springboot学习章节代码-spring高级话题
1、Spring Aware（获取Spring容器的服务）
hi, i am guodaxia!
package com.zhen.highlights_spring4.ch3.aware; import org.apache.commons.io.IOUtils; import org.springframework.beans.factory.BeanNameAware; import org.springframework.context.ResourceLoaderAware; import org.springframework.core.io.Resource; import org.springframework.core.io.ResourceLoader; import org.springframework.stereotype.Service; import java.io.IOException; /** * @author zhen * @Date 2018/7/2 10:49 */ @Service("awareService") public class AwareService implements BeanNameAware, ResourceLoaderAware { private String beanName; private ResourceLoader resourceLoader; @Override public void setBeanName(String beanName) { this.beanName = beanName; } @Override public void setResourceLoader(ResourceLoader resourceLoader) { this.resourceLoader = resourceLoader; } public void outputResult(){ System.out.println("Bean的名称为：" + beanName); Resource resource = resourceLoader.getResource("classpath:/com/zhen/highlights_spring4/ch3/aware/test.txt"); try{ System.out.println("ResourceLoader加载的文件内容为：" + IOUtils.toString(resource.getInputStream())); }catch (IOException e){ e.printStackTrace(); } } } package com.zhen.highlights_spring4.ch3.aware; import org.springframework.context.annotation.ComponentScan; import org.springframework.context.annotation.Configuration; /** * @author zhen * @Date 2018/7/2 10:53 */ @Configuration @ComponentScan("com.zhen.highlights_spring4.ch3.aware") public class AwareConfig { } package com.zhen.highlights_spring4.ch3.aware; import org.springframework.context.annotation.AnnotationConfigApplicationContext; /** * @author zhen * @Date 2018/7/2 10:54 */ 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(); } }
2、多线程
package com.zhen.highlights_spring4.ch3.taskexecutor; import org.springframework.scheduling.annotation.Async; import org.springframework.stereotype.Service; /** * @author zhen * @Date 2018/7/2 11:02 */ @Service public class AsyncTaskService { @Async public void executeAsyncTask(Integer i){ System.out.println("执行异步任务：" + i); } @Async public void executeAsyncTaskPlus(Integer i){ System.out.println("执行异步任务+1：" + (i+1)); } } package com.zhen.highlights_spring4.ch3.taskexecutor; import org.springframework.aop.interceptor.AsyncUncaughtExceptionHandler; import org.springframework.context.annotation.ComponentScan; import org.springframework.context.annotation.Configuration; import org.springframework.scheduling.annotation.AsyncConfigurer; import org.springframework.scheduling.annotation.EnableAsync; import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor; import java.util.concurrent.Executor; /** * @author zhen * @Date 2018/7/2 10:57 */ @Configuration @ComponentScan("com.zhen.highlights_spring4.ch3.taskexecutor") @EnableAsync public class TaskExecutorConfig implements AsyncConfigurer { @Override public Executor getAsyncExecutor() { ThreadPoolTaskExecutor taskExcutor = new ThreadPoolTaskExecutor(); taskExcutor.setCorePoolSize(5); taskExcutor.setMaxPoolSize(10); taskExcutor.setQueueCapacity(25); taskExcutor.initialize(); return taskExcutor; } @Override public AsyncUncaughtExceptionHandler getAsyncUncaughtExceptionHandler() { return null; } } package com.zhen.highlights_spring4.ch3.taskexecutor; import org.springframework.context.annotation.AnnotationConfigApplicationContext; /** * @author zhen * @Date 2018/7/2 11:05 */ public class Main { 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(); } }
3、计划任务
package com.zhen.highlights_spring4.ch3.taskscheduler; import org.springframework.scheduling.annotation.Scheduled; import org.springframework.stereotype.Service; import java.text.SimpleDateFormat; import java.util.Date; /** * @author zhen * @Date 2018/7/2 14:59 */ @Service public class ScheduledTaskService { private static final SimpleDateFormat dateFormat = new SimpleDateFormat("HH:mm:ss"); @Scheduled(fixedRate = 5000) public void reportCurrentTime(){ System.out.println("每隔5秒执行一次 " + dateFormat.format(new Date())); } @Scheduled(cron = "0 16 15 ? * *") public void fixTimeExcution(){ System.out.println("在指定时间 " + dateFormat.format(new Date()) + "执行"); } } package com.zhen.highlights_spring4.ch3.taskscheduler; import org.springframework.context.annotation.ComponentScan; import org.springframework.context.annotation.Configuration; import org.springframework.scheduling.annotation.EnableScheduling; /** * @author zhen * @Date 2018/7/2 15:09 */ @Configuration @ComponentScan("com.zhen.highlights_spring4.ch3.taskscheduler") @EnableScheduling public class TaskSchedualerConfig { } package com.zhen.highlights_spring4.ch3.taskscheduler; import org.springframework.context.annotation.AnnotationConfigApplicationContext; /** * @author zhen * @Date 2018/7/2 15:10 */ public class Main { public static void main(String[] args) { AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(TaskSchedualerConfig.class); } }
4、条件注解
package com.zhen.highlights_spring4.ch3.conditional; /** * @author zhen * @Date 2018/7/2 15:32 */ public interface ListService { public String showListCmd(); } package com.zhen.highlights_spring4.ch3.conditional; /** * @author zhen * @Date 2018/7/2 15:32 */ public class WindowsListService implements ListService { @Override public String showListCmd() { return "dir"; } } package com.zhen.highlights_spring4.ch3.conditional; /** * @author zhen * @Date 2018/7/2 15:33 */ public class LinuxListService implements ListService { @Override public String showListCmd() { return "ls"; } } package com.zhen.highlights_spring4.ch3.conditional; import org.springframework.context.annotation.Condition; import org.springframework.context.annotation.ConditionContext; import org.springframework.core.type.AnnotatedTypeMetadata; /** * @author zhen * @Date 2018/7/2 15:21 */ public class WindowsCondition implements Condition { @Override public boolean matches(ConditionContext conditionContext, AnnotatedTypeMetadata annotatedTypeMetadata) { return conditionContext.getEnvironment().getProperty("os.name").contains("Windows"); } } package com.zhen.highlights_spring4.ch3.conditional; import org.springframework.context.annotation.Condition; import org.springframework.context.annotation.ConditionContext; import org.springframework.core.type.AnnotatedTypeMetadata; /** * @author zhen * @Date 2018/7/2 15:21 */ public class LinuxCondition implements Condition { @Override public boolean matches(ConditionContext conditionContext, AnnotatedTypeMetadata annotatedTypeMetadata) { return conditionContext.getEnvironment().getProperty("os.name").contains("Linux"); } } package com.zhen.highlights_spring4.ch3.conditional; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Conditional; import org.springframework.context.annotation.Configuration; /** * @author zhen * @Date 2018/7/2 15:33 */ @Configuration public class ConditionConfig { @Bean @Conditional(WindowsCondition.class) public ListService windowsListService(){ return new WindowsListService(); } @Bean @Conditional(LinuxCondition.class) public ListService linuxListService(){ return new LinuxListService(); } } package com.zhen.highlights_spring4.ch3.conditional; import org.springframework.context.annotation.AnnotationConfigApplicationContext; /** * @author zhen * @Date 2018/7/2 15:40 */ public class Main { public static void main(String[] args){ AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(ConditionConfig.class); ListService listService = context.getBean(ListService.class); System.out.println(context.getEnvironment().getProperty("os.name") + "系统下的列表命令为： " + listService.showListCmd()); context.close(); } }
5、组合注解
package com.zhen.highlights_spring4.ch3.annotation; import org.springframework.context.annotation.ComponentScan; import org.springframework.context.annotation.Configuration; import java.lang.annotation.*; /** * @author zhen * @Date 2018/7/2 15:48 */ @Target(ElementType.TYPE) @Retention(RetentionPolicy.RUNTIME) @Documented @Configuration @ComponentScan public @interface WiselyConfiguration { String[] value() default {}; } package com.zhen.highlights_spring4.ch3.annotation; /** * @author zhen * @Date 2018/7/2 16:00 */ @WiselyConfiguration("com.zhen.highlights_spring4.ch3.annotation") public class DemoConfig { } package com.zhen.highlights_spring4.ch3.annotation; import org.springframework.stereotype.Service; /** * @author zhen * @Date 2018/7/2 15:53 */ @Service public class DemoService { public void outputResult(){ System.out.println("从组合注解配置照样获得的bean"); } } package com.zhen.highlights_spring4.ch3.annotation; import org.springframework.context.annotation.AnnotationConfigApplicationContext; /** * @author zhen * @Date 2018/7/2 16:01 */ public class Main { public static void main(String[] args){ AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(DemoConfig.class); DemoService demoService = context.getBean(DemoService.class); demoService.outputResult(); context.close(); } }
6、测试
package com.zhen.highlights_spring4.ch3.fortest; /** * @author zhen * @Date 2018/7/2 16:04 */ public class TestBean { private String content; public TestBean(String content){ super(); this.content = content; } public String getContent() { return content; } public void setContent(String content) { this.content = content; } } package com.zhen.highlights_spring4.ch3.fortest; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.context.annotation.Profile; /** * @author zhen * @Date 2018/7/2 16:05 */ @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"); } } package com.zhen.highlights_spring4.ch3.fortest; import org.junit.Assert; import org.junit.Test; import org.junit.runner.RunWith; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.test.context.ActiveProfiles; import org.springframework.test.context.ContextConfiguration; import org.springframework.test.context.junit4.SpringJUnit4ClassRunner; /** * @author zhen * @Date 2018/7/2 16:30 */ @RunWith(SpringJUnit4ClassRunner.class) @ContextConfiguration(classes = {TestConfig.class}) @ActiveProfiles("prod") public class DemoBeanIntegrationTests { @Autowired private TestBean testBean; @Test public void prodBeanShouldInject(){ String expected = "from production profile"; String actual = testBean.getContent(); Assert.assertEquals(expected, actual); } }
