
/**
* 封装一个send方法，发送消息到前端
*/
private void send(Session session, String message) {
try {
session.getBasicRemote().sendText(message);
} catch (Exception e) {
e.printStackTrace();
}
}
}