Idea常用插件

• Build Generator：生成builder模式的代码
• MybatisX：mapper.xml文件和dao之间关联、映射
• Lombok
• Maven Helper：分析maven冲突等
• Json parser

Java后台常用框架

• springboot
• springmvc
• mybatis -plus
• mysql
• maven
• junit
• jackson
• guava
• apache commons utils
• netty
• swagger
• joda-time

切面示例

定义注解

@Target({ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface DistributedLockAnnotation {String lockUniqueKey();int lockTime();TimeUnit lockTimeUnit();
}

定义切面

import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;import java.lang.reflect.Method;// 切面定义
@Aspect
@Component
public class DistributedLockAspect {@Autowiredprivate DistributedLock distributedLock;// 切入点@Pointcut("@annotation(xx.xx.DistributedLockAnnotation)")public void logPointCut() {}// 环绕通知@Around("logPointCut()")public Object around(ProceedingJoinPoint point) throws Throwable {Object result;try {boolean locked = tryGetDistributeLock(point);if (!locked) {throw new RunTimeException("xx");}result = point.proceed();} catch (Throwable e) {throw e;}return result;}private boolean tryGetDistributeLock(ProceedingJoinPoint point) {try {MethodSignature signature = (MethodSignature) point.getSignature();Method method = signature.getMethod();DistributedLock annotation = method.getAnnotation(DistributedLockAnnotation.class);String lockKey = SPELUtils.evalSPEl(point.getArgs(), method, annotation.uniqueKey());if (StringUtils.isBlank(lockKey)) {log.warn("xx, lockKey = " + lockKey);return false;}boolean locked = distributedLock.tryLock(lockKey, annotation.unit(), annotation.leaseTime());if (!locked) {log.warn("xx,, lockKey = " + lockKey + ", locked = " + locked);}return locked;} catch (Exception e) {log.error("", e);}return true;}
}

常见java启动、停止、监控脚本

启动脚本

start.sh:

#!/bin/bash
echo  "current path is ： $(pwd)"
source  /etc/profile# stop
sh /xx/xx/stop.sh# 设置JAVA_HOME和CLASSPATH
export JAVA_HOME=/xx/xx/java
export BASE_DIR=/xx/xx/x# 设置服务名称
SERVICE_NAME=your_service_namexxJAVA_OPTS="${JAVA_OPTS} -server -Xms4g -Xmx4g -Xmn2048m"
JAVA_OPTS="${JAVA_OPTS} -XX:+UseG1GC -XX:G1HeapRegionSize=32m -XX:G1ReservePercent=25 -XX:InitiatingHeapOccupancyPercent=30 -XX:SoftRefLRUPolicyMSPerMB=0"
JAVA_OPTS="${JAVA_OPTS} -verbose:gc -Xloggc:${BASE_PATH}/gclogs/gc.log -XX:+PrintGCDetails -XX:+PrintGCDateStamps -XX:+PrintGCApplicationStoppedTime -XX:+PrintAdaptiveSizePolicy"
JAVA_OPTS="${JAVA_OPTS} -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=5 -XX:GCLogFileSize=100m"
JAVA_OPTS="${JAVA_OPTS} -XX:-OmitStackTraceInFastThrow"
JAVA_OPTS="${JAVA_OPTS} -XX:+AlwaysPreTouch"
JAVA_OPTS="${JAVA_OPTS} -XX:-UseLargePages -XX:-UseBiasedLocking"# 启动服务
echo "start $SERVICE_NAME ..."
nohup $JAVA_HOME/bin/java -jar $JAVA_OPTS -Dserver.port=xx /BASE_DIR/xx.jar > /dev/null