SpringBoot开源项目学习总结

Posted 2021-02-13 ustc-anmin

一、实现日期格式数据类型的转换

首先，定义DateConverter实现Converter<String, Date>接口：

 1 package com.stevlu.common;
 2 
 3 import org.springframework.core.convert.converter.Converter;
 4 
 5 import java.text.ParseException;
 6 import java.text.SimpleDateFormat;
 7 import java.util.Date;
 8 
 9 /**
10  * Created by Steven Lu on 2018/11/21.
11  */
12 public class DateConverter implements Converter<String, Date> {
13     private SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");
14 
15     @Override
16     public Date convert(String s) {
17         if ("".equals(s) || s == null) {
18             return null;
19         }
20         try {
21             return simpleDateFormat.parse(s);
22         } catch (ParseException e) {
23             e.printStackTrace();
24         }
25         return null;
26     }
27 }

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 然后，在一个JAVA配置类中将该转换器注册进去：

 1 package com.stevlu.config;
 2 
 3 import org.springframework.context.annotation.Bean;
 4 import org.springframework.context.annotation.Configuration;
 5 import org.springframework.format.FormatterRegistry;
 6 import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
 7 
 8 import com.stevlu.common.DateConverter;
 9 
10 import java.util.concurrent.ExecutorService;
11 import java.util.concurrent.Executors;
12 
13 /**
14  * Created by Steven Lu on 2018/11/21.
15  */
16 @Configuration
17 public class WebMvcConfig extends WebMvcConfigurerAdapter {
18     @Override
19     public void addFormatters(FormatterRegistry registry) {
20         registry.addConverter(new DateConverter());
21     }
22 
23     @Bean
24     public ExecutorService executorService() {
25         return Executors.newCachedThreadPool();
26     }
27 }

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 这样就在SpringBoot项目中实现了字符串类型数据转换成日期类型数据的功能。

---

 二、项目开发思路思考

1、首先，可以在项目中定义需要使用到的pojo对象，以此来实现与数据库的对象关系映射，需要注意的对象中的属性最好能与数据库中的字段名称保持一致，如下图所示：

  1 package com.stevlu.bean;
  2 
  3 import com.fasterxml.jackson.annotation.JsonIgnore;
  4 import org.springframework.security.core.GrantedAuthority;
  5 import org.springframework.security.core.authority.SimpleGrantedAuthority;
  6 import org.springframework.security.core.userdetails.UserDetails;
  7 
  8 import java.util.ArrayList;
  9 import java.util.Collection;
 10 import java.util.List;
 11 
 12 /**
 13  * Created by Steven Lu on 2018/10/30.
 14  */
 15 public class Hr implements UserDetails {
 16     private Long id;
 17     private String name;
 18     private String phone;
 19     private String email;
 20     private String address;
 21     private boolean enabled;
 22     private String username;
 23     private String password;
 24     private Long dept;
 25     private List<Role> roles;
 26     private String userface;
 27 
 28     public String getUserface() {
 29         return userface;
 30     }
 31 
 32     public void setUserface(String userface) {
 33         this.userface = userface;
 34     }
 35 
 36     public List<Role> getRoles() {
 37         return roles;
 38     }
 39 
 40     public void setRoles(List<Role> roles) {
 41         this.roles = roles;
 42     }
 43 
 44     public Long getId() {
 45         return id;
 46     }
 47 
 48     public void setId(Long id) {
 49         this.id = id;
 50     }
 51 
 52     public String getName() {
 53         return name;
 54     }
 55 
 56     public void setName(String name) {
 57         this.name = name;
 58     }
 59 
 60     public String getPhone() {
 61         return phone;
 62     }
 63 
 64     public void setPhone(String phone) {
 65         this.phone = phone;
 66     }
 67 
 68     public String getEmail() {
 69         return email;
 70     }
 71 
 72     public void setEmail(String email) {
 73         this.email = email;
 74     }
 75 
 76     public String getAddress() {
 77         return address;
 78     }
 79 
 80     public void setAddress(String address) {
 81         this.address = address;
 82     }
 83 
 84     @Override
 85     public boolean isEnabled() {
 86         return enabled;
 87     }
 88 
 89     public void setEnabled(boolean enabled) {
 90         this.enabled = enabled;
 91     }
 92 
 93     @Override
 94     public String getUsername() {
 95         return username;
 96     }
 97 
 98     @JsonIgnore
 99     @Override
100     public boolean isAccountNonExpired() {
101         return true;
102     }
103 
104     @JsonIgnore
105     @Override
106     public boolean isAccountNonLocked() {
107         return true;
108     }
109 
110     @JsonIgnore
111     @Override
112     public boolean isCredentialsNonExpired() {
113         return true;
114     }
115 
116     public void setUsername(String username) {
117         this.username = username;
118     }
119 
120     @JsonIgnore
121     @Override
122     public Collection<? extends GrantedAuthority> getAuthorities() {
123         List<GrantedAuthority> authorities = new ArrayList<>();
124         for (Role role : roles) {
125             authorities.add(new SimpleGrantedAuthority(role.getName()));
126         }
127         return authorities;
128     }
129 
130     @Override
131     public String getPassword() {
132         return password;
133     }
134 
135     public void setPassword(String password) {
136         this.password = password;
137     }
138 
139     public Long getDept() {
140         return dept;
141     }
142 
143     public void setDept(Long dept) {
144         this.dept = dept;
145     }
146 }

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Hr.java

数据库中相应字段

2、然后思考项目中可能用到的数据库相关操作，增删改查，一对多，多对多的联系等。清楚完需要用的操作后，就可以开始编写Mybatis中mapper接口和mapper.xml文件了，详细的mapper.xml文件定义方法见之前的博客。（使用mapper接口的方法，mybatis配置文件会自动帮我们生成接口的实现类）

  1 <?xml version="1.0" encoding="UTF-8" ?>
  2 <!DOCTYPE mapper
  3         PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
  4         "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
  5 <mapper namespace="com.stevlu.mapper.HrMapper">
  6     <resultMap id="BaseResultMap" type="com.stevlu.bean.Hr">
  7         <id column="id" property="id"/>
  8         <result column="name" property="name"/>
  9         <result column="phone" property="phone"/>
 10         <result column="email" property="email"/>
 11         <result column="address" property="address"/>
 12         <result column="enabled" property="enabled"/>
 13         <result column="username" property="username"/>
 14         <result column="password" property="password"/>
 15         <result column="userface" property="userface"/>
 16         <result column="dept" property="dept"/>
 17     </resultMap>
 18     <resultMap id="lazyLoadRoles" type="com.stevlu.bean.Hr" extends="BaseResultMap">
 19         <collection property="roles" ofType="com.stevlu.bean.Role" select="com.stevlu.mapper.HrMapper.getRolesByHrId"
 20                     column="id"></collection>
 21     </resultMap>
 22     <resultMap id="eagerLoadRoles" type="com.stevlu.bean.Hr" extends="BaseResultMap">
 23         <collection property="roles" ofType="com.stevlu.bean.Role">
 24             <id property="id" column="rid"/>
 25             <result property="name" column="rname"/>
 26             <result property="nameZh" column="rnameZh"/>
 27         </collection>
 28     </resultMap>
 29     <select id="loadUserByUsername" resultMap="lazyLoadRoles">
 30         select * from tkt_hr WHERE username=#{username}
 31     </select>
 32     <select id="getRolesByHrId" resultType="com.stevlu.bean.Role">
 33         SELECT r.* FROM tkt_hr_role h, tkt_role r where h.rid=r.id AND h.hrid=#{id}
 34     </select>
 35     <insert id="hrReg">
 36         INSERT INTO tkt_hr set username=#{username},password=#{password}
 37     </insert>
 38     <update id="hrUpdatep" parameterType="com.stevlu.bean.Hr">
 39         update tkt_hr
 40         <set>
 41             <if test="password != null">
 42                 password = #{password,jdbcType=VARCHAR},
 43             </if>
 44         </set>
 45         where username = #{username}
 46     </update>
 47     <select id="getHrsByKeywords" resultMap="eagerLoadRoles">
 48         select h.*, r.id as rid, r.name as rname, r.nameZh as rnameZh from tkt_hr h
 49             left join tkt_hr_role h_r on h.id = h_r.hrid
 50             left join tkt_role r on h_r.rid = r.id
 51         where h.id not in 
 52             (select h_r.hrid from tkt_hr_role h_r, tkt_role r where h_r.rid = r.id and r.nameZh = ‘系统管理员‘)
 53         <if test="keywords!=‘all‘ and keywords!=‘‘">
 54             and h.username like ‘%‘ || #{keywords} ||‘%‘
 55         </if>
 56         order by h.id
 57     </select>
 58     <select id="getHrById" resultMap="eagerLoadRoles">
 59         select h.*,r.id AS rid,r.name AS rname,r.nameZh AS rnameZh from ((tkt_hr h left join tkt_hr_role
 60         h_r on ((h.id = h_r.hrid))) left join tkt_role r on ((h_r.rid = r.id))) where h.id=#{hrId}
 61     </select>
 62     <update id="updateHr" parameterType="com.stevlu.bean.Hr">
 63         update tkt_hr
 64         <set>
 65             <if test="name != null">
 66                 name = #{name,jdbcType=VARCHAR},
 67             </if>
 68             <if test="phone != null">
 69                 phone = #{phone,jdbcType=CHAR},
 70             </if>
 71             <if test="email != null">
 72                 email = #{email,jdbcType=VARCHAR},
 73             </if>
 74             <if test="address != null">
 75                 address = #{address,jdbcType=VARCHAR},
 76             </if>
 77             <if test="enabled != null">
 78                 enabled = #{enabled,jdbcType=BIT},
 79             </if>
 80             <if test="username != null">
 81                 username = #{username,jdbcType=VARCHAR},
 82             </if>
 83             <if test="password != null">
 84                 password = #{password,jdbcType=VARCHAR},
 85             </if>
 86             <if test="userface != null">
 87                 userface = #{userface,jdbcType=VARCHAR},
 88             </if>
 89             <if test="dept != null">
 90                 dept = #{dept,jdbcType=INTEGER},
 91             </if>
 92         </set>
 93         where id = #{id}
 94     </update>
 95     <update id="updateHrDept" parameterType="com.stevlu.bean.Hr">
 96         update tkt_hr
 97         <set>
 98             <if test="dept != null">
 99                 dept = #{dept,jdbcType=INTEGER},
100             </if>
101         </set>
102         where id = #{id}
103     </update>
104     <update id="updateHrPhone" parameterType="com.stevlu.bean.Hr">
105         update tkt_hr
106         <set>
107             <if test="phone != null">
108                 phone = #{phone,jdbcType=INTEGER},
109             </if>
110         </set>
111         where id = #{id}
112     </update>
113     <update id="updateHrEmail" parameterType="com.stevlu.bean.Hr">
114         update tkt_hr
115         <set>
116             <if test="email != null">
117                 email = #{email,jdbcType=VARCHAR},
118             </if>
119         </set>
120         where id = #{id}
121     </update>
122     <update id="updateHrUsername" parameterType="com.stevlu.bean.Hr">
123         update tkt_hr
124         <set>
125             <if test="username != null">
126                 username = #{username,jdbcType=VARCHAR},
127             </if>
128         </set>
129         where id = #{id}
130     </update>
131     <update id="updateHrName" parameterType="com.stevlu.bean.Hr">
132         update tkt_hr
133         <set>
134             <if test="name != null">
135                 name = #{name,jdbcType=VARCHAR},
136             </if>
137         </set>
138         where id = #{id}
139     </update>
140     <delete id="deleteRoleByHrId" parameterType="Long">
141         DELETE FROM tkt_hr_role where hrid=#{hrId}
142     </delete>
143     <insert id="addRolesForHr">
144         INSERT INTO tkt_hr_role(id,hrid,rid) select SEQ_TKT_HR_ROLE_NEWID.NEXTVAL, tmp.* from (
145         <foreach collection="rids" separator="union all" item="rid">
146             select #{hrId}, #{rid} from dual
147         </foreach>
148         ) tmp
149     </insert>
150     <delete id="deleteHr" parameterType="Long">
151         DELETE FROM tkt_hr WHERE id=#{hrId}
152     </delete>
153     <select id="getAllHr" resultType="com.stevlu.bean.Hr">
154         select * from tkt_hr
155         <if test="currentId!=null">
156             WHERE id !=#{currentId}
157         </if>
158     </select>
159 </mapper>

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 1 package com.stevlu.mapper;
 2 
 3 import org.apache.ibatis.annotations.Param;
 4 
 5 import com.stevlu.bean.Hr;
 6 import com.stevlu.bean.Role;
 7 
 8 import java.util.List;
 9 
10 /**
11  * Created by Steven Lu on 2018/10/30.
12  */
13 public interface HrMapper {
14     Hr loadUserByUsername(String username);
15 
16     List<Role> getRolesByHrId(Long id);
17 
18     int hrReg(@Param("username") String username, @Param("password") String password);
19 
20     int hrUpdatep(@Param("username") String username, @Param("password") String password);
21     
22     List<Hr> getHrsByKeywords(@Param("keywords") String keywords);
23 
24     int updateHr(Hr hr);
25 
26     int updateHrDept(Hr hr);
27     
28     int updateHrPhone(Hr hr);
29     
30     int updateHrEmail(Hr hr);
31     
32     int updateHrUsername(Hr hr);
33     
34     int updateHrName(Hr hr);
35 
36     int deleteRoleByHrId(Long hrId);
37 
38     int addRolesForHr(@Param("hrId") Long hrId, @Param("rids") Long[] rids);
39 
40     Hr getHrById(Long hrId);
41 
42     int deleteHr(Long hrId);
43 
44     List<Hr> getAllHr(@Param("currentId") Long currentId);
45 }

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 要想让配置的mapper文件和mapper接口生效，需要在配置类中加上包扫描的注解，当然在全局配置文件中也可以设置。

package com.stevlu;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
@MapperScan("com.stevlu.mapper")
public class WebSocketServerApplication {

    public static void main(String[] args) {
        SpringApplication.run(WebSocketServerApplication.class, args);
    }
}

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---

3、操作数据库的mapper接口定义完成之后，我们就可以在service层调用定义好的mapper接口。（service层可以对传经来的参数进行一些处理）

  1 package com.stevlu.service;
  2 
  3 import org.springframework.beans.factory.annotation.Autowired;
  4 import org.springframework.security.core.userdetails.UserDetails;
  5 import org.springframework.security.core.userdetails.UserDetailsService;
  6 import org.springframework.security.core.userdetails.UsernameNotFoundException;
  7 import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
  8 import org.springframework.stereotype.Service;
  9 import org.springframework.transaction.annotation.Transactional;
 10 
 11 import com.stevlu.bean.Hr;
 12 import com.stevlu.common.HrUtils;
 13 import com.stevlu.mapper.HrMapper;
 14 
 15 import java.util.List;
 16 
 17 /**
 18  * Created by Steven Lu on 2018/10/30.
 19  */
 20 @Service
 21 @Transactional
 22 public class HrService implements UserDetailsService {
 23 
 24     @Autowired
 25     HrMapper hrMapper;
 26 
 27     @Override
 28     public UserDetails loadUserByUsername(String s) throws UsernameNotFoundException {
 29         Hr hr = hrMapper.loadUserByUsername(s);
 30         if (hr == null) {
 31             throw new UsernameNotFoundException("用户名不对");
 32         }
 33         return hr;
 34     }
 35 
 36     public int hrReg(String username, String password) {
 37         // 如果用户名存在，返回错误
 38         if (hrMapper.loadUserByUsername(username) != null) {
 39             return -1;
 40         }
 41         BCryptPasswordEncoder encoder = new BCryptPasswordEncoder();
 42         String encode = encoder.encode(password);
 43         return hrMapper.hrReg(username, encode);
 44     }
 45     
 46     public int hrUpdatep(String username, String oldPassword, String newPassword, String encodedPassword) {
 47         // 如果旧密码错误，返回错误
 48         BCryptPasswordEncoder encoder = new BCryptPasswordEncoder();
 49         if (encoder.matches(oldPassword, encodedPassword)) {
 50             String encode = encoder.encode(newPassword);
 51             return hrMapper.hrUpdatep(username, encode);
 52         } else {
 53             return -1;
 54         }
 55     }
 56 
 57     public List<Hr> getHrsByKeywords(String keywords) {
 58         return hrMapper.getHrsByKeywords(keywords);
 59     }
 60 
 61     public int updateHr(Hr hr) {
 62         return hrMapper.updateHr(hr);
 63     }
 64 
 65     public int updateHrDept(Hr hr) {
 66         return hrMapper.updateHrDept(hr);
 67     }
 68     
 69     public int updateHrPhone(Hr hr) {
 70         return hrMapper.updateHrPhone(hr);
 71     }
 72     
 73     public int updateHrEmail(Hr hr) {
 74         return hrMapper.updateHrEmail(hr);
 75     }
 76     
 77     public int updateHrUsername(Hr hr) {
 78         return hrMapper.updateHrUsername(hr);
 79     }
 80     
 81     public int updateHrName(Hr hr) {
 82         return hrMapper.updateHrName(hr);
 83     }
 84 
 85     public int updateHrRoles(Long hrId, Long[] rids) {
 86         int i = hrMapper.deleteRoleByHrId(hrId);
 87         return hrMapper.addRolesForHr(hrId, rids);
 88     }
 89 
 90     public Hr getHrById(Long hrId) {
 91         return hrMapper.getHrById(hrId);
 92     }
 93 
 94     public int deleteHr(Long hrId) {
 95         return hrMapper.deleteHr(hrId);
 96     }
 97 
 98     public List<Hr> getAllHrExceptAdmin() {
 99         return hrMapper.getAllHr(HrUtils.getCurrentHr().getId());
100     }
101 
102     public List<Hr> getAllHr() {
103         return hrMapper.getAllHr(null);
104     }
105 }

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---

 4、编写controller层，用于实现url请求的映射，由于项目是RESTful风格的，所以要注意url路径设计的技巧，以及HTTP请求的类型是什么，一般为（get查询，post增加，delete删除，put更新）

示例代码;

  1 package com.stevlu.controller;
  2 
  3 import org.springframework.beans.factory.annotation.Autowired;
  4 import org.springframework.web.bind.annotation.PathVariable;
  5 import org.springframework.web.bind.annotation.RequestMapping;
  6 import org.springframework.web.bind.annotation.RequestMethod;
  7 import org.springframework.web.bind.annotation.RestController;
  8 
  9 import com.stevlu.bean.*;
 10 import com.stevlu.service.*;
 11 
 12 import java.util.HashMap;
 13 import java.util.List;
 14 import java.util.Map;
 15 
 16 /**
 17  * Created by Steven Lu on 2018/11/21.
 18  */
 19 @RestController
 20 @RequestMapping("/system/basic")
 21 public class SystemBasicController {
 22     @Autowired
 23     RoleService roleService;
 24     @Autowired
 25     MenuService menuService;
 26     @Autowired
 27     MenuRoleService menuRoleService;
 28     @Autowired
 29     DepartmentService departmentService;
 30     @Autowired
 31     PositionService positionService;
 32     @Autowired
 33     JobLevelService jobLevelService;
 34     @Autowired
 35     TicketService ticketService;
 36 
 37     @RequestMapping(value = "/role/{rid}", method = RequestMethod.DELETE)
 38     public RespBean deleteRole(@PathVariable Long rid) {
 39         if (roleService.deleteRoleById(rid) == 1) {
 40             return new RespBean("success", "删除成功!");
 41         }
 42         return new RespBean("error", "删除失败!");
 43     }
 44 
 45     @RequestMapping(value = "/addRole", method = RequestMethod.POST)
 46     public RespBean addNewRole(String role, String roleZh) {
 47         if (roleService.addNewRole(role, roleZh) == 1) {
 48             return new RespBean("success", "添加成功!");
 49         }
 50         return new RespBean("error", "添加失败!");
 51     }
 52 
 53     @RequestMapping(value = "/menuTree/{rid}", method = RequestMethod.GET)
 54     public Map<String, Object> menuTree(@PathVariable Long rid) {
 55         Map<String, Object> map = new HashMap<>();
 56         List<Menu> menus = menuService.menuTree();
 57         map.put("menus", menus);
 58         List<Long> selMids = menuService.getMenusByRid(rid);
 59         map.put("mids", selMids);
 60         return map;
 61     }
 62 
 63     @RequestMapping(value = "/updateMenuRole", method = RequestMethod.PUT)
 64     public RespBean updateMenuRole(Long rid, Long[] mids) {
 65         if (menuRoleService.updateMenuRole(rid, mids) == mids.length) {
 66             return new RespBean("success", "更新成功!");
 67         }
 68         return new RespBean("error", "更新失败!");
 69     }
 70 
 71     @RequestMapping("/roles")
 72     public List<Role> allRoles() {
 73         return roleService.roles();
 74     }
 75 
 76     @RequestMapping(value = "/dep", method = RequestMethod.POST)
 77     public Map<String, Object> addDep(Department department) {
 78         Map<String, Object> map = new HashMap<>();
 79         int result = departmentService.addDep(department);
 80         if (result >= 1) {
 81             map.put("status", "success");
 82             map.put("msg", department);
 83             return map;
 84         }
 85         map.put("status", "error");
 86         map.put("msg", "添加失败!");
 87         return map;
 88     }
 89 
 90     @RequestMapping(value = "/dep/{did}", method = RequestMethod.DELETE)
 91     public RespBean deleteDep(@PathVariable Long did) {
 92         int result = departmentService.deleteDep(did);
 93         if (result > 0) {
 94             return new RespBean("success", "删除成功!");
 95         } else if (result == -1) {
 96             return new RespBean("error", "部门正被员工使用，取消关联前无法删除！");
 97         }
 98         return new RespBean("error", "删除失败!");
 99     }
100 
101     @RequestMapping(value = "/dep/{pid}", method = RequestMethod.GET)
102     public List<Department> getDepByPid(@PathVariable Long pid) {
103         return departmentService.getDepByPid(pid);
104     }
105 
106     @RequestMapping(value = "/deps", method = RequestMethod.GET)
107     public List<Department> getAllDeps() {
108         return departmentService.getAllDeps();
109     }
110 
111     @RequestMapping(value = "/position", method = RequestMethod.POST)
112     public RespBean addPos(Position pos) {
113         int result = positionService.addPos(pos);
114         if (result == 1) {
115             return new RespBean("success", "添加成功!");
116         } else if (result == -1) {
117             return new RespBean("error", "职位名重复，添加失败!");
118         }
119         return new RespBean("error", "添加失败!");
120     }
121 
122     @RequestMapping(value = "/positions", method = RequestMethod.GET)
123     public List<Position> getAllPos() {
124         return positionService.getAllPos();
125     }
126 
127     @RequestMapping("/position/{pids}")
128     public RespBean deletePosById(@PathVariable String pids) {
129         if (positionService.deletePosById(pids)) {
130             return new RespBean("success", "删除成功!");
131         }
132         return new RespBean("error", "删除失败!");
133     }
134 
135     @RequestMapping(value = "/position", method = RequestMethod.PUT)
136     public RespBean updatePosById(Position position) {
137         if (positionService.updatePosById(position) == 1) {
138             return new RespBean("success", "修改成功!");
139         }
140         return new RespBean("error", "修改失败!");
141     }
142 
143     @RequestMapping(value = "/joblevel", method = RequestMethod.POST)
144     public RespBean addJobLevel(JobLevel jobLevel) {
145         int result = jobLevelService.addJobLevel(jobLevel);
146         if (result == 1) {
147             return new RespBean("success", "添加成功!");
148         } else if (result == -1) {
149             return new RespBean("error", "职称名重复，添加失败!");
150         }
151         return new RespBean("error", "添加失败!");
152     }
153 
154     @RequestMapping(value = "/joblevels", method = RequestMethod.GET)
155     public List<JobLevel> getAllJobLevels() {
156         return jobLevelService.getAllJobLevels();
157     }
158 
159     @RequestMapping(value = "/joblevel/{ids}", method = RequestMethod.DELETE)
160     public RespBean deleteJobLevelById(@PathVariable String ids) {
161         if (jobLevelService.deleteJobLevelById(ids)) {
162             return new RespBean("success", "删除成功!");
163         }
164         return new RespBean("error", "删除失败!");
165     }
166 
167     @RequestMapping(value = "/joblevel", method = RequestMethod.PUT)
168     public RespBean updateJobLevel(JobLevel jobLevel) {
169         if (jobLevelService.updateJobLevel(jobLevel) == 1) {
170             return new RespBean("success", "修改成功!");
171         }
172         return new RespBean("error", "修改失败!");
173     }
174 }

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 最后不要忘记在application.properties文件中配置数据库的连接属性，mybatis配置文件所在的路径等相关配置。

# EMBEDDED SERVER CONFIGURATION (ServerProperties)
server.port=8082
server.session-timeout=1800
server.context-path=
server.tomcat.max-threads=0
server.tomcat.uri-encoding=UTF-8
server.tomcat.basedir=target/tomcat

# HTTP encoding (HttpEncodingProperties)
spring.http.encoding.charset=UTF-8
spring.http.encoding.enabled=true 
spring.http.encoding.force=true

#datasource
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/travel?serverTimezone=UTC&characterEncoding=utf-8
spring.datasource.username=root
spring.datasource.password=root
#spring.datasource.url=jdbc:oracle:thin:@//192.168.103.235:1521/taf
#spring.datasource.username=elite_ynj
#spring.datasource.password=EYuc1809#
mybatis.config-location=classpath:/mybatis-config.xml

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 该工程一个完整的目录结构如下：