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commit 9fb8b80bc6
7 changed files with 83 additions and 69 deletions
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36
examples/chapter05/spring-bean-aop-demo/src/main/java/com/lk/demo/FirstBean.java Normal file
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@ -0,0 +1,36 @@
package com.lk.demo;
import jakarta.annotation.PostConstruct;
import jakarta.annotation.PreDestroy;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
@Component
public class FirstBean {
// 通过属性（字段）注入，需要使用@Autowired 注解注入
@Autowired
private SecondBean secondBean;
public FirstBean() {
System.out.println("FirstBean created.");
}
public String getMessage() {
return "Hello FirstBean";
}
public void doSomething() {
System.out.println("Doing something in FirstBean.");
secondBean.doSomething();
}
@PostConstruct
public void init() {
System.out.println("FirstBean initialized.");
}
@PreDestroy
public void destroy() {
System.out.println("FirstBean destroyed.");
}
}

28
examples/chapter05/spring-bean-aop-demo/src/main/java/com/lk/demo/InjectedBean.java
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@ -1,28 +0,0 @@
package com.lk.demo;
import jakarta.annotation.PostConstruct;
import jakarta.annotation.PreDestroy;
import org.springframework.stereotype.Component;
@Component
public class InjectedBean {
public void print() {
System.out.println("hello bean");
}
public InjectedBean() {
System.out.println("InjectedBean created.");
}
@PostConstruct
public void init() {
System.out.println("InjectedBean initialized.");
}
@PreDestroy
public void destroy() {
System.out.println("InjectedBean destroyed.");
}
}

16
examples/chapter05/spring-bean-aop-demo/src/main/java/com/lk/demo/LoggingAspect.java
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@ -23,7 +23,13 @@ public class LoggingAspect {
@Before("execution(* com.lk.demo.*.*(..))") // 切点定义
public void logBefore(JoinPoint joinPoint) {
// 连接点：在方法调用之前
System.out.println("Executing: " + joinPoint.getSignature());
System.out.println("--这是在调用:[" + joinPoint.getSignature()+"]之前");
// 获取方法参数
Object[] args = joinPoint.getArgs();
for (int i = 0; i < args.length; i++) {
System.out.println("参数: "+args[i].toString() );
}
}
/**
@ -37,14 +43,18 @@ public class LoggingAspect {
@Around("execution(* com.lk.demo.MyService.*(..))") // 切点定义
public Object logAround(ProceedingJoinPoint joinPoint) throws Throwable {
// 连接点：在方法调用之前
System.out.println("Before method call...");
System.out.println("**在调用["+ joinPoint.getSignature()+"]之前.");
try {
// Proceed to the actual method invocation
// 执行连接点上的方法
Object result = joinPoint.proceed();
// 连接点：在方法调用之后
System.out.println("After method call...");
if(result!=null){
System.out.println("**在调用["+ joinPoint.getSignature()+"]后得到返回值:"+result.toString());
}else{
System.out.println("**在调用["+ joinPoint.getSignature()+"]之后.");
}
return result;
} catch (Exception e) {

9
examples/chapter05/spring-bean-aop-demo/src/main/java/com/lk/demo/Main.java
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@ -5,16 +5,13 @@ import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import javax.swing.*;
@SpringBootApplication
// CommandLineRunner 是 Spring Boot 提供的一个特定接口，允许你在应用程序上下文加载完成后运行一些代码。
public class Main implements CommandLineRunner {
@Autowired
private MyService myService;
@Autowired
private MyBean myBean;
public static void main(String[] args) {
SpringApplication.run(Main.class, args);
@ -24,8 +21,6 @@ public class Main implements CommandLineRunner {
@Override
public void run(String... args) throws Exception {
myService.doSomething();
System.out.println(myBean.getMessage());
myService.workHard("hard");
}
}

26
examples/chapter05/spring-bean-aop-demo/src/main/java/com/lk/demo/MyBean.java
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@ -1,26 +0,0 @@
package com.lk.demo;
import jakarta.annotation.PostConstruct;
import jakarta.annotation.PreDestroy;
import org.springframework.stereotype.Component;
@Component
public class MyBean {
public String getMessage() {
return "Hello World";
}
public MyBean() {
System.out.println("MyBean created.");
}
@PostConstruct
public void init() {
System.out.println("MyBean initialized.");
}
@PreDestroy
public void destroy() {
System.out.println("MyBean destroyed.");
}
}

22
examples/chapter05/spring-bean-aop-demo/src/main/java/com/lk/demo/MyService.java
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@ -1,17 +1,29 @@
package com.lk.demo;
import jakarta.annotation.PreDestroy;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
@Service
public class MyService {
@Autowired
InjectedBean injectedBean;
private FirstBean firstBean;
private SecondBean secondBean;
// 使用构造函数注入依赖
public MyService(FirstBean firstBean, SecondBean secondBean){
this.firstBean = firstBean;
this.secondBean = secondBean;
}
public void doSomething(){
System.out.println("Doing something");
injectedBean.print();
System.out.println("Doing something in MyService.");
firstBean.doSomething();
secondBean.doAnother();
}
public String workHard(String input){
System.out.println("Working hard with input: " + input);
return "Result: OK";
}
@PreDestroy

15
examples/chapter05/spring-bean-aop-demo/src/main/java/com/lk/demo/SecondBean.java Normal file
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@ -0,0 +1,15 @@
package com.lk.demo;
import org.springframework.context.annotation.Bean;
import org.springframework.stereotype.Component;
@Component
public class SecondBean {
public void doSomething(){
System.out.println("Second Bean do somting.");
}
public void doAnother(){
System.out.println("Second Bean do another.");
}
}