Aop(Aspect Orient Programming)
使用场景实现一些共性需求:
- 收集上报指定一些 重要的关键方法的入参,执行时间返回结果等等关键的信息进行上报到服务器,可以作为后面的调优。
- 幂等性的前置校验
- 调用重试机制
- 入参的共性校验
- 方法执行的进行相关扩展行为,记录日志,启动其他任务等等。
1.参数校验实现
1. 自定义注解 参数,集合等等校验注解
1.1 FiledCheck字段校验注解
package com.eshore.iscm.aop.validate.validator.anno;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
@Target({ ElementType.PARAMETER, ElementType.FIELD })
@Retention(RetentionPolicy.RUNTIME)
public @interface FieldCheck {
public String defaultMessage() default "";
public boolean notNull() default false;
public String notNullMessage() default "";
public boolean numeric() default false;
public String numericMessage() default "";
public boolean stringLimitNumeric() default false;
public String stringLimitNumericMessage() default "";
public int minLen() default -1;
public int maxLen() default -1;
public String minLenMessage() default "";
public String maxLenMessage() default "";
public double minNum() default -999999999;
public double maxNum() default -999999999;
public String minNumMessage() default "";
public String maxNumMessage() default "";
}
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1.2 ListCheck集合校验注解
package com.eshore.iscm.aop.validate.validator.anno;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
@Target({ ElementType.PARAMETER, ElementType.FIELD })
@Retention(RetentionPolicy.RUNTIME)
public @interface ListCheck {
public boolean notNull() default false;
public String notNullMessage() default "";
public int minLen() default -1;
public String minLenMessage() default "";
public int maxLen() default -1;
public String maxLenMessage() default "";
public String defaultMessage() default "";
}
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1.3方法参数校验注解 ModelCheck
@Target({ ElementType.METHOD, ElementType.PARAMETER })
@Retention(RetentionPolicy.RUNTIME)
public @interface ModelCheck {
public boolean notNull() default true;
public String notNullMessage() default "方法参数不能为空";
}
1.4 参数校验注解
package com.eshore.iscm.aop.validate.validator.anno;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
@Target({ ElementType.METHOD })
@Retention(RetentionPolicy.RUNTIME)
public @interface ParamCheck {
}
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2.定义Aop并且通过反射进行和注解作用的地方(方法,参数,类)进行关联 反射可以单独写一个类,Aop的配置可以单独写一个类
2.1通过反射组合上面参数校验的注解灵活使用 (ParamterCheckComp 参数校验组合类)
package com.eshore.iscm.aop.validate.validator.comp;
import java.lang.annotation.Annotation;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.aspectj.lang.ProceedingJoinPoint;
import org.springframework.core.LocalVariableTableParameterNameDiscoverer;
import org.springframework.stereotype.Component;
import org.springframework.util.ObjectUtils;
import org.springframework.util.StringUtils;
import com.eshore.iscm.aop.validate.validator.anno.FieldCheck;
import com.eshore.iscm.aop.validate.validator.anno.ListCheck;
import com.eshore.iscm.aop.validate.validator.anno.ModelCheck;
import com.eshore.khala.common.exception.ValidateParameterException;
@Component
public class ParamterCheckComp {
LocalVariableTableParameterNameDiscoverer disc = new LocalVariableTableParameterNameDiscoverer();
public void checkValid(String methodName, Object target, Object[] args) throws ValidateParameterException {
String str = "";
try {
Method method = getMethodByClassAndName(target.getClass(), methodName, args);
Annotation[][] annotations = method.getParameterAnnotations();
String[] paramNames = disc.getParameterNames(method);
if (annotations != null) {
for (int i = 0; i < annotations.length; i++) {
Annotation[] anno = annotations[i];
for (int j = 0; j < anno.length; j++) {
if (annotations[i][j].annotationType().equals(ModelCheck.class)) {
ModelCheck mcheck = (ModelCheck) annotations[i][j];
str = checkModel(args[i], mcheck, paramNames[i]);
} else if (annotations[i][j].annotationType().equals(ListCheck.class)) {
ListCheck lcheck = (ListCheck) annotations[i][j];
str = checkListParam(args[i], lcheck, paramNames[i]);
} else if (annotations[i][j].annotationType().equals(FieldCheck.class)) {
FieldCheck fcheck = (FieldCheck) annotations[i][j];
str = checkField(fcheck, args[i], paramNames[i]);
}
if (StringUtils.hasText(str)) {
throw new ValidateParameterException(str);
}
}
}
}
} catch (Throwable e) {
if (ObjectUtils.isEmpty(str)) {
str = e.getMessage();
}
throw new ValidateParameterException(str);
}
}
public void checkValid(ProceedingJoinPoint joinPoint) throws ValidateParameterException {
Object[] args = null;
Method method = null;
Object target = null;
String methodName = null;
String str = "";
try {
methodName = joinPoint.getSignature().getName();
target = joinPoint.getTarget();
args = joinPoint.getArgs();
method = getMethodByClassAndName(target.getClass(), methodName, args);
Annotation[][] annotations = method.getParameterAnnotations();
String[] paramNames = disc.getParameterNames(method);
if (annotations != null) {
for (int i = 0; i < annotations.length; i++) {
Annotation[] anno = annotations[i];
for (int j = 0; j < anno.length; j++) {
if (annotations[i][j].annotationType().equals(ModelCheck.class)) {
ModelCheck mcheck = (ModelCheck) annotations[i][j];
str = checkModel(args[i], mcheck, paramNames[i]);
} else if (annotations[i][j].annotationType().equals(ListCheck.class)) {
ListCheck lcheck = (ListCheck) annotations[i][j];
str = checkListParam(args[i], lcheck, paramNames[i]);
} else if (annotations[i][j].annotationType().equals(FieldCheck.class)) {
FieldCheck fcheck = (FieldCheck) annotations[i][j];
str = checkField(fcheck, args[i], paramNames[i]);
}
if (StringUtils.hasText(str)) {
throw new ValidateParameterException(str);
}
}
}
}
} catch (Throwable e) {
throw new ValidateParameterException(str);
}
}
private String checkField(FieldCheck check, Object arg, String paramNames) {
int length = 0;
if (arg == null) {
if (check.notNull()) {
return getNotNullMessage(paramNames, check);
} else if (check.numeric()) {
return getNumericMessage(paramNames, check);
} else if (check.minLen() > 0) {
return getMinLenMessage(paramNames, check);
} else if (check.maxLen() > 0) {
return getMaxLenMessage(paramNames, check);
} else if (check.minNum() != -999999999) {
return getMinNumMessage(paramNames, check, false);
} else if (check.maxNum() != -999999999) {
return getMaxNumMessage(paramNames, check, false);
} else {
return "";
}
}
Class<?> cls = arg.getClass();
String clname = cls.getName();
boolean arraybl = false, strbl = false, intbl = false, longbl = false, doublebl = false, floatbl = false,
blbl = false;
if (clname.equals("java.lang.Integer") || clname.equals("int")) {
intbl = true;
} else if (clname.equals("java.lang.Long") || clname.equals("long")) {
longbl = true;
} else if (clname.equals("java.lang.Double") || clname.equals("double")) {
doublebl = true;
} else if (clname.equals("java.lang.Float") || clname.equals("float")) {
floatbl = true;
} else if (clname.equals("java.lang.String")) {
strbl = true;
} else if (clname.equals("java.util.ArrayList")) {
arraybl = true;
} else if (clname.equals("java.util.Boolean")) {
blbl = true;
}
boolean numbl = intbl || longbl || floatbl || doublebl;
boolean lenbl = arraybl || strbl;
if (arg != null) {
if (strbl)
length = (String.valueOf(arg)).length();
if (arraybl)
length = ((List<Object>) arg).size();
}
if (check.numeric() && arg != null) {
try {
new BigDecimal(String.valueOf(arg));
} catch (Exception e) {
return getNumericMessage(paramNames, check);
}
}
if (lenbl) {
if (check.maxLen() > 0 && (length > check.maxLen())) {
return getMaxLenMessage(paramNames, check);
}
if (check.minLen() > 0 && (length < check.minLen())) {
return getMinLenMessage(paramNames, check);
}
}
if (numbl) {
if (check.minNum() != -999999999) {
try {
boolean errbl = false;
if (longbl || intbl) {
long fieldValue = Long.parseLong(String.valueOf(arg));
if (fieldValue < check.minNum()) {
errbl = true;
}
}
if (floatbl || doublebl) {
double fieldValue = Double.parseDouble(String.valueOf(arg));
if (fieldValue < check.minNum()) {
errbl = true;
}
}
if (errbl) {
return getMinNumMessage(paramNames, check, false);
}
} catch (Exception e) {
return getMinNumMessage(paramNames, check, true);
}
}
if (check.maxNum() != -999999999) {
try {
boolean errbl = false;
if (longbl || intbl) {
long fieldValue = Long.parseLong(String.valueOf(arg));
if (fieldValue > check.maxNum()) {
errbl = true;
}
} else if (floatbl || doublebl) {
double fieldValue = Double.parseDouble(String.valueOf(arg));
if (fieldValue > check.maxNum()) {
errbl = true;
}
}
if (errbl) {
return getMaxNumMessage(paramNames, check, false);
}
} catch (Exception e) {
return getMaxNumMessage(paramNames, check, true);
}
}
}
return "";
}
private String checkListParam(Object args, ListCheck lcheck, String paramNames) throws Exception {
String retStr = "";
if (args == null) {
if (lcheck.notNull()) {
if (lcheck.notNullMessage().equals("")) {
return paramNames + "不允许为空";
} else {
return lcheck.defaultMessage();
}
} else if (lcheck.maxLen() != -1) {
if (lcheck.defaultMessage().equals("")) {
return paramNames + "不允许为空";
} else {
return lcheck.defaultMessage();
}
} else if (lcheck.minLen() != -1) {
if (lcheck.minLenMessage().equals("")) {
return paramNames + "不允许为空";
} else {
return lcheck.defaultMessage();
}
}
}
if (args != null) {
String aclz = args.getClass().getName();
if (aclz.equals("java.util.ArrayList")) {
List<Object> argList = (List<Object>) args;
int size = argList.size();
if (lcheck.minLen() != -1) {
if (size < lcheck.minLen()) {
retStr = lcheck.minLenMessage();
if (retStr.equals("")) {
retStr = lcheck.defaultMessage();
}
if (retStr.equals("")) {
retStr = paramNames + "集合大小最小为" + lcheck.minLen();
}
return retStr;
}
}
if (lcheck.maxLen() != -1) {
if (size < lcheck.maxLen()) {
retStr = lcheck.maxLenMessage();
if (retStr.equals("")) {
retStr = lcheck.defaultMessage();
}
if (retStr.equals("")) {
retStr = paramNames + "集合大小最大为" + lcheck.maxLen();
}
return retStr;
}
}
for (Object arg : argList) {
if (arg != null) {
retStr = checkModel(arg, null, "");
}
if (!retStr.equals("")) {
break;
}
}
}
}
return retStr;
}
private String checkModel(Object args, ModelCheck mcheck, String paramNames) throws Exception {
String retStr = "";
if (args == null
|| (args instanceof String) && "".equals(String.valueOf(args))
|| (args instanceof Object[]) && ((Object[]) args).length == 0) {
if (mcheck.notNull()) {
if (mcheck.notNullMessage().equals("")) {
return paramNames + "不允许为空";
} else {
return mcheck.notNullMessage();
}
}
return "";
}
Field[] field = getBeanFields(args);
for (int j = 0; j < field.length; j++) {
FieldCheck check = field[j].getAnnotation(FieldCheck.class);
if (check != null) {
retStr = validateFiled(check, field[j], args);
if (StringUtils.hasText(retStr)) {
return retStr;
}
} else {
ListCheck lcheck = field[j].getAnnotation(ListCheck.class);
if (lcheck != null) {
field[j].setAccessible(true);
retStr = checkListParam(field[j].get(args), lcheck, field[j].getName());
if (StringUtils.hasText(retStr)) {
return retStr;
}
}
}
}
return retStr;
}
public Field[] getBeanFields(Object obj) {
List<Field> fieldList = new ArrayList<>();
Class<?> tmp = obj.getClass();
while (tmp != null && tmp instanceof Object) {
fieldList.addAll(Arrays.asList(tmp.getDeclaredFields()));
tmp = tmp.getSuperclass();
}
return fieldList.toArray(new Field[fieldList.size()]);
}
public String validateFiled(FieldCheck check, Field field, Object args) throws Exception {
field.setAccessible(true);
int length = 0;
Class<?> cls = field.getType();
String clname = cls.getName();
boolean arraybl = false, strbl = false, intbl = false, longbl = false, doublebl = false, floatbl = false,
blbl = false;
if (clname.equals("java.lang.Integer") || clname.equals("int")) {
intbl = true;
} else if (clname.equals("java.lang.Long") || clname.equals("long")) {
longbl = true;
} else if (clname.equals("java.lang.Double") || clname.equals("double")) {
doublebl = true;
} else if (clname.equals("java.lang.Float") || clname.equals("float")) {
floatbl = true;
} else if (clname.equals("java.lang.String")) {
strbl = true;
} else if (clname.equals("java.util.ArrayList")) {
arraybl = true;
} else if (clname.equals("java.util.Boolean")) {
blbl = true;
}
boolean numbl = intbl || longbl || floatbl || doublebl;
boolean lenbl = arraybl || strbl;
if (field.get(args) != null) {
if (strbl)
length = (String.valueOf(field.get(args))).length();
if (arraybl)
length = ((List<Object>) field.get(args)).size();
}
if (check.notNull()) {
if (field.get(args) == null || "".equals(String.valueOf(field.get(args)))) {
return getNotNullMessage(field.getName(), check);
}
}
if (check.numeric() && field.get(args) != null) {
try {
new BigDecimal(String.valueOf(field.get(args)));
} catch (Exception e) {
return getNumericMessage(field.getName(), check);
}
}
if (check.stringLimitNumeric() && field.get(args) != null) {
try {
if(!StringUtils.isEmpty(String.valueOf(field.get(args)))){
new BigDecimal(String.valueOf(field.get(args)));
}
} catch (Exception e) {
return getStringLimitNumericMessage(field.getName(), check);
}
}
if (lenbl) {
if (check.maxLen() > 0 && (length > check.maxLen())) {
return getMaxLenMessage(field.getName(), check);
}
if (check.minLen() > 0 && (length < check.minLen())) {
return getMinLenMessage(field.getName(), check);
}
}
if (numbl) {
if (check.minNum() != -999999999) {
try {
boolean errbl = false;
if (longbl || intbl) {
long fieldValue = Long.parseLong(String.valueOf(field.get(args)));
if (fieldValue < check.minNum()) {
errbl = true;
}
}
if (floatbl || doublebl) {
double fieldValue = Double.parseDouble(String.valueOf(field.get(args)));
if (fieldValue < check.minNum()) {
errbl = true;
}
}
if (errbl) {
return getMinNumMessage(field.getName(), check, false);
}
} catch (Exception e) {
return getMinNumMessage(field.getName(), check, true);
}
}
if (check.maxNum() != -999999999) {
try {
boolean errbl = false;
if (longbl || intbl) {
long fieldValue = Long.parseLong(String.valueOf(field.get(args)));
if (fieldValue > check.maxNum()) {
errbl = true;
}
} else if (floatbl || doublebl) {
double fieldValue = Double.parseDouble(String.valueOf(field.get(args)));
if (fieldValue > check.maxNum()) {
errbl = true;
}
}
if (errbl) {
return getMaxNumMessage(field.getName(), check, false);
}
} catch (Exception e) {
return getMaxNumMessage(field.getName(), check, true);
}
}
}
return "";
}
private String getMaxNumMessage(String name, FieldCheck check, boolean err) {
if (check.maxNumMessage().length() > 0) {
return check.maxNumMessage();
}
if (check.defaultMessage().length() > 0) {
return check.defaultMessage();
}
if (!err)
return name + "必须不大于" + check.maxNum();
else
return name + "必须为数值型,且不大于" + check.maxNum();
}
private String getMinNumMessage(String name, FieldCheck check, boolean err) {
if (check.minNumMessage().length() > 0) {
return check.minNumMessage();
}
if (check.defaultMessage().length() > 0) {
return check.defaultMessage();
}
if (!err)
return name + "必须不小于" + check.minNum();
else
return name + "必须为数值型,且不小于" + check.minNum();
}
private String getMinLenMessage(String name, FieldCheck check) {
if (check.minLenMessage().length() > 0) {
return check.minLenMessage();
}
if (check.defaultMessage().length() > 0) {
return check.defaultMessage();
}
return name + "长度不能小于" + check.minLen();
}
private String getMaxLenMessage(String name, FieldCheck check) {
if (check.maxLenMessage().length() > 0) {
return check.maxLenMessage();
}
if (check.defaultMessage().length() > 0) {
return check.defaultMessage();
}
return name + "长度不能大于" + check.maxLen();
}
private String getNumericMessage(String name, FieldCheck check) {
if (check.numericMessage().length() > 0) {
return check.numericMessage();
}
if (check.defaultMessage().length() > 0) {
return check.defaultMessage();
}
return name + "必须为数值型";
}
private String getStringLimitNumericMessage(String name, FieldCheck check) {
if (check.stringLimitNumericMessage().length() > 0) {
return check.stringLimitNumericMessage();
}
if (check.defaultMessage().length() > 0) {
return check.defaultMessage();
}
return name + "必须为空串或数值型";
}
private String getNotNullMessage(String fieldName, FieldCheck check) {
if (check.notNullMessage().length() > 0) {
return check.notNullMessage();
}
if (check.defaultMessage().length() > 0) {
return check.defaultMessage();
}
return fieldName + "不能为空";
}
@SuppressWarnings("rawtypes")
public Method getMethodByClassAndName(Class c, String methodName, Object[] args) throws Exception {
boolean pbl = true;
if (args != null && args.length > 0) {
Class<?>[] parameterTypes = new Class<?>[args.length];
if (args != null && args.length > 0) {
int i = 0;
for (Object obj : args) {
if (obj != null) {
Class<?> clz = obj.getClass();
if (clz.getName().equals("java.util.ArrayList")) {
clz = List.class;
}
parameterTypes[i++] = clz;
} else {
pbl = false;
break;
}
}
if (pbl) {
return c.getDeclaredMethod(methodName, parameterTypes);
}
}
}
Method[] methods = c.getDeclaredMethods();
for (Method method : methods) {
if (method.getName().equals(methodName)) {
if (args != null) {
if (method.getParameterCount() == args.length) {
return method;
}
} else {
return method;
}
}
}
return null;
}
}
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3.在SpringBoot上面配置上Aop进行拦截实现
3.1 Aop的5大通知,在什么地方进行拦截的通知
- @Before前置通知 方法执行之前进行执行
- @AfterReturning: 当前通知方法在原始切入点方法正常执行完毕后运行
- @AfterThrowing: 当前通知方法在原始切入点方法运行抛出异常后执行
- @Around: 设置当前通知方法与切入点之间的绑定关系,当前通知方法在原始切入点方法前后运行 最强大的通知类型,可以对方法的入参,执行,返回结果等和方面细节进行调节
- @After: 当前通知方法在原始切入点方法后运行
package com.eshore.iscm.aop.validate.validator.asp;
import org.aspectj.lang.JoinPoint;
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.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import com.eshore.iscm.aop.validate.validator.comp.ParamterCheckComp;
@Component
@Aspect
public class ParamAspect {
@Autowired
private ParamterCheckComp paramterCheckComp;
@Pointcut("@annotation(com.eshore.iscm.aop.validate.validator.anno.ParamCheck)")
public void check() {
}
@Around(value = "check()")
public Object doBefore(JoinPoint joinPoint) throws Throwable {
Object object = null;
paramterCheckComp.checkValid(joinPoint.getSignature().getName(), joinPoint.getTarget(), joinPoint.getArgs());
object = ((ProceedingJoinPoint) joinPoint).proceed();
return object;
}
}
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4. 自定义的注解的使用FieldCheck可以作用在字段上面
package com.eshore.iscm.common.model;
import javax.validation.constraints.Min;
import com.eshore.iscm.aop.validate.validator.anno.FieldCheck;
import io.swagger.annotations.ApiModelProperty;
import lombok.Data;
@Data
public class PageParam {
@ApiModelProperty(value = "当前页", required = true)
@Min(value = 0, message = "当前页最小为1")
@FieldCheck(notNull = true, notNullMessage = "page属性不允许为空", minNum = 1, minNumMessage = "页码最小为1")
protected Integer page;
@ApiModelProperty(value = "每页显示条数", required = true)
@Min(value = 1, message = "每页显示条数最小为1")
@FieldCheck(notNull = true, notNullMessage = "limit属性不允许为空", minNum = 1, minNumMessage = "页显示条数最小为1")
protected Integer limit;
}
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5. ModelCheck 参数使用
@ParamCheck
@ApiOperation(value = "删除广告", notes = "删除广告")
@PostMapping("/delete")
public Result<String> delete(@RequestParam("advertisementIds") @ModelCheck(notNull = true) String[] advertisementIds) {
log.info(getClass().getSimpleName() + "#delete param:{}", JsonUtil.toJSONString(advertisementIds));
try {
advertisementService.deleteByIds(advertisementIds);
return Result.succeed("删除成功");
} catch (Exception e) {
log.error("delete error!", e);
return Result.failed(e.getMessage());
}
}
2. 权限校验实现
注意:权限校验需要在方法执行之前进行相关的校验,也就是使用前置通知进行 @Before
1. 自定义注解
package com.eshore.iscm.aop.validate.validator.anno;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.ANNOTATION_TYPE,ElementType.METHOD})
public @interface Authenticat {
}
2. 使用Aop并且用反射进行拦截
package com.eshore.iscm.aop.validate.validator.asp;
import com.eshore.iscm.aop.validate.validator.anno.Authenticat ;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;
import java.lang.reflect.Method;
import java.util.HashSet;
@Aspect
@Component
public class AuthAspect {
@Pointcut("@annotation()")
public void pointCut(){
}
@Before("pointCut()")
public void dobefore(JoinPoint joinPoint){
HashSet<User> sets = new HashSet<User>();
MethodSignature signature = (MethodSignature) joinPoint.getSignature();
Method method = signature.getMethod();
Authenticat annotation = method.getAnnotation(Authenticat .class);
if(annotation != null && !sets.contains(annotation.value()) ){
throw new RuntimeException("用户没有权限进行访问!!!")
}
}
}
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对你有帮助别忘记点赞一个呦,点赞敲代码没有bug,今年马上找到女朋友,哈哈!!,当然更加重要的是可以评论一下你们面试当中遇到的相关AOp的知识,欢迎大家在评论区中打出你们遇到Aop的相关的坑!!!和对Aop的相关理解。