Spring AOP中的切面以及部分项目准备工作java北有孤酒的博客-

项目准备工作

电子货币交易平台：

驾考平台： 

教务系统： 

 Spring AOP中的切面

工程目录：

 工程所需的依赖：

pom.xml

 <?xml version="1.0" encoding="UTF-8"?> <project xmlns="https://maven.apache.org/POM/4.0.0" xmlns:xsi="https://www.w3.org/2001/XMLSchema-instance"  xsi:schemaLocation="https://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">  <modelVersion>4.0.0</modelVersion>  <parent>   <groupId>org.springframework.boot</groupId>   <artifactId>spring-boot-starter-parent</artifactId>   <version>2.2.5.RELEASE</version>   <relativePath/> <!-- lookup parent from repository -->  </parent>  <groupId>com.newer</groupId>  <artifactId>aop2</artifactId>  <version>0.1</version>  <name>aop2</name>  <description>Demo project for Spring Boot</description>   <properties>   <java.version>11</java.version>  </properties>   <dependencies>   <dependency>    <groupId>org.springframework.boot</groupId>    <artifactId>spring-boot-starter-web</artifactId>   </dependency>      <dependency>    <groupId>org.springframework.boot</groupId>    <artifactId>spring-boot-starter-aop</artifactId>   </dependency>    <dependency>    <groupId>org.springframework.boot</groupId>    <artifactId>spring-boot-devtools</artifactId>    <scope>runtime</scope>    <optional>true</optional>   </dependency>   <dependency>    <groupId>org.springframework.boot</groupId>    <artifactId>spring-boot-starter-test</artifactId>    <scope>test</scope>    <exclusions>     <exclusion>      <groupId>org.junit.vintage</groupId>      <artifactId>junit-vintage-engine</artifactId>     </exclusion>    </exclusions>   </dependency>  </dependencies>   <build>   <plugins>    <plugin>     <groupId>org.springframework.boot</groupId>     <artifactId>spring-boot-maven-plugin</artifactId>    </plugin>   </plugins>  </build>  </project> 

其中AOP所需的依赖： 

      <!-- AOP -->     <dependency>       <groupId>org.springframework.boot</groupId>       <artifactId>spring-boot-starter-aop</artifactId>     </dependency>

application.properties(配置信息)

 spring.http.log-request-details=true logging.level.web=debug 

Aop2Application.java

 package com.newer.aop;  import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication;  @SpringBootApplication public class Aop2Application {   public static void main(String[] args) {   SpringApplication.run(Aop2Application.class, args);  }  } 

AppService.java

 package com.newer.aop; /**  * 业务逻辑  *   * @author Admin  *  */ public interface AppService {   String sayHello(String name);    String sayBye(String name); } 

Log.java

 package com.newer.aop.aspect;  import java.lang.annotation.ElementType; import java.lang.annotation.Retention; import java.lang.annotation.RetentionPolicy; import java.lang.annotation.Target;  //目标 //有效期（保留策略） @Target(ElementType.METHOD) @Retention(RetentionPolicy.RUNTIME) public @interface Log {   /**   * 是否启用   * @return   */  boolean enable() default true; } 

LogAspect.java

 package com.newer.aop.aspect;  import org.aspectj.lang.ProceedingJoinPoint; import org.aspectj.lang.annotation.After; import org.aspectj.lang.annotation.AfterReturning; import org.aspectj.lang.annotation.AfterThrowing; import org.aspectj.lang.annotation.Around; import org.aspectj.lang.annotation.Aspect; import org.aspectj.lang.annotation.Before; import org.aspectj.lang.annotation.Pointcut; import org.springframework.stereotype.Component;  //组件，容器管理生命周期 @Component //定义为切面（动态织入业务逻辑代码） @Aspect public class LogAspect {  // 切入点,为注解Log标记的位置 // 不同包com.newer.aop.aspect。Log // @Pointcut("@annotation(com.newer.aop.aspect。Log)")  @Pointcut("@annotation(Log)")  public void pointcut() {     }     // 基于方法的织入 // 5个在方法中插入你的代码的时间点，根据需要定义某几个 //  // @Before // @After // @Around // @AfterThrowing // @AfterReturning    @Before("pointcut()")  public void a() {   System.out.println("@Before");  }    @After("pointcut()")  public void b() {   System.out.println("@After");  }   // 环绕 // 类似于过滤器 // ProceedingJoinPoint:连接点  @Around("pointcut()")     public Object c(ProceedingJoinPoint joinPoint) throws Throwable {      Object[] args= joinPoint.getArgs();   String arg0=args[0].toString();      if(arg0.length()<4) {    arg0="spring boot";   }else {    arg0=arg0.toUpperCase();   }      args[0]=arg0;      System.out.println("前"); //  执行方法   Object o= joinPoint.proceed(args);   System.out.println("后");    //        return o;  }   @AfterThrowing("pointcut()")     public void d() {   System.out.println("@AfterThrowing");     }    @AfterReturning("pointcut()")     public void e() {   System.out.println("@AfterReturning");     }        } 

AppServiceImpl.java

 package com.newer.aop;  import org.springframework.stereotype.Service;  import com.newer.aop.aspect.Log;  @Service public class AppServiceImpl implements AppService{   @Log  @Override  public String sayHello(String name) {   System.out.println("sayHello");   return "hello"+ name;  }   // 基于动态代理模式 // @Log(enable=false)  @Log  @Override  public String sayBye(String name) {   System.out.println("sayBye");   return "bye"+ name;  }  } 

AuthRole.java

 package com.newer.aop.aspect;  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 AuthRole {   Role value(); } 

AuthRoleAspect.java

 package com.newer.aop.aspect;  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.stereotype.Component;  @Component @Aspect public class AuthRoleAspect {   @Pointcut("@annotation(AuthRole)")  public void pointcut() {     }    /**   *    * @param joinPoint   * @return   * @throws Throwable   */  @Around("pointcut()")  public Object todo(ProceedingJoinPoint joinPoint) throws Throwable {      System.out.println("todo"); //  加入特定代码        Object[] args=joinPoint.getArgs();         String from =args[0].toString(); //             验证余额 //          返回null，抛出异常          Object o=   joinPoint.proceed(args);   return o;  } } 

Role.java

 package com.newer.aop.aspect;  public enum Role {   STUDENT,TEACHER,ADMIN } 

HomeController.java

 package com.newer.aop;  import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.PathVariable; import org.springframework.web.bind.annotation.RestController;  import com.newer.aop.aspect.AuthRole; import com.newer.aop.aspect.Role;  @RestController public class HomeController {   @Autowired  AppService appService;    /**   * Get /hello/{name   * @param name   * @return   */   // 访问必须是管理员  @AuthRole(value = Role.ADMIN)  @GetMapping("/hello/{name}")  public String a(@PathVariable String name) {   return appService.sayHello(name);  }      /**   * Get /bye/{name}   * @param name   * @return   */ // 访问必须是学生  @AuthRole(Role.STUDENT)  @GetMapping("/bye/{name}")  public String b(@PathVariable String name) {   return appService.sayBye(name);  } } 

运行程序，当name的字数少于4时。出现

当name的字数大于4时：

 同时控制台出现：

 以上就是Spring AOP中的切面以及部分项目阶段的准备工作，有问题的小伙伴，欢迎留言！！！