spring boot+mybatis搭建一個後端restfull服務的例項詳解
1、建立一個maven專案。
2、在pom.xml中引入依賴包，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，那麼首先需要建立資料表，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、然後配置資料庫連線池，這裡使用的是alibaba的druid，首先在resources中新建一個application.yml檔案，內容如下：
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、然後新建一個包com.best.db，並新建一個DruidDBConfig類，程式碼如下：
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: 資料連線池
*/
@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 物件為 Spring 容器所管理;
@Primary//表示這裡定義的DataSource將覆蓋其他來源的DataSource。
public DataSource dataSource(){
DruidDataSource datasource = new DruidDataSource();
datasource.setUrl(this.url);
datasource.setUsername(username);
datasource.setPassword(password);
datasource.setDriverClassName(driverClassName);
return datasource;
}
//配置資料庫事務
@Bean(name = "transactionManager")
public DataSourceTransactionManager dbOneTransactionManager(
@Qualifier("dataSource") DataSource dataSource) {
return new DataSourceTransactionManager(dataSource);
}
//配置資料庫工廠
@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、配置好連線池，那麼就可以開始配置entity了，也就是與表對映的實體類，這裡我們使用lombok的註解自動生成set和get方法，那麼新建一個com.best.entity包，並新建一個User類，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:使用者實體類
*/
@Data
@AllArgsConstructor
@NoArgsConstructor
public class User {
private Integer id;
private String name;
private Date createDate;
}
7、實體類建立好了之後，那麼就是建立mybatis對映檔案以及類了，這裡的對映介面檔案和Mapper.xml檔案放到一起，首先建立一個com.best.dbo包，對映介面檔案和.xml都放到這個包中，並建立一個介面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:使用者表的對映介面檔案
*/
@Repository
public interface UserMapper {
List<User> selectAll();
User selectById(Integer id);
}
8、配置Mapper對映的xml檔案，檔名為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、在配置好之後就可以在application.xml來指定mybatis掃描哪些對映檔案，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: #如果有多個目錄則可以寫多個，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，這裡同樣可以配置多個， type-aliases-package: com.best.dao server: port: 8080
10、配置好之後就開始配置service以及impl了，首先建立一個service和service/impl包，並在service下建立一個IUserService介面，並在impl下來實現該介面UserServiceImpl，程式碼如下：
package com.best.service;
import com.best.entity.User;
import java.util.List;
/**
* @author:sunxj
* @date:2020-11-10 21:33:23
* @description:使用者介面表
*/
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:使用者介面實現類
*/
@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、在建立好service後，需要建立一個controller，如UserController，程式碼如下：
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//使用此註解，那麼該類下的所有返回都是以json方式返回
@RequestMapping(value="best")//加上value後，在url訪問時必須加上/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、建立好之後，最後建立一個spring-boot的入口檔案，程式碼如下：
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、此時啟動會提示無法找到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、出現此問題是由於springboot在啟動時，在UserServiceImpl中又使用到了UserMapper的自動注入，而springboot啟動時就沒有掃描到UserMapper，更不可能將它作為bean注入到IOC容器中，因此就無法注入了，那麼需要再入口的main檔案上加上@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"})//如果有多個可以使用{"com.best.dao","com.best.sss.dao"}
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class,args);
}
}
15、此時即可正常啟動，如下圖所示：
16、此時在瀏覽器中輸入：http://localhost:8080/best/getUser即可，如下圖所示：
17、以上只是搭建一個可以正常通過url訪問，那麼現在來訪問資料庫中的記錄，在訪問之前先建立一些封裝類，比如將實體類封裝成json、返回狀態碼等，先建立一個common包，在該包下建立entity、enums、utils等包，如下圖所示：
18、然後在enums中建立一個ResultCode列舉類，此來定義了一些返回狀態碼資訊，如下程式碼所示：
package com.best.common.enums;
/**
* @author:sunxj
* @date:2020-11-10 22:08:11
* @description:返回碼定義
*/
public enum ResultCode {
//成功
SUCCESS(200,"成功"),//預設失敗
COMMON_FAIL(404,"失敗"),;
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會預設取出enum中的值物件列表，每個值都是一個ResultCode物件
if (ele.getCode().equals(code)) {
return ele.getMessage();
}
}
return null;
}
}
19、然後在entity中新建一個JsonResult類，用來封裝統一返回的實體類，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:統一返回的實體類
*/
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、然後在utils中新建一個ResultTool，如下程式碼所示：
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返回構造工具
*/
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、建立好這些之後，那麼就可以開始在controller中進行構造了，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//使用此註解，那麼該類下的所有返回都是以json方式返回
@RequestMapping(value="best")//加上value後，在url訪問時必須加上/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、重新啟動springboot，然後輸入：http://localhost:8080/best/getUser，此時頁面會出現如下錯誤：
23、後臺顯示如下錯誤：
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//使用此註解，那麼該類下的所有返回都是以json方式返回
@RequestMapping(value="best")//加上value後，在url訪問時必須加上/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、這意思就是沒有找到UserMapper介面檔案中的selectAll方法，也就是沒有和*Mapper.xml匹配成功，這是由於我們將.xml檔案和java檔案放在了java目錄，而通過maven來管理，它不會將java檔案中的xml檔案打包進去的，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、然後在此重新執行，重新輸入網址即可，如下圖所示：
25、到此即可搭建完畢，使用此方法可以搭建一個前後端完全分離通過json通訊的springboot後臺。
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