关于aop切面 注解、参数如何获取

aop切面 注解、参数如何获取

在工作中会经常使用aop，这里将aop使用基本方法，获取在切点中使用的获取参数、注解做一个样例。

定义需要切面的注解

@target(elementtype.method)
@retention(retentionpolicy.runtime)
@documented
public @interface anndemo {
    string value();
    boolean isaop() default true;
}

在需要进行切面的方法标注注解

@restcontroller
@requestmapping("/order")
public class ordercontroller {
    @autowired
    private orderservice orderservice;
    @requestmapping("/all")
    @anndemo(value = "all",isaop = false)
    public list<tborder> findall() {
        list<tborder> list = orderservice.getorderlist();
        return list;
    }
    @requestmapping("/page")
    @anndemo(value = "page")
    public list<tborder> findpage(@requestparam("username") string username) {
        list<tborder> listpage = orderservice.getorderslistpage();
        return listpage;
    }
}

定义切面

在切面中获取切点注解，方法，参数的获取

@aspect
@component
public class aspectdemo {
    @pointcut(value = "execution(* com.yin.freemakeradd.controller..*(..))")
    public void excetionmethod() {}
    @pointcut(value = "execution(* com.yin.freemakeradd.controller..*(..)) && @annotation(anndemo)")
    public void excetionnote() { }
    @before("excetionmethod()")
    public void testbefore(joinpoint joinpoint) {
        system.out.println("----------------------------前置通知---");
        object[] args = joinpoint.getargs();
        for (object arg : args) {
            system.out.println(arg);
        }
    }
    @around(value = "execution(* com.yin.freemakeradd.controller..*(..)) && @annotation(anndemo)")
    public object  testbeforenote(proceedingjoinpoint joinpoint) throws throwable {
        //用的最多通知的签名
        signature signature = joinpoint.getsignature();
        methodsignature msg=(methodsignature) signature;
        object target = joinpoint.gettarget();
        //获取注解标注的方法
        method method = target.getclass().getmethod(msg.getname(), msg.getparametertypes());
        //通过方法获取注解
        anndemo annotation = method.getannotation(anndemo.class);
        object proceed;
        //获取参数
        object[] args = joinpoint.getargs();
        system.out.println(annotation.value());
        system.out.println(annotation.isaop());
        for (object arg : args) {
            system.out.println(arg);
        }
        if (objects.isnull(annotation) || !annotation.isaop()) {
            system.out.println("无需处理");
            proceed = joinpoint.proceed();
        }else {
            system.out.println("进入aop判断");
            proceed = joinpoint.proceed();
            if(proceed instanceof list){
                list proceedlst = (list) proceed;
                if(!collectionutils.isempty(proceedlst)){
                    tborder tborder = new tborder();
                    tborder.setpaymenttype("fffffffffffffffffff");
                    arraylist<tborder> tborderlst = new arraylist<>();
                    tborderlst.add(tborder);
                    return tborderlst;
                }
            }
            system.out.println(proceed);
        }
        return proceed;
    }
}

aop中获取自定义注解的属性值

自定义注解

@target(elementtype.method)
@retention(retentionpolicy.runtime)
public @interface systemlog {
 
    public string description() default "";
}

用在方法上

@responsebody
@validrequestbody
@requestmapping("/login")
@systemlog(description="登录")
public globalresponse login(@requestbody @valid user user, bindingresult bindingresult){
    ......
}

获取注解的属性值

@around("@annotation(com.xxx.xxx.xxx.systemlog)")
public object around(proceedingjoinpoint joinpoint) throws throwable{
    systemlog systemlog = ((methodsignature)joinpoint.getsignature()).getmethod().getannotation(systemlog.class);    
    ......
}

以上为个人经验，希望能给大家一个参考，也希望大家多多支持。