《SpringBoot极简教程》第8_章：SpringBoot集成Groovy混合Java开发

本章我们使用SpringBoot集成Groovy混合Java开发一个极简的RestAPI。 数据库使用mysql&＃xff0c;ORM层使用mybatis&＃xff0c;模板引擎使用freemarker&＃xff0c;构建工具使用Gradle。

关于Groovy语言&＃xff0c;我们在上一章已经简单介绍了。本章就不再多说。

新建Gradle工程&＃xff0c;配置build.gradle依赖

我们得到一个标准的gradle工程&＃xff0c;目录如下&＃xff1a;

由于我们勾选了Groovy支持&＃xff0c;gradle依赖如下&＃xff1a;

group &＃39;com.easy.springboot&＃39;
version &＃39;1.0-SNAPSHOT&＃39;apply plugin: &＃39;groovy&＃39;
apply plugin: &＃39;java&＃39;sourceCompatibility &＃61; 1.8repositories {mavenCentral()
}dependencies {compile &＃39;org.codehaus.groovy:groovy-all:2.3.11&＃39;testCompile group: &＃39;junit&＃39;, name: &＃39;junit&＃39;, version: &＃39;4.11&＃39;testCompile group: &＃39;junit&＃39;, name: &＃39;junit&＃39;, version: &＃39;4.12&＃39;
}

添加SpringBoot依赖

boot-plugin

apply plugin: &＃39;org.springframework.boot&＃39;


freemarker-starter

compile(&＃39;org.springframework.boot:spring-boot-starter-web&＃39;)compile(&＃39;org.springframework.boot:spring-boot-starter-freemarker&＃39;)


mybatis-spring-boot-starter

compile(&＃39;org.mybatis.spring.boot:mybatis-spring-boot-starter:1.1.1&＃39;)


mysql jdbc驱动

compile(&＃39;mysql:mysql-connector-java:6.0.5&＃39;)


构建脚本

buildscript {ext {springBootVersion &＃61; &＃39;1.5.2.RELEASE&＃39;}repositories {mavenCentral()}dependencies {classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")}
}


我们可以看出&＃xff0c;在构建脚本里&＃xff0c;dependencies里面依赖了spring-boot-gradle-plugin&＃xff0c;其版本是我们使用的SpringBoot的版本。

SpringBoot Gradle 插件是SpringBoot针对 Gradle定制的工具, 可以帮助我们打包&＃xff08;jar&＃xff0c;war&＃xff09;&＃xff0c;运行Spring Boot 应用&＃xff0c;进行依赖管理等。

具体实现可以看plugin的源码工程&＃xff1a;https://github.com/spring-projects/spring-boot/tree/master/spring-boot-tools

配置数据库DataSource

创建application.yml文件,配置数据库信息&＃xff1a;

spring:datasource:url: jdbc:mysql://localhost:3306/bms?serverTimezone&＃61;UTC&useSSL&＃61;falseusername: rootpassword: rootdriver-class-name: com.mysql.cj.jdbc.Driver


写领域模型类

package com.esay.springboot.bms.domain
/*** Created by jack on 2017/4/15.*/
class Book {Long id;String name;String isbn;String author;String press;
// Date in_date;
// Date out_date;Date inDate;Date outDate;String state;
}

我们以前使用mybatis开启数据库字段自动映射驼峰命名规则java属性&＃xff0c;是通过下面的xml配置&＃xff1a;

对应的&＃xff0c;我们使用注解的方式

&＃64;Configuration
class MybatisConfig {&＃64;Bean&＃64;PrimaryMybatisProperties mybatisProperties() {MybatisProperties p &＃61; new MybatisProperties()org.apache.ibatis.session.Configuration config &＃61; new org.apache.ibatis.session.Configuration()// 开启mybatis开启数据库字段自动映射驼峰命名规则java属性config.mapUnderscoreToCamelCase &＃61; truep.configuration &＃61; configp}
}


其中&＃xff0c;&＃64;Primary注解的功能&＃xff1a;当自动装配Bean时当出现多个Bean候选者时&＃xff0c;被注解为&＃64;Primary的Bean将作为首选者&＃xff0c;否则将抛出异常。

如果不标记&＃xff0c;会报如下错误&＃xff1a;

Field properties in org.mybatis.spring.boot.autoconfigure.MybatisAutoConfiguration required a single bean, but 2 were found:- mybatisProperties: defined by method &＃39;mybatisProperties&＃39; in class path resource [com/esay/springboot/bms/config/MybatisConfig.class]- mybatis-org.mybatis.spring.boot.autoconfigure.MybatisProperties: defined in nullAction:Consider marking one of the beans as &＃64;Primary, updating the consumer to accept multiple beans, or using &＃64;Qualifier to identify the bean that should be consumed


通过这个错误日志&＃xff0c;我们可以更直观的看出&＃64;Primary注解的功能。

Mapper层代码

package com.esay.springboot.bms.mapper;import java.util.List;import com.esay.springboot.bms.domain.Book;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Options;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;/*** Created by jack on 2017/4/15.*/
&＃64;Mapper
public interface BookMapper {&＃64;Select("select * from book where state &＃61; #{state}")List findByState(&＃64;Param("state") String state);&＃64;Select("select * from book")List findAll();&＃64;Insert({"insert into book","set name &＃61; #{b.name},","author &＃61; #{b.author},","isbn &＃61; #{b.isbn},","inDate &＃61; #{b.inDate},","outDate &＃61; #{b.outDate},","press &＃61; #{b.press},","state &＃61; #{b.state}"})&＃64;Options(useGeneratedKeys &＃61; true, keyProperty &＃61; "id")//使用&＃64;Options注解的userGeneratedKeys 和keyProperty属性让数据库产生auto_increment&＃xff08;自增长&＃xff09;列的值&＃xff0c;然后将生成的值设置到输入参数对象的属性中。Book insert(&＃64;Param("b") Book book) throws RuntimeException;}

写控制器Controller层

package com.esay.springboot.bms.controllerimport com.alibaba.fastjson.JSON
import com.alibaba.fastjson.serializer.SerializerFeature
import com.esay.springboot.bms.domain.Book
import com.esay.springboot.bms.service.BookService
import groovy.json.JsonOutput
import org.springframework.beans.factory.annotation.Autowired
import org.springframework.stereotype.Controller
import org.springframework.ui.Model
import org.springframework.util.StringUtils
import org.springframework.web.bind.annotation.GetMapping
import org.springframework.web.bind.annotation.RequestParam
import org.springframework.web.bind.annotation.ResponseBody/*** Created by jack on 2017/4/15.*/
&＃64;Controller
class BookController {&＃64;AutowiredBookService bookService;&＃64;GetMapping("/book")&＃64;ResponseBodyList findByState(&＃64;RequestParam(value &＃61; "state", required &＃61; false) String state) {if (StringUtils.isEmpty(state)) {List all &＃61; bookService.findAll()println(JSON.toJSONString(all,SerializerFeature.PrettyFormat,SerializerFeature.WriteMapNullValue))
// println(new JsonOutput().toJson(all))bookService.findAll()} else {bookService.findByState(state)}}&＃64;GetMapping("/bookPage")String findAll(Model model) {List books &＃61; bookService.findAll()model.addAttribute("books", books)"book/list"}}

写视图View层

Freemarker日期格式化使用&＃xff1a;

运行测试

命令行运行

gradle bootRun


启动成功&＃xff0c; 浏览器访问&＃xff1a;http://localhost:8009/bookPage
你将看到类似如下页面&＃xff1a;

访问Rest API接口&＃xff1a;http://localhost:8009/book?state&＃61;NORMAL
我们可以看到如下输出&＃xff1a;

[{"id": 1,"name": "极简SpringBoot教程","isbn": "88888888","author": "陈光剑","press": "电子工业出版社","inDate": 1492299756000,"outDate": 1492299756000,"state": "NORMAL"}
] 小结

本章工程源代码&＃xff1a;https://github.com/EasySpringBoot/bms