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!

test.txt

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+));
    }
}
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();
        taskExcutor.setMaxPoolSize();
        taskExcutor.setQueueCapacity();
        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=; i<; 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 = )
    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);
    }
}