<!-- 在pom.xml中添加 -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-actuator</artifactId>
</dependency>

# 在application.yml中添加
management:
  endpoints:
    web:
      exposure:
        include: "metrics,threaddump"

# 查看線程總數(shù)
http://127.0.0.1:8080/actuator/metrics/jvm.threads.live

spring:
  security:
    user:
      name: admin
      password: securepassword

management:
  server:
    port: 9090  # 監(jiān)控端口與業(yè)務(wù)端口分離

# 查看所有Java進(jìn)程
jps -l

# 或者使用ps命令
ps aux | grep java

36756 org.springframework.boot.loader.JarLauncher

jstack 36756

"Reference Handler" - 引用處理線程
"Finalizer" - 對象終結(jié)線程
"Signal Dispatcher" - 信號分發(fā)線程
"GC Thread" - 垃圾回收線程（多個）

"http-nio-8080-exec-*" - Tomcat工作線程
"Catalina-utility-*" - Tomcat工具線程
"HikariPool-*" - 數(shù)據(jù)庫連接池線程

"lettuce-*" - Redis客戶端線程
"boundedElastic-*" - Reactor響應(yīng)式線程
"mysql-cj-*" - MySQL驅(qū)動線程

jstack 36756 > thread.txt

# 統(tǒng)計(jì)總線程數(shù)
grep 'java.lang.Thread.State' thread.txt | wc -l

# 統(tǒng)計(jì)Tomcat線程數(shù)  
grep '"http-nio' thread.txt | wc -l

# 查看線程狀態(tài)分布
grep 'java.lang.Thread.State' thread.txt | sort | uniq -c

#!/bin/bash
# monitor_threads.sh

APP_NAME="your-spring-boot-app"
LOG_DIR="./thread_dumps"
INTERVAL=60  # 監(jiān)控間隔(秒)
MAX_DUMPS=10 # 最大轉(zhuǎn)儲文件數(shù)

mkdir -p $LOG_DIR

while true; do
    PID=$(jps -l | grep $APP_NAME | awk '{print $1}')
    
    if [ -z "$PID" ]; then
        echo "$(date): 應(yīng)用未運(yùn)行"
        sleep $INTERVAL
        continue
    fi
    
    # 生成時間戳
    TIMESTAMP=$(date +%Y%m%d_%H%M%S)
    
    # 生成線程轉(zhuǎn)儲
    jstack $PID > $LOG_DIR/thread_dump_$TIMESTAMP.txt
    
    # 統(tǒng)計(jì)線程信息
    TOTAL_THREADS=$(grep 'java.lang.Thread.State' $LOG_DIR/thread_dump_$TIMESTAMP.txt | wc -l)
    RUNNABLE=$(grep 'java.lang.Thread.State: RUNNABLE' $LOG_DIR/thread_dump_$TIMESTAMP.txt | wc -l)
    WAITING=$(grep 'java.lang.Thread.State: WAITING' $LOG_DIR/thread_dump_$TIMESTAMP.txt | wc -l)
    BLOCKED=$(grep 'java.lang.Thread.State: BLOCKED' $LOG_DIR/thread_dump_$TIMESTAMP.txt | wc -l)
    
    echo "$(date): 線程統(tǒng)計(jì) - 總數(shù): $TOTAL_THREADS, 運(yùn)行: $RUNNABLE, 等待: $WAITING, 阻塞: $BLOCKED"
    
    # 清理舊文件
    ls -t $LOG_DIR/thread_dump_*.txt | tail -n +$MAX_DUMPS | xargs rm -f
    
    sleep $INTERVAL
done

# Windows
visualvm.exe

# Linux/macOS
./visualvm

java -Dcom.sun.management.jmxremote \
     -Dcom.sun.management.jmxremote.port=9090 \
     -Dcom.sun.management.jmxremote.ssl=false \
     -Dcom.sun.management.jmxremote.authenticate=false \
     -Dcom.sun.management.jmxremote.local.only=false \
     -Djava.rmi.server.hostname=你的服務(wù)器IP \
     -jar your-app.jar

# 1. 生成線程快照
jstack 36756 > slow.txt

# 2. 查看有沒有BLOCKED線程
grep "BLOCKED" slow.txt

# 3. 查看Tomcat線程在干什么
grep -A 5 "http-nio" slow.txt

# 查看線程總數(shù)是否異常
grep 'java.lang.Thread.State' thread.txt | wc -l

# 強(qiáng)制生成線程快照
jstack -F 36756 > stuck.txt

# 查找死鎖
grep -i "deadlock" stuck.txt