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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