Java Maven+Idea 构建SpringBoot项目(光速入门)

• springboot+jpa+druid构建Restful服务
• springboot官网
• maven 创建项目

mvn archetype:generate -DgroupId=com.mico.emptyspringboot -DartifactId=emptyspringboot -DarchetypeArtifactId=maven-archetype-quickstart -DinteractivMode=false

• 当然你可以从springboot的官网下载quickstart,也可以从intelij idea的File->New->Project->Spring Initializr
  
  

  Spring Initializr
  
  
  

  springboot-start

• pom.xml大概像这样:

    4.0.0
    
        org.springframework.boot
        spring-boot-starter-parent
        2.1.2.RELEASE
         
    
    com.mico.domo.springboot
    demo
    0.0.1-SNAPSHOT
    demo
    Demo project for Spring Boot

    
        1.8
    

    
        
            org.springframework.boot
            spring-boot-starter-data-jpa
        

        
            org.springframework.boot
            spring-boot-starter-web
        
        
            mysql
            mysql-connector-java
            runtime
        
        
            org.projectlombok
            lombok
            true
        
        
            com.alibaba
            druid
            1.0.18
        
        
            org.slf4j
            log4j-over-slf4j
        

        
            org.springframework.boot
            spring-boot-starter-test
            test
        
    

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

• 本地已创建项目push到远程git
• springboot的配置文件application.properties

# Server Domain-Port
server.address=127.0.0.1
server.port=9090

#spring-datasource
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&characterEncoding=UTF-8&useSSL=true
spring.datasource.username=root
spring.datasource.password=micocube
spring.datasource.driverClassName=com.mysql.cj.jdbc.Driver
spring.datasource.initialSize=5
spring.datasource.minIdle=5
spring.datasource.maxActive=20
spring.datasource.maxWait=60000
spring.datasource.timeBetweenEvictionRunsMillis=60000
spring.datasource.minEvictableIdleTimeMillis=300000
spring.datasource.validationQuery=SELECT 1 FROM DUAL
spring.datasource.testWhileIdle=true
spring.datasource.testOnBorrow=false
spring.datasource.testOnReturn=false
spring.datasource.poolPreparedStatements=true
spring.datasource.maxPoolPreparedStatementPerConnectionSize=20
spring.datasource.filters=stat,wall,log4j
spring.datasource.connectionProperties=druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000
spring.datasource.useGlobalDataSourceStat=true
#JPA Configuration:
spring.jpa.database=MYSQL
# Show or not log for each sql query
spring.jpa.show-sql=true
spring.jpa.generate-ddl=true  
# Hibernate ddl auto (create, create-drop, update)
spring.jpa.hibernate.ddl-auto=update


#log
logging.config=classpath:logback.xml
LOG_PATH=./logs/coding.log



#encoding
spring.http.encoding.force=true
spring.http.encoding.charset=UTF-8
spring.http.encoding.enabled=true
server.tomcat.uri-encoding=UTF-8

• springboot日志配置文件,logback.xml,Springboot logback.xml配置文件详解,
  Springboot 使用druid连接池抛ClassNotFoundException

    
        /data/www/file/logs/springboot.log

        
            %date %d{HH: mm:ss.SSS} %level [%thread] %logger{10} [%file:%line] %msg%n
        
    

    
    
        %date %d{HH: mm:ss.SSS} %level [%thread] %logger{10} [%file:%line] %msg%n
    
    

    
        
        
    

• springboot启动类Application.java

package com.mico.domo.springboot.demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class DemoApplication {

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

}

• 数据源配置

package com.mico.emptyspringboot.config;

import com.alibaba.druid.pool.DruidDataSource;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;

import javax.sql.DataSource;
import java.sql.SQLException;

/**
 * DruidDBConfig类被@Configuration标注，用作配置信息；
 * DataSource对象被@Bean声明，为Spring容器所管理，
 * @Primary表示这里定义的DataSource将覆盖其他来源的DataSource。
 *jdbc.url=${jdbc.url}
 *最新的支持方式如下:
 *[email protected]@
 */
@Configuration
public class DruidDBConfig {
//  private Logger logger = LoggerFactory.getLogger(DruidDBConfig.class);

    @Value("${spring.datasource.url}")
    private String dbUrl;

    @Value("${spring.datasource.username}")
    private String username;

    @Value("${spring.datasource.password}")
    private String password;

    @Value("${spring.datasource.driverClassName}")
    private String driverClassName;

    @Value("${spring.datasource.initialSize}")
    private int initialSize;

    @Value("${spring.datasource.minIdle}")
    private int minIdle;

    @Value("${spring.datasource.maxActive}")
    private int maxActive;

    @Value("${spring.datasource.maxWait}")
    private int maxWait;

    @Value("${spring.datasource.timeBetweenEvictionRunsMillis}")
    private int timeBetweenEvictionRunsMillis;

    @Value("${spring.datasource.minEvictableIdleTimeMillis}")
    private int minEvictableIdleTimeMillis;

    @Value("${spring.datasource.validationQuery}")
    private String validationQuery;

    @Value("${spring.datasource.testWhileIdle}")
    private boolean testWhileIdle;

    @Value("${spring.datasource.testOnBorrow}")
    private boolean testOnBorrow;

    @Value("${spring.datasource.testOnReturn}")
    private boolean testOnReturn;

    @Value("${spring.datasource.poolPreparedStatements}")
    private boolean poolPreparedStatements;

    @Value("${spring.datasource.maxPoolPreparedStatementPerConnectionSize}")
    private int maxPoolPreparedStatementPerConnectionSize;

    @Value("${spring.datasource.filters}")
    private String filters;

    @Value("{spring.datasource.connectionProperties}")
    private String connectionProperties;

    @Bean // 声明其为Bean实例
    @Primary // 在同样的DataSource中，首先使用被标注的DataSource
    public DataSource dataSource() {
        DruidDataSource datasource = new DruidDataSource();

        datasource.setUrl(this.dbUrl);
        datasource.setUsername(username);
        datasource.setPassword(password);
        datasource.setDriverClassName(driverClassName);

        // configuration
        datasource.setInitialSize(initialSize);
        datasource.setMinIdle(minIdle);
        datasource.setMaxActive(maxActive);
        datasource.setMaxWait(maxWait);
        datasource.setTimeBetweenEvictionRunsMillis(timeBetweenEvictionRunsMillis);
        datasource.setMinEvictableIdleTimeMillis(minEvictableIdleTimeMillis);
        datasource.setValidationQuery(validationQuery);
        datasource.setTestWhileIdle(testWhileIdle);
        datasource.setTestOnBorrow(testOnBorrow);
        datasource.setTestOnReturn(testOnReturn);
        datasource.setPoolPreparedStatements(poolPreparedStatements);
        datasource.setMaxPoolPreparedStatementPerConnectionSize(maxPoolPreparedStatementPerConnectionSize);
        try {
            datasource.setFilters(filters);
        } catch (SQLException e) {

        }
        datasource.setConnectionProperties(connectionProperties);

        return datasource;
    }
}

• App 配置类，WebAppConfigurer

package com.mico.emptyspringboot.config;

import org.springframework.boot.web.servlet.MultipartConfigFactory;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.StringHttpMessageConverter;
import org.springframework.util.unit.DataSize;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

import javax.servlet.MultipartConfigElement;
import java.nio.charset.Charset;

/**
 * 访问uri:http://localhost:9090/swagger-ui.html
 */
@Configuration
public class WebAppConfigurer implements WebMvcConfigurer {


    @Override
    public void addViewControllers(ViewControllerRegistry registry) {
        registry.addViewController("/sign_in").setViewName("thymeleaf/login");
        registry.addViewController("/sign_up").setViewName("thymeleaf/registry");
        /**
         * 与上面的等效
        @RequestMapping("/sign_in")
        public String sign_in() {
        return "thymeleaf/login";
        }
        @RequestMapping("/sign_up")
         public String sign_up() {
         return "thymeleaf/registry";
         }
         */
    }


    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/static/**").addResourceLocations("classpath:/static/");
    }


    @Bean
    public MultipartConfigElement multipartConfigElement(){
        MultipartConfigFactory factory = new MultipartConfigFactory();
        factory.setMaxFileSize(DataSize.ofMegabytes(10));
        factory.setMaxRequestSize(DataSize.ofMegabytes(10));
        return factory.createMultipartConfig();
    }

    @Bean
    public HttpMessageConverter responseBodyConverter() {
        StringHttpMessageConverter converter = new StringHttpMessageConverter(Charset.forName("UTF-8"));
        return converter;
    }
}

• domain

package com.mico.domo.springboot.demo.domain;

import lombok.Data;

import javax.persistence.*;

@Entity
@Table
@Data
public class Role {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer id;
    private String name;


    public Role(){

    }

    public Role(String name) {
        this.name = name;
    }
}

package com.mico.domo.springboot.demo.domain;

import lombok.Data;

import javax.persistence.*;
import java.util.List;

@Entity
@Table
@Data
public class User {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer id;
    private String username;
    private String password;
    @ManyToMany(cascade = {CascadeType.REFRESH},fetch = FetchType.EAGER)
    private List roles;

    public User() {
    }

    public User(String username, String password) {
        this.username = username;
        this.password = password;
    }
}

• DAO

package com.mico.domo.springboot.demo.repository;

import com.mico.domo.springboot.demo.domain.User;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Query;
import org.springframework.data.repository.query.Param;

public interface UserRepository extends JpaRepository {

    User findByUsername(String name);

    @Query(value = "FROM User u where u.username=:name")
    User findUser(@Param("name") String name);

}

• Service

package com.mico.domo.springboot.demo.service;


import com.mico.domo.springboot.demo.domain.User;
import com.mico.domo.springboot.demo.repository.UserRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.List;
import java.util.Objects;

@Service
public class UserDetailsService {

    @Autowired
    private UserRepository userRepository;


    public User loadUserByUsername(String s) {
        return userRepository.findByUsername(s);
    }
}

• Controller

package com.mico.domo.springboot.demo.controller;


import com.mico.domo.springboot.demo.domain.User;
import com.mico.domo.springboot.demo.service.UserDetailsService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import javax.servlet.http.HttpServletRequest;

@RestController  
@RequestMapping("/user")  
public class UserController {
    @Autowired
    private UserDetailsService userDetailsService;
  
    @RequestMapping(value = "/{id}",method = RequestMethod.GET)
    @ResponseBody
    public User view(@PathVariable("id") Integer id) {
        User user = new User();  
        user.setId(id);
        user.setUsername("zhang");
        return user;  
    }
    @RequestMapping(value = "/login")
    @ResponseBody
    public User login(String userName, String password) {
        User user = userDetailsService.loadUserByUsername(userName);
        return user;
    }
}  

• spring.jpa.hibernate.ddl-auto=update时jpa会自动创建数据库，插入数据

INSERT INTO test.role (id,name) VALUES (1,'User');
INSERT INTO test.user (id,username, password) VALUES (1,'root', '$2a$10$TeayMIrpuDwrpLHL5QsNpOcPeE/Kx3c4UYbi4NQzNkfKgf9YtL6F2');
INSERT INTO test.user_roles (user_id, roles_id) VALUES (1, 1);

• Run DemoApplication.main会从9090端口启动服务

  
  
  

  最终效果
• 项目源码