Spring Boot干货系列:(十一)数据存储篇-Spring
前言
上次介绍了Spring Boot中Mybatis的简单整合,本篇深入来结合通用Mapper、Mybatis Geneator以及分页PageHelper来打造适合企业开发的模板框架。
正文
项目框架还是跟上一篇一样使用Spring Boot的ace后端模板,不过最近在使用vue,所以前端引用了vue进来改写,代码变得更加简洁。
项目配置:
Spring Boot: 1.5.9.RELEASE
Maven: 3.5
Java: 1.8
Thymeleaf: 3.0.7.RELEASE
Vue.js: v2.5.11
数据源依赖
这里我们还是使用阿里巴巴的druid来当数据库连接池,发现这个有对应的监控界面,我们可以开启。
druid官方文档:https://github.com/alibaba/druid/wiki/常见问题
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.0.19</version>
</dependency>
对应的application.properties配置:
## 数据库访问配置
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.driver-class-name = com.mysql.jdbc.Driver
spring.datasource.url = jdbc:mysql://localhost:3306/spring?useUnicode=true&characterEncoding=utf-8
spring.datasource.username = root
spring.datasource.password = root
# 下面为连接池的补充设置,应用到上面所有数据源中
# 初始化大小,最小,最大
spring.datasource.initialSize=5
spring.datasource.minIdle=5
spring.datasource.maxActive=20
# 配置获取连接等待超时的时间
spring.datasource.maxWait=60000
# 配置间隔多久才进行一次检测,检测需要关闭的空闲连接,单位是毫秒
spring.datasource.timeBetweenEvictionRunsMillis=60000
# 配置一个连接在池中最小生存的时间,单位是毫秒
spring.datasource.minEvictableIdleTimeMillis=300000
spring.datasource.validationQuery=SELECT 1 FROM DUAL
spring.datasource.testWhileIdle=true
spring.datasource.testOnBorrow=false
spring.datasource.testOnReturn=false
# 打开PSCache,并且指定每个连接上PSCache的大小
spring.datasource.poolPreparedStatements=true
spring.datasource.maxPoolPreparedStatementPerConnectionSize=20
# 配置监控统计拦截的filters,去掉后监控界面sql无法统计,'wall'用于防火墙
spring.datasource.filters=stat,wall,log4j
# 合并多个DruidDataSource的监控数据
#spring.datasource.useGlobalDataSourceStat=true
对应的bean配置:
package com.dudu.config;
/**
* Druid配置
*
* @author dudu
* @date 2017-12-11 0:00
*/
@Configuration
public class DruidConfig {
private Logger logger = LoggerFactory.getLogger(DruidConfig.class);
@Value("${spring.datasource.url:#{null}}")
private String dbUrl;
@Value("${spring.datasource.username: #{null}}")
private String username;
@Value("${spring.datasource.password:#{null}}")
private String password;
@Value("${spring.datasource.driverClassName:#{null}}")
private String driverClassName;
@Value("${spring.datasource.initialSize:#{null}}")
private Integer initialSize;
@Value("${spring.datasource.minIdle:#{null}}")
private Integer minIdle;
@Value("${spring.datasource.maxActive:#{null}}")
private Integer maxActive;
@Value("${spring.datasource.maxWait:#{null}}")
private Integer maxWait;
@Value("${spring.datasource.timeBetweenEvictionRunsMillis:#{null}}")
private Integer timeBetweenEvictionRunsMillis;
@Value("${spring.datasource.minEvictableIdleTimeMillis:#{null}}")
private Integer minEvictableIdleTimeMillis;
@Value("${spring.datasource.validationQuery:#{null}}")
private String validationQuery;
@Value("${spring.datasource.testWhileIdle:#{null}}")
private Boolean testWhileIdle;
@Value("${spring.datasource.testOnBorrow:#{null}}")
private Boolean testOnBorrow;
@Value("${spring.datasource.testOnReturn:#{null}}")
private Boolean testOnReturn;
@Value("${spring.datasource.poolPreparedStatements:#{null}}")
private Boolean poolPreparedStatements;
@Value("${spring.datasource.maxPoolPreparedStatementPerConnectionSize:#{null}}")
private Integer maxPoolPreparedStatementPerConnectionSize;
@Value("${spring.datasource.filters:#{null}}")
private String filters;
@Value("{spring.datasource.connectionProperties:#{null}}")
private String connectionProperties;
@Bean
@Primary
public DataSource dataSource(){
DruidDataSource datasource = new DruidDataSource();
datasource.setUrl(this.dbUrl);
datasource.setUsername(username);
datasource.setPassword(password);
datasource.setDriverClassName(driverClassName);
//configuration
if(initialSize != null) {
datasource.setInitialSize(initialSize);
}
if(minIdle != null) {
datasource.setMinIdle(minIdle);
}
if(maxActive != null) {
datasource.setMaxActive(maxActive);
}
if(maxWait != null) {
datasource.setMaxWait(maxWait);
}
if(timeBetweenEvictionRunsMillis != null) {
datasource.setTimeBetweenEvictionRunsMillis(timeBetweenEvictionRunsMillis);
}
if(minEvictableIdleTimeMillis != null) {
datasource.setMinEvictableIdleTimeMillis(minEvictableIdleTimeMillis);
}
if(validationQuery!=null) {
datasource.setValidationQuery(validationQuery);
}
if(testWhileIdle != null) {
datasource.setTestWhileIdle(testWhileIdle);
}
if(testOnBorrow != null) {
datasource.setTestOnBorrow(testOnBorrow);
}
if(testOnReturn != null) {
datasource.setTestOnReturn(testOnReturn);
}
if(poolPreparedStatements != null) {
datasource.setPoolPreparedStatements(poolPreparedStatements);
}
if(maxPoolPreparedStatementPerConnectionSize != null) {
datasource.setMaxPoolPreparedStatementPerConnectionSize(maxPoolPreparedStatementPerConnectionSize);
}
if(connectionProperties != null) {
datasource.setConnectionProperties(connectionProperties);
}
List<Filter> filters = new ArrayList<>();
filters.add(statFilter());
filters.add(wallFilter());
datasource.setProxyFilters(filters);
return datasource;
}
@Bean
public ServletRegistrationBean druidServlet() {
ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean(new StatViewServlet(), "/druid/*");
//控制台管理用户,加入下面2行 进入druid后台就需要登录
//servletRegistrationBean.addInitParameter("loginUsername", "admin");
//servletRegistrationBean.addInitParameter("loginPassword", "admin");
return servletRegistrationBean;
}
@Bean
public FilterRegistrationBean filterRegistrationBean() {
FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean();
filterRegistrationBean.setFilter(new WebStatFilter());
filterRegistrationBean.addUrlPatterns("/*");
filterRegistrationBean.addInitParameter("exclusions", "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*");
filterRegistrationBean.addInitParameter("profileEnable", "true");
return filterRegistrationBean;
}
@Bean
public StatFilter statFilter(){
StatFilter statFilter = new StatFilter();
statFilter.setLogSlowSql(true); //slowSqlMillis用来配置SQL慢的标准,执行时间超过slowSqlMillis的就是慢。
statFilter.setMergeSql(true); //SQL合并配置
statFilter.setSlowSqlMillis(1000);//slowSqlMillis的缺省值为3000,也就是3秒。
return statFilter;
}
@Bean
public WallFilter wallFilter(){
WallFilter wallFilter = new WallFilter();
//允许执行多条SQL
WallConfig config = new WallConfig();
config.setMultiStatementAllow(true);
wallFilter.setConfig(config);
return wallFilter;
}
}
mybatis相关依赖
<!--mybatis-->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.3.1</version>
</dependency>
<!--通用mapper-->
<dependency>
<groupId>tk.mybatis</groupId>
<artifactId>mapper-spring-boot-starter</artifactId>
<version>1.1.5</version>
</dependency>
<!--pagehelper 分页插件-->
<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper-spring-boot-starter</artifactId>
<version>1.2.3</version>
</dependency>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
<plugin>
<groupId>org.mybatis.generator</groupId>
<artifactId>mybatis-generator-maven-plugin</artifactId>
<version>1.3.5</version>
<dependencies>
<!--配置这个依赖主要是为了等下在配置mybatis-generator.xml的时候可以不用配置classPathEntry这样的一个属性,避免代码的耦合度太高-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.44</version>
</dependency>
<dependency>
<groupId>tk.mybatis</groupId>
<artifactId>mapper</artifactId>
<version>3.4.0</version>
</dependency>
</dependencies>
<executions>
<execution>
<id>Generate MyBatis Artifacts</id>
<phase>package</phase>
<goals>
<goal>generate</goal>
</goals>
</execution>
</executions>
<configuration>
<!--允许移动生成的文件 -->
<verbose>true</verbose>
<!-- 是否覆盖 -->
<overwrite>true</overwrite>
<!-- 自动生成的配置 -->
<configurationFile>src/main/resources/mybatis-generator.xml</configurationFile>
</configuration>
</plugin>
</plugins>
</build>
上面引入了mybatis相关的一些依赖以及generator的配置,这里generator配置文件指向
src/main/resources/mybatis-generator.xml文件,具体一会贴出。
对应的application.properties配置:
#指定bean所在包
mybatis.type-aliases-package=com.dudu.domain
#指定映射文件
mybatis.mapperLocations=classpath:mapper/*.xml
#mapper
#mappers 多个接口时逗号隔开
mapper.mappers=com.dudu.util.MyMapper
mapper.not-empty=false
mapper.identity=MYSQL
#pagehelper
pagehelper.helperDialect=mysql
pagehelper.reasonable=true
pagehelper.supportMethodsArguments=true
pagehelper.params=count=countSql
通用Mapper配置
通用Mapper都可以极大的方便开发人员,对单表封装了许多通用方法,省掉自己写增删改查的sql。
通用Mapper插件网址:https://github.com/abel533/Mapper
package com.dudu.util;
import tk.mybatis.mapper.common.Mapper;
import tk.mybatis.mapper.common.MySqlMapper;
/**
* 继承自己的MyMapper
*
* @author
* @since 2017-06-26 21:53
*/
public interface MyMapper<T> extends Mapper<T>, MySqlMapper<T> {
//FIXME 特别注意,该接口不能被扫描到,否则会出错
}
这里实现一个自己的接口,继承通用的mapper,关键点就是这个接口不能被扫描到,不能跟dao这个存放mapper文件放在一起。
最后在启动类中通过MapperScan注解指定扫描的mapper路径:
package com.dudu;
@SpringBootApplication
//启注解事务管理
@EnableTransactionManagement // 启注解事务管理,等同于xml配置方式的 <tx:annotation-driven />
@MapperScan(basePackages = "com.dudu.dao", markerInterface = MyMapper.class)
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}
MyBatis Generator配置
这里配置一下上面提到的mybatis-generator.xml文件,该配置文件用来自动生成表对应的Model,Mapper以及xml,该文件位于src/main/resources
下面
Mybatis Geneator 详解: http://blog.csdn.net/isea533/article/details/42102297
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
"http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
<generatorConfiguration>
<!--加载配置文件,为下面读取数据库信息准备-->
<properties resource="application.properties"/>
<context id="Mysql" targetRuntime="MyBatis3Simple" defaultModelType="flat">
<plugin type="tk.mybatis.mapper.generator.MapperPlugin">
<property name="mappers" value="com.dudu.util.MyMapper" />
<!--caseSensitive默认false,当数据库表名区分大小写时,可以将该属性设置为true-->
<property name="caseSensitive" v
alue="true"/>
</plugin>
<!-- 阻止生成自动注释 -->
<commentGenerator>
<property name="javaFileEncoding" value="UTF-8"/>
<property name="suppressDate" value="true"/>
<property name="suppressAllComments" value="true"/>
</commentGenerator>
<!--数据库链接地址账号密码-->
<jdbcConnection driverClass="${spring.datasource.driver-class-name}"
connectionURL="${spring.datasource.url}"
userId="${spring.datasource.username}"
password="${spring.datasource.password}">
</jdbcConnection>
<javaTypeResolver>
<property name="forceBigDecimals" value="false"/>
</javaTypeResolver>
<!--生成Model类存放位置-->
<javaModelGenerator targetPackage="com.dudu.domain" targetProject="src/main/java">
<property name="enableSubPackages" value="true"/>
<property name="trimStrings" value="true"/>
</javaModelGenerator>
<!--生成映射文件存放位置-->
<sqlMapGenerator targetPackage="mapper" targetProject="src/main/resources">
<property name="enableSubPackages" value="true"/>
</sqlMapGenerator>
<!--生成Dao类存放位置-->
<!-- 客户端代码,生成易于使用的针对Model对象和XML配置文件 的代码
type="ANNOTATEDMAPPER",生成Java Model 和基于注解的Mapper对象
type="XMLMAPPER",生成SQLMap XML文件和独立的Mapper接口
-->
<javaClientGenerator type="XMLMAPPER" targetPackage="com.dudu.dao" targetProject="src/main/java">
<property name="enableSubPackages" value="true"/>
</javaClientGenerator>
<!--生成对应表及类名
去掉Mybatis Generator生成的一堆 example
-->
<table tableName="LEARN_RESOURCE" domainObjectName="LearnResource" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false">
<generatedKey column="id" sqlStatement="Mysql" identity="true"/>
</table>
</context>
</generatorConfiguration>
其中,我们通过<properties resource="application.properties"/>
引入了配置文件,这样下面指定数据源的时候不用写死。
其中tk.mybatis.mapper.generator.MapperPlugin很重要,用来指定通用Mapper对应的文件,这样我们生成的mapper都会继承这个通用Mapper
<plugin type="tk.mybatis.mapper.generator.MapperPlugin">
<property name="mappers" value="com.dudu.util.MyMapper" />
<!--caseSensitive默认false,当数据库表名区分大小写时,可以将该属性设置为true-->
<property name="caseSensitive" value="true"/>
</plugin>
这样就可以通过mybatis-generator插件生成对应的文件啦
image.png
如果不是IDEA开发环境也可以直接通过命令:mvn mybatis-generator:generate
自动生成的文件如下图所示
image.png
脚本初始化
CREATE DATABASE /*!32312 IF NOT EXISTS*/`spring` /*!40100 DEFAULT CHARACTER SET utf8 */;
USE `spring`;
DROP TABLE IF EXISTS `learn_resource`;
CREATE TABLE `learn_resource` (
`id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT 'ID',
`author` varchar(20) DEFAULT NULL COMMENT '作者',
`title` varchar(100) DEFAULT NULL COMMENT '描述',
`url` varchar(100) DEFAULT NULL COMMENT '地址链接',
PRIMARY KEY (`id`)
) ENGINE=MyISAM AUTO_INCREMENT=1029 DEFAULT CHARSET=utf8;
insert into `learn_resource`(`id`,`author`,`title`,`url`) values (999,'官方SpriongBoot例子','官方SpriongBoot例子','https://github.com/spring-projects/spring-boot/tree/master/spring-boot-samples');
insert into `learn_resource`(`id`,`author`,`title`,`url`) values (1000,'龙果学院','Spring Boot 教程系列学习','http://www.roncoo.com/article/detail/124661');
insert into `learn_resource`(`id`,`author`,`title`,`url`) values (1001,'嘟嘟MD独立博客','Spring Boot干货系列','http://tengj.top/');
insert into `learn_resource`(`id`,`author`,`title`,`url`) values (1002,'后端编程嘟','Spring Boot视频教程','http://www.toutiao.com/m1559096720023553/');
Controller层
到此为止,基本的配置结束了,我们开始实现业务的逻辑,Controller层代码如下
/** 教程页面
* Created by tengj on 2017/12/19
*/
@Controller
@RequestMapping("/learn")
public class LearnController extends AbstractController{
@Autowired
private LearnService learnService;
private Logger logger = LoggerFactory.getLogger(this.getClass());
@RequestMapping("")
public String learn(Model model){
model.addAttribute("ctx", getContextPath()+"/");
return "learn-resource";
}
/**
* 查询教程列表
* @param page
* @return
*/
@RequestMapping(value = "/queryLeanList",method = RequestMethod.POST)
@ResponseBody
public AjaxObject queryLearnList(Page<LeanQueryLeanListReq> page){
List<LearnResource> learnList=learnService.queryLearnResouceList(page);
PageInfo<LearnResource> pageInfo =new PageInfo<LearnResource>(learnList);
return AjaxObject.ok().put("page", pageInfo);
}
/**
* 新添教程
* @param learn
*/
@RequestMapping(value = "/add",method = RequestMethod.POST)
@ResponseBody
public AjaxObject addLearn(@RequestBody LearnResource learn){
learnService.save(learn);
return AjaxObject.ok();
}
/**
* 修改教程
* @param learn
*/
@RequestMapping(value = "/update",method = RequestMethod.POST)
@ResponseBody
public AjaxObject updateLearn(@RequestBody LearnResource learn){
learnService.updateNotNull(learn);
return AjaxObject.ok();
}
/**
* 删除教程
* @param ids
*/
@RequestMapping(value="/delete",method = RequestMethod.POST)
@ResponseBody
public AjaxObject deleteLearn(@RequestBody Long[] ids){
learnService.deleteBatch(ids);
return AjaxObject.ok();
}
}
通用Service
正常情况下具体业务是每个模块的service里面定义许多方法,然后mapper中实现。
但是博主查看插件文档后发现一个通用Mapper在Spring4中的最佳用法。那就是通用的Service。
具体可以查看这里了解:https://gitee.com/free/Mapper2/blob/master/wiki/mapper/4.Spring4.md
定义通用service接口
/**
* 通用接口
*/
@Service
public interface IService<T> {
T selectByKey(Object key);
int save(T entity);
int delete(Object key);
int updateAll(T entity);
int updateNotNull(T entity);
List<T> selectByExample(Object example);
//TODO 其他...
}
具体实现通用接口类
/**
* 通用Service
* @param <T>
*/
public abstract class BaseService<T> implements IService<T> {
@Autowired
protected Mapper<T> mapper;
public Mapper<T> getMapper() {
return mapper;
}
@Override
public T selectByKey(Object key) {
//说明:根据主键字段进行查询,方法参数必须包含完整的主键属性,查询条件使用等号
return mapper.selectByPrimaryKey(key);
}
@Override
public int save(T entity) {
//说明:保存一个实体,null的属性也会保存,不会使用数据库默认值
return mapper.insert(entity);
}
@Override
public int delete(Object key) {
//说明:根据主键字段进行删除,方法参数必须包含完整的主键属性
return mapper.deleteByPrimaryKey(key);
}
@Override
public int updateAll(T entity) {
//说明:根据主键更新实体全部字段,null值会被更新
return mapper.updateByPrimaryKey(entity);
}
@Override
public int updateNotNull(T entity) {
//根据主键更新属性不为null的值
return mapper.updateByPrimaryKeySelective(entity);
}
@Override
public List<T> selectByExample(Object example) {
//说明:根据Example条件进行查询
//重点:这个查询支持通过Example类指定查询列,通过selectProperties方法指定查询列
return mapper.selectByExample(example);
}
}
到此基本的增删改查通用service就写好了,具体业务的service就直接继承这个接口即可,也可以添加额外的方法,例如:
public interface LearnService extends IService<LearnResource>{
public List<LearnResource> queryLearnResouceList(Page<LeanQueryLeanListReq> page);
public void deleteBatch(Long[] ids);
}
具体实现service
/**
* Created by tengj on 2017/4/7.
*/
@Service
public class LearnServiceImpl extends BaseService<LearnResource> implements LearnService {
@Autowired
private LearnResourceMapper learnResourceMapper;
@Override
public void deleteBatch(Long[] ids) {
Arrays.stream(ids).forEach(id->learnResourceMapper.deleteByPrimaryKey(id));
}
@Override
public List<LearnResource> queryLearnResouceList(Page<LeanQueryLeanListReq> page) {
PageHelper.startPage(page.getPage(), page.getRows());
return learnResourceMapper.queryLearnResouceList(page.getCondition());
}
}
可以看到,具体LearnServiceImpl这边就实现了2个方法,其他的都使用了通用service的,在开发上剩下了许多功夫。
Mapper相关
在自动生成的mapper文件中实现sevice自定义的方法:
public interface LearnResourceMapper extends MyMapper<LearnResource> {
List<LearnResource> queryLearnResouceList(Map<String,Object> map);
}
LearnResourceMapper.xml:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.dudu.dao.LearnResourceMapper">
<resultMap id="BaseResultMap" type="com.dudu.domain.LearnResource">
<!--
WARNING - @mbg.generated
-->
<id column="id" jdbcType="BIGINT" property="id" />
<result column="author" jdbcType="VARCHAR" property="author" />
<result column="title" jdbcType="VARCHAR" property="title" />
<result column="url" jdbcType="VARCHAR" property="url" />
</resultMap>
<select id="queryLearnResouceList" resultType="com.dudu.domain.LearnResource">
SELECT * from learn_resource where 1=1
<if test="author != null and author!= ''">
and author like CONCAT('%',#{author},'%')
</if>
<if test="title != null and title!= ''">
and title like CONCAT('%',#{title},'%')
</if>
order by id desc
</select>
</mapper>
IDEA可以安装这个插件,这样就可以直接从Mapper文件跳转到xml了
image.png
image.png
最终项目效果如下,增删改查分页一个都不少:
image.png
上面提到druid有对应的监控界面,启动项目后输入http://localhost:8090/spring/druid 即可登录,界面效果如下
总结
到此,一套适合企业级开发的Spring Boot应用模板就好了,Mybatis+通用Mapper、Mybatis Geneator确实可以省下很多开发成本,提高效率。前端整合了vue.js,具体看源码。
想要查看更多Spring Boot干货教程,可前往:Spring Boot干货系列总纲
源码下载
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- chapter11==》Spring Boot干货系列:(十一)数据存储篇-Spring Boot整合Mybatis通用Mapper插件
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