Springboot——restful实践后端

迈不过友情╰ 2023-07-17 05:58 7阅读 0赞

### Springboot——restful实践后端 ###

*   *   *  数据库文件
         *   *  插入数据
         *  项目结构
         *  配置文件
         *  启动
         *  工具类utils
         *  mapper
         *  service
         *  filter
         *  config
         *  controller
         *  问题日志

### 数据库文件 ###

--- 创建数据库
    CREATE DATABASE IF NOT EXISTS  `db_test`;
    USE db_test;
    -- 管理员表
    CREATE TABLE IF NOT EXISTS `admin`
    (
        `aid` INT  NOT NULL AUTO_INCREMENT COMMENT '管理员账号id',
        `name` VARCHAR(20) NOT NULL  COMMENT  '管理员账号id',
        `pwd` VARCHAR(20)  NOT NULL COMMENT '管理员密码',
        PRIMARY KEY `pk_aid` (`aid`)
    ) ENGINE = InnoDB;
    
    -- 用户表
    CREATE TABLE IF NOT EXISTS `user`
    (
        `id` INT  NOT NULL AUTO_INCREMENT COMMENT '用户id',
        `username` VARCHAR(20)  NOT NULL COMMENT '账户名',
        `password` VARCHAR(20) NOT NULL COMMENT '密码',
        `sex` CHAR(1) DEFAULT 'M' COMMENT '性别M nan F 女',
        `birth` DATE COMMENT '出生日期',
        PRIMARY KEY `pk_uid` (`id`)
    ) ENGINE = InnoDB;
    
    INSERT INTO admin VALUES (null,'admin','admin');
    
    SELECT * FROM admin;

#### 插入数据 ####

[随机生成数据网站][Link 1]

insert into user (id, username, password, sex, birth) values (1, 'cogles0', 'g9saZ4BJ9Xn', 'M', '2009-06-11');
    insert into user (id, username, password, sex, birth) values (2, 'kboor1', 'QxTltEzxz', 'F', '2005-06-23');
    insert into user (id, username, password, sex, birth) values (3, 'llongfield2', '5e7TH6lplp', 'F', '2006-05-16');
    insert into user (id, username, password, sex, birth) values (4, 'drosentholer3', 'g4f0ZKImxv', 'F', '2016-10-05');
    insert into user (id, username, password, sex, birth) values (5, 'asilverthorne4', 'Z5UjjX3', 'M', '2011-11-24');
    insert into user (id, username, password, sex, birth) values (6, 'ndigan5', 'UC7pnoJW', 'M', '2013-01-09');
    insert into user (id, username, password, sex, birth) values (7, 'mbriddock6', '8Ujnm0c0', 'F', '2019-06-30');
    insert into user (id, username, password, sex, birth) values (8, 'dsueter7', 'LpluQlPoN2kl', 'F', '2018-02-08');
    insert into user (id, username, password, sex, birth) values (9, 'eberzons8', 'GsEG3O1USej', 'F', '2017-08-27');
    insert into user (id, username, password, sex, birth) values (10, 'mkelmere9', 'gjyWR8f9f9', 'M', '2010-06-19');
    
    SELECT * FROM user;

### 项目结构 ###

*  pom.xml

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
        <modelVersion>4.0.0</modelVersion>
        <parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>2.2.5.RELEASE</version>
            <relativePath/> 
        </parent>
        <groupId>com.antRain</groupId>
        <artifactId>restful</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <name>restful</name>
        <description>Demo project for Spring Boot</description>
    
        <properties>
            <java.version>1.8</java.version>
        </properties>
    
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-thymeleaf</artifactId>
                <exclusions>
                    <exclusion>
                        <artifactId>spring-boot-starter-logging</artifactId>
                        <groupId>org.springframework.boot</groupId>
                    </exclusion>
                </exclusions>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
                <exclusions> 
                    <exclusion>
                        <artifactId>org.springframework.boot</artifactId>
                        <groupId>spring.boot.starter-logging</groupId>
                    </exclusion>
            </exclusions>
        </dependency>
            <dependency>
                <groupId>org.mybatis.spring.boot</groupId>
                <artifactId>mybatis-spring-boot-starter</artifactId>
                <version>2.1.2</version>
            </dependency>
    
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-devtools</artifactId>
                <scope>runtime</scope>
                <optional>true</optional>
            </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>
                <exclusions>
                    <exclusion>
                        <groupId>org.junit.vintage</groupId>
                        <artifactId>junit-vintage-engine</artifactId>
                    </exclusion>
                </exclusions>
            </dependency>
    
            
            <dependency>
                <groupId>com.github.penggle</groupId>
                <artifactId>kaptcha</artifactId>
                <version>2.3.2</version>
            </dependency>
    
            
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-log4j2</artifactId>
            </dependency>
    
        </dependencies>
    
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                    <configuration>
                        
                        <fork>true</fork>
                        <addResources>true</addResources>
                    </configuration>
                </plugin>
            </plugins>
        </build>
    
    </project>

*  java文件  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMTQ2NjUw_size_16_color_FFFFFF_t_70]
 *  资源文件  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQxMTQ2NjUw_size_16_color_FFFFFF_t_70 1]

### 配置文件 ###

*  application.properties

#配置端口号
    server.port = 8080
    server.tomcat.uri-encoding=UTF-8
    
    #禁用缓存
    spring.thymeleaf.cache=false
    spring.thymeleaf.encoding=UTF-8
    
    
    #配置数据源
    spring.datasource.name=springboot-site-datasource
    spring.datasource.driverClassName=com.mysql.cj.jdbc.Driver
    spring.datasource.url=jdbc:mysql://localhost:3306/db_test?useUnicode=true&characterEncoding=utf8&autoReconnect=true&useSSL=false&serverTimezone=UTC
    spring.datasource.username=root
    spring.datasource.password=654321
    
    
    #需要实时更新的目录
    spring.devtools.restart.enabled=true
    spring.devtools.restart.additional-paths=resources/**,static/**,templates/**
    
    #配置mapper映射文件
    #mybatis.mapper-locations=classpath:mapper/*Mapper.xml
    #mybatis.type-aliases-package=com.antrain.play.bean
    
    
    spring.jackson.date-format=yyyy-MM-dd 
    spring.jackson.time-zone=GMT+8
    
    mybatis.configuration.log-prefix=org.apache.ibatis.logging.log4j2.Log4j2Impl
    
    # 指定log4j2作为日志记录
    logging.config= classpath:log4j2-dev.xml
    logging.level.com.antrain.restful.mapper =
    
    
    # 版本需要手动开启配置 restful put delete 有效
    spring.mvc.hiddenmethod.filter.enabled = true

*  log4j2-dev.xml  
    [参考博客][Link 2]

<?xml version="1.0" encoding="UTF-8"?>
            
            
    <configuration monitorInterval="5">
    
    
    <Properties>
        
        
        <property name="LOG_PATTERN" value="%date{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n" />
        
        <property name="FILE_PATH" value="./logs/" />
        <property name="FILE_NAME" value="lipstick_backend" />
    </Properties>
    
    <appenders>
    
        <console name="Console" target="SYSTEM_OUT">
            
            <PatternLayout pattern="${LOG_PATTERN}"/>
            
            <ThresholdFilter level="info" onMatch="ACCEPT" onMismatch="DENY"/>
        </console>
    
        
        <File name="Filelog" fileName="${FILE_PATH}/test.log" append="false">
            <PatternLayout pattern="${LOG_PATTERN}"/>
        </File>
    
        
        <RollingFile name="RollingFileInfo" fileName="${FILE_PATH}/info.log" filePattern="${FILE_PATH}/${FILE_NAME}-INFO-%d{yyyy-MM-dd}_%i.log.gz">
            
            <ThresholdFilter level="info" onMatch="ACCEPT" onMismatch="DENY"/>
            <PatternLayout pattern="${LOG_PATTERN}"/>
            <Policies>
                
                <TimeBasedTriggeringPolicy interval="1"/>
                <SizeBasedTriggeringPolicy size="10MB"/>
            </Policies>
            
            <DefaultRolloverStrategy max="15"/>
        </RollingFile>
    
        
        <RollingFile name="RollingFileWarn" fileName="${FILE_PATH}/warn.log" filePattern="${FILE_PATH}/${FILE_NAME}-WARN-%d{yyyy-MM-dd}_%i.log.gz">
            
            <ThresholdFilter level="warn" onMatch="ACCEPT" onMismatch="DENY"/>
            <PatternLayout pattern="${LOG_PATTERN}"/>
            <Policies>
                
                <TimeBasedTriggeringPolicy interval="1"/>
                <SizeBasedTriggeringPolicy size="10MB"/>
            </Policies>
            
            <DefaultRolloverStrategy max="15"/>
        </RollingFile>
    
        
        <RollingFile name="RollingFileError" fileName="${FILE_PATH}/error.log" filePattern="${FILE_PATH}/${FILE_NAME}-ERROR-%d{yyyy-MM-dd}_%i.log.gz">
            
            <ThresholdFilter level="error" onMatch="ACCEPT" onMismatch="DENY"/>
            <PatternLayout pattern="${LOG_PATTERN}"/>
            <Policies>
                
                <TimeBasedTriggeringPolicy interval="1"/>
                <SizeBasedTriggeringPolicy size="10MB"/>
            </Policies>
            
            <DefaultRolloverStrategy max="15"/>
        </RollingFile>
    </appenders>
    
    
    
    <loggers>
        
        <logger name="org.mybatis" level="info" additivity="false">
            <AppenderRef ref="Console"/>
        </logger>
    
        
        
        <Logger name="org.springframework" level="info" additivity="false">
            <AppenderRef ref="Console"/>
        </Logger>
    
        
        <logger name="org.apache.ibatis" level="DEBUG"/>
        <logger name="java.sql.Connection" level="DEBUG"/>
        <logger name="java.sql.Statement" level="DEBUG"/>
        <logger name="java.sql.PreparedStatement" level="DEBUG"/>
    
        <root level="info">
            <appender-ref ref="Console"/>
            <appender-ref ref="Filelog"/>
            <appender-ref ref="RollingFileInfo"/>
            <appender-ref ref="RollingFileWarn"/>
            <appender-ref ref="RollingFileError"/>
        </root>
    </loggers>
    </configuration>

### 启动 ###

package com.antrain.restful;
    
    import org.mybatis.spring.annotation.MapperScan;
    import org.springframework.boot.Banner;
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    
    @MapperScan("com.antrain.restful.mapper")
    @SpringBootApplication
    public class RestfulApplication { 
    
        public static void main(String[] args) { 
            SpringApplication application = new SpringApplication(RestfulApplication.class);
            application.setBannerMode(Banner.Mode.OFF);//关闭
            application.run(args);
        }
    
    }

### 工具类utils ###

*  PageResult

package com.antrain.restful.util;
    
    import java.io.Serializable;
    import java.util.List;
    
    public class PageResult implements Serializable { 
        private int totalCount; //总记录数
        private int pageSize; //每页记录数
        private int totalPage;//总页数
        private int currPage;//当前页数
        private List<?> list;//列表数据
        /** * 分页 * * @param list 列表数据 * @param totalCount 总记录数 * @param pageSize 每页记录数 * @param currPage 当前页数 */
        public PageResult(List<?> list, int totalCount, int pageSize, int currPage) { 
            this.list = list;
            this.totalCount = totalCount;
            this.pageSize = pageSize;
            this.currPage = currPage;
            this.totalPage = (int) Math.ceil((double) totalCount / pageSize);
        }
    
        public int getTotalCount() { 
            return totalCount;
        }
    
        public void setTotalCount(int totalCount) { 
            this.totalCount = totalCount;
        }
    
        public int getPageSize() { 
            return pageSize;
        }
    
        public void setPageSize(int pageSize) { 
            this.pageSize = pageSize;
        }
    
        public int getTotalPage() { 
            return totalPage;
        }
    
        public void setTotalPage(int totalPage) { 
            this.totalPage = totalPage;
        }
    
        public int getCurrPage() { 
            return currPage;
        }
    
        public void setCurrPage(int currPage) { 
            this.currPage = currPage;
        }
    
        public List<?> getList() { 
            return list;
        }
    
        public void setList(List<?> list) { 
            this.list = list;
        }
    
        @Override
        public String toString() { 
            return "PageResult{" +
                    "totalCount=" + totalCount +
                    ", pageSize=" + pageSize +
                    ", totalPage=" + totalPage +
                    ", currPage=" + currPage +
                    ", list=" + list +
                    '}';
        }
    }

*  PageUtil

package com.antrain.restful.util;
    
    import java.util.LinkedHashMap;
    import java.util.Map;
    
    public class PageUtil extends LinkedHashMap<String, Object> { 
        private int offset;//偏移量
        private int page;//当前页码
        private int limit;//每页条数
    
        public PageUtil(Map<String, Object> params) { 
            this.putAll(params);
    
            //分页参数
            this.offset = Integer.parseInt(params.get("offset").toString());
            this.limit = Integer.parseInt(params.get("limit").toString());
            this.page = offset/(limit+1);
            this.put("offset", offset);
            this.put("page", page);
            this.put("limit", limit);
        }
    
    
        public int getPage() { 
            return page;
        }
    
        public void setPage(int page) { 
            this.page = page;
        }
    
        public int getLimit() { 
            return limit;
        }
    
        public void setLimit(int limit) { 
            this.limit = limit;
        }
    
        public int getOffset() { 
            return offset;
        }
    
        public void setOffset(int offset) { 
            this.offset = offset;
        }
    
        @Override
        public String toString() { 
            return "PageUtil{" +
                    "offset=" + offset +
                    ", page=" + page +
                    ", limit=" + limit +
                    '}';
        }
    }

### mapper ###

*  AdminMapper.java

package com.antrain.restful.mapper;
    
    import com.antrain.restful.entity.Admin;
    import org.apache.ibatis.annotations.Select;
    import org.springframework.stereotype.Component;
    
    @Component
    public interface AdminMapper { 
    
        @Select("SELECT * FROM admin WHERE name=#{name} AND pwd =#{pwd}")
        Admin login(String name, String pwd);
    }

*  UserMapper.java

package com.antrain.restful.mapper;
    
    import com.antrain.restful.entity.User;
    import org.apache.ibatis.annotations.Delete;
    import org.apache.ibatis.annotations.Insert;
    import org.apache.ibatis.annotations.Select;
    import org.apache.ibatis.annotations.Update;
    import org.springframework.stereotype.Component;
    
    import java.util.List;
    import java.util.Map;
    
    @Component
    public interface UserMapper  { 
    
        @Insert("insert into "+
                " user(id, username, password, sex, birth)"+
                "values (null, #{username,jdbcType=VARCHAR}, " +
                "#{password,jdbcType=VARCHAR}, #{sex,jdbcType=CHAR},#{birth, jdbcType=DATE} );")
        int insert(User user);
    
        @Delete("DELETE FROM user WHERE id=#{id};")
        int del(int id);
    
        @Update("UPDATE user SET username=#{username,jdbcType=VARCHAR}, password=#{password,jdbcType=VARCHAR} ,"+
                " sex= #{sex,jdbcType=CHAR},birth=#{birth,jdbcType=DATE} WHERE id=#{id,jdbcType=INTEGER};")
        int update(User user);
    
        @Select("SELECT * FROM user WHERE id=#{id};")
        User queryById(int id);
    
        @Select("SELECT * FROM user ;")
        List<User> queryAll();
    
        @Select(" <script>" +
                " SELECT * FROM user " +
                "<if test=\"offset!=null and limit!=null\">"+
                "limit #{offset},#{limit}"+
                "</if>"+
                " </script>")
        List<User> getBatch(Map params);
    
        @Select("select count(*) from user")
        int getTotal();
    }

*  实体层参考数据库表，service 方法跟mapper差不多

### service ###

*  UserServiceImpl.java

package com.antrain.restful.service.impl;
    
    import com.antrain.restful.entity.User;
    import com.antrain.restful.mapper.UserMapper;
    import com.antrain.restful.service.UserService;
    import com.antrain.restful.util.PageResult;
    import com.antrain.restful.util.PageUtil;
    import org.springframework.stereotype.Service;
    
    import javax.annotation.Resource;
    import java.util.List;
    
    @Service
    public class UserServiceImpl implements UserService { 
    
        @Resource
        private UserMapper userMapper;
    
        @Override
        public int insert(User user) { 
            return userMapper.insert(user);
        }
    
        @Override
        public int del(int id) { 
            return userMapper.del(id);
        }
    
        @Override
        public int update(User user) { 
            return userMapper.update(user);
        }
    
        @Override
        public User queryById(int id) { 
            return userMapper.queryById(id);
        }
    
        @Override
        public List<User> queryAll() { 
            return userMapper.queryAll();
        }
    
        @Override
        public PageResult queryUsers(PageUtil pageUtil) { 
            List<User> users = userMapper.getBatch(pageUtil);
            int total = userMapper.getTotal();
            PageResult pageResult = new PageResult(users, total, pageUtil.getLimit(), pageUtil.getPage());
            return pageResult;
        }
    }

### filter ###

*  AdminLoginInterceptor.java

AdminLoginInterceptor
    package com.antrain.restful.filter;
    
    import org.springframework.stereotype.Component;
    import org.springframework.web.servlet.HandlerInterceptor;
    import org.springframework.web.servlet.ModelAndView;
    
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    @Component
    public class AdminLoginInterceptor implements HandlerInterceptor { 
    
        /** * 在DispatcherServlet之前执行。 * */
        @Override
        public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object o) throws Exception { 
            String uri = request.getRequestURI();
            if (uri.startsWith("/admin") && null == request.getSession().getAttribute("loginUser")&&uri.endsWith("/admin/login")==false) { 
                request.getSession().setAttribute("errorMsg", "请重新登陆");
                response.sendRedirect(request.getContextPath() + "/admin/login");
                return false;
            } else { 
                request.getSession().removeAttribute("errorMsg");
                return true;
            }
        }
    
        /** * 在controller执行之后的DispatcherServlet之后执行。 * */
        @Override
        public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception { 
        }
    
        /** * 在页面渲染完成返回给客户端之前执行。一般用于资源清理操作 * */
        @Override
        public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception { 
    
        }
    }

### config ###

*  SiteWebMvcConfigurer.java

package com.antrain.restful.config;
    
    import com.antrain.restful.filter.AdminLoginInterceptor;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.web.servlet.config.annotation.*;
    
    @Configuration
    public class SiteWebMvcConfigurer implements WebMvcConfigurer { 
    
    
        private final AdminLoginInterceptor adminLoginInterceptor;
    
        @Autowired
        public SiteWebMvcConfigurer(AdminLoginInterceptor adminLoginInterceptor) { 
            this.adminLoginInterceptor = adminLoginInterceptor;
        }
    
        @Override
        public void addInterceptors(InterceptorRegistry registry) { 
            // 添加一个拦截器，拦截以/admin为前缀的url路径
            registry.addInterceptor(adminLoginInterceptor).addPathPatterns("/admin/**")
                    .excludePathPatterns("/admin/login");
        }
    
    
        @Override
        public void addResourceHandlers(ResourceHandlerRegistry registry) { 
            //使外部能访问静态资源
            registry.addResourceHandler("/static/**").addResourceLocations("classpath:/static/");
        }
    
    }

### controller ###

*  AdminController.java

package com.antrain.restful.controller;
    
    import com.antrain.restful.entity.Admin;
    import com.antrain.restful.service.AdminService;
    import org.springframework.stereotype.Controller;
    import org.springframework.util.StringUtils;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.PostMapping;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestParam;
    
    import javax.annotation.Resource;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpSession;
    import java.util.Map;
    
    @Controller
    @RequestMapping("/admin")
    public class AdminController { 
    
        @Resource
        private AdminService adminService;
    
        @GetMapping("/login")
        public String login(){ 
            return "admin/login";
        }
    
        @PostMapping("/login")
        public String login(@RequestParam("userName") String userName,
                            @RequestParam("password") String password,
                            Map<String,Object> map, HttpSession session){ 
            if (StringUtils.isEmpty(userName) || StringUtils.isEmpty(password)) { 
                map.put("errorMsg", "用户名或密码不能为空");
                return "admin/login";
            }
            Admin adminUser = adminService.login(userName, password);
            if (adminUser != null) { 
                session.setAttribute("loginUser", adminUser.getName());
                session.setAttribute("loginUserId", adminUser.getAid());
                //session过期时间设置为7200秒 即两小时
                session.setMaxInactiveInterval(60 * 60 * 2);
                return "redirect:/admin/index";
            } else { 
                map.put("errorMsg", "登陆失败");
                return "admin/login";
            }
        }
    
        @GetMapping({ "", "/", "/index", "/index.html"})
        public String index(HttpServletRequest request) { 
            request.setAttribute("path", "index");
            return "admin/index";
        }
    
    }

*  UserController.java

package com.antrain.restful.controller;
    
    import com.antrain.restful.entity.User;
    import com.antrain.restful.service.UserService;
    import org.springframework.stereotype.Controller;
    import org.springframework.ui.Model;
    import org.springframework.web.bind.annotation.*;
    
    import javax.annotation.Resource;
    
    @Controller
    @RequestMapping("/admin")
    public class UserController { 
    
        @Resource
        private UserService userService;
    
        @GetMapping("/users")
        public String list(Model model){ 
            model.addAttribute("users",userService.queryAll());
            return "admin/list";
        }
    
        @GetMapping("/user")
        public  String toAdd(Model model){ 
            return "admin/add";
        }
    
        @PostMapping("/user")
        public String add(User user){ 
            System.out.println(user);
            userService.insert(user);
            return "redirect:/admin/users";
        }
    
        @GetMapping("/user/{id}")
        public String toEdit(@PathVariable("id") Integer id, Model model){ 
            model.addAttribute("user",userService.queryById(id));
            return "admin/add";
        }
    
        @PutMapping("/user")
        public String update(@RequestBody User user){ 
            System.out.println(user);
            userService.update(user);
            System.out.println("修改");
            return "redirect:/admin/users";
        }
    
        @DeleteMapping("/user/{id}")
        public String del(@PathVariable("id") Integer id){ 
            userService.del(id);
            return "redirect:/admin/users";
        }
    }

### 问题日志 ###

*  Request method ‘POST’ not supported

1. 原因：使用restful的put delete 方法无效
    2. 解决：在配置加入：
    # 版本需要手动开启配置 restful put delete 有效
    spring.mvc.hiddenmethod.filter.enabled = true

*  Content type ‘application/x-www-form-urlencoded;charset=UTF-8’ not supported

// 问题代码
        @PutMapping("/user")
        public String update(@RequestBody User user){ 
            userService.update(user);
            return "redirect:/admin/users";
        }
     // 参考：https://blog.csdn.net/feiyst/article/details/88431621
     // 解决：去掉@RequestBody即可

[Link 1]: https://www.mockaroo.com/
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[Link 2]: https://blog.csdn.net/qq_41741884/article/details/103012745