使用idea搭建springboot

参照https://blog.csdn.net/u013248535/article/details/55100979/

1.首先利用idea创建一个空的maven项目

空的maven项目结构如图

2.在pom.xml文件中引入springboot的必要依赖

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.cp</groupId>
    <artifactId>springboot-demo</artifactId>
    <version>1.0-SNAPSHOT</version>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.1.RELEASE</version>
    </parent>
    
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

</dependencies>

3.在名为java目录下创建controller文件夹，在controller文件夹下新建一个简单的测试类SampleController

@Controller
@EnableAutoConfiguration
public class SampleController {
@RequestMapping("/")
@ResponseBody
String home() {
return "Hello World!";
}

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

4 运行这个main函数，在浏览器上打开http://localhost:8080/ ,就会看到页面上打印出hello word!

与我之前所熟悉的ssm框架的启动模式不同的是，ssm框架需要安装tomcat,将项目的war包放到tomcat上，启动tomcat服务器才可以完成部署。springboot的框架，他有一个入口main函数，在main函数中调用SpringApplication的run（）方法，这个方法中应该集成了tomcat,将tomcat作为插件融入，使用户以最原始的java执行的方法（main方法）启动项目

5 在上面的基础上搭建简单的mvc的web应用

在java包下创建entity、repository、service文件夹分别存放实体类、Dao层实体方法接口和业务层实现类

entity：

@Entity
@Table(name = "user")
public class User {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    public Integer id;
    public String name;
    public String age;

    public Integer getId() {
        return id;
    }

    public User setId(Integer id) {
        this.id = id;
        return this;
    }

    public String getName() {
        return name;
    }

    public User setName(String name) {
        this.name = name;
        return this;
    }

    public String getAge() {
        return age;
    }

    public User setAge(String age) {
        this.age = age;
        return this;
    }
}

repository：

public interface UserRepository extends JpaRepository<User,Integer> {
    @Query("select t from User t where t.name = :name")
    User findBYUserName(@Param("name") String name);

}

service：

@Service
public class UserService {
    @Autowired
    private UserRepository userRepositoty;

    public User findUserByName(String name){
        User user = null;
        try{
            user = userRepositoty.findBYUserName(name);
        }catch (Exception e){}
        return user;
    }

}

controller

@Controller
public class UserController
{
    @Autowired
    private UserService userService;

    @RequestMapping(value = "/user/index")
    public String index(){
        return "user/index";
    }

    @RequestMapping(value = "/user/show",method = RequestMethod.GET)
    @ResponseBody
    public String show(@RequestParam(value = "name")String name){
        User user = userService.findUserByName(name);
        if(null != user)
            return user.getId()+"/"+user.getName();
        else return "null";
    }


}

地址 http://localhost:8080/user/index 旨在实现页面的跳转，html页面实现

地址 http://localhost:8080/user/show 旨在实现查询数据并显示到页面实现

6 在resource包下创建application.propetites文件,配置服务器发布端口和编码，数据库连接，JPA和视图层控制

#server
server.port=8080
server.tomcat.uri-encoding=utf-8

#MySQL
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/test?characterEncoding=utf8
spring.datasource.username=root
spring.datasource.password=123

#Spring Data JPA
spring.jpa.database=MYSQL
spring.jpa.show-sql=true
spring.jpa.hibernate.ddl-auto=update
# Naming strategy
spring.jpa.hibernate.naming-strategy = org.hibernate.cfg.ImprovedNamingStrategy
# stripped before adding them to the entity manager)
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect

#视图层控制
spring.mvc.view.prefix=classpath:/templates/
spring.mvc.view.suffix=.html
spring.mvc.static-path-pattern=/static/**

7 在pom.xml中引入所需要的相关依赖(MySQL连接驱动以及Spring Data JPA,thymeleaf模板引擎)

<!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>5.1.39</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-thymeleaf -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-thymeleaf</artifactId>
    <version>1.4.0.RELEASE</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework.data/spring-data-jpa -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-jpa</artifactId>
    <version>1.5.1.RELEASE</version>
</dependency>

8 在resource包下创建templates和static,分别存放html页面和脚本文件

9 在java包下创建configuration包存放配置类配置扫描包的位置，包括入口类

Entry:

@SpringBootApplication
@ComponentScan(basePackages = "com.cp")
class Entry {
    public static void main(String[] args) throws Exception {
        SpringApplication.run(Entry.class, args);
    }
}

JpaConfiguration :

@Order(Ordered.HIGHEST_PRECEDENCE)
@Configuration
@EnableTransactionManagement(proxyTargetClass = true)
@EnableJpaRepositories(basePackages = "com.cp.repository")
@EntityScan(basePackages = "com.cp.entity")
public class JpaConfiguration {
    @Bean
    PersistenceExceptionTranslationPostProcessor persistenceExceptionTranslationPostProcessor(){
        return new PersistenceExceptionTranslationPostProcessor();
    }
}

在测试的时候出现了，找不到/user/mapping的错误，目前我没有找到原因，只是修改了包的结构，在java包下新增加了com和cp包，更改了configuration的包的引用才可以

使用idea搭建springboot

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