关于Spring Boot你不得不知道的事--Spring Boot的基本操作

摘要：版本和编码方式依赖管理这样比如使用的时候就不需要指定版本号使用自己的项目这时候将依赖管理的问题放到中。

1 Pom文件
1.1 spring-boot-starter-parent
表示当前pom文件从spring-boot-starter-parent继承下来，在spring-boot-starter-parent中提供了很多默认配置，可以简化我们的开发。

org.springframework.boot
spring-boot-starter-parent
2.1.4.RELEASE
 

Java版本和编码方式

UTF-8
1.8
@
${java.version}
UTF-8
${java.version}

依赖管理spring-boot-dependencies

5.15.9
2.7.7
1.9.73
2.6.4
...

这样比如使用starter-web的时候就不需要指定版本号

org.springframework.boot
spring-boot-starter-web
2.1.4.RELEASE

使用自己的parent项目
这时候将依赖管理的问题放到dependencyManagement中。

官网说明文档见：13.2.2 Using Spring Boot without the Parent POM

  
     org.springframework.boot
     spring-boot-dependencies
     2.1.4.RELEASE
     pom
     import
  

1.2 打包管理
使用mvn package打包的plugin。

  
     org.springframework.boot
     spring-boot-maven-plugin
  

1.3 Starters
官网见：13.5 Starters

Starters are a set of convenient dependency descriptors that you can include in your application. You get a one-stop shop for all the Spring and related technologies that you need without having to hunt through sample code and copy-paste loads of dependency descriptors. For example, if you want to get started using Spring and JPA for database access, include the spring-boot-starter-data-jpa dependency in your project.
官方starter命名
spring-boot-starter-*

自定义starter命名
thirdpartyproject-spring-boot-starter

spring-boot-web-starter
查看其diagram，可以排除某个依赖

org.springframework.boot
spring-boot-starter-web

  
     org.springframework.boot
     spring-boot-starter-tomcat
  

2 XXXApplication
2.1 @SpringBootApplication
官网见：18. Using the @SpringBootApplication Annotation

等同于@EnableAutoConfiguration，@ComponentScan和@Configuration

2.2 SpringApplication.run
官网见：23. SpringApplication

3 配置文件
3.1 初步感受
server.port=9090
3.2 yml文件
application.yml

3.3 给属性注入值
实体类Person和IDCard
public class Person {

private String name;
private int age;
private Date birthday;
private String[] hobbies;
private IDCard idCard;
...

}
public class IDCard {

private int id;
private String number;

}
yml注入写法
person:

name: Jack
age: 17
birthday: 1997/06/01
hobbies: [code，sing，share]
idCard: 
    id: 1
    number: 111

Person类增加注解
@Component
@ConfigurationProperties(prefix="person")
测试
@Autowired
private Person person;
如果Person类上报错，在Pom文件中加入如下依赖

org.springframework.boot
spring-boot-configuration-processor

4 处理动静态资源
4.1 动态资源
官网见：90.2 Reload Templates without Restarting the Container

templates
resources目录下有一个templates文件夹，可以将动态资源放到其中

引入thymeleaf

org.springframework.boot
spring-boot-starter-thymeleaf

templates下新建test.html文件

controller中return test
@Controller
@RequestMapping("/gupao")
public class GupaoController {

@RequestMapping("/hello")
public String hello(Model model){
    String str="hello spring boot";
    //想要动态的显示在网页当中
    model.addAttribute("str",str);
    //接下来的页面是能够动态显示传过来的数据
    return "test";
}

}
4.2 静态资源
static文件夹
在resources目录下有一个static文件夹，可以将静态资源放到其中，浏览器可以直接访问。

静态资源其他存放文件夹
"classpath:/META-INF/resources/"
"classpath:/resources/"
"classpath:/static/"
"classpath:/public/"
WebMvcAutoConfiguration源码分析
WebMvcAutoConfiguration--->WebMvcAutoConfigurationAdapter.addResourceHandlers(xxx)--->

this.resourceProperties.getStaticLocations()
return this.staticLocations;
private String[] staticLocations = CLASSPATH_RESOURCE_LOCATIONS;
private static final String[] CLASSPATH_RESOURCE_LOCATIONS = {

  "classpath:/META-INF/resources/", "classpath:/resources/",
  "classpath:/static/", "classpath:/public/" };

自定义静态资源文件夹
观察

@ConfigurationProperties(prefix = "spring.resources", ignoreUnknownFields = false)
public class ResourceProperties {
配置application.properties

spring.resources.static-locations=classpath:/gupao/
5 整合MyBatis
5.1 需求
通过Spring Boot Web项目api接口的方式，整合MyBatis实现crud的操作。

5.2 创建Spring Boot Web项目
重温一下web项目创建的过程。

5.3 引入项目中需要的starter依赖

mysql
mysql-connector-java


org.mybatis.spring.boot
mybatis-spring-boot-starter
1.3.1


org.springframework.boot
spring-boot-starter-thymeleaf

5.4 创建数据库表
db_gupao_springboot--->t_user

5.5 创建domain/User对象
public class User {

private int id;
private String username;
private String password;
private String number;
...

}
5.6 开发dao层
@Repository
@Mapper
public interface UserMapper {

User find(String username);
List list();
int insert(User user);
int delete(int id);
int update(User user);

}
5.7 开发service层
@Service
public class UserService {

@Autowired
public UserMapper userMapper;
public User findByUsername(String username){
    return userMapper.find(username);
}
public List listUser(){
    return userMapper.list();
}
public int insertUser(User user){
    return userMapper.insert(user);
}
public int updateUser(User user){
    return userMapper.update(user);
}
public int delete(int id){
    return userMapper.delete(id);
}

}
5.8 开发controller层
@RestController
@RequestMapping(value="/user",method = {RequestMethod.GET,RequestMethod.POST})
public class UserController {

@Autowired
private UserService userService;
@RequestMapping("/listone")
@ResponseBody
public User listOne(String username){
    return userService.findByUsername(username);
}
@RequestMapping("/listall")
@ResponseBody
public List listAll(){
    return userService.listUser();
}

@RequestMapping(value="/add",method= RequestMethod.POST)
@ResponseBody
public String add(User user){
    int result=userService.insertUser(user);
    if(result>=1) {
        return "添加成功";
    }else{
        return "添加失败";
    }
}
@RequestMapping(value="/update",method= RequestMethod.POST)
@ResponseBody
public String update(User user){
    int result=userService.updateUser(user);
    if(result>=1) {
        return "修改成功";
    }else{
        return "修改失败";
    }
}
@RequestMapping(value="/delete",method= RequestMethod.GET)
@ResponseBody
public String delete(int id){
    int result=userService.delete(id);
    if(result>=1) {
        return "删除成功";
    }else{
        return "删除失败";
    }
}

}
5.9 resources目录下创建mapper文件夹---UserMapper.xml

    "-//mybatis.org//DTD com.example.Mapper 3.0//EN"
    "http://mybatis.org/dtd/mybatis-3-mapper.dtd">

    
    
    



  SELECT * FROM t_user where username=#{username}


  SELECT * FROM t_user


  INSERT INTO t_user
  (
  id,username,password,number
  )
  VALUES (
  #{id},
  #{username, jdbcType=VARCHAR},
  #{password, jdbcType=VARCHAR},
  #{number}
  )


  delete from t_user where id=#{id}


update t_user set user.username=#{username},user.password=#{password},user.number=#{number} where user.id=#{id}
   

5.10 application.properties文件配置
数据源
spring:
  datasource:
url: jdbc:mysql://127.0.0.1:3306/boot?useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTC
username: root
password: 123456
driver-class-name: com.mysql.cj.jdbc.Driver
mybatis托管mapper文件
mybatis:
  mapper-locations: classpath:mapper/*.xml
5.11 启动项目测试
查询
http://localhost:8888/user/listone?username=Jack
全部查询
http://localhost:8888/user/listall
增加
http://localhost:8888/user/add?id=3&username=AAA&password=111111&number=300
更新
http://localhost:8888/user/update?id=3&username=BBB
删除
http://localhost:8888/user/delete?id=3
6 项目打包
jar包
mvn -Dmaven.test.skip -U clean install
java -jar xxx.jar
war包
com.csdn
springboot-demo2
0.0.1-SNAPSHOT
war
7 Spring Boot in less than 10 minutes
https://www.youtube.com/watch...
BUILD ANYTHING WITH SPRING BOOT
Spring Boot is the starting point for building all Spring-based applications. Spring Boot is designed to get you up and running as quickly as possible, with minimal upfront configuration of Spring.

Get started in seconds using Spring Initializr
Build anything: REST API, WebSocket, web, streaming, tasks, and more
Simplified security
Rich support for SQL and NoSQL
Embedded runtime support: Tomcat, Jetty, and Undertow
Developer productivity tools such as LiveReload and Auto Restart
Curated dependencies that just work
Production-ready features such as tracing, metrics, and health status
Works in your favorite IDE: Spring Tool Suite, IntelliJ IDEA, and NetBeans

7.1 IDEA创建工程
group:com.example
artifact:bootiful
dependencies:Reactive Web,Reactive MongoDB,Lombok,Actuator,Security
7.2 DATA DRIVE
Spring Data integrates seamlessly with SQL and NoSQL persistence stores. Spring Data supports reactive data access,too!
@Component
class DataWriter implements ApplicationRunner {
private final CustomerRepository customerRepository;

DataWriter(CustomerRepository customerRepository) {
    this.customerRepository = customerRepository;
}

@Override
public void run(ApplicationArguments args) throws Exception {
    Flux.just("Jack", "Rechal", "Richard", "Jobs")
            .flatMap(name -> customerRepository.save(new Customer(null, name)))
            .subscribe(System.out::println);
}
}
interface CustomerRepository extends ReactiveMongoRepository {
}
@Document
@NoArgsConstructor
@Data
class Customer {
private String id,name;

public Customer(String id, String name) {
    this.id = id;
    this.name = name;
}
}
7.3 REST
On the web,nobody knows you"re a reactive microservice.
@SpringBootApplication
public class BootifulApplication {
@Bean
RouterFunction routes(CustomerRepository cr){
    return RouterFunctions.route(GET("/customers"),serverRequest -> ok().body(cr.findAll(),Customer.class));
}

public static void main(String[] args) {
    SpringApplication.run(BootifulApplication.class, args);
}

}
7.4 OBSERVABILITY
How"s your app"s health?Who better to articulate that then the application itself?
Spring Boot featurese strong opinions,loosely held.
It"s easy to change any of them with properties or pluggable implementations
management.endpoint.health.show-details=always
management.endpoints.web.exposure.exclude=*
@Bean
HealthIndicator healthIndicator(){
return () -> Health.status("I <3 Production").build();
}
访问:curl http://localhost:8080/actuator/health | jq
7.5 SECURITY
Effortlessly plugin authentication and authorization in a traditional or reactive application with Spring Security
@Bean
MapReactiveUserDetailsService users(){
return new MapReactiveUserDetailsService(User.withDefaultPasswordEncoder().username("user").password("pw").roles("USER").build());
}
访问:curl -vu user:pw http://localhost:8080/customers | jq
7.6 TO PRODUCTION
Let"s provision a MongoDB instance,configure our application"s route and MongoDB binding,and then push our application to production with Cloud Foundry.
命令切换到bootiful根目录下
cf services
定位到my-mongodb文件夹
复制对应文件，修改和观察