后台搭建——SpringBoot+Vue学习（六）

Vue实现增删改查

1、安装axios，在vue文件的终端中输入：

npm i axios -S

2、request.js封装

import axios from 'axios'

const request = axios.create({
    baseURL: '/api',
    timeout: 5000
})

// request 拦截器
// 可以自请求发送前对请求做一些处理
// 比如统一加token，对请求参数统一加密
request.interceptors.request.use(config => {
    config.headers['Content-Type'] = 'application/json;charset=utf-8';

    // config.headers['token'] = user.token;  // 设置请求头
    return config
}, error => {
    return Promise.reject(error)
});

// response 拦截器
// 可以在接口响应后统一处理结果
request.interceptors.response.use(
    response => {
        let res = response.data;
        // 如果是返回的文件
        if (response.config.responseType === 'blob') {
            return res
        }
        // 兼容服务端返回的字符串数据
        if (typeof res === 'string') {
            res = res ? JSON.parse(res) : res
        }
        return res;
    },
    error => {
        console.log('err' + error) // for debug
        return Promise.reject(error)
    }
)


export default request

3、对fetch进行更改：

 load() {
      request.get("/user/page", {
        params: {
          pageNum: this.pageNum,
          pageSize: this.pageSize,
          username: this.username,
          email: this.email,
          address: this.address,
        }
      }).then(res => {
        console.log(res)

        this.tableData = res.records
        this.total = res.total

      })
    },

4、批量删除功能：

   delBatch() {
      let ids = this.multipleSelection.map(v => v.id)  // [{}, {}, {}] => [1,2,3]
      request.post("/user/del/batch", ids).then(res => {
        if (res) {
          this.$message.success("批量删除成功")
          this.load()
        } else {
          this.$message.error("批量删除失败")
        }
      })
    },

5、重置功能，就是把数据置空：

 reset() {
      this.username = ""
      this.email = ""
      this.address = ""
      this.load()
    },

6、main.js中加入request：

Vue.prototype.request=request

7、对UserController进行更改：

import java.util.List;

@RestController
@RequestMapping("/user")
public class UserController {

    @Autowired
    private UserService userService;

    // 新增和修改
    @PostMapping
    public boolean save(@RequestBody User user) {
        // 新增或者更新
        return userService.saveUser(user);
    }

    // 查询所有数据
    @GetMapping
    public List<User> findAll() {
        return userService.list();
    }

    @DeleteMapping("/{id}")
    public boolean delete(@PathVariable Integer id) {
        return userService.removeById(id);
    }

    @PostMapping("/del/batch")
    public boolean deleteBatch(@RequestBody List<Integer> ids) { // [1,2,3]
        return userService.removeByIds(ids);
    }

    // 分页查询
    //  接口路径：/user/page?pageNum=1&pageSize=10
    // @RequestParam接受
//    limit第一个参数 = (pageNum - 1) * pageSize
    // pageSize
//    @GetMapping("/page")
//    public Map<String, Object> findPage(@RequestParam Integer pageNum,
//                                        @RequestParam Integer pageSize,
//                                        @RequestParam String username) {
//        pageNum = (pageNum - 1) * pageSize;
//        username = "%" + username + "%";
//        List<User> data = userMapper.selectPage(pageNum, pageSize, username);
//        Integer total = userMapper.selectTotal(username);
//        Map<String, Object> res = new HashMap<>();
//        res.put("data", data);
//        res.put("total", total);
//        return res;
//    }

    // 分页查询 - mybatis-plus的方式
    @GetMapping("/page")
    public IPage<User> findPage(@RequestParam Integer pageNum,
                                @RequestParam Integer pageSize,
                                @RequestParam(defaultValue = "") String username,
                                @RequestParam(defaultValue = "") String email,
                                @RequestParam(defaultValue = "") String address) {
        IPage<User> page = new Page<>(pageNum, pageSize);
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        if (!"".equals(username)) {
            queryWrapper.like("username", username);
        }
        if (!"".equals(email)) {
            queryWrapper.like("email", email);
        }
        if (!"".equals(address)) {
            queryWrapper.like("address", address);
        }
        queryWrapper.orderByDesc("id");
        return userService.page(page, queryWrapper);
    }

}

8、切记！在request.js中把

  baseURL: '/api',

改成自己的路径

 baseURL: 'http://localhost:9090'

否则打开界面就一直显示没有数据！！！

最终实现的界面：

标签：username,Vue,return,SpringBoot,pageSize,res,request,后台,pageNum
来源： https://blog.csdn.net/m0_55633961/article/details/123597510