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

2017-09-13 14:27 483 查看

第8_章: Spring Boot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,ORM层使用mybatis,模板引擎使用freemarker,构建工具使用Gradle。

关于Groovy语言,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,配置build.gradle依赖





我们得到一个标准的gradle工程,目录如下:



由于我们勾选了Groovy支持,gradle依赖如下:

group 'com.easy.springboot'
version '1.0-SNAPSHOT'

apply plugin: 'groovy'
apply plugin: 'java'

sourceCompatibility = 1.8

repositories {
mavenCentral()
}

dependencies {
compile 'org.codehaus.groovy:groovy-all:2.3.11'
testCompile group: 'junit', name: 'junit', version: '4.11'
testCompile group: 'junit', name: 'junit', version: '4.12'
}

添加SpringBoot依赖

boot-plugin

apply plugin: 'org.springframework.boot'

freemarker-starter

compile('org.springframework.boot:spring-boot-starter-web')
compile('org.springframework.boot:spring-boot-starter-freemarker')

mybatis-spring-boot-starter

compile('org.mybatis.spring.boot:mybatis-spring-boot-starter:1.1.1')

mysql jdbc驱动

compile('mysql:mysql-connector-java:6.0.5')

构建脚本

buildscript {
ext {
springBootVersion = '1.5.2.RELEASE'
}
repositories {
mavenCentral()
}
dependencies {
classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
}
}

我们可以看出,在构建脚本里,dependencies里面依赖了spring-boot-gradle-plugin,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(jar,war),运行Spring Boot 应用,进行依赖管理等。

具体实现可以看plugin的源码工程: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:

spring:
datasource:
url: jdbc:mysql://localhost:3306/bms?serverTimezone=UTC&useSSL=false
username: root
password: root
driver-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,是通过下面的xml配置:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<settings>
<setting name="mapUnderscoreToCamelCase" value="true"/>
</settings>
</configuration>

对应的,我们使用注解的方式

@Configuration
class MybatisConfig {
@Bean
@Primary
MybatisProperties mybatisProperties() {
MybatisProperties p = new MybatisProperties()
org.apache.ibatis.session.Configuration config = 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 = true
p.configuration = config

p

}
}

其中,@Primary注解的功能:当自动装配Bean时当出现多个Bean候选者时,被注解为@Primary的Bean将作为首选者,否则将抛出异常。

如果不标记,会报如下错误:

Field properties in org.mybatis.spring.boot.autoconfigure.MybatisAutoConfiguration required a single bean, but 2 were found:
- mybatisProperties: defined by method 'mybatisProperties' in class path resource [com/esay/springboot/bms/config/MybatisConfig.class]
- mybatis-org.mybatis.spring.boot.autoconfigure.MybatisProperties: defined in null

Action:

Consider marking one of the beans as @Primary, updating the consumer to accept multiple beans, or using @Qualifier to identify the bean that should be consumed

通过这个错误日志,我们可以更直观的看出@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.
*/
@Mapper
public interface BookMapper {
@Select("select * from book where state = #{state}")
List<Book> findByState(@Param("state") String state);

@Select("select * from book")
List<Book> findAll();

@Insert({
"insert into book",
"set name = #{b.name},",
"author = #{b.author},",
"isbn = #{b.isbn},",
"inDate = #{b.inDate},",
"outDate = #{b.outDate},",
"press = #{b.press},",
"state = #{b.state}"
})
@Options(useGeneratedKeys = true, keyProperty = "id")
//使用@Options注解的userGeneratedKeys 和keyProperty属性让数据库产生auto_increment(自增长)列的值,然后将生成的值设置到输入参数对象的属性中。
Book insert(@Param("b") Book book) throws RuntimeException;

}

写控制器Controller层

package com.esay.springboot.bms.controller

import 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.
*/
@Controller
class BookController {

@Autowired
BookService bookService;

@GetMapping("/book")
@ResponseBody
List<Book> findByState(@RequestParam(value = "state", required = false) String state) {
if (StringUtils.isEmpty(state)) {
List<Book> all = bookService.findAll()
println(JSON.toJSONString(all,SerializerFeature.PrettyFormat,SerializerFeature.WriteMapNullValue))
//            println(new JsonOutput().toJson(all))
bookService.findAll()
} else {
bookService.findByState(state)
}
}

@GetMapping("/bookPage")
String findAll(Model model) {
List<Book> books = bookService.findAll()
model.addAttribute("books", books)
"book/list"
}

}

写视图View层

<!DOCTYPE html>
<html lang="zh">
<body>
<br>
<div>
<#list books as book>
<p></p>
<li>书名: ${book.name}</li>
<li>作者: ${book.author}</li>
<li>出版社: ${book.press}</li>
<li>借出时间: ${book.outDate?string('yyyy/MM/dd HH:mm:ss')}</li>
<li>还书时间: ${book.inDate?string('yyyy/MM/dd HH:mm:ss')}</li>
<li>状态: ${book.state}</li>
</#list>
</div>
</body>

</html>

Freemarker日期格式化使用:

<li>借出时间: ${book.outDate?string('yyyy/MM/dd HH:mm:ss')}</li>
<li>还书时间: ${book.inDate?string('yyyy/MM/dd HH:mm:ss')}</li>

运行测试

命令行运行

gradle bootRun

启动成功, 浏览器访问:http://localhost:8009/bookPage
你将看到类似如下页面:



访问Rest API接口:http://localhost:8009/book?state=NORMAL
我们可以看到如下输出:

[
{
"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:https://github.com/EasySpringBoot/bms
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