SpringBoot 2.0入门（3）

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/u012124438/article/details/83090986

事物管理

1.Springboot整合事物管理
springboot默认集成事物,只主要在方法上加上@Transactional即可

2.SpringBoot分布式事物管理
使用springboot+jta+atomikos 分布式事物管理

2.1 新增配置文件信息

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

# Mysql 1
mysql.datasource.test.url = jdbc:mysql://localhost:3306/test01?useUnicode=true&characterEncoding=utf-8
mysql.datasource.test.username = root
mysql.datasource.test.password = root

mysql.datasource.test.minPoolSize = 3
mysql.datasource.test.maxPoolSize = 25
mysql.datasource.test.maxLifetime = 20000
mysql.datasource.test.borrowConnectionTimeout = 30
mysql.datasource.test.loginTimeout = 30
mysql.datasource.test.maintenanceInterval = 60
mysql.datasource.test.maxIdleTime = 60
mysql.datasource.test.testQuery = select 1


# Mysql 2
mysql.datasource.test2.url =jdbc:mysql://localhost:3306/test02?useUnicode=true&characterEncoding=utf-8
mysql.datasource.test2.username =root
mysql.datasource.test2.password =root

mysql.datasource.test2.minPoolSize = 3
mysql.datasource.test2.maxPoolSize = 25
mysql.datasource.test2.maxLifetime = 20000
mysql.datasource.test2.borrowConnectionTimeout = 30
mysql.datasource.test2.loginTimeout = 30
mysql.datasource.test2.maintenanceInterval = 60
mysql.datasource.test2.maxIdleTime = 60
mysql.datasource.test2.testQuery = select 1

2.2 读取配置文件信息

import org.springframework.boot.context.properties.ConfigurationProperties;

@ConfigurationProperties(prefix = "mysql.datasource.test")
public class DBConfig1 {

	private String url;
	private String username;
	private String password;
	private int minPoolSize;
	private int maxPoolSize;
	private int maxLifetime;
	private int borrowConnectionTimeout;
	private int loginTimeout;
	private int maintenanceInterval;
	private int maxIdleTime;
	private String testQuery;
}

import org.springframework.boot.context.properties.ConfigurationProperties;

@ConfigurationProperties(prefix = "mysql.datasource.test1")
public class DBConfig2 {

	private String url;
	private String username;
	private String password;
	private int minPoolSize;
	private int maxPoolSize;
	private int maxLifetime;
	private int borrowConnectionTimeout;
	private int loginTimeout;
	private int maintenanceInterval;
	private int maxIdleTime;
	private String testQuery;
}

2.3 创建多数据源

@Configuration
// basePackages 最好分开配置 如果放在同一个文件夹可能会报错
@MapperScan(basePackages = "com.itma.test1", sqlSessionTemplateRef = "testSqlSessionTemplate")
public class TestMyBatisConfig1 {

	// 配置数据源
	@Primary
	@Bean(name = "testDataSource")
	public DataSource testDataSource(DBConfig1 testConfig) throws SQLException {
		MysqlXADataSource mysqlXaDataSource = new MysqlXADataSource();
		mysqlXaDataSource.setUrl(testConfig.getUrl());
		mysqlXaDataSource.setPinGlobalTxToPhysicalConnection(true);
		mysqlXaDataSource.setPassword(testConfig.getPassword());
		mysqlXaDataSource.setUser(testConfig.getUsername());
		mysqlXaDataSource.setPinGlobalTxToPhysicalConnection(true);

		AtomikosDataSourceBean xaDataSource = new AtomikosDataSourceBean();
		xaDataSource.setXaDataSource(mysqlXaDataSource);
		xaDataSource.setUniqueResourceName("testDataSource");

		xaDataSource.setMinPoolSize(testConfig.getMinPoolSize());
		xaDataSource.setMaxPoolSize(testConfig.getMaxPoolSize());
		xaDataSource.setMaxLifetime(testConfig.getMaxLifetime());
		xaDataSource.setBorrowConnectionTimeout(testConfig.getBorrowConnectionTimeout());
		xaDataSource.setLoginTimeout(testConfig.getLoginTimeout());
		xaDataSource.setMaintenanceInterval(testConfig.getMaintenanceInterval());
		xaDataSource.setMaxIdleTime(testConfig.getMaxIdleTime());
		xaDataSource.setTestQuery(testConfig.getTestQuery());
		return xaDataSource;
	}

	@Primary
	@Bean(name = "testSqlSessionFactory")
	public SqlSessionFactory testSqlSessionFactory(@Qualifier("testDataSource") DataSource dataSource)
			throws Exception {
		SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
		bean.setDataSource(dataSource);
		return bean.getObject();
	}

	@Primary
	@Bean(name = "testSqlSessionTemplate")
	public SqlSessionTemplate testSqlSessionTemplate(
			@Qualifier("testSqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
		return new SqlSessionTemplate(sqlSessionFactory);
	}
}

// basePackages 最好分开配置 如果放在同一个文件夹可能会报错
@Configuration
@MapperScan(basePackages = "com.itma.test2", sqlSessionTemplateRef = "test2SqlSessionTemplate")
public class TestMyBatisConfig2 {

	// 配置数据源
	@Bean(name = "test2DataSource")
	public DataSource testDataSource(DBConfig1 testConfig) throws SQLException {
		MysqlXADataSource mysqlXaDataSource = new MysqlXADataSource();
		mysqlXaDataSource.setUrl(testConfig.getUrl());
		mysqlXaDataSource.setPinGlobalTxToPhysicalConnection(true);
		mysqlXaDataSource.setPassword(testConfig.getPassword());
		mysqlXaDataSource.setUser(testConfig.getUsername());
		mysqlXaDataSource.setPinGlobalTxToPhysicalConnection(true);

		AtomikosDataSourceBean xaDataSource = new AtomikosDataSourceBean();
		xaDataSource.setXaDataSource(mysqlXaDataSource);
		xaDataSource.setUniqueResourceName("test2DataSource");

		xaDataSource.setMinPoolSize(testConfig.getMinPoolSize());
		xaDataSource.setMaxPoolSize(testConfig.getMaxPoolSize());
		xaDataSource.setMaxLifetime(testConfig.getMaxLifetime());
		xaDataSource.setBorrowConnectionTimeout(testConfig.getBorrowConnectionTimeout());
		xaDataSource.setLoginTimeout(testConfig.getLoginTimeout());
		xaDataSource.setMaintenanceInterval(testConfig.getMaintenanceInterval());
		xaDataSource.setMaxIdleTime(testConfig.getMaxIdleTime());
		xaDataSource.setTestQuery(testConfig.getTestQuery());
		return xaDataSource;
	}

	@Bean(name = "test2SqlSessionFactory")
	public SqlSessionFactory testSqlSessionFactory(@Qualifier("test2DataSource") DataSource dataSource)
			throws Exception {
		SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
		bean.setDataSource(dataSource);
		return bean.getObject();
	}

	@Bean(name = "test2SqlSessionTemplate")
	public SqlSessionTemplate testSqlSessionTemplate(
			@Qualifier("test2SqlSessionFactory") SqlSessionFactory sqlSessionFactory) throws Exception {
		return new SqlSessionTemplate(sqlSessionFactory);
	}
}

2.4 启动加载配置

@EnableConfigurationProperties(value = { DBConfig1.class, DBConfig2.class })

日志管理

1.使用log4j记录日志
1.1新建log4j配置文件
文件名称log4j.properties

#log4j.rootLogger=CONSOLE,info,error,DEBUG
log4j.rootLogger=info,error,CONSOLE,DEBUG
log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender     
log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout     
log4j.appender.CONSOLE.layout.ConversionPattern=%d{yyyy-MM-dd-HH-mm} [%t] [%c] [%p] - %m%n     
log4j.logger.info=info
log4j.appender.info=org.apache.log4j.DailyRollingFileAppender
log4j.appender.info.layout=org.apache.log4j.PatternLayout     
log4j.appender.info.layout.ConversionPattern=%d{yyyy-MM-dd-HH-mm} [%t] [%c] [%p] - %m%n  
log4j.appender.info.datePattern='.'yyyy-MM-dd
log4j.appender.info.Threshold = info   
log4j.appender.info.append=true   
#log4j.appender.info.File=/home/admin/pms-api-services/logs/info/api_services_info
log4j.appender.info.File=/Users/dddd/Documents/testspace/pms-api-services/logs/info/api_services_info
log4j.logger.error=error  
log4j.appender.error=org.apache.log4j.DailyRollingFileAppender
log4j.appender.error.layout=org.apache.log4j.PatternLayout     
log4j.appender.error.layout.ConversionPattern=%d{yyyy-MM-dd-HH-mm} [%t] [%c] [%p] - %m%n  
log4j.appender.error.datePattern='.'yyyy-MM-dd
log4j.appender.error.Threshold = error   
log4j.appender.error.append=true   
#log4j.appender.error.File=/home/admin/pms-api-services/logs/error/api_services_error
log4j.appender.error.File=/Users/dddd/Documents/testspace/pms-api-services/logs/error/api_services_error
log4j.logger.DEBUG=DEBUG
log4j.appender.DEBUG=org.apache.log4j.DailyRollingFileAppender
log4j.appender.DEBUG.layout=org.apache.log4j.PatternLayout     
log4j.appender.DEBUG.layout.ConversionPattern=%d{yyyy-MM-dd-HH-mm} [%t] [%c] [%p] - %m%n  
log4j.appender.DEBUG.datePattern='.'yyyy-MM-dd
log4j.appender.DEBUG.Threshold = DEBUG   
log4j.appender.DEBUG.append=true   
#log4j.appender.DEBUG.File=/home/admin/pms-api-services/logs/debug/api_services_debug
log4j.appender.DEBUG.File=/Users/dddd/Documents/testspace/pms-api-services/logs/debug/api_services_debug

log4j代码

private static final Logger logger = LoggerFactory.getLogger(IndexController.class);

Maven依赖

<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.0.0.RELEASE</version>
	</parent>
	<dependencies>
		<!-- SpringBoot 核心组件 -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-tomcat</artifactId>
		</dependency>
		<dependency>
			<groupId>org.apache.tomcat.embed</groupId>
			<artifactId>tomcat-embed-jasper</artifactId>
		</dependency>
		<!-- spring boot start -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter</artifactId>
			<exclusions>
				<!-- 排除自带的logback依赖 -->
				<exclusion>
					<groupId>org.springframework.boot</groupId>
					<artifactId>spring-boot-starter-logging</artifactId>
				</exclusion>
			</exclusions>
		</dependency>

		<!-- springboot-log4j -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-log4j</artifactId>
			<version>1.3.8.RELEASE</version>
		</dependency>
	</dependencies>

2.使用AOP统一处理Web请求日志
2.1 POM文件新增依赖

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

2.2 POM文件新增依赖

@Aspect
@Component
public class WebLogAspect {

	private static final Logger logger = LoggerFactory.getLogger(WebLogAspect.class);

	@Pointcut("execution(public * com.itma.controller.*.*(..))")
	public void webLog() {
	}

	@Before("webLog()")
	public void doBefore(JoinPoint joinPoint) throws Throwable {
		// 接收到请求，记录请求内容
		ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
		HttpServletRequest request = attributes.getRequest();
		// 记录下请求内容
		logger.info("URL : " + request.getRequestURL().toString());
		logger.info("HTTP_METHOD : " + request.getMethod());
		logger.info("IP : " + request.getRemoteAddr());
		Enumeration<String> enu = request.getParameterNames();
		while (enu.hasMoreElements()) {
			String name = (String) enu.nextElement();
			logger.info("name:{},value:{}", name, request.getParameter(name));
		}
	}

	@AfterReturning(returning = "ret", pointcut = "webLog()")
	public void doAfterReturning(Object ret) throws Throwable {
		// 处理完请求，返回内容
		logger.info("RESPONSE : " + ret);
	}
}

3.Spring Boot集成lombok让代码更简洁
3.1 添加lombok依赖

<dependency>
	<groupId>org.projectlombok</groupId>
	<artifactId>lombok</artifactId>
</dependency>

3.2 实体类演示

@Slf4j
@Data
public class UserEntity {
	// @Getter
	// @Setter
	private String userName;
	// @Getter
	// @Setter
	private Integer age;

	@Override
	public String toString() {
		return "UserEntity [userName=" + userName + ", age=" + age + "]";
	}

	public static void main(String[] args) {
		UserEntity userEntity = new UserEntity();
		userEntity.setUserName("zhangsan");
		userEntity.setAge(20);
		System.out.println(userEntity.toString());
		log.info("####我是日志##########");
	}

}

其他特性

@Data 标签，生成getter/setter toString()等方法 
@NonNull : 让你不在担忧并且爱上NullPointerException 
@CleanUp : 自动资源管理：不用再在finally中添加资源的close方法 
@Setter/@Getter : 自动生成set和get方法 
@ToString : 自动生成toString方法 
@EqualsAndHashcode : 从对象的字段中生成hashCode和equals的实现 
@NoArgsConstructor/@RequiredArgsConstructor/@AllArgsConstructor 
自动生成构造方法 
@Data : 自动生成set/get方法，toString方法，equals方法，hashCode方法，不带参数的构造方法 
@Value : 用于注解final类 
@Builder : 产生复杂的构建器api类
@SneakyThrows : 异常处理（谨慎使用） 
@Synchronized : 同步方法安全的转化 
@Getter(lazy=true) : 
@Log : 支持各种logger对象，使用时用对应的注解，如：@Log4

4.缓存支持
4.1 注解配置与EhCache使用
4.1.1 pom文件引入

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

4.1.2 新建ehcache.xml 文件

<?xml version="1.0" encoding="UTF-8"?>
<ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:noNamespaceSchemaLocation="http://ehcache.org/ehcache.xsd"
	updateCheck="false">
	<diskStore path="java.io.tmpdir/Tmp_EhCache" />

	<!-- 默认配置 -->
	<defaultCache maxElementsInMemory="5000" eternal="false"
		timeToIdleSeconds="120" timeToLiveSeconds="120"
		memoryStoreEvictionPolicy="LRU" overflowToDisk="false" />

	<cache name="baseCache" maxElementsInMemory="10000"
		maxElementsOnDisk="100000" />

</ehcache>

配置信息介绍

<!--  
2.	       name:缓存名称。  
3.	       maxElementsInMemory：缓存最大个数。  
4.	       eternal:对象是否永久有效，一但设置了，timeout将不起作用。  
5.	       timeToIdleSeconds：设置对象在失效前的允许闲置时间（单位：秒）。仅当eternal=false对象不是永久有效时使用，可选属性，默认值是0，也就是可闲置时间无穷大。  
6.	       timeToLiveSeconds：设置对象在失效前允许存活时间（单位：秒）。最大时间介于创建时间和失效时间之间。仅当eternal=false对象不是永久有效时使用，默认是0.，也就是对象存活时间无穷大。  
7.	       overflowToDisk：当内存中对象数量达到maxElementsInMemory时，Ehcache将会对象写到磁盘中。  
8.	       diskSpoolBufferSizeMB：这个参数设置DiskStore（磁盘缓存）的缓存区大小。默认是30MB。每个Cache都应该有自己的一个缓冲区。  
9.	       maxElementsOnDisk：硬盘最大缓存个数。  
10.	       diskPersistent：是否缓存虚拟机重启期数据 Whether the disk store persists between restarts of the Virtual Machine. The default value is false.  
11.	       diskExpiryThreadIntervalSeconds：磁盘失效线程运行时间间隔，默认是120秒。  
12.	       memoryStoreEvictionPolicy：当达到maxElementsInMemory限制时，Ehcache将会根据指定的策略去清理内存。默认策略是LRU（最近最少使用）。你可以设置为FIFO（先进先出）或是LFU（较少使用）。  
13.	       clearOnFlush：内存数量最大时是否清除。  
14.	    --> 

4.1.3 代码使用Cacheable

@CacheConfig(cacheNames = "baseCache")
public interface UserMapper {
	@Select("select * from users where name=#{name}")
	@Cacheable
	UserEntity findName(@Param("name") String name);
}

4.1.4 清除缓存

@Autowired
private CacheManager cacheManager;
@RequestMapping("/remoKey")
public void remoKey() {
	cacheManager.getCache("baseCache").clear();
}

4.1.5 启动加入缓存
@EnableCaching // 开启缓存注解