在方法执行的前后，切入代码；经典的service层切入事务；
@Aspect注解是切面注解类
@Pointcut切点定义
@Before是方法执行前调用
@After是方法执行后调用
@AfterReturning方法执行返回值调用
Service层本身就可以切入事务，所以我们这类搞个常用的 切controller层方法
每个执行controller层的方法 都记录下请求Url，访问者IP 执行类方法参数等信息；
紧接上一讲，这里只是多了切面类，项目结构：
贴下代码：
1.切面类com.cy.aspect.RequestAspect.java:
package com.cy.aspect; import javax.servlet.http.HttpServletRequest;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.AfterReturning;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
import com.cy.entity.Student;
import ch.qos.logback.classic.Logger; /**
* 切面类
*/
@Aspect
@Component
public class RequestAspect { private Logger logger= (Logger) LoggerFactory.getLogger(RequestAspect.class); /**
* Pointcut定义切点
* public修饰符的 返回值任意 com.cy.controller包下面的任意类的任意方法任意参数
*/
@Pointcut("execution(public * com.cy.controller.*.*(..))")
public void log(){ } @Before("log()")
public void doBefore(JoinPoint joinPoint){
logger.info("方法执行前...");
ServletRequestAttributes sra = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
HttpServletRequest request = sra.getRequest();
logger.info("url: " + request.getRequestURI()); //url
logger.info("ip: " + request.getRemoteHost()); //ip
logger.info("method: "+request.getMethod()); //post or get? or ?
logger.info("class.method: " + joinPoint.getSignature().getDeclaringTypeName() + "." + joinPoint.getSignature().getName());
logger.info("args: "+joinPoint.getArgs());
Student student = (Student) joinPoint.getArgs()[0];
logger.info(student.toString());
} @After("log()")
public void doAfter(JoinPoint joinPoint){
logger.info("方法执行后...");
} @AfterReturning(returning="result", pointcut="log()")
public void doAfterReturnint(Object result){
logger.info("方法返回值：" + result);
}
}
回顾前一章的StudentController是这样的：
/**
* 添加学生
* @param student
* @return
*/
@RequestMapping("/add")
public String add(@Valid Student student, BindingResult bindingResult){
if(bindingResult.hasErrors()){
return bindingResult.getFieldError().getDefaultMessage();
}else{
studentService.add(student);
return "添加成功";
}
}
测试：
http://localhost/studentAdd.html正常添加一个学生，查看控制台信息：
2018-03-25 16:34:53.984 INFO 3744 --- [p-nio-80-exec-1] com.cy.aspect.RequestAspect : 方法执行前...
2018-03-25 16:34:53.984 INFO 3744 --- [p-nio-80-exec-1] com.cy.aspect.RequestAspect : url: /student/add
2018-03-25 16:34:53.984 INFO 3744 --- [p-nio-80-exec-1] com.cy.aspect.RequestAspect : ip: 0:0:0:0:0:0:0:1
2018-03-25 16:34:53.984 INFO 3744 --- [p-nio-80-exec-1] com.cy.aspect.RequestAspect : method: POST
2018-03-25 16:34:53.986 INFO 3744 --- [p-nio-80-exec-1] com.cy.aspect.RequestAspect : class.method: com.cy.controller.StudentController.add
2018-03-25 16:34:53.986 INFO 3744 --- [p-nio-80-exec-1] com.cy.aspect.RequestAspect : args: [Ljava.lang.Object;@4232f676
2018-03-25 16:34:53.986 INFO 3744 --- [p-nio-80-exec-1] com.cy.aspect.RequestAspect : Student [id=null, name=余学海, age=28]
Hibernate: select next_val as id_val from hibernate_sequence for update
Hibernate: update hibernate_sequence set next_val= ? where next_val=?
Hibernate: insert into t_student (age, name, id) values (?, ?, ?)
2018-03-25 16:34:54.067 INFO 3744 --- [p-nio-80-exec-1] com.cy.aspect.RequestAspect : 方法执行后...
2018-03-25 16:34:54.067 INFO 3744 --- [p-nio-80-exec-1] com.cy.aspect.RequestAspect : 方法返回值：添加成功