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

栏目: Java · 发布时间: 5年前

内容简介：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。

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。

<parent>

<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.4.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->

</parent>

Java版本和编码方式

<properties>

<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
<resource.delimiter>@</resource.delimiter>
<maven.compiler.source>${java.version}</maven.compiler.source>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.target>${java.version}</maven.compiler.target>

</properties>

依赖管理spring-boot-dependencies

<properties>

<activemq.version>5.15.9</activemq.version>
<antlr2.version>2.7.7</antlr2.version>
<appengine-sdk.version>1.9.73</appengine-sdk.version>
<artemis.version>2.6.4</artemis.version>
...

</properties>

这样比如使用starter-web的时候就不需要指定版本号

<dependency>

<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<version>2.1.4.RELEASE</version>

</dependency>

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

<dependencyManagement>

<dependencies>

<dependency>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-dependencies</artifactId>
     <version>2.1.4.RELEASE</version>
     <type>pom</type>
     <scope>import</scope>
  </dependency>

</dependencies>

</dependencyManagement>

1.2 打包管理

使用mvn package打包的plugin。

<build>

<plugins>

<plugin>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-maven-plugin</artifactId>
  </plugin>

</plugins>

</build>

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

<dependency>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-starter-web</artifactId>

<exclusions>

<exclusion>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-starter-tomcat</artifactId>
  </exclusion>

</exclusions>

</dependency>

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

<dependency>

<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-configuration-processor</artifactId>

</dependency>

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

<!--thymeleaf的jar包-->

<dependency>

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

</dependency>

templates下新建test.html文件

<html xmlns:th=" http://www.thymeleaf.org&quot ;>

<head>

</head>

<body>

<span style="color:red; font-size:30pt" th:text="${str}"></span>

</body>

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

<dependency>

<groupId>mysql</groupId>

<artifactId>mysql-connector-java</artifactId>

</dependency>

<dependency>

<groupId>org.mybatis.spring.boot</groupId>

<artifactId>mybatis-spring-boot-starter</artifactId>

<version>1.3.1</version>

</dependency>

<dependency>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-starter-thymeleaf</artifactId>

</dependency>

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<User> 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<User> 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<User> 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

<?xml version = "1.0" encoding = "UTF-8"?>

<!DOCTYPE mapper PUBLIC

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

<mapper namespace="com.csdn.springbootmybatis.dao.UserMapper">

<resultMap id="result" type="com.gupao.springbootmybatis.domain.User">
    <result property="username" column="username"/>
    <result property="password" column="password"/>
    <result property="number" column="number"/>
</resultMap>

<select id="find" resultMap="result">
  SELECT * FROM t_user where username=#{username}
</select>
<select id="list" resultMap="result">
  SELECT * FROM t_user

</select>

<insert id="insert" parameterType="com.gupao.springbootmybatis.domain.User"
        keyProperty="id" useGeneratedKeys="true">
  INSERT INTO t_user
  (
  id,username,password,number
  )
  VALUES (
  #{id},
  #{username, jdbcType=VARCHAR},
  #{password, jdbcType=VARCHAR},
  #{number}
  )

</insert>

<delete id="delete" parameterType="int">
  delete from t_user where id=#{id}

</delete>

<update id="update" parameterType="com.gupao.springbootmybatis.domain.User">

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

</update>

</mapper>

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

<groupId>com.csdn</groupId>

<artifactId>springboot-demo2</artifactId>

<version>0.0.1-SNAPSHOT</version>

<packaging>war</packaging>

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<Customer, String> {

}

@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<ServerResponse> 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

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

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

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

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


以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持 码农网

查看所有标签

猜你喜欢:

本站部分资源来源于网络，本站转载出于传递更多信息之目的，版权归原作者或者来源机构所有，如转载稿涉及版权问题，请联系我们。

码农书籍
编程之道

编程之道

杰弗雷﹒詹姆斯 / 清华大学出版社 / 1999-05 / 18.00元

本书出自美国一位善于进行哲学思考、有十多年工作经验的程序设计师——杰弗雷·詹姆斯之手，他以一种敏锐的眼光审视着发生在程序设计室里的各种各样的小故事，并利用古老的道家思想对其进行分析。简单的故事蕴含深奥的道理，是本书的最大特色。本书语言优美，比喻生动，可读性极强。一起来看看 《编程之道》 这本书的介绍吧!

码农工具
HTML 编码/解码
HTML 编码/解码

HTML 编码/解码

Base64 编码/解码
Base64 编码/解码

Base64 编码/解码

HEX CMYK 转换工具
HEX CMYK 转换工具

HEX CMYK 互转工具

  • New
  • 文章
  • 话题
  • 教程
    • 关注 码农网 公众号
    版权所有，保留一切权利！© 2018-2024 码农网 粤ICP备17054400号-3