目录
2.6.6 SwaggercurdApplication启动类
2.6.7 SwaggercurdApplicationTests
1.SpringBoot的自动装配原理
什么是自动装配?
无需手动加载某些配置，而由Springboot自动加载进来。
譬如: 自己加载DispatcherServlet.
如何完成自动装配?
为什么总的自动装配类由127个。因为这些自动装配类都在某个文件中写死了。
DispatcherServlet如何完成自动装配。
2.springboot整合数据源
即是: springboot框架连接数据库。
（1）引入依赖
<!--加入数据源的启动依赖: springboot启动时会加载对应的自动装配类。-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>（2）配置数据源信息---application.properties
# 配置数据源
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/mydb?serverTimezone=Asia/Shanghai
spring.datasource.username=root
spring.datasource.password=root(3)测试
//若是相同位置则无需使用启动类.class这一配置说明
@SpringBootTest(classes = 启动类.class)
class Qy151SpringbootApplicationTests {
@Resource
private DataSource dataSource;
@Test
public void test01() throws SQLException {
//验证了springboot可以帮你完成数据源的自动装配功能
System.out.println(dataSource.getConnection());
}
}上面默认这个数据源使用的连接池Hikari。如果不想使用默认的连接池，我们可以引入第三方的连接池。
2.1 集成druid数据源
（1）依赖
<!--引入数据库连接池druid-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
<version>1.2.8</version>
</dependency>（2）配置文件
spring.datasource.druid.url=jdbc:mysql://localhost:3306/mydb?serverTimezone=Asia/Shanghai
spring.datasource.druid.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.druid.username=root
spring.datasource.druid.password=root
#初始化的个数
spring.datasource.druid.initial-size=5
# 最大活跃数
spring.datasource.druid.max-active=10
# 最大等待时间
spring.datasource.druid.max-wait=3000
# 最小的闲置个数
spring.datasource.druid.min-idle=5(3)测试
@Resource
private DataSource dataSource;
@Test
public void test01() throws SQLException {
//验证了springboot可以帮你完成数据源的自动装配功能
System.out.println(dataSource);
System.out.println(dataSource.getConnection());
}3.springboot整合mybatis
(1)引入mybatis启动依赖类
<!--引入mybatis的启动依赖-->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.2.2</version>
</dependency>(2) 修改配置文件
#指定映射文件的路径
mybatis.mapper-locations=classpath:mapper/*.xml（3）在主启动类加上注解
@SpringBootApplication
@MapperScan(basePackages = "com.ykq.dao") //为指定的包下的接口生成代理实现类
public class Qy151SpringbootApplication {
public static void main(String[] args) {
//加载那含有@SpringBootApplication注解的类,它的特殊之处就是该类使用了@SpringBootApplication ，它是一个复合组件。
//@EnableAutoConfiguration
SpringApplication.run(Qy151SpringbootApplication.class, args);
}
}(4)测试
@Autowired
private DeptMapper deptMapper;
@Test
public void test02(){
System.out.println(deptMapper.findById(1));
}4.springboot整合PageHelper分页插件
（1）引入依赖
<!--pageHelper的启动依赖 自动装配拦截器-->
<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper-spring-boot-starter</artifactId>
<version>1.4.2</version>
</dependency>（2）测试:
@Test
public void test03(){
PageHelper.startPage(1, 3);
List<Dept> list = deptMapper.findAll();
PageInfo<Dept> pageInfo=new PageInfo<>(list);
System.out.println("当前页码:"+pageInfo.getPageNum());
System.out.println("当前总页码:"+pageInfo.getPages());
System.out.println("总条数:"+pageInfo.getTotal());
System.out.println("当前页码的记录:"+pageInfo.getList());
}5.springboot整合swagger2
什么是swagger2？
它是一个接口文档----用来前后端分离的一款文档。
（1）引入swagger依赖
<dependency>
<groupId>com.spring4all</groupId>
<artifactId>swagger-spring-boot-starter</artifactId>
<version>1.9.1.RELEASE</version>
</dependency>
<dependency>
<groupId>com.github.xiaoymin</groupId>
<artifactId>swagger-bootstrap-ui</artifactId>
<version>1.7.8</version>
</dependency>（2）创建swagger配置类
@Configuration
public class SwaggerConfig {
@Bean//swagger中所有的功能都封装在Docket类中
public Docket docket(){
Docket docket=new Docket(DocumentationType.SWAGGER_2)
.host("localhost:8888")
.apiInfo(apiInfo())//设置api文档信息
.select()
.apis(RequestHandlerSelectors.basePackage("com.qy151wd.springboot.controller"))
.build();
return docket;
}
//定义自己接口文档信息
private ApiInfo apiInfo(){
Contact DEFAULT_CONTACT = new Contact("小可", "http://www.baidu.com", "[email protected]");
ApiInfo apiInfo = new ApiInfo("wd的小项目", "适合小新手", "V1.0", "http://www.jd.com",
DEFAULT_CONTACT, "牛牛公司", "http://www.taobao.com", new ArrayList<VendorExtension>());
return apiInfo;
}
}（3）开启swagger注解
//@SpringBootApplication(scanBasePackageClasses = {"指定要扫的包"，“抛弃默认的扫包路径”})
@SpringBootApplication
@MapperScan(basePackages = "com.qy151wd.springboot.dao")//为指定的包下的接口生成代理实现类
@EnableSwagger2//开启swapper注解
public class SpringbootApplication {
//加载含有@SpringBootApplication注解的类
public static void main(String[] args) {
SpringApplication.run(SpringbootApplication.class, args);
}
}（4）使用swagger注解
@Api 接口类的注解---接口类上 tag属性
@ApiOperation 接口方法的注解---接口方法上 value:
@ApiImplicitParams( 接口参数的说明
{
ApiImplicitParam() //单个参数的说明
}
)@ApiModel---- 实体类接口注解
@ApiModelProperty---->实体类属性的说明
（5）访问
注意访问的是此处：
第一种: http://localhost:8888/swagger-ui.html
第二种: http://localhost:8888/doc.html
6.举一个栗子
关于一个数据库表的curd
6.1 结果展示
6.2 代码框架
6.3 各部分代码展示
6.3.1 SwaggerConfig类
@Configuration
public class SwaggerConfig {
@Bean
public Docket docket(){
Docket docket=new Docket(DocumentationType.SWAGGER_2)
.host("localhost:8888")
.apiInfo(apiInfo())
.select()
.apis(RequestHandlerSelectors.basePackage("com.qy151wd.controller"))
.build();
return docket;
}
private ApiInfo apiInfo(){
Contact DEFAULT_CONTACT = new Contact("孟一", "http://www.baidu.com", "[email protected]");
ApiInfo DEFAULT = new ApiInfo("wd的一个亿的小项目", "有梦想一起实现", "V1.0", "urn:tos",
DEFAULT_CONTACT, "牛牛公司", "http://www.taobao.com", new ArrayList<VendorExtension>());
return DEFAULT;
}
}6.3.2 controller层
@RestController
@Api(tags = "Dept对应的接口")
public class DeptController {
@Resource
private DeptMapper mapper;
@GetMapping("findById")
@ApiOperation(value = "通过Id查询")
public CommonResult findById(int id){
Dept byId = mapper.findById(id);
return new CommonResult(2000,"成功",byId);
}
@GetMapping("findAll")
@ApiOperation(value = "查询全部")
@ApiImplicitParams(
{
@ApiImplicitParam(name="pageNum",value = "页码",required = true,defaultValue = "1"),
@ApiImplicitParam(name="pageSize",value = "数据",required = true,defaultValue = "3"),
}
)
public CommonResult findAll(int pageNum,int pageSize){
PageHelper.startPage(1,3);
List<Dept> all = mapper.findAll();
PageInfo<Dept> pageInfo=new PageInfo<>(all);
return new CommonResult(2000,"成功",pageInfo);
}
@GetMapping("insert")
@ApiOperation(value = "添加元素")
public CommonResult insert(Dept dept){
int insert = mapper.insert(dept);
return new CommonResult(2000,"成功",insert);
}
@GetMapping("update")
@ApiOperation(value = "修改数据")
public CommonResult update(Dept dept){
int update = mapper.update(dept);
return new CommonResult(2000,"成功",update);
}
@GetMapping("deleteId")
@ApiOperation(value = "删除数据")
public CommonResult deleteId(int id){
int i = mapper.deleteId(id);
return new CommonResult(2000,"成功",i);
}
}6.3.3 dao包下
public interface DeptMapper {
public Dept findById(Integer id);
public List<Dept> findAll( );
public int insert(Dept dept);
public int update(Dept dept);
public int deleteId(Integer id);
}6.3.4 entity类
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Dept {
private Integer id;
private String name;
private String realname;
}6.3.5 CommonResulet类
@Data
@NoArgsConstructor
@AllArgsConstructor
@ApiModel(value = "统一的json数据")
public class CommonResult {
@ApiModelProperty(value = "状态码，2000代表正确，5000代表失败")
private Integer code;
@ApiModelProperty(value = "响应的信息内容")
private String msg;
@ApiModelProperty(value = "响应的数据")
private Object data;
}
2.6.6 SwaggercurdApplication启动类
@SpringBootApplication
@MapperScan(value = "com.qy151wd.dao")
@EnableSwagger2
public class SwaggercurdApplication {
public static void main(String[] args) {
SpringApplication.run(SwaggercurdApplication.class, args);
}
}
2.6.7 SwaggercurdApplicationTests
@SpringBootTest
class SwaggercurdApplicationTests {
@Test
void contextLoads() {
}
@Resource
private DeptMapper deptMapper;
@Test
public void findById(){
System.out.println(deptMapper.findById(7));
}
@Test
public void findAll(){
System.out.println(deptMapper.findAll());
}
@Test
public void insert(){
System.out.println(deptMapper.insert(new Dept(null, "轮滑社", "肖可可")));
}
@Test
public void update(){
System.out.println(deptMapper.update(new Dept(25, "社联部", null)));
}
@Test
public void delete(){
System.out.println(deptMapper.deleteId(26));
}
}2.6.8 mapper层下
<?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.qy151wd.dao.DeptMapper">
<sql id="resignDept">
id,name,realname
</sql>
<select id="findById" resultType="com.qy151wd.entity.Dept">
select <include refid="resignDept"/> from tb_dept where id=#{id}
</select>
<select id="findAll" resultType="com.qy151wd.entity.Dept">
select <include refid="resignDept"/> from tb_dept
</select>
<insert id="insert" parameterType="com.qy151wd.entity.Dept">
insert into tb_dept values (null,#{name},#{realname})
</insert>
<update id="update" parameterType="com.qy151wd.entity.Dept">
update tb_dept
<set>
<if test="name !=null and name !=''">
name=#{name},
</if>
<if test="realname !=null and realname !=''">
realname=#{realname}
</if>
</set>
where id=#{id}
</update>
<delete id="deleteId" parameterType="int">
delete from tb_dept where id=#{id}
</delete>
</mapper>