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SpringBoot,Vue前后端分离开发首秀

需求：读取数据库的数据展现到前端页面技术栈：后端有主要有SpringBoot,lombok,SpringData JPA,Swagger,跨域，前端有Vue和axios 不了解这些技术的可以去入门一下lombok入门 swagger入门 SpringData JPA入门配置：mysql 8.0.11,IntelliJ IDEA 2017.1.2,HBuilderX 1.9.3

首先创建一个Spring Boot项目，目录结构如下：

在pom.xml中加入如下依赖

<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-devtools</artifactId>
			<scope>runtime</scope>
		</dependency>
		<dependency>
			<groupId>org.projectlombok</groupId>
			<artifactId>lombok</artifactId>
			<optional>true</optional>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>

		<!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<version>8.0.11</version>
		</dependency>

		<!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-data-jpa -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-data-jpa</artifactId>
			<version>2.1.4.RELEASE</version>
		</dependency>
		<dependency>
			<groupId>io.springfox</groupId>
			<artifactId>springfox-swagger2</artifactId>
			<version>2.7.0</version>
		</dependency>
		<dependency>
			<groupId>io.springfox</groupId>
			<artifactId>springfox-swagger-ui</artifactId>
			<version>2.7.0</version>
		</dependency>
	</dependencies>
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application.properties配置

#端口
server.port=8888
#连接数据库的配置
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.password=Panbing936@
spring.datasource.username=root
spring.datasource.url=jdbc:mysql://localhost:3306/test?characterEncoding=utf8&useSSL=false&serverTimezone=GMT%2B8 
#SpringData JPA的配置
spring.jpa.hibernate.ddl-auto=update
spring.jpa.database-platform=org.hibernate.dialect.MySQL5Dialect
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实体类User.java

@Entity
@Data
public class User{

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Integer id;
    @Column(length = 55)
    private String name;
    private String avatarURL;
}
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接口UserMapper.java继承JpaRepository

public interface UserMapper extends JpaRepository<User,Integer> {
}
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Controller.java

@RestController
@RequestMapping(value = "/api",produces = APPLICATION_JSON_VALUE)
@Api(description = "用户管理")
public class UserController {

    @Autowired
    private UserMapper userMapper;

    @ApiOperation(value = "用户列表",notes = "查寻所有已注册过的用户信息")
    @RequestMapping(value = "getAll",method = RequestMethod.GET)
    public List<User> getAll()
    {
        return userMapper.findAll();
    }
}
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SwaggerConfig.java

@Configuration
@EnableSwagger2
public class SwaggerConfig {
    @Bean
    public Docket createRestApi() {
        return new Docket(DocumentationType.SWAGGER_2)
                .apiInfo(apiInfo())
                .select()
                .apis(RequestHandlerSelectors.basePackage("cn.niit.controller"))
                .paths(PathSelectors.any())
                .build();
    }

    private ApiInfo apiInfo() {
        return new ApiInfoBuilder()
                .title("Spring Boot中使用Swagger2实现前后端分离开发")
                .description("此项目只是练习如何实现前后端分离开发的小Demo")
                .termsOfServiceUrl("https://www.jianshu.com/u/2f60beddf923")
                .contact("WEN")
                .version("1.0")
                .build();
    }
}
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WebConfig.java是实现跨域的配置，务必记得

@Configuration
class WebMvcConfigurer extends WebMvcConfigurerAdapter {
    //跨域配置
    @Bean
    public WebMvcConfigurer corsConfigurer() {
        return new WebMvcConfigurer() {
            @Override
            //重写父类提供的跨域请求处理的接口
            public void addCorsMappings(CorsRegistry registry) {
                //添加映射路径
                registry.addMapping("/**")
                        //放行哪些原始域
                        .allowedOrigins("*")
                        //是否发送Cookie信息
                        .allowCredentials(true)
                        //放行哪些原始域(请求方式)
                        .allowedMethods("GET", "POST", "PUT", "DELETE")
                        //放行哪些原始域(头部信息)
                        .allowedHeaders("*")
                        //暴露哪些头部信息（因为跨域访问默认不能获取全部头部信息）
                        .exposedHeaders("Header1", "Header2");
            }
        };
    }
}
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点击 localhost:8888/swagger-ui.html 查看生成的接口文档，测试一下

返回数据没有问题，接着可以根据文档开发前端代码了

用HBuilderX新建一个test.html页面，具体代码如下

<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8" />
		<title>Vue.js-访问API接口数据-蓝墨云班课练习</title>
		<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1,user-scalable=no">
		<meta http-equiv="X-UA-Compatible" content="ie=edge">
		<!-- 通过CDN引入Vue.js -->
		<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
		<!-- 通过CDN引入axios -->
		<script src="https://unpkg.com/axios/dist/axios.min.js"></script>
		<style type="text/css">
			.container{
				display: flex;
				flex-direction: column;
			}
			.card{
				display: flex;
				margin-bottom: 10px;
			}
			.cover{
				width: 100px;
				height: 100px;
			}
			.cover img{
				width: 100%;
				height: 100%;
			}
		</style>
	</head>
	<body>
		<div id="app">
			<div class="top">
				<p>{{users.length}}个人在线</p>
			</div>
			<hr>
			<div class="container">
				<div class="card" v-for="user in users">
					<div class="cover">
						<img :src="'img/'+user.avatarURL">
					</div>
					<div class="">
						<p>{{user.id}}</p>
					</div>
					<div class="">
						<p>{{user.name}}</p>
					</div>
					
				</div>
			
			</div>
			
		</div>
		<script type="text/javascript">
			var app = new Vue({
				el: '#app',
				data: {
					users: []
				},
				created: function() {
					var _this = this;
					axios.get('http://localhost:8888/api/getAll')
						.then(function(response) {
							_this.users = response.data;
						})
				}
			})
		</script>
	</body>
</html>
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目录结构和运行结果如下