spring boot+mybatis搭建一个后端restfull服务的实例详解

1、创建一个maven项目。

2、在pom.xml中引入依赖包，如下所示：

<?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.best</groupId>
 <artifactId>spring-boot-mybatis</artifactId>
 <version>1.0-SNAPSHOT</version>
 
 <properties>
  <java.version>1.8</java.version>
  <fastjson.version>1.2.74</fastjson.version>
  <spring.version>5.3.5.RELEASE</spring.version>
  <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
 </properties>
 <parent>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-parent</artifactId>
  <version>2.3.5.RELEASE</version>
 </parent>
 <dependencies>
  <dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-web</artifactId>
  </dependency>
  <dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-test</artifactId>
   <scope>test</scope>
  </dependency>
  <dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-jdbc</artifactId>
   <exclusions>
    <!-- 排除 tomcat-jdbc 以使用 HikariCP -->
    <exclusion>
     <groupId>org.apache.tomcat</groupId>
     <artifactId>tomcat-jdbc</artifactId>
    </exclusion>
   </exclusions>
  </dependency>
  <!--  <dependency>-->
  <!--   <groupId>org.springframework.boot</groupId>-->
  <!--   <artifactId>spring-boot-starter-security</artifactId>-->
  <!--  </dependency>-->
  <dependency>
   <groupId>org.mybatis.spring.boot</groupId>
   <artifactId>mybatis-spring-boot-starter</artifactId>
   <version>2.1.3</version>
  </dependency>
  <dependency>
   <groupId>mysql</groupId>
   <artifactId>mysql-connector-java</artifactId>
   <version>8.0.22</version>
  </dependency>
  <dependency>
   <groupId>com.alibaba</groupId>
   <artifactId>druid</artifactId>
   <version>1.2.1</version>
  </dependency>
  <dependency>
   <groupId>com.alibaba</groupId>
   <artifactId>fastjson</artifactId>
   <version>${fastjson.version}</version>
  </dependency>
  <dependency>
   <groupId>org.projectlombok</groupId>
   <artifactId>lombok</artifactId>
   <version>1.18.10</version>
  </dependency>
  <dependency>
   <groupId>org.mybatis.spring.boot</groupId>
   <artifactId>mybatis-spring-boot-starter</artifactId>
   <version>2.1.3</version>
  </dependency>
 </dependencies>
 <build>
  <plugins>
   <plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-compiler-plugin</artifactId>
    <version>3.8.0</version>
    <configuration>
     <source>1.8</source>
     <target>1.8</target>
    </configuration>
   </plugin>
  </plugins>
 </build>
</project>

3、在使用mybatis之前，那么首先需要创建数据表，如：

DROP TABLE IF EXISTS `user`;
CREATE TABLE `user` (
 `id` int(11) NOT NULL AUTO_INCREMENT,
 `name` varchar(255) COLLATE utf8_bin DEFAULT NULL,
 `create_date` datetime DEFAULT NULL,
 PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8 COLLATE=utf8_bin;
 
-- ----------------------------
-- Records of user
-- ----------------------------
INSERT INTO `user` VALUES ('1', 'user1', '2020-11-10 21:01:54');
INSERT INTO `user` VALUES ('2', 'user2', '2020-11-01 21:02:12');

4、然后配置数据库连接池，这里使用的是alibaba的druid，首先在resources中新建一个application.yml文件，内容如下：

spring:
 datasource:
 type: com.alibaba.druid.pool.DruidDataSource
 driver-class-name: com.mysql.cj.jdbc.Driver
 platform: mysql
 url: jdbc:mysql://localhost:3306/springboottest?useUnicode=true&characterEncoding=UTF-8&useSSL=false&serverTimezone=CTT
 username: root
 password:
server:
 port: 8080

5、然后新建一个包com.best.db，并新建一个DruidDBConfig类，代码如下：

package com.best.db;
 
import com.alibaba.druid.pool.DruidDataSource;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
 
import javax.sql.DataSource;
 
/**
 * @author:sunxj
 * @date:2020-11-10 21:08:53
 * @description: 数据连接池
 */
@Configuration
public class DruidDBConfig {
 @Value("${spring.datasource.url}")
 private String url;
 @Value("${spring.datasource.username}")
 private String username;
 @Value("${spring.datasource.password}")
 private String password;
 @Value("${spring.datasource.driver-class-name}")
 private String driverClassName;
 @Bean//DataSource 对象为 Spring 容器所管理;
 @Primary//表示这里定义的DataSource将覆盖其他来源的DataSource。
 public DataSource dataSource(){
  DruidDataSource datasource = new DruidDataSource();
  datasource.setUrl(this.url);
  datasource.setUsername(username);
  datasource.setPassword(password);
  datasource.setDriverClassName(driverClassName);
  return datasource;
 }
 //配置数据库事务
 @Bean(name = "transactionManager")
 public DataSourceTransactionManager dbOneTransactionManager(
   @Qualifier("dataSource") DataSource dataSource) {
  return new DataSourceTransactionManager(dataSource);
 }
 //配置数据库工厂
 @Bean(name = "sqlSessionFactory")
 @ConditionalOnMissingBean(name = "sqlSessionFactory")
 public SqlSessionFactory dbOneSqlSessionFactory(@Qualifier("dataSource") DataSource dataSource) throws Exception {
  final SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();
  sessionFactory.setDataSource(dataSource);
  return sessionFactory.getObject();
 }
}

6、配置好连接池，那么就可以开始配置entity了，也就是与表映射的实体类，这里我们使用lombok的注解自动生成set和get方法，那么新建一个com.best.entity包，并新建一个User类，如：

package com.best.entity;
 
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import java.util.Date;
 
/**
 * @author:sunxj
 * @date:2020-11-10 21:12:58
 * @description:用户实体类
 */
@Data
@AllArgsConstructor
@NoArgsConstructor
public class User {
 private Integer id;
 private String name;
 private Date createDate;
}

7、实体类创建好了之后，那么就是创建mybatis映射文件以及类了，这里的映射接口文件和Mapper.xml文件放到一起，首先创建一个com.best.dbo包，映射接口文件和.xml都放到这个包中，并创建一个接口UserMapper，如：

package com.best.dao;
 
import com.best.entity.User;
import org.springframework.stereotype.Repository;
 
import java.util.List;
/**
 * @author:sunxj
 * @date:2020-11-10 21:17:27
 * @description:用户表的映射接口文件
 */
@Repository
public interface UserMapper {
 List<User> selectAll();
 User selectById(Integer id);
}

8、配置Mapper映射的xml文件，文件名为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.best.dao.UserMapper">
 <resultMap type="com.best.entity.User" id="UserMap">
  <result property="id" column="id" jdbcType="INTEGER"></result>
  <result property="name" column="name" jdbcType="VARCHAR"></result>
  <result property="createDate" column="create_date" jdbcType="TIMESTAMP"></result>
 </resultMap>
 <select id="selectAll" resultMap="UserMap">
  SELECT * FROM user
 </select>
 <select id="selectById" resultMap="UserMap">
  SELECT * FROM user WHERE id=#{id}
 </select>
</mapper>

9、在配置好之后就可以在application.xml来指定mybatis扫描哪些映射文件，配置如下：

spring:
 datasource:
 type: com.alibaba.druid.pool.DruidDataSource
 driver-class-name: com.mysql.cj.jdbc.Driver
 platform: mysql
 url: jdbc:mysql://localhost:3306/springboottest?useUnicode=true&characterEncoding=UTF-8&useSSL=false&serverTimezone=CTT
 username: root
 password:
mybatis:
 #如果有多个目录则可以写多个，比如com/best/dao/*.xml，com/best/*/dao/*.xml,com/best/*/sss/*/dao/*.xml
 mapper-locations: classpath:com/best/dao/*.xml
 #配置包，这里同样可以配置多个，
 type-aliases-package: com.best.dao
server:
 port: 8080

10、配置好之后就开始配置service以及impl了，首先创建一个service和service/impl包，并在service下创建一个IUserService接口，并在impl下来实现该接口UserServiceImpl，代码如下：

package com.best.service;
 
import com.best.entity.User;
import java.util.List;
/**
 * @author:sunxj
 * @date:2020-11-10 21:33:23
 * @description:用户接口表
 */
public interface IUserService {
 List<User> selectAll();
 User selectById(Integer id);
}

package com.best.service.impl;
 
import com.best.dao.UserMapper;
import com.best.entity.User;
import com.best.service.IUserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
 
import java.util.List;
 
/**
 * @author:sunxj
 * @date:2020-11-10 21:34:34
 * @description:用户接口实现类
 */
@Service("userService")
public class UserServiceImpl implements IUserService {
 @Autowired
 private UserMapper userMapper;
 @Override
 public List<User> selectAll() {
  return userMapper.selectAll();
 }
 
 @Override
 public User selectById(Integer id) {
  return userMapper.selectById(id);
 }
}

11、在创建好service后，需要创建一个controller，如UserController，代码如下：

package com.best.controller;
 
import com.alibaba.fastjson.JSONObject;
import com.best.service.IUserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
/**
 * @author:sunxj
 * @date:2020-11-10 21:38:09
 * @description:
 */
@RestController//使用此注解，那么该类下的所有返回都是以json方式返回
@RequestMapping(value="best")//加上value后，在url访问时必须加上/best才行
public class UserController {
 @Autowired
 private IUserService userService;
 @RequestMapping("/getUser")
 public JSONObject getUser(HttpServletRequest request, HttpServletResponse response) {
  JSONObject obj = new JSONObject();
  obj.put("user","1111");
  return obj;
 }
}

12、创建好之后，最后创建一个spring-boot的入口文件，代码如下：

package com.best;
 
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
 
/**
 * @author:sunxj
 * @date:2020-11-10 21:46:43
 * @description:
 */
@SpringBootApplication
public class Application {
 public static void main(String[] args) {
  SpringApplication.run(Application.class,args);
 }
}

13、此时启动会提示无法找到com.best.dao.UserMapper，如：

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2020-11-10 21:48:21.635 ERROR 10320 --- [   main] o.s.b.d.LoggingFailureAnalysisReporter : 
 
***************************
APPLICATION FAILED TO START
***************************
 
Description:
 
Field userMapper in com.best.service.impl.UserServiceImpl required a bean of type 'com.best.dao.UserMapper' that could not be found.
 
The injection point has the following annotations:
	- @org.springframework.beans.factory.annotation.Autowired(required=true)
 
 
Action:
 
Consider defining a bean of type 'com.best.dao.UserMapper' in your configuration.

14、出现此问题是由于springboot在启动时，在UserServiceImpl中又使用到了UserMapper的自动注入，而springboot启动时就没有扫描到UserMapper，更不可能将它作为bean注入到IOC容器中，因此就无法注入了，那么需要再入口的main文件上加上@MapperScan即可，如：

package com.best;
 
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
 
/**
 * @author:sunxj
 * @date:2020-11-10 21:46:43
 * @description:
 */
@SpringBootApplication
@MapperScan({"com.best.dao"})//如果有多个可以使用{"com.best.dao","com.best.sss.dao"}
public class Application {
 public static void main(String[] args) {
  SpringApplication.run(Application.class,args);
 }
}

15、此时即可正常启动，如下图所示：

16、此时在浏览器中输入：http://localhost:8080/best/getUser即可，如下图所示：

17、以上只是搭建一个可以正常通过url访问，那么现在来访问数据库中的记录，在访问之前先创建一些封装类，比如将实体类封装成json、返回状态码等，先创建一个common包，在该包下创建entity、enums、utils等包，如下图所示：

18、然后在enums中创建一个ResultCode枚举类，此来定义了一些返回状态码信息，如下代码所示：

package com.best.common.enums;
 
/**
 * @author:sunxj
 * @date:2020-11-10 22:08:11
 * @description:返回码定义
 */
public enum ResultCode {
 //成功
 SUCCESS(200,"成功"),
 //默认失败
 COMMON_FAIL(404,"失败"),
 ;
 private Integer code;
 private String message;
 
 ResultCode(Integer code, String message) {
  this.code = code;
  this.message = message;
 }
 
 public Integer getCode() {
  return code;
 }
 
 public void setCode(Integer code) {
  this.code = code;
 }
 
 public String getMessage() {
  return message;
 }
 
 public void setMessage(String message) {
  this.message = message;
 }
 
 public static String getMessageByCode(Integer code) {
  for (ResultCode ele : values()) { //values会默认取出enum中的值对象列表，每个值都是一个ResultCode对象
   if (ele.getCode().equals(code)) {
    return ele.getMessage();
   }
  }
  return null;
 }
}

19、然后在entity中新建一个JsonResult类，用来封装统一返回的实体类，如：

package com.best.common.entity;
 
import com.best.common.enums.ResultCode;
 
import java.io.Serializable;
 
/**
 * @author:sunxj
 * @date:2020-11-10 22:06:50
 * @description:统一返回的实体类
 */
public class JsonResult<T> implements Serializable {
 private Boolean success;
 private Integer errorCode;
 private String errorMsg;
 private T data;
 
 public JsonResult() {
 }
 
 public JsonResult(Boolean success) {
  this.success = success;
  this.errorCode = success ? ResultCode.SUCCESS.getCode():ResultCode.COMMON_FAIL.getCode();
  this.errorMsg = success ? ResultCode.SUCCESS.getMessage():ResultCode.COMMON_FAIL.getMessage();
 }
 public JsonResult(Boolean success,ResultCode resultCode) {
  this.success = success;
  this.errorCode = success ? ResultCode.SUCCESS.getCode():(resultCode == null ? ResultCode.COMMON_FAIL.getCode():resultCode.getCode());
  this.errorMsg = success ? ResultCode.SUCCESS.getMessage():(resultCode == null ? ResultCode.COMMON_FAIL.getMessage():resultCode.getMessage());
 }
 public JsonResult(Boolean success,T data) {
  this.success = success;
  this.errorCode = success ? ResultCode.SUCCESS.getCode():ResultCode.COMMON_FAIL.getCode();
  this.errorMsg = success ? ResultCode.SUCCESS.getMessage() : ResultCode.COMMON_FAIL.getMessage();
  this.data = data;
 }
 public JsonResult(Boolean success,ResultCode resultCode,T data) {
  this.success = success;
  this.errorCode = success ? ResultCode.SUCCESS.getCode():(resultCode == null ? ResultCode.COMMON_FAIL.getCode():resultCode.getCode());
  this.errorMsg = success ? ResultCode.SUCCESS.getMessage():(resultCode == null ? ResultCode.COMMON_FAIL.getMessage():resultCode.getMessage());
  this.data = data;
 }
 
 public Boolean getSuccess() {
  return success;
 }
 
 public void setSuccess(Boolean success) {
  this.success = success;
 }
 
 public Integer getErrorCode() {
  return errorCode;
 }
 
 public void setErrorCode(Integer errorCode) {
  this.errorCode = errorCode;
 }
 
 public String getErrorMsg() {
  return errorMsg;
 }
 
 public void setErrorMsg(String errorMsg) {
  this.errorMsg = errorMsg;
 }
 
 public T getData() {
  return data;
 }
 
 public void setData(T data) {
  this.data = data;
 }
}

20、然后在utils中新建一个ResultTool，如下代码所示：

package com.best.common.utils;
 
import com.best.common.entity.JsonResult;
import com.best.common.enums.ResultCode;
 
/**
 * @author:sunxj
 * @date:2020-11-10 22:11:03
 * @description:json返回构造工具
 */
public class ResultTool {
 public static JsonResult success() {
  return new JsonResult(true);
 }
 public static <T> JsonResult<T> success(T data) {
  return new JsonResult<>(true,data);
 }
 public static JsonResult fail() {
  return new JsonResult(false);
 }
 public static JsonResult fail(ResultCode resultCode) {
  return new JsonResult(false,resultCode);
 }
}

21、创建好这些之后，那么就可以开始在controller中进行构造了，controller如下：

package com.best.controller;
 
import com.best.common.entity.JsonResult;
import com.best.common.utils.ResultTool;
import com.best.entity.User;
import com.best.service.IUserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.List;
 
/**
 * @author:sunxj
 * @date:2020-11-10 21:38:09
 * @description:
 */
@RestController//使用此注解，那么该类下的所有返回都是以json方式返回
@RequestMapping(value="best")//加上value后，在url访问时必须加上/best才行
public class UserController {
 @Autowired
 private IUserService userService;
 @RequestMapping("/getUser")
 public JsonResult getUser(HttpServletRequest request, HttpServletResponse response) {
  List<User> users = userService.selectAll();
  return ResultTool.success(users);
 }
}

22、重新启动springboot，然后输入：http://localhost:8080/best/getUser，此时页面会出现如下错误：

23、后台显示如下错误：

package com.best.controller;
 
import com.best.common.entity.JsonResult;
import com.best.common.utils.ResultTool;
import com.best.entity.User;
import com.best.service.IUserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.List;
 
/**
 * @author:sunxj
 * @date:2020-11-10 21:38:09
 * @description:
 */
@RestController//使用此注解，那么该类下的所有返回都是以json方式返回
@RequestMapping(value="best")//加上value后，在url访问时必须加上/best才行
public class UserController {
 @Autowired
 private IUserService userService;
 @RequestMapping("/getUser")
 public JsonResult getUser(HttpServletRequest request, HttpServletResponse response) {
  List<User> users = userService.selectAll();
  return ResultTool.success(users);
 }
}

23、这意思就是没有找到UserMapper接口文件中的selectAll方法，也就是没有和*Mapper.xml匹配成功，这是由于我们将.xml文件和java文件放在了java目录，而通过maven来管理，它不会将java文件中的xml文件打包进去的，因此需要再pom中的build中指定，如：

2020-11-10 22:15:10.487 ERROR 12992 --- [nio-8080-exec-4] o.a.c.c.C.[.[.[/].[dispatcherServlet]    : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): com.best.dao.UserMapper.selectAll] with root cause
org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): com.best.dao.UserMapper.selectAll
 at org.apache.ibatis.binding.MapperMethod$SqlCommand.<init>(MapperMethod.java:235) ~[mybatis-3.5.5.jar:3.5.5]
 at org.apache.ibatis.binding.MapperMethod.<init>(MapperMethod.java:53) ~[mybatis-3.5.5.jar:3.5.5]
 at org.apache.ibatis.binding.MapperProxy.lambda$cachedInvoker$0(MapperProxy.java:115) ~[mybatis-3.5.5.jar:3.5.5]
 at java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1660) ~[na:1.8.0_261]
 at org.apache.ibatis.binding.MapperProxy.cachedInvoker(MapperProxy.java:102) ~[mybatis-3.5.5.jar:3.5.5]
 at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:85) ~[mybatis-3.5.5.jar:3.5.5]
 at com.sun.proxy.$Proxy57.selectAll(Unknown Source) ~[na:na]
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_261]
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_261]
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_261]
 at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_261]
 at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:344) ~[spring-aop-5.2.10.RELEASE.jar:5.2.10.RELEASE]
 at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:198) ~[spring-aop-5.2.10.RELEASE.jar:5.2.10.RELEASE]
 at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163) ~[spring-aop-5.2.10.RELEASE.jar:5.2.10.RELEASE]
 at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:139) ~[spring-tx-5.2.10.RELEASE.jar:5.2.10.RELEASE]
 at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.2.10.RELEASE.jar:5.2.10.RELEASE]
 at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:212) ~[spring-aop-5.2.10.RELEASE.jar:5.2.10.RELEASE]
 at com.sun.proxy.$Proxy58.selectAll(Unknown Source) ~[na:na]
 at com.best.service.impl.UserServiceImpl.selectAll(UserServiceImpl.java:22) ~[classes/:na]
 at com.best.controller.UserController.getUser(UserController.java:26) ~[classes/:na]
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_261]
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_261]
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_261]
 at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_261]
 at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:190) ~[spring-web-5.2.10.RELEASE.jar:5.2.10.RELEASE]
 at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138) ~[spring-web-5.2.10.RELEASE.jar:5.2.10.RELEASE]
 at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:105) ~[spring-webmvc-5.2.10.RELEASE.jar:5.2.10.RELEASE]
 at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:878) ~[spring-webmvc-5.2.10.RELEASE.jar:5.2.10.RELEASE]
 at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:792) ~[spring-webmvc-5.2.10.RELEASE.jar:5.2.10.RELEASE]
 at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.2.10.RELEASE.jar:5.2.10.RELEASE]
 at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040) ~[spring-webmvc-5.2.10.RELEASE.jar:5.2.10.RELEASE]
 at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943) ~[spring-webmvc-5.2.10.RELEASE.jar:5.2.10.RELEASE]
 at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.2.10.RELEASE.jar:5.2.10.RELEASE]
 at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898) ~[spring-webmvc-5.2.10.RELEASE.jar:5.2.10.RELEASE]
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:626) ~[tomcat-embed-core-9.0.39.jar:4.0.FR]
 at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.2.10.RELEASE.jar:5.2.10.RELEASE]
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:733) ~[tomcat-embed-core-9.0.39.jar:4.0.FR]
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[tomcat-embed-core-9.0.39.jar:9.0.39]
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.39.jar:9.0.39]
 at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.39.jar:9.0.39]
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.39.jar:9.0.39]
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.39.jar:9.0.39]
 at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.2.10.RELEASE.jar:5.2.10.RELEASE]
 at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.10.RELEASE.jar:5.2.10.RELEASE]
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.39.jar:9.0.39]
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.39.jar:9.0.39]
 at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.2.10.RELEASE.jar:5.2.10.RELEASE]
 at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.10.RELEASE.jar:5.2.10.RELEASE]
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.39.jar:9.0.39]
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.39.jar:9.0.39]
 at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.2.10.RELEASE.jar:5.2.10.RELEASE]
 at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.10.RELEASE.jar:5.2.10.RELEASE]
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.39.jar:9.0.39]
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.39.jar:9.0.39]
 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) ~[tomcat-embed-core-9.0.39.jar:9.0.39]
 at org.apache.catalina.core.StandardContextValve.__invoke(StandardContextValve.java:97) [tomcat-embed-core-9.0.39.jar:9.0.39]
 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:41002) [tomcat-embed-core-9.0.39.jar:9.0.39]
 at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:542) [tomcat-embed-core-9.0.39.jar:9.0.39]
 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143) [tomcat-embed-core-9.0.39.jar:9.0.39]
 at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) [tomcat-embed-core-9.0.39.jar:9.0.39]
 at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78) [tomcat-embed-core-9.0.39.jar:9.0.39]
 at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) [tomcat-embed-core-9.0.39.jar:9.0.39]
 at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:374) [tomcat-embed-core-9.0.39.jar:9.0.39]
 at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) [tomcat-embed-core-9.0.39.jar:9.0.39]
 at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868) [tomcat-embed-core-9.0.39.jar:9.0.39]
 at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1590) [tomcat-embed-core-9.0.39.jar:9.0.39]
 at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-9.0.39.jar:9.0.39]
 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_261]
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_261]
 at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-9.0.39.jar:9.0.39]
 at java.lang.Thread.run(Thread.java:748) [na:1.8.0_261]

24、然后在此重新运行，重新输入网址即可，如下图所示：

25、到此即可搭建完毕，使用此方法可以搭建一个前后端完全分离通过json通信的springboot后台。

到此这篇关于spring boot+mybatis搭建一个后端restfull服务的文章就介绍到这了,更多相关spring boot+mybatis搭建restfull服务内容请搜索呐喊教程以前的文章或继续浏览下面的相关文章希望大家以后多多支持呐喊教程！

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