关于java:java项目之路-一Spring-boot项目搭建

1:可能产生的erorr –pom.xml文件中,引入springboot父依赖时,文件报错:

--解决方案:清空.m2/repository下的所有依赖文件,从新下载即可

2:springboot集成mybatis,倡议应用xml文件治理sql语句。

dependencies如下:
    mysql:
        
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
</dependency>
mybatis:
<dependency>
    <groupId>org.mybatis.spring.boot</groupId>
    <artifactId>mybatis-spring-boot-starter</artifactId>
    <version>1.2.0</version>
</dependency>

编写applicastion.yml文件:

    spring:
        datasource:
            type: com.alibaba.druid.pool.DruidDataSource
            url: jdbc:mysql://127.0.0.1:3306/person?useUnicode=true&characterEncoding=utf-8
            username: root
            password:
            driver-class-name: com.mysql.jdbc.Driver
    mybatis:
        mapper-locations: classpath:mapper/*.xml
        type-aliases-package: com.example.demo.model
        configuration:
            cache-enabled: true
            lazy-loading-enabled: false
            aggressive-lazy-loading: true
            multiple-result-sets-enabled: true
            map-underscore-to-camel-case: true
            auto-mapping-behavior: full
            use-column-label: true
            use-generated-keys: false
            default-executor-type: simple
            default-statement-timeout: 25000
    server:
        port: 8080

3:mapper接口可应用注解@Mapper,也能够采纳主动扫描机制在入口类应用@MapperScan(“com.example.demo.dao”)来注解(举荐应用)
主动扫描mapper接口能够不增加注解(idea中,mapper接口不应用注解的话,应用@Autowired注解是飘红,并不影响应用,
有强迫症的童鞋能够在mapper接口应用@Repository或者@Resouse注解)

4:springboot热部署:两种形式(能够防止如论代码改变多少都须要频繁重启服务)

1):增加dependency:
    
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-devtools</artifactId>
    <optional>true</optional>
</dependency>
2):应用视图渲染(例如:freemarker,Thymeleaf)
    freemarker 设置形式
    
spring:
  freemarker:
    cache: false
    
    Thymeleaf 设置形式:
    
spring: 
  thymeleaf:
    cache: false 

5:springboot整合freemarker:

增加dependency:    
    
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-devtools</artifactId>
    <optional>true</optional>
</dependency>

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-freemarker</artifactId>
</dependency>
编写application.yml文件:
    
spring:
  freemarker:
    cache: false  

6:springboot整合Thymeleaf:

增加dependency:
    
<dependency>
    <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-thymeleaf</artifactId>
    </dependency>
编写application.yml配置文件
    
spring:
  thymeleaf:
    cache: false
    mode: HTML5

7:springboot整合redis:

增加dependency:
    
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.session</groupId>
    <artifactId>spring-session</artifactId>
</dependency>
配置文件application.yml编写
    
spring:
 redis:
    host: 192.168.44.129
    password: admin
  session:
    store-type: none
可能报错:JedisDataException
起因:未设置redis明码
相干命令:
    config get requirepass: 这是查问redis是否配置明码,如果返回为空,则表明未配置明码。 
    config set requirepass “admin”这是将redis的明码设置为“admin”

8:SpringBoot集成Redis音讯订阅公布

 
1)创立一个Redis音讯接收器
    
package cn.tyrone.springboot.redis.message;

import java.util.concurrent.CountDownLatch;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;

public class Receiver {
    private static final Logger LOGGER = LoggerFactory.getLogger(Receiver.class);

    private CountDownLatch latch;

    @Autowired
    public Receiver(CountDownLatch latch) {
        this.latch = latch;
    }

    public void receiveMessage(String message) {
        LOGGER.info("Received <" + message + ">");
        latch.countDown();
    }
}
2)注册一个监听器并发送音讯
    
package cn.tyrone.springboot.redis.message;

import java.util.concurrent.CountDownLatch;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.listener.PatternTopic;
import org.springframework.data.redis.listener.RedisMessageListenerContainer;
import org.springframework.data.redis.listener.adapter.MessageListenerAdapter;

//https://spring.io/guides/gs/messaging-redis/

@SpringBootApplication
public class Application {
    public static final Logger LOGGER = LoggerFactory.getLogger(Application.class);

    /*
     * Redis音讯监听器容器
     * 这个容器加载了RedisConnectionFactory和音讯监听器
     */
    @Bean
    RedisMessageListenerContainer container(RedisConnectionFactory connectionFactory, 
            MessageListenerAdapter listenerAdapter){
        RedisMessageListenerContainer container = new RedisMessageListenerContainer();
        container.setConnectionFactory(connectionFactory);
        container.addMessageListener(listenerAdapter, new PatternTopic("sprinboot-redis-messaage"));
        return container;
    }

    /*
     * 将Receiver注册为一个音讯监听器,并指定音讯接管的办法(receiveMessage)
     * 如果不指定音讯接管的办法,音讯监听器会默认的寻找Receiver中的handleMessage这个办法作为音讯接管的办法
     */
    @Bean
    MessageListenerAdapter listenerAdapter(Receiver receiver){
        return new MessageListenerAdapter(receiver, "receiveMessage");
    }

    /*
     * Receiver实例
     */
    @Bean
    Receiver receiver(CountDownLatch latch){
        return new Receiver(latch);
    }

    @Bean
    CountDownLatch latch(){
        return new CountDownLatch(1);
    }

    /*
     * Redis Template 用来发送音讯
     */
    @Bean
    StringRedisTemplate template(RedisConnectionFactory connectionFactory){
        return new StringRedisTemplate(connectionFactory);
    }

    /*
     * 测试用例
     */
    public static void main(String[] args) throws Exception {
        ApplicationContext ctx = SpringApplication.run(Application.class, args);

        StringRedisTemplate template = ctx.getBean(StringRedisTemplate.class);
//      CountDownLatch latch = ctx.getBean(CountDownLatch.class);

        LOGGER.info("Sending message......");
        template.convertAndSend("sprinboot-redis-messaage", "Hello, SpringBoot redis message!!!!");
//      latch.wait();

        System.exit(0);

    }

}
    对于本例并不非常分明CountDownLatch latch这个的目标,在测试的过程中,加上这句代码,会抛一个异样,然而发送和接管音讯都是胜利的。
    如果将此代码正文掉,该异样也将隐没。同时,也并不影响音讯的公布与接管。
    CountDownLatch只是一个同步的辅助类,测试过程中,并没有发现这个类对测试后果的有什么帮忙。

9:SpringBoot 整合 Apache ActiveMQ

装置ActiveMQ:
    间接去官网(http://activemq.apache.org/)下载最新版本即可,因为这是免装置的,只须要解压就行了。
    装置完之后进入bin目录,双击 activemq.bat文件(linux下在bin目录下执行 activemq start)
    在浏览器输出:http://ip:8161/admin/,呈现如下界面示意启动胜利 
    61616为对外服务端口号 
    8161为控制器端口号 
    当端口号抵触时,能够批改这两个端口号。cd conf ,批改activemq.xml 批改外面的61616端口。批改jetty.xml,批改外面的8161端口。
    
1)增加dependency:
    
    
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-activemq</artifactId>
</dependency>
2)编写application:
    
spring:
  activemq:
    broker-url: tcp://localhost:61616
    user: admin
    password: admin
        
删除不流动队列:
个别状况下,ActiveMQ的queue或者topic在不应用之后,能够通过web控制台来删除掉。当然,也能够通过配置,
使得broker能够主动探测到无用的队列(肯定工夫内为空的队列)并删除掉,回收响应资源。 
activemq.xml

<broker xmlns="http://activemq.apache.org/schema/core" brokerName="localhost" dataDirectory="${activemq.base}/data" destroyApplicationContextOnStop="true" schedulePeriodForDestinationPurge="10000">
    <destinationPolicy>
        <policyMap>
          <policyEntries>
            <policyEntry topic=">" gcInactiveDestinations="true" inactiveTimoutBeforeGC="100000" memoryLimit="1mb">
              <pendingSubscriberPolicy>
                <vmCursor />
              </pendingSubscriberPolicy>
            </policyEntry>
            <policyEntry queue=">" gcInactiveDestinations="true" inactiveTimoutBeforeGC="100000" memoryLimit="1mb">
            </policyEntry>
          </policyEntries>
        </policyMap>
    </destinationPolicy>
</broker>

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