spring通过aop获取方法参数和参数值
自定义注解
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package com.xiaolc.aspect;
import java.lang.annotation.*;
/**
* @author lc
* @date 2019/9/10
*/
@Documented
@Target({ElementType.TYPE, ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
public @interface LiCheng {
}
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切面
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package com.xiaolc.aspect;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.springframework.core.DefaultParameterNameDiscoverer;
import org.springframework.core.ParameterNameDiscoverer;
import org.springframework.stereotype.Component;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;
/**
* 获取方法上的注解值
*/
@Component
@Aspect
public class AuditAnnotationAspect {
@Around("@annotation(liCheng))")
private static Map getFieldsName(ProceedingJoinPoint joinPoint,LiCheng liCheng) throws ClassNotFoundException, NoSuchMethodException {
String classType = joinPoint.getTarget().getClass().getName();
String methodName = joinPoint.getSignature().getName();
// 参数值
Object[] args = joinPoint.getArgs();
Class<?>[] classes = new Class[args.length];
for (int k = 0; k < args.length; k++) {
if (!args[k].getClass().isPrimitive()) {
// 获取的是封装类型而不是基础类型
String result = args[k].getClass().getName();
Class s = map.get(result);
classes[k] = s == null ? args[k].getClass() : s;
}
}
ParameterNameDiscoverer pnd = new DefaultParameterNameDiscoverer();
// 获取指定的方法，第二个参数可以不传，但是为了防止有重载的现象，还是需要传入参数的类型
Method method = Class.forName(classType).getMethod(methodName, classes);
// 参数名
String[] parameterNames = pnd.getParameterNames(method);
// 通过map封装参数和参数值
HashMap<String, Object> paramMap = new HashMap();
for (int i = 0; i < parameterNames.length; i++) {
paramMap.put(parameterNames[i], args[i]);
System.out.println("参数名："+parameterNames[i]+"\n参数值"+args[i]);
}
return paramMap;
}
private static HashMap<String, Class> map = new HashMap<String, Class>() {
{
put("java.lang.Integer", int.class);
put("java.lang.Double", double.class);
put("java.lang.Float", float.class);
put("java.lang.Long", Long.class);
put("java.lang.Short", short.class);
put("java.lang.Boolean", boolean.class);
put("java.lang.Char", char.class);
}
};
}
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aop切面 注解、参数获取
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。
1、定义需要切面的注解
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@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface AnnDemo {
String value();
boolean isAop() default true;
}
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2、在需要进行切面的方法标注注解
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@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;
}
}
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3、定义切面
在切面中获取切点注解，方法，参数的获取
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@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;
}
}
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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服务器之家。
原文链接：https://blog.csdn.net/qq_41988504/article/details/100726527