spring boot 学习笔记
spring boot整合mybatis和swagger2
开发软件:IDEA
首先创建spring项目
选择spring initializr
编辑group和artifact,点击next
添加相关依赖,加入mybatis的依赖
创建成功后的项目结构:
简单看一下这几个文件都是干啥的
ProjectApplication
@SpringBootApplication = (默认属性)@Configuration + @EnableAutoConfiguration + @ComponentScan。
系统会去入口类的同级包以及下级包中去扫描实体类,因此我们建议入口类的位置在groupId+arctifactID组合的包名下。
如果我们只想要@SpringBootApplication去扫描特定的类而不是全部类,那么就可以关闭自动配置,如下:
@SpringBootApplication(exclude = DataSourceAutoConfiguration.class)
application.properties
Spring Boot使用一个全局的配置文件application.properties或者application.yml,配置文件放在src/main/resources目录下。properties是我们常见的一种配置文件,Spring Boot不仅支持properties这种类型的配置文件,也支持yaml语言的配置文件
pom.xml一个基本项目的pom.xml文件,通常至少有三个部分
第一部分,项目坐标,信息描述等
第二部分,引入jar包
第三部分,构建项目
准备工作
创建文件目录
controller放请求接口
dao目录存放和mapper匹配的操作数据库的接口
model是实体类
service里面放具体业务的接口和实现
generator放代码自动生成的配置文件
mapper放操作数据库的xml
接下来开始配置框架
>补全pom.xml里面的jar和插件
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.springboot</groupId> <artifactId>project</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>project</name> <description>Demo project for Spring Boot</description> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.0.2.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> <java.version>1.8</java.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-jdbc</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>1.3.2</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <scope>runtime</scope> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <!--补全jar--> <dependency> <groupId>org.apache.commons</groupId> <artifactId>commons-lang3</artifactId> <version>3.4</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-core</artifactId> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> </dependency> <dependency> <groupId>com.fasterxml.jackson.datatype</groupId> <artifactId>jackson-datatype-joda</artifactId> </dependency> <dependency> <groupId>com.fasterxml.jackson.module</groupId> <artifactId>jackson-module-parameter-names</artifactId> </dependency> <!-- 分页插件 --> <dependency> <groupId>com.github.pagehelper</groupId> <artifactId>pagehelper-spring-boot-starter</artifactId> <version>1.2.5</version> </dependency> <!-- alibaba的druid数据库连接池 --> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid-spring-boot-starter</artifactId> <version>1.1.9</version> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> <!-- mybatis generator 自动生成代码插件 --> <plugin> <groupId>org.mybatis.generator</groupId> <artifactId>mybatis-generator-maven-plugin</artifactId> <version>1.3.2</version> <configuration> <configurationFile>${basedir}/src/main/resources/generator/generatorConfig.xml</configurationFile> <overwrite>true</overwrite> <verbose>true</verbose> </configuration> </plugin> </plugins> </build> </project>
在generator文件夹下,添加generatorConfig.xml
配置项目启动类
package com.springboot; import org.mybatis.spring.annotation.MapperScan; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; @SpringBootApplication @MapperScan("com.springboot.dao") public class ProjectApplication { public static void main(String[] args) { SpringApplication.run(ProjectApplication.class, args); } }
配置
本文使用application.yml,所以删掉application.properties,创建application.yml
server: port: 8080 spring: datasource: name: mysql_test type: com.alibaba.druid.pool.DruidDataSource #druid相关配置 druid: #监控统计拦截的filters filters: stat driver-class-name: com.mysql.jdbc.Driver #基本属性 url: jdbc:mysql://127.0.0.1:3306/mytest?useUnicode=true&characterEncoding=UTF-8&allowMultiQueries=true username: root password: root #配置初始化大小/最小/最大 initial-size: 1 min-idle: 1 max-active: 20 #获取连接等待超时时间 max-wait: 60000 #间隔多久进行一次检测,检测需要关闭的空闲连接 time-between-eviction-runs-millis: 60000 #一个连接在池中最小生存的时间 min-evictable-idle-time-millis: 300000 validation-query: SELECT 'x' test-while-idle: true test-on-borrow: false test-on-return: false #打开PSCache,并指定每个连接上PSCache的大小。oracle设为true,mysql设为false。分库分表较多推荐设置为false pool-prepared-statements: false max-pool-prepared-statement-per-connection-size: 20 mybatis: mapper-locations: classpath:mapper/*.xml type-aliases-package: com.springboot.model #pagehelper pagehelper: helperDialect: mysql reasonable: true supportMethodsArguments: true params: count=countSql returnPageInfo: check
mybatis的部分,根据自己的文件夹名称去配置
创建数据库和数据表
CREATE DATABASE mytest;
CREATE TABLE t_user( userId INT NOT NULL PRIMARY KEY AUTO_INCREMENT,
userName VARCHAR(255) NOT NULL ,
password VARCHAR(255) NOT NULL ,
phone VARCHAR(255) NOT NULL)
ENGINE=INNODB AUTO_INCREMENT=1000 DEFAULT CHARSET=utf8;
配置generatorConfig.xml 自动生成与数据库对应的实体类和mapper
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE generatorConfiguration PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN" "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd"> <generatorConfiguration> <!-- 数据库驱动:选择你的本地硬盘上面的数据库驱动包--> <classPathEntry location="E:\mybatis-generator-core-1.3.2\mybatis-generator-core-1.3.2\lib\mysql-connector-java-5.1.25-bin.jar"/> <context id="DB2Tables" targetRuntime="MyBatis3"> <commentGenerator> <property name="suppressDate" value="true"/> <!-- 是否去除自动生成的注释 true:是 : false:否 --> <property name="suppressAllComments" value="true"/> </commentGenerator> <!--数据库链接URL,用户名、密码 --> <jdbcConnection driverClass="com.mysql.jdbc.Driver" connectionURL="jdbc:mysql://127.0.0.1/mytest" userId="root" password="root"> </jdbcConnection> <javaTypeResolver> <property name="forceBigDecimals" value="false"/> </javaTypeResolver> <!-- 生成模型的包名和位置--> <javaModelGenerator targetPackage="com.springboot.model" targetProject="src/main/java"> <property name="enableSubPackages" value="true"/> <property name="trimStrings" value="true"/> </javaModelGenerator> <!-- 生成映射文件的包名和位置--> <sqlMapGenerator targetPackage="mapper" targetProject="src/main/resources"> <property name="enableSubPackages" value="true"/> </sqlMapGenerator> <!-- 生成DAO的包名和位置--> <javaClientGenerator type="XMLMAPPER" targetPackage="com.springboot.dao" targetProject="src/main/java"> <property name="enableSubPackages" value="true"/> </javaClientGenerator> <!-- 要生成的表 tableName是数据库中的表名或视图名 domainObjectName是实体类名--> <table tableName="t_user" domainObjectName="User" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table> </context> </generatorConfiguration>
配置generator
选择run->Edit Configurations
添加maven,在Command line输入mybatis-generator:generate -e
添加成功后,运行generator,生成对应文件
User.java
public class User { private Integer userid; private String username; private String password; private String phone; public Integer getUserid() { return userid; } public void setUserid(Integer userid) { this.userid = userid; } public String getUsername() { return username; } public void setUsername(String username) { this.username = username == null ? null : username.trim(); } public String getPassword() { return password; } public void setPassword(String password) { this.password = password == null ? null : password.trim(); } public String getPhone() { return phone; } public void setPhone(String phone) { this.phone = phone == null ? null : phone.trim(); } }
UserMapper.java
public interface UserMapper { int deleteByPrimaryKey(Integer userid); int insert(User record); int insertSelective(User record); User selectByPrimaryKey(Integer userid); int updateByPrimaryKeySelective(User record); int updateByPrimaryKey(User record); //自己添加的方法 List<User> selectUsers(); }
UserMapper.xml
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" > <mapper namespace="com.springboot.dao.UserMapper" > <resultMap id="BaseResultMap" type="com.springboot.model.User" > <id column="userId" property="userid" jdbcType="INTEGER" /> <result column="userName" property="username" jdbcType="VARCHAR" /> <result column="password" property="password" jdbcType="VARCHAR" /> <result column="phone" property="phone" jdbcType="VARCHAR" /> </resultMap> <sql id="Base_Column_List" > userId, userName, password, phone </sql> <select id="selectByPrimaryKey" resultMap="BaseResultMap" parameterType="java.lang.Integer" > select <include refid="Base_Column_List" /> from t_user where userId = #{userid,jdbcType=INTEGER} </select> <delete id="deleteByPrimaryKey" parameterType="java.lang.Integer" > delete from t_user where userId = #{userid,jdbcType=INTEGER} </delete> <insert id="insert" parameterType="com.springboot.model.User" > insert into t_user (userId, userName, password, phone) values (#{userid,jdbcType=INTEGER}, #{username,jdbcType=VARCHAR}, #{password,jdbcType=VARCHAR}, #{phone,jdbcType=VARCHAR}) </insert> <insert id="insertSelective" parameterType="com.springboot.model.User" > insert into t_user <trim prefix="(" suffix=")" suffixOverrides="," > <if test="userid != null" > userId, </if> <if test="username != null" > userName, </if> <if test="password != null" > password, </if> <if test="phone != null" > phone, </if> </trim> <trim prefix="values (" suffix=")" suffixOverrides="," > <if test="userid != null" > #{userid,jdbcType=INTEGER}, </if> <if test="username != null" > #{username,jdbcType=VARCHAR}, </if> <if test="password != null" > #{password,jdbcType=VARCHAR}, </if> <if test="phone != null" > #{phone,jdbcType=VARCHAR}, </if> </trim> </insert> <update id="updateByPrimaryKeySelective" parameterType="com.springboot.model.User" > update t_user <set > <if test="username != null" > userName = #{username,jdbcType=VARCHAR}, </if> <if test="password != null" > password = #{password,jdbcType=VARCHAR}, </if> <if test="phone != null" > phone = #{phone,jdbcType=VARCHAR}, </if> </set> where userId = #{userid,jdbcType=INTEGER} </update> <update id="updateByPrimaryKey" parameterType="com.springboot.model.User" > update t_user set userName = #{username,jdbcType=VARCHAR}, password = #{password,jdbcType=VARCHAR}, phone = #{phone,jdbcType=VARCHAR} where userId = #{userid,jdbcType=INTEGER} </update> <select id="selectUsers" resultType="com.springboot.model.User"> SELECT <include refid="Base_Column_List"/> FROM t_user </select> </mapper>
接下来开始我们的业务层
添加UserService和UserServiceImpl的实现代码
UserService.java
public interface UserService { int addUser(User user); PageInfo<User> findAllUser(int pageNum, int pageSize); }
UserServiceImpl.java
@Service(value = "userService") public class UserServiceImpl implements UserService { @Autowired private UserMapper userDao;//这里会报错,但是并不会影响 @Override public int addUser(User user) { return userDao.insert(user); } /* * 这个方法中用到了我们开头配置依赖的分页插件pagehelper * 很简单,只需要在service层传入参数,然后将参数传递给一个插件的一个静态方法即可; * pageNum 开始页数 * pageSize 每页显示的数据条数 * */ @Override public PageInfo<User> findAllUser(int pageNum, int pageSize) { //将参数传给这个方法就可以实现物理分页了,非常简单。 PageHelper.startPage(pageNum, pageSize); List<User> userDomains = userDao.selectUsers(); PageInfo result = new PageInfo(userDomains); return result; } }
写个接口
在Controller文件夹下创建接口
@Controller @RequestMapping(value = "/user") public class UserController { @Autowired private UserService userService;
@ResponseBody @GetMapping("/add") public int addUser(User user){ return userService.addUser(user); } @ResponseBody @GetMapping("/all") public Object findAllUser( @RequestParam(name = "pageNum", required = false, defaultValue = "1") int pageNum, @RequestParam(name = "pageSize", required = false, defaultValue = "10") int pageSize){ return userService.findAllUser(pageNum,pageSize); } }
最终的文件结构
在运行内嵌的service,启动程序
在浏览器里面请求测试
测试addUser接口:http://localhost:8080/user/add?username=猪八戒&password=123456&phone=150222222222
测试findAllUser接口:http://localhost:8080/user/all
接口写好了,写api也是个麻烦事,但是有了swagger,那就简单多了!
接下来开始整合swagger2
在pom.xml添加swagger的依赖
<dependency> <groupId>io.springfox</groupId> <artifactId>springfox-swagger2</artifactId> <version>2.2.2</version> </dependency> <dependency> <groupId>io.springfox</groupId> <artifactId>springfox-swagger-ui</artifactId> <version>2.2.2</version> </dependency>
在application.java同级添加swagger2.java,进行swagger的配置
swagger.java
@Configuration @EnableSwagger2 public class Swagger2 { @Bean public Docket createRestApi() { return new Docket(DocumentationType.SWAGGER_2) .apiInfo(apiInfo()) .select() .apis(RequestHandlerSelectors.basePackage("com.springboot.controller")) .paths(PathSelectors.any()) .build(); } private ApiInfo apiInfo() { return new ApiInfoBuilder() .title("Spring Boot中使用Swagger2构建RESTful APIs") .description("更多Spring Boot相关文章请关注:http://blog.didispace.com/") .termsOfServiceUrl("http://blog.didispace.com/") .contact("小太阳") .version("1.0") .build(); } }
basePackage("controller的包")
这样配置以后,访问http://localhost:8080/swagger-ui.html就已经可以看到文档了,但是这样的看起来很不友好,可以通过swagger的注解让文档更丰富,更直观
修改UserController.java
@Controller @RequestMapping(value = "/user") public class UserController { @Autowired private UserService userService; @ApiOperation(value="创建用户", notes="根据User对象创建用户") @ApiImplicitParam(name = "user", value = "用户详细实体user", required = true, dataType = "User") @ResponseBody @PostMapping("/add") public int addUser(@RequestBody User user){ return userService.addUser(user); } @ApiOperation(value="获取用户列表", notes="") @ResponseBody @GetMapping("/all") public Object findAllUser( @RequestParam(name = "pageNum", required = false, defaultValue = "1") int pageNum, @RequestParam(name = "pageSize", required = false, defaultValue = "10") int pageSize){ //开始分页 return userService.findAllUser(pageNum,pageSize); } }
添加了@ApiOperation 和@ApiImplicitParam两个注解
自己访问api的时候遇到的两个问题。
1.addUser的参数需要使用@RequestBody这样api里面的data type 会有参数模板
2.之前没有加@RequestBody使用的是get请求,加上以后需要使用post请求,主要post请求不能通过浏览器直接访问。
好了,运行项目,访问api接口
我们之前写好的两个接口已经显示出来了,点进去可以进行接口测试。
添加用户接口成功。
用户列表接口也成功了。