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本文阅读大概 20 分钟, 自己写加思考大概 2 ~ 3 小时。建议:代码可以手抄, 但不要复制。
1. 整体框架
2. 新建表 bot
在数据库中新建表 bot
表中包含的列:
id: int
:非空、自动增加、唯一、主键
pojo
中定义主键的注解:@TableId(type = IdType.AUTO)
-
user_id: int
:非空
注意:在pojo
中需要定义成userId
,在queryWrapper
中的名称仍然为user_id
-
title: varchar(100)
-
description: varchar(300)
-
content:varchar(10000)
-
rating: int
:默认值为1500 -
createtime: datetime
pojo
中定义日期格式的注解:@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss")
-
modifytime: datetime
pojo
中定义日期格式的注解:@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss")
3.实现后端API
3.1 连接数据库和后端
- 在
pojo
目录下新建新的文件Bot.java
,数据和数据库中的bot
表一一对应。
package com.kob.backend.pojo;
import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableId;
import com.fasterxml.jackson.annotation.JsonFormat;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import java.util.Date;
@Data
@NoArgsConstructor
@AllArgsConstructor
public class Bot {
@TableId(type = IdType.AUTO)
private Integer id; //在pojo里最好用Integer,否则会报警告
private Integer userId; //pojo里要用驼峰命名法和数据库的下划线对应
private String title;
private String description;
private String content;
private Integer rating;
@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss")
private Date createtime;
@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss")
private Date modifytime;
}
- 在
Mapper
目录下新建BotMapper.java
文件,映射SQL
语句。
package com.kob.backend.mapper;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.kob.backend.pojo.Bot;
import org.apache.ibatis.annotations.Mapper;
@Mapper
public interface BotMapper extends BaseMapper<Bot> {
}
3.2 实现 增删改查 API
Ⅰ增加一个Bot
- 在
com/kob/backend/service/user
新建一个新目录bot
同时新建一个接口文件AddService
package com.kob.backend.service.user.bot;
import java.util.Map;
public interface AddService {
Map<String, String> add(Map<String, String> data);
}
- 在
com/kob/backend/service/impl/user
新建一个新目录bot
同时新建一个实现类AddServiceImpl
package com.kob.backend.service.impl.user.bot;
import com.kob.backend.mapper.BotMapper;
import com.kob.backend.pojo.Bot;
import com.kob.backend.pojo.User;
import com.kob.backend.service.impl.utils.UserDetailsImpl;
import com.kob.backend.service.user.bot.AddService;
import lombok.Data;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.userdetails.UserCache;
import org.springframework.stereotype.Service;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
@Service
public class AddServiceImpl implements AddService {
@Autowired
private BotMapper botMapper;
@Override
public Map<String, String> add(Map<String, String> data) {
UsernamePasswordAuthenticationToken authenticationToken = (UsernamePasswordAuthenticationToken) SecurityContextHolder.getContext().getAuthentication();
UserDetailsImpl loginUser = (UserDetailsImpl) authenticationToken.getPrincipal();
User user = loginUser.getUser();
String title = data.get("title");
String description = data.get(("description"));
String content = data.get("content");
Map<String, String> map = new HashMap<>();
if (title == null || title.length() == 0) {
map.put("error_message", "标题不能为空");
return map;
}
if (title.length() > 100) {
map.put("error_message", "标题长度不能大于100");
return map;
}
if (description == null || description.length() == 0) {
description = "这个用户很懒,什么也没有留下~";
}
if (description.length() > 300) {
map.put("error_message", "Bot描述的长度不能大于300");
return map;
}
if (content == null || content.length() == 0) {
map.put("error_message", "代码不能为空");
return map;
}
if (content.length() > 10000) {
map.put("error_message", "代码长度不能超过10000");
return map;
}
Date now = new Date();
Bot bot = new Bot(null, user.getId(), title, description, content, 1500, now, now);
botMapper.insert(bot);
map.put("error_message", "success");
return map;
}
}
- 在
com/kob/backend/controller/user
新建一个新目录bot
同时新建一个Controller
类AddController
。
package com.kob.backend.controller.user.bot;
import com.kob.backend.service.user.bot.AddService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import java.util.Map;
@RestController
public class AddController {
@Autowired
private AddService addService;
@PostMapping("/user/bot/add/")
public Map<String, String> add(@RequestParam Map<String, String> data) {
return addService.add(data);
}
}
增加一个 bot 测试
- 在前端 web 项目下
kob/web/src/views/user/bot
的文件UserBotIndexView.vue
下编写测试。
<template>
<ContentField>
我的Bot
</ContentField>
</template>
<script>
import ContentField from '../../../components/ContentField'
import $ from 'jquery'
import { useStore } from 'vuex';
export default {
components: {
ContentField
},
setup() {
const store = useStore();
// 在这里,设置的端口号为 8080,如果你已经修改了端口号,需要修改url。
$.ajax({
url: "http://127.0.0.1:8080/user/bot/add/",
type: "post",
data: {
title: "Bot的标题",
description : "Bot的描述",
content: "Bot的代码",
},
headers: {
Authorization: "Bearer " + store.state.user.token,
},
success(resp) {
console.log(resp);
},
error(resp) {
console.log(resp);
}
})
}
}
</script>
<style scoped>
</style>
效果如下:
Ⅱ 删除一个Bot
- 在
com/kob/backend/service/user/bot
新建一个接口文件RemoveService
package com.kob.backend.service.user.bot;
import java.util.Map;
public interface RemoveService {
Map<String, String> remove(Map<String, String> data);
}
- 在
com/kob/backend/service/impl/user/bot
新建一个实现类RemoveServiceImpl
package com.kob.backend.service.impl.user.bot;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.kob.backend.mapper.BotMapper;
import com.kob.backend.pojo.Bot;
import com.kob.backend.pojo.User;
import com.kob.backend.service.impl.utils.UserDetailsImpl;
import com.kob.backend.service.user.bot.RemoveService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.stereotype.Service;
import java.util.HashMap;
import java.util.Map;
@Service
public class RemoveServiceImpl implements RemoveService {
@Autowired
private BotMapper botMapper;
@Override
public Map<String, String> remove(Map<String, String> data) {
UsernamePasswordAuthenticationToken authenticationToken = (UsernamePasswordAuthenticationToken) SecurityContextHolder.getContext().getAuthentication();
UserDetailsImpl loginUser = (UserDetailsImpl) authenticationToken.getPrincipal();
User user = new User();
int bot_id = Integer.parseInt(data.get("bot_id"));
Bot bot = botMapper.selectById(bot_id);
Map<String, String> map = new HashMap<>();
if (bot == null) {
map.put("error_message", "Bot不存在或已被删除");
return map;
}
if (!bot.getUserId().equals(user.getId())) {
map.put("error_message", "没有权限删除该Bot");
return map;
}
botMapper.deleteById(bot_id);
map.put("error_message", "success");
return map;
}
}
- 在
com/kob/backend/controller/user/bot
新建一个Controller
类RemoveController
。
package com.kob.backend.controller.user.bot;
import com.kob.backend.service.user.bot.RemoveService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import java.util.Map;
@RestController
public class RemoveController {
@Autowired
private RemoveService removeService;
@PostMapping("/user/bot/remove/")
public Map<String, String> remove(@RequestParam Map<String, String> data) {
return removeService.remove(data);
}
}
删除一个 Bot 测试
- 在前端 web 项目下
kob/web/src/views/user/bot
的文件UserBotIndexView.vue
下编写测试。
<template>
<ContentField>
我的Bot
</ContentField>
</template>
<script>
import ContentField from '../../../components/ContentField'
import $ from 'jquery'
import { useStore } from 'vuex';
export default {
components: {
ContentField
},
setup() {
const store = useStore();
// 在这里,设置的端口号为 8080,如果你已经修改了端口号,需要修改url。
$.ajax({
url: "http://127.0.0.1:8080/user/bot/remove/",
type: "POST",
data: {
bot_id: 3, //可以修改为自己的bot_id
},
headers: {
Authorization: "Bearer " + store.state.user.token,
},
success(resp) {
console.log(resp);
},
error(resp) {
console.log(resp);
}
})
}
}
</script>
<style scoped>
</style>
效果如下:
Ⅲ 修改一个 Bot
- 在
com/kob/backend/service/user/bot
新建一个接口文件UpdateService
package com.kob.backend.service.user.bot;
import java.util.Map;
public interface UpdateService {
Map<String, String> update(Map<String, String> data);
}
- 在
com/kob/backend/service/impl/user/bot
新建一个实现类UpdateServiceImpl
package com.kob.backend.service.impl.user.bot;
import com.kob.backend.mapper.BotMapper;
import com.kob.backend.pojo.Bot;
import com.kob.backend.pojo.User;
import com.kob.backend.service.impl.utils.UserDetailsImpl;
import com.kob.backend.service.user.bot.UpdateService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.stereotype.Service;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
@Service
public class UpdateServiceImpl implements UpdateService {
@Autowired
private BotMapper botMapper;
@Override
public Map<String, String> update(Map<String, String> data) {
UsernamePasswordAuthenticationToken authenticationToken = (UsernamePasswordAuthenticationToken) SecurityContextHolder.getContext().getAuthentication();
UserDetailsImpl loginUser = (UserDetailsImpl) authenticationToken.getPrincipal();
User user = loginUser.getUser();
int bot_id = Integer.parseInt(data.get("bot_id"));
String title = data.get("title");
String description = data.get("description");
String content = data.get("content");
Map<String, String> map = new HashMap<>();
if (title == null || title.length() == 0) {
map.put("error_message", "标题不能为空");
return map;
}
if (title.length() > 100) {
map.put("error_message", "标题长度不能大于100");
return map;
}
if (description == null || description.length() == 0) {
description = "这个用户很懒,什么也没有留下~";
}
if (description.length() > 300) {
map.put("error_message", "Bot描述的长度不能大于300");
return map;
}
if (content == null || content.length() == 0) {
map.put("error_message", "代码不能为空");
return map;
}
if (content.length() > 10000) {
map.put("error_message", "代码长度不能超过10000");
}
Bot bot = botMapper.selectById(bot_id);
if (bot == null) {
map.put("error_message", "Bot不存在或已经被删除");
return map;
}
if (!bot.getUserId().equals(user.getId())) {
map.put("error_message", "没有权限修改该Bot");
return map;
}
Bot new_bot = new Bot(
bot.getId(),
user.getId(),
title,
description,
content,
bot.getRating(),
bot.getCreatetime(),
new Date()
);
botMapper.updateById(new_bot);
map.put("error_message", "success");
return map;
}
}
- 在
com/kob/backend/controller/user/bot
新建一个Controller
类UpdateController
。
package com.kob.backend.controller.user.bot;
import com.kob.backend.service.user.bot.UpdateService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import java.util.Map;
@RestController
public class UpdateController {
@Autowired
private UpdateService updateService;
@PostMapping("/user/bot/update/")
public Map<String, String> update(@RequestParam Map<String, String> data) {
return updateService.update(data);
}
}
修改一个 Bot 测试
- 在前端 web 项目下
kob/web/src/views/user/bot
的文件UserBotIndexView.vue
下编写测试。
<template>
<ContentField>
我的Bot
</ContentField>
</template>
<script>
import ContentField from '../../../components/ContentField'
import $ from 'jquery'
import { useStore } from 'vuex';
export default {
components: {
ContentField
},
setup() {
const store = useStore();
// 在这里,设置的端口号为 8080,如果你已经修改了端口号,需要修改url。
$.ajax({
url: "http://127.0.0.1:8080/user/bot/update/",
type: "POST",
data: {
bot_id: 1,
title: "我是Bot_1的标题",
description : "我是Bot_1的描述",
content: "我是Bot_1的代码",
},
headers: {
Authorization: "Bearer " + store.state.user.token,
},
success(resp) {
console.log(resp);
},
error(resp) {
console.log(resp);
}
})
}
}
</script>
<style scoped>
</style>
效果如下:
Ⅳ 查询 Bot 列表
- 在
com/kob/backend/service/user/bot
新建一个接口文件GetListService
package com.kob.backend.service.user.bot;
import com.kob.backend.pojo.Bot;
import java.util.List;
public interface GetListService {
List<Bot> getList();
}
- 在
com/kob/backend/service/impl/user/bot
新建一个实现类GetListServiceImpl
package com.kob.backend.service.impl.user.bot;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.kob.backend.mapper.BotMapper;
import com.kob.backend.pojo.Bot;
import com.kob.backend.pojo.User;
import com.kob.backend.service.impl.utils.UserDetailsImpl;
import com.kob.backend.service.user.bot.GetListService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.stereotype.Service;
import java.util.List;
@Service
public class GetListServiceImpl implements GetListService {
@Autowired
private BotMapper botMapper;
@Override
public List<Bot> getList() {
UsernamePasswordAuthenticationToken authenticationToken = (UsernamePasswordAuthenticationToken) SecurityContextHolder.getContext().getAuthentication();
UserDetailsImpl loginUser = (UserDetailsImpl) authenticationToken.getPrincipal();
User user = loginUser.getUser();
QueryWrapper<Bot> queryWrapper = new QueryWrapper<>();
queryWrapper.eq("user_id", user.getId());
return botMapper.selectList(queryWrapper);
}
}
- 在
com/kob/backend/controller/user/bot
新建一个Controller
类GetListController
。
package com.kob.backend.controller.user.bot;
import com.kob.backend.pojo.Bot;
import com.kob.backend.service.user.bot.GetListService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.List;
@RestController
public class GetListController {
@Autowired
private GetListService getListService;
@GetMapping("/user/bot/getlist/")
public List<Bot> getList() {
return getListService.getList();
}
}
查询 Bot 列表测试
- 在前端 web 项目下
kob/web/src/views/user/bot
的文件UserBotIndexView.vue
下编写测试。
<template>
<ContentField>
我的Bot
</ContentField>
</template>
<script>
import ContentField from '../../../components/ContentField'
import $ from 'jquery'
import { useStore } from 'vuex';
export default {
components: {
ContentField
},
setup() {
const store = useStore();
// 在这里,设置的端口号为 8080,如果你已经修改了端口号,需要修改url。
$.ajax({
url: "http://127.0.0.1:8080/user/bot/getlist/",
type: "get",
headers: {
Authorization: "Bearer " + store.state.user.token,
},
success(resp) {
console.log(resp);
},
error(resp) {
console.log(resp);
}
})
}
}
</script>
<style scoped>
</style>
效果如下:
先赞后看
大佬不知道你还能不能看到,但是我真的太感谢你了。你关于pojo层命名需要驼峰命名法对应那里真的帮了我一大忙,我就是命名不对应,导致我的bot对象在访问user_id时一直返回null,我debug了好久,要不是看了你说的我可能要一直错下去。
写得太好了,看着很舒服
无敌
%%%
%%%
棒!!!
感谢