搭建spring-boot项目

spring-boot, spring-cloud….学java然后就是各种spring…学的都忘了spring居然是春天，这么美好的含义…

先装java吧

下个1.8的jdk包，安装

> java -version
java version "1.8.0_172"
Java(TM) SE Runtime Environment (build 1.8.0_172-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.172-b11, mixed mode)

管理工具

maven or gradle, xml恐惧症的选了gradle

brew install gradle

> gradle --version
Welcome to Gradle 4.10.2!

搭建spring-boot项目基本框架

通过Spring Initializr来生成，dependencies选择web spring-boot-starter-web 里面包含了 spring-boot-starter
自动生成的resources里面默认使用application.properties，这个文件是spring boot工程的主要配置文件，支持application.yml和application.properties两种形式，喜欢yml的请把文件修好成application.yml
build.gradle文件中，apply plugin: 'eclipse'改成apply plugin: 'idea'
./gradlew idea生成IntelliJ IDEA工程文件
gradle build or 使用项目下面的gradle ./gradlew build 使用./gradlew 会在项目目录的.gradle/下载一个gradle, 并且在gradle/wrapper/gradle-wrapper.properties中设置了下载的gradle的地址
./gradlew tasks 查看所有gradle的task

项目的xxxApplication.java文件是项目入口

@SpringBootApplication //= @Configuration + @ComponentScan + @EnableAutoConfiguration
public class CatteryApplication {

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

此刻项目目录

├── build.gradle
├── gradle
│   └── wrapper
│       ├── gradle-wrapper.jar
│       └── gradle-wrapper.properties
├── gradlew
├── gradlew.bat
└── src
    ├── main
    │   └── java
    │       └── com.cattery
    │           └── CatteryApplication.java
    └── test
        └── java

实现一个controller

com.cattery目录下创建home目录，在home目录下创建HomeController.java

@RestController("/home")
public class HomeController {

 @GetMapping
 public String index() {
     return "hello";
 }
}

此刻项目目录

├── build.gradle
├── gradle
│   └── wrapper
│       ├── gradle-wrapper.jar
│       └── gradle-wrapper.properties
├── gradlew
├── gradlew.bat
└── src
    ├── main
    │   └── java
    │       └── com.cattery
    |           ├── home
    |                 └── HomeController.java
    │           └── CatteryApplication.java
    └── test
        └── java

./gradlew bootRun
访问 http://localhost:8080/home

连接数据库 postgreSql

使用psql数据库，build.gradle文件加入runtime('org.postgresql:postgresql')
使用阿里提供的 https://github.com/alibaba/druid/tree/master/druid-spring-boot-starter 数据库连接池
build.gradle文件加入compile('com.alibaba:druid-spring-boot-starter:1.1.10') java各种数据库连接池对比
另外build.gradle文件在加入compile("org.springframework.boot:spring-boot-starter-data-jpa") 引入jpa

application.yml中加入

spring:
  datasource:
 druid:
   url: jdbc:postgresql://127.0.0.1:5432/probation_production
   username: postgres
   password:
   driver-class-name: org.postgresql.Driver

./gradlew bootRun，访问 http://localhost:8080/druid/index.html 查看数据库监控

配置jpa和show sql log，application.yml如下

spring:
  datasource:
 druid:
   url: jdbc:postgresql://127.0.0.1:5432/probation_production
   username: postgres
   password:
  jpa:
 database-platform: org.hibernate.dialect.PostgreSQL9Dialect
 database: postgresql
 properties:
   hibernate:
     ddl-auto: none
     temp:
       use_jdbc_metadata_defaults: false
logging:
  level:
 org:
   hibernate:
     type:
       descriptor:
         sql:
           BasicBinder: TRACE
     SQL: DEBUG

创建实体

@Entity
@Table(name = "roles")
public class Role implements Serializable {
 @Id
 @GeneratedValue(strategy = GenerationType.IDENTITY)
 private Long id;
 private String name;

 public Long getId() {
     return id;
 }

 public void setId(Long id) {
     this.id = id;
 }

 public String getName() {
     return name;
 }

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

 @Override
 public String toString() {
     return "User [id=" + id + ", name=" + name + "]";
 }
}

创建数据库操作接口

public interface RoleRepository extends CrudRepository<Role, Long> {
}

创建对应的controller

package com.cattery.role;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

@RestController
@RequestMapping("/roles")
public class RoleController {
    @Autowired
    private RoleRepository roleRepository;

    @GetMapping
    public Object index() {
        Iterable<Role> roles = roleRepository.findAll();
        return roles;
    }

    @PutMapping
    public Object update(@RequestParam(name = "role") Role role) {
        roleRepository.save(role);
        return role;
    }

    @PostMapping
    public Object create(@RequestParam(name = "name") String name) {
        Role role = new Role();
        role.setName(name);
        roleRepository.save(role);
        return role;
    }

    @DeleteMapping
    public Object delete(@RequestParam(name = "id") Long id) {
        roleRepository.deleteById(id);
        return id;
    }
}

./gradlew build & ./gradlew bootRun, 访问 http://localhost:8080/roles

打包运行

./gradlew jar
根据build.gradle的配置version = '0.0.1-SNAPSHOT'和settings.gradle的配置rootProject.name ='cattery'生成jar名
java -jar build/libs/xxx.jar

查看Druid监控

./gradlew bootRun，访问 http://localhost:8080/druid/index.html 查看数据库监控
配置用户名，密码，创建DruidConfig

@SpringBootConfiguration
public class DruidConfig {

    @Bean
    public ServletRegistrationBean statViewServlet() {
        ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean(new StatViewServlet(),
                "/druid/*");
        servletRegistrationBean.addInitParameter("allow", "127.0.0.1");
        servletRegistrationBean.addInitParameter("deny", "192.168.0.1");
        servletRegistrationBean.addInitParameter("loginUsername", "admin");
        servletRegistrationBean.addInitParameter("loginPassword", "123456");
        servletRegistrationBean.addInitParameter("resetEnable", "false");
        return servletRegistrationBean;
    }

    @Bean
    public FilterRegistrationBean statFilter() {
        FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean(new WebStatFilter());
        filterRegistrationBean.addUrlPatterns("/*");
        filterRegistrationBean.addInitParameter("exclusions", "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*");
        return filterRegistrationBean;
    }

}

./gradlew build & ./gradlew bootRun，访问http://localhost:8080/druid/index.html 输入用户名密码查看监控数据

github example repo: https://github.com/dongjx/spring-boot-example

参考资料

用Gradle构建Spring Boot项目