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C3P0数据库连接问题

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JDBC

class="cursor-pointer"> 详细描述

职业表中如何查询在学总数?

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数据库

class="cursor-pointer"> 详细描述

Nginx配置以后部分路径仍然需要域名+端口号才能访问

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复盘踩坑

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 错误截图

使用SpringAOP进行日志管理，控制台没输出日志？

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aop

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 源码

@Component//让这个类被spring当作一个bean管理
/**标明这个类是一个切面对象*/
@Aspect
public class LogAspect {
    Logger logger = Logger.getLogger(LogAspect.class);

    /**
     * execution([权限修饰符] [返回值类型] [简单类名/全类名] [方法名]([参数列表]))
     */
    @Around(value = "execution(public * cn.wp.controller.*.*(..))")
    public Object timeFirst(ProceedingJoinPoint pjp) throws Throwable {
        long t1 = System.currentTimeMillis();
        Object[] arg = pjp.getArgs();
        String method = pjp.getSignature().getName();
        Object trage = pjp.getTarget();
//      调用 proceed() 方法才会真正的执行实际被代理的方法
        Object result = pjp.proceed();
        long t2 = System.currentTimeMillis();
        logger.info("响应时间===============================================" + (t2 - t1));
        logger.info("方法名=================================================" + method);
        return result;
    }

    @Around(value = "execution(public * cn.wp.service.impl.*.*(..))")
    public Object timeSecond(ProceedingJoinPoint pjp) throws Throwable {
        logger.info("jinru1.......................................");
        long t3 = System.currentTimeMillis();
        Object[] arg = pjp.getArgs();
        String method = pjp.getSignature().getName();
        Object trage = pjp.getTarget();
        Object result = pjp.proceed();
        long t4 = System.currentTimeMillis();
        logger.info("访问数据库时间===============================================" + (t4 - t3));
        logger.info("方法名=================================================" + method);
        return result;
    }
}

json是干什么用的？怎么使用？怎么去编写？

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json

class="cursor-pointer"> 详细描述

idea部署tomcat运行web项目出错

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jetty/tomcat

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 错误截图