EE顛覆者1-3章 spirng 基礎

1.pom

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>com.wisely</groupId>
	<artifactId>highlight_spring4</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<properties>
		<java.version>1.7</java.version>
		<spring-framework.version>4.1.5.RELEASE</spring-framework.version>
	</properties>
	<dependencies>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-context</artifactId>
			<version>${spring-framework.version}</version>
		</dependency>
		<!-- spring aop支持 -->
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-aop</artifactId>
			<version>${spring-framework.version}</version>
		</dependency>
		<!-- aspectj支持 -->
		<dependency>
			<groupId>org.aspectj</groupId>
			<artifactId>aspectjrt</artifactId>
			<version>1.8.6</version>
		</dependency>
		<dependency>
			<groupId>org.aspectj</groupId>
			<artifactId>aspectjweaver</artifactId>
			<version>1.8.5</version>
		</dependency>
		
		<!-- Spring test 支持 -->
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-test</artifactId>
			<version>${spring-framework.version}</version>
		</dependency>
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>4.11</version>
		</dependency>
		<dependency>
			<groupId>commons-io</groupId>
			<artifactId>commons-io</artifactId>
			<version>2.3</version>
		</dependency>

		<dependency>
			<groupId>javax.annotation</groupId>
			<artifactId>jsr250-api</artifactId>
			<version>1.0</version>
		</dependency>

		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-test</artifactId>
			<version>${spring-framework.version}</version>
		</dependency>
	</dependencies>
	<build>
		<plugins>
			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-compiler-plugin</artifactId>
				<version>2.3.2</version>
				<configuration>
					<source>${java.version}</source>
					<target>${java.version}</target>
				</configuration>
			</plugin>
		</plugins>
	</build>
</project>

AOP

1. 註解

@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface Action {
    String name();
}

使用註解

@Service
public class DemoAnnotationService {
	@Action(name="註解式攔截的add操作")
    public void add(){} 
   
}

方法

@Service
public class DemoMethodService {
	public void add(){}
}

2. 切面

@Aspect //1
@Component //2
public class LogAspect {
	
	@Pointcut("@annotation(com.wisely.highlight_spring4.ch1.aop.Action)") //3
	public void annotationPointCut(){};
	
	  @After("annotationPointCut()") //4
	    public void after(JoinPoint joinPoint) {
	        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
	        Method method = signature.getMethod();
	        Action action = method.getAnnotation(Action.class); 
	        System.out.println("註解式攔截 " + action.name()); //5
	    }
	  
	   @Before("execution(* com.wisely.highlight_spring4.ch1.aop.DemoMethodService.*(..))") //6
	    public void before(JoinPoint joinPoint){
	        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
	        Method method = signature.getMethod();
	        System.out.println("方法規則式攔截,"+method.getName());

	    }
	   
	  
	
}

3. 配置

@Configuration
@ComponentScan("com.wisely.highlight_spring4.ch1.aop")
@EnableAspectJAutoProxy //1
public class AopConfig {

}

	public static void main(String[] args) {
		 AnnotationConfigApplicationContext context =
	                new AnnotationConfigApplicationContext(AopConfig.class); //1
		 
		 DemoAnnotationService demoAnnotationService = context.getBean(DemoAnnotationService.class);
		 
		 DemoMethodService demoMethodService = context.getBean(DemoMethodService.class);
		 
		 demoAnnotationService.add();
		 
		 demoMethodService.add();
		 
		 context.close();
	}

DI

@Configuration //1
@ComponentScan("com.wisely.highlight_spring4.ch1.di") //2
public class DiConfig {

}

@Service //1
public class FunctionService {
	public String sayHello(String word){
		return "Hello " + word +" !"; 
	}

}

@Service //1
public class UseFunctionService {
	@Autowired //2
	FunctionService functionService;
	
	public String SayHello(String word){
		return functionService.sayHello(word);
	}

}

	public static void main(String[] args) {
		 AnnotationConfigApplicationContext context =
	                new AnnotationConfigApplicationContext(DiConfig.class); //1
		 
		 UseFunctionService useFunctionService = context.getBean(UseFunctionService.class); //2
		 
		 System.out.println(useFunctionService.SayHello("world"));
		 
		 context.close();
	}

javaconfig

public class FunctionService {
	
	public String sayHello(String word){
		return "Hello " + word +" !"; 
	}
}


public class UseFunctionService {
	//2
	FunctionService functionService;
	
	public void setFunctionService(FunctionService functionService) {
		this.functionService = functionService;
	}
	public String SayHello(String word){
		return functionService.sayHello(word);
	}

}


@Configuration //1
public class JavaConfig {
	@Bean //2
	public FunctionService functionService(){
		return new FunctionService();
	}
	
	@Bean 
	public UseFunctionService useFunctionService(){
		UseFunctionService useFunctionService = new UseFunctionService();
		useFunctionService.setFunctionService(functionService()); //3
		return useFunctionService;
		
	}
}



	public static void main(String[] args) {
		 AnnotationConfigApplicationContext context =
	                new AnnotationConfigApplicationContext(JavaConfig.class); 
		 
		 UseFunctionService useFunctionService = context.getBean(UseFunctionService.class); 
		 
		 System.out.println(useFunctionService.SayHello("java config"));
		 
		 context.close();
		
	}

scope

@Service
@Scope("prototype")//1
public class DemoPrototypeService {
}

@Service //1 
public class DemoSingletonService {

}

@Configuration
@ComponentScan("com.wisely.highlight_spring4.ch2.scope")
public class ScopeConfig {

}


	public static void main(String[] args) {
		AnnotationConfigApplicationContext context =
                new AnnotationConfigApplicationContext(ScopeConfig.class); 
		DemoSingletonService s1 = context.getBean(DemoSingletonService.class);
        DemoSingletonService s2 = context.getBean(DemoSingletonService.class);

        DemoPrototypeService p1 = context.getBean(DemoPrototypeService.class);
        DemoPrototypeService p2 = context.getBean(DemoPrototypeService.class);

        System.out.println("s1與s2是否相等："+s1.equals(s2));
        System.out.println("p1與p2是否相等："+p1.equals(p2));
        
        context.close();
	}

prototype

singleton 默認

request 給每個http request新建一個實例

session 給每個http session新建一個實例

globalsession 只在portal應用有用， 給每個global http session 新建一個實例

Spring El

@Service //get set
public class DemoService {
	@Value("其他類的屬性") //1
    private String another;
}



@Configuration
@ComponentScan("com.wisely.highlight_spring4.ch2.el")
//@PropertySource("classpath:/com/wisely/highlight_spring4/ch2/el/test.properties")//7
@PropertySource("classpath:test.properties") //最好還是這樣訪問
public class ElConfig {
	
	@Value("I Love You!") //1
    private String normal;

	@Value("#{systemProperties['os.name']}") //2
	private String osName;
	
	@Value("#{ T(java.lang.Math).random() * 100.0 }") //3
    private double randomNumber;

	@Value("#{demoService.another}") //4
	private String fromAnother;

	/*@Value("classpath:com/wisely/highlight_spring4/ch2/el/test.txt") //5*/
	@Value("classpath:test.txt")
	private Resource testFile;

	@Value("http://www.baidu.com") //6 
	private Resource testUrl;

	@Value("${book.name}") //7 
	private String bookName;

	@Autowired
	private Environment environment; //7
	
	@Bean //7
	public static PropertySourcesPlaceholderConfigurer propertyConfigure() {
		return new PropertySourcesPlaceholderConfigurer();
	}
	


	public void outputResource() {
		try {
			System.out.println(normal);
			System.out.println(osName);
			System.out.println(randomNumber);
			System.out.println(fromAnother);
			
			System.out.println(IOUtils.toString(testFile.getInputStream()));
			System.out.println(IOUtils.toString(testUrl.getInputStream()));
			System.out.println(bookName);
			System.out.println(environment.getProperty("book.author"));
		} catch (Exception e) {
			e.printStackTrace();
		}

	}

	
}


test.properties
book.author=wangyunfeidalao
book.name=spring boot
test.txt 文字隨便


	public static void main(String[] args) {
		 AnnotationConfigApplicationContext context =
	                new AnnotationConfigApplicationContext(ElConfig.class);
		 
		 ElConfig resourceService = context.getBean(ElConfig.class);
		 
		 resourceService.outputResource();
		 
		 context.close();
	}

bean的初始化與銷燬

1. java 配置
2. JSR-250註解 PostConstruct構造函數執行後後 ，PreDestroy 銷燬前

public class BeanWayService {
	  public void init(){
	        System.out.println("@Bean-init-method");
	    }
	    public BeanWayService() {
	        super();
	        System.out.println("初始化構造函數-BeanWayService");
	    }
	    public void destroy(){
	        System.out.println("@Bean-destory-method");
	    }
}




public class JSR250WayService {
	@PostConstruct //1
    public void init(){
        System.out.println("jsr250-init-method");
    }
    public JSR250WayService() {
        super();
        System.out.println("初始化構造函數-JSR250WayService");
    }
    @PreDestroy //2
    public void destroy(){
        System.out.println("jsr250-destory-method");
    }

}




@Configuration
@ComponentScan("com.wisely.highlight_spring4.ch2.prepost")
public class PrePostConfig {
	
	@Bean(initMethod="init",destroyMethod="destroy") //1
	BeanWayService beanWayService(){
		return new BeanWayService();
	}
	
	@Bean
	JSR250WayService jsr250WayService(){
		return new JSR250WayService();
	}

}


public class Main {
	
	public static void main(String[] args) {
		AnnotationConfigApplicationContext context =
                new AnnotationConfigApplicationContext(PrePostConfig.class);
		
		BeanWayService beanWayService = context.getBean(BeanWayService.class);
		JSR250WayService jsr250WayService = context.getBean(JSR250WayService.class);
		
		context.close();
	}

}

profile

public class DemoBean {

	private String content;

	public DemoBean(String content) {
		super();
		this.content = content;
	}
}


@Configuration
public class ProfileConfig {
	@Bean
	@Profile("dev") //1
	public DemoBean devDemoBean() {
		return new DemoBean("from development profile");
	}

	@Bean
	@Profile("prod") //2
	public DemoBean prodDemoBean() {
		return new DemoBean("from production profile");
	}

}



	public static void main(String[] args) {
		  AnnotationConfigApplicationContext context =  
				  new AnnotationConfigApplicationContext();
		  
		  context.getEnvironment().setActiveProfiles("prod"); //1
		  context.register(ProfileConfig.class);//2
		  context.refresh(); //3
		  
	      DemoBean demoBean = context.getBean(DemoBean.class);
	      
	      System.out.println(demoBean.getContent());
	      
	      context.close();
	}

事件

一個bean處理完一個任務之後，另一個bean知道並處理

1，自定義事件 ApplicationEvent
public class DemoEvent extends ApplicationEvent{
    private static final long serialVersionUID = 1L;
    private String msg;//get set

    public DemoEvent(Object source,String msg) {
        super(source);
        this.msg = msg;
    }
}

2，事件監聽器 ApplicationListener

@Component
public class DemoListener implements ApplicationListener<DemoEvent> {

	public void onApplicationEvent(DemoEvent event) {
		
		String msg = event.getMsg();
		
		System.out.println("我(bean-demoListener)接受到了bean-demoPublisher發佈的消息:"
				+ msg);

	}

}


3，事件發佈類
@Component
public class DemoPublisher {
	@Autowired
	ApplicationContext applicationContext;
	
	public void publish(String msg){
		applicationContext.publishEvent(new DemoEvent(this, msg));
	}

}


4，配置

@Configuration
@ComponentScan("com.wisely.highlight_spring4.ch2.event")
public class EventConfig {

}

5，運行
	public static void main(String[] args) {
		 AnnotationConfigApplicationContext context =
	                new AnnotationConfigApplicationContext(EventConfig.class);
		 
		 DemoPublisher demoPublisher = context.getBean(DemoPublisher.class);
		 
		 demoPublisher.publish("hello application event");
		 
		 context.close();
	}

第三章，spring高級話題，spring aware

讓 Bean獲得 Spring 容器的服務

@Service
public class AwareService implements BeanNameAware,ResourceLoaderAware{//1
	
	private String beanName;
	private ResourceLoader loader;
	
	@Override
	public void setResourceLoader(ResourceLoader resourceLoader) {//2
		this.loader = resourceLoader;
	}//重寫了資源加載器

	@Override
	public void setBeanName(String name) {//3
		this.beanName = name;
	}//重寫了 setBeanName
	
	public void outputResult(){
		System.out.println("Bean的名稱爲：" + beanName);
		
		Resource resource = 
				loader.getResource("classpath:test.txt");//com/wisely/highlight_spring4/ch3/aware/
		try{
			
			System.out.println("ResourceLoader加載的文件內容爲: " + IOUtils.toString(resource.getInputStream()));
			
		   }catch(IOException e){
			e.printStackTrace();
		   }
	
	}

}

@Configuration
@ComponentScan("com.wisely.highlight_spring4.ch3.aware")
public class AwareConfig {

}



public class Main {
	public static void main(String[] args) {
		
		AnnotationConfigApplicationContext context =
                new AnnotationConfigApplicationContext(AwareConfig.class);
		
		AwareService awareService = context.getBean(AwareService.class);
		awareService.outputResult();
		
		context.close();
	}
}

多線程

@Service
public class AsyncTaskService {
	
	@Async //1
    public void executeAsyncTask(Integer i){
        System.out.println("執行異步任務: "+i);
    }

    @Async
    public void executeAsyncTaskPlus(Integer i){
        System.out.println("執行異步任務+1: "+(i+1));
    }

}



@Configuration
@ComponentScan("com.wisely.highlight_spring4.ch3.taskexecutor")
@EnableAsync //1 
public class TaskExecutorConfig implements AsyncConfigurer{//2

	@Override
	public Executor getAsyncExecutor() {//2
		 ThreadPoolTaskExecutor taskExecutor = new ThreadPoolTaskExecutor();
	        taskExecutor.setCorePoolSize(5);
	        taskExecutor.setMaxPoolSize(10);
	        taskExecutor.setQueueCapacity(25);
	        taskExecutor.initialize();
	        return taskExecutor;
	}

	@Override
	public AsyncUncaughtExceptionHandler getAsyncUncaughtExceptionHandler() {
		return null;
	}

}


	public static void main(String[] args) {
		 AnnotationConfigApplicationContext context =
	                new AnnotationConfigApplicationContext(TaskExecutorConfig.class);
		 
		 AsyncTaskService asyncTaskService = context.getBean(AsyncTaskService.class);
		 
		 for(int i =0 ;i<10;i++){
			 asyncTaskService.executeAsyncTask(i);
			 asyncTaskService.executeAsyncTaskPlus(i);
	        }
	        context.close();
	}

計劃任務

@Service
public class ScheduledTaskService {
	
	  private static final SimpleDateFormat dateFormat = new SimpleDateFormat("HH:mm:ss");

	  @Scheduled(fixedRate = 5000) //1
	  public void reportCurrentTime() {
	       System.out.println("每隔五秒執行一次 " + dateFormat.format(new Date()));
	   }

	  @Scheduled(cron = "0 28 11 ? * *"  ) //2
	  public void fixTimeExecution(){
	      System.out.println("在指定時間 " + dateFormat.format(new Date())+"執行");
	  }

}


@Configuration
@ComponentScan("com.wisely.highlight_spring4.ch3.taskscheduler")
@EnableScheduling //1
public class TaskSchedulerConfig {

}


public class Main {
	public static void main(String[] args) {
		 AnnotationConfigApplicationContext context =
	                new AnnotationConfigApplicationContext(TaskSchedulerConfig.class);
		 
	}

}

條件註解

public class WindowsCondition implements Condition {

    public boolean matches(ConditionContext context,
            AnnotatedTypeMetadata metadata) {
        return context.getEnvironment().getProperty("os.name").contains("Windows");
    } //contains("Linux");

} 


public interface ListService {
	public String showListCmd();
}


public class WindowsListService implements ListService {

	@Override
	public String showListCmd() {
		return "dir";
	} // return "ls";
	

}


@Configuration
public class ConditionConifg {
	@Bean
    @Conditional(WindowsCondition.class) //1
    public ListService windowsListService() {
        return new WindowsListService();
    }

    @Bean
    @Conditional(LinuxCondition.class) //2
    public ListService linuxListService() {
        return new LinuxListService();
    }

}




	public static void main(String[] args) {
		AnnotationConfigApplicationContext context =
                new AnnotationConfigApplicationContext(ConditionConifg.class);
		
		ListService listService = context.getBean(ListService.class);
		
		
		System.out.println(context.getEnvironment().getProperty("os.name") 
				+ "系統下的列表命令爲: " 
				+ listService.showListCmd());
		
		context.close();
	}

組合註解

@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Configuration //1
@ComponentScan //2
public @interface WiselyConfiguration {
	
	String[] value() default {}; //3

}

//使用
@WiselyConfiguration("com.wisely.highlight_spring4.ch3.annotation")
public class DemoConfig {

}


@Service
public class DemoService {
	
	public void outputResult(){
		System.out.println("從組合註解配置照樣獲得的bean");
	}

}




	public static void main(String[] args) {
		AnnotationConfigApplicationContext context =
                new AnnotationConfigApplicationContext(DemoConfig.class);
		
		DemoService demoService =  context.getBean(DemoService.class);
		
		demoService.outputResult();
		
		context.close();
	}

測試

public class TestBean {
	private String content;

	public TestBean(String content) {
		super();
		this.content = content;
	}
} //get set


@Configuration
public class TestConfig {
	@Bean
	@Profile("dev")
	public TestBean devTestBean() {
		return new TestBean("from development profile");
	}

	@Bean
	@Profile("prod")
	public TestBean prodTestBean() {
		return new TestBean("from production profile");
	}

}



@RunWith(SpringJUnit4ClassRunner.class) //1
@ContextConfiguration(classes = {TestConfig.class}) //2
@ActiveProfiles("prod") //3
public class DemoBeanIntegrationTests {
	@Autowired //4
	private TestBean testBean;

	@Test //5
	public void prodBeanShouldInject(){
		String expected = "from production profile";
		String actual = testBean.getContent();
		Assert.assertEquals(expected, actual)
		;
	}

	
}