二、数据字典开发

1、搭建service-cmn模块

1.1 搭建service-cmn模块

搭建过程参考service-hosp模块

1.2 修改配置

修改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>com.atguigu.yygh</groupId>
<artifactId>service</artifactId>
<version>1.0</version>
</parent>

<version>1.0</version>
<artifactId>service-cmn</artifactId>
<packaging>jar</packaging>
<name>service-cmn</name>
<description>service-cmn</description>

<dependencies>
</dependencies>

<build>
<finalName>service-cmn</finalName>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>

</project>

1、添加配置文件application.properties

# 服务端口
server.port=8202
# 服务名
spring.application.name=service-cmn

# 环境设置：dev、test、prod
spring.profiles.active=dev

# mysql数据库连接
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://192.168.44.165:3306/yygh_cmn?characterEncoding=utf-8&useSSL=false
spring.datasource.username=root
spring.datasource.password=root123

#返回json的全局时间格式
spring.jackson.date-format=yyyy-MM-dd HH:mm:ss
spring.jackson.time-zone=GMT+8

1.3 启动类

package com.atguigu.yygh;

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

2、数据字典列表

根据element组件要求，返回列表数据必须包含hasChildren字典，如图：
https://element.eleme.cn/#/zh-CN/component/table

2.1 数据字典列表接口

2.1.1 model模块添加数据字典实体

在model模块查看实体：com.atguigu.yygh.model.cmn.Dict

@Data
@ApiModel(description = "数据字典")
@TableName("dict")
public class Dict extends BaseEntity {

    private static final long serialVersionUID = 1L;

    @ApiModelProperty(value = "上级id")
    @TableField("parent_id")
    private Long parentId;

    @ApiModelProperty(value = "名称")
    @TableField("name")
    private String name;

    @ApiModelProperty(value = "值")
    @TableField("value")
    private String value;

    @ApiModelProperty(value = "编码")
    @TableField("dict_code")
    private String dictCode;

    @ApiModelProperty(value = "是否包含子节点")
    @TableField(exist = false)
    private boolean hasChildren;
}

说明：hasChildren为树形组件所需字典，标识为数据库表不存在该字段

2.1.2 添加数据字典mapper

1、添加com.atguigu.yygh.cmn.mapper.DictMapper

public interface DictMapper extends BaseMapper<Dict> {
}

2、添加com.atguigu.yygh.cmn.service.impl.DictServiceImpl接口实现

@Service
public class DictServiceImpl extends ServiceImpl<DictMapper, Dict> implements DictService {
    //根据数据id查询子数据列表
    @Override
    public List<Dict> findChlidData(Long id) {
        QueryWrapper<Dict> wrapper = new QueryWrapper<>();
        wrapper.eq("parent_id",id);
        List<Dict> dictList = baseMapper.selectList(wrapper);
        //向list集合每个dict对象中设置hasChildren
        for (Dict dict:dictList) {
            Long dictId = dict.getId();
            boolean isChild = this.isChildren(dictId);
            dict.setHasChildren(isChild);
        }
        return dictList;
    }
    //判断id下面是否有子节点
    private boolean isChildren(Long id) {
        QueryWrapper<Dict> wrapper = new QueryWrapper<>();
        wrapper.eq("parent_id",id);
        Integer count = baseMapper.selectCount(wrapper);
        // 0>0    1>0
        return count>0;
    }
}

2.1.4 添加数据字典controller

添加com.atguigu.yygh.cmn.controller.DictController

@Api(description = "数据字典接口")
@RestController
@RequestMapping("/admin/cmn/dict")
public class DictController {

    @Autowired
    private DictService dictService;

    //根据数据id查询子数据列表
    @ApiOperation(value = "根据数据id查询子数据列表")
    @GetMapping("findChildData/{id}")
    public Result findChildData(@PathVariable Long id) {
        List<Dict> list = dictService.findChlidData(id);
        return Result.ok(list);
    }
}

2.2 数据字典列表前端

2.2.1 添加路由

在 src/router/index.js 文件添加路由

  {
    path: '/cmn',
    component: Layout,
    redirect: '/cmn/list',
    name: '数据管理',
    alwaysShow: true,
    meta: { title: '数据管理', icon: 'example' },
    children: [
      {
        path: 'list',
        name: '数据字典',
        component: () => import('@/views/dict/list'),
        meta: { title: '数据字典', icon: 'table' }
      }
    ]
  },

说明：列表与查看都添加了

2.2.2 定义api

创建文件 src/api/cmn/dict.js

export default {
  dictList(id) {//数据字典列表
    return request ({
      url: `/admin/cmn/dict/findChildData/${id}`,
      method: 'get'
    })
  }
}

2.2.2 方法调用

<script>
import dict from '@/api/dict'
export default {
    data() {
        return {
            list:[] //数据字典列表数组
        }
    },
    created() {
        this.getDictList(1)
    },
    methods: {
        //数据字典列表
        getDictList(id) {
            dict.dictList(id)
                .then(response => {
                    this.list = response.data
                })
        },
        getChildrens(tree, treeNode, resolve) {
            dict.dictList(tree.id).then(response => {
                resolve(response.data)
            })
        }
    }
}
</script>

2.2.3 表格渲染

<template>
    <div class="app-container">
        <el-table
        :data="list"
        style="width: 100%"
        row-key="id"
        border
        lazy
        :load="getChildrens"
        :tree-props="{children: 'children', hasChildren: 'hasChildren'}">
            <el-table-column label="名称" width="230" align="left">
            <template slot-scope="scope">
            <span>{{ scope.row.name }}</span>
            </template>
            </el-table-column>

            <el-table-column label="编码" width="220">
            <template slot-scope="{row}">
                    {{ row.dictCode }}
            </template>
            </el-table-column>
            <el-table-column label="值" width="230" align="left">
            <template slot-scope="scope">
            <span>{{ scope.row.value }}</span>
            </template>
            </el-table-column>
            <el-table-column label="创建时间" align="center">
            <template slot-scope="scope">
            <span>{{ scope.row.createTime }}</span>
            </template>
            </el-table-column>
        </el-table>
    </div>
</template>

3、EasyExcel介绍

EasyExcel介绍

4、数据字典导出

4.1 导出接口封装

4.1.1 在model模块添加导出实体
在model模块查看实体：com.atguigu.yygh.vo.cmn.DictEeVo

package com.atguigu.yygh.vo.cmn;

@Data
public class DictEeVo {

@ExcelProperty(value = "id",index = 0)
private Long id;

@ExcelProperty(value = "上级id",index = 1)
private Long parentId;

@ExcelProperty(value = "名称",index = 2)
private String name;

@ExcelProperty(value = "值",index = 3)
private String value;

@ExcelProperty(value = "编码",index = 4)
private String dictCode;

}

4.1.2 在service-cmn模块添加service方法

1、在DictService类添加接口

/**
 * 导出
 * @param response
*/
void exportData(HttpServletResponse response);

2、在DictServiceImpl类添加接口实现类

@Override
public void exportData(HttpServletResponse response) {
try {
      response.setContentType("application/vnd.ms-excel");
      response.setCharacterEncoding("utf-8");
// 这里URLEncoder.encode可以防止中文乱码 当然和easyexcel没有关系
String fileName = URLEncoder.encode("数据字典", "UTF-8");
      response.setHeader("Content-disposition", "attachment;filename="+ fileName + ".xlsx");

      List<Dict> dictList = dictMapper.selectList(null);
      List<DictEeVo> dictVoList = new ArrayList<>(dictList.size());
for(Dict dict : dictList) {
         DictEeVo dictVo = new DictEeVo();
         BeanUtils.copyBean(dict, dictVo, DictEeVo.class);
         dictVoList.add(dictVo);
      }

      EasyExcel.write(response.getOutputStream(), DictEeVo.class).sheet("数据字典").doWrite(dictVoList);
   } catch (IOException e) {
      e.printStackTrace();
   }
}

说明：直接复制示例代码中的“web中的写”，改造即可

4.1.3 在service-cmn模块添加controller方法

在DictController类添加方法

@ApiOperation(value="导出")
@GetMapping(value = "/exportData")
public void exportData(HttpServletResponse response) {
dictService.exportData(response);
}

4.1.4 测试

直接通过浏览器导出数据：http://localhost:8202/admin/cmn/dict/exportData

4.2 导出前端实现

4.2.1 列表页面添加导出按钮

src/views/cmn/dict/list.vue

<div class="el-toolbar">
<div class="el-toolbar-body"style="justify-content: flex-start;">
<el-button type="text"@click="exportData"><i class="fa fa-plus"/> 导出</el-button>
</div>
</div>

4.2.2 添加导出方法

exportData() {
window.location.href = 'http://localhost:8202/admin/cmn/dict/exportData'
}

4.2.1 测试

5、数据字典导入

5.1 导入接口封装

5.1.1 创建回调监听器

public class DictListener extends AnalysisEventListener<DictEeVo> {

    private DictMapper dictMapper;
    public DictListener(DictMapper dictMapper) {
        this.dictMapper = dictMapper;
    }

    //一行一行读取
    @Override
    public void invoke(DictEeVo dictEeVo, AnalysisContext analysisContext) {
        //调用方法添加数据库
        Dict dict = new Dict();
        BeanUtils.copyProperties(dictEeVo,dict);
        dictMapper.insert(dict);
    }
    @Override
    public void doAfterAllAnalysed(AnalysisContext analysisContext) {

    }
}

5.1.2 在service-cmn模块添加service方法

//导入数据字典
@Override
public void importDictData(MultipartFile file) {
    try {
        EasyExcel.read(file.getInputStream(),DictEeVo.class,new DictListener(baseMapper)).sheet().doRead();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

5.1.3 在service-cmn模块添加controller方法

在DictController类添加方法

@ApiOperation(value = "导入")
@PostMapping("importData")
public Result importData(MultipartFile file) {
 dictService.importData(file);
 return Result.ok();
}

5.2 导入前端实现

5.2.1 列表页面添加导入按钮

src/views/cmn/dict/list.vue

<el-button type="text"@click="importData"><i class="fa fa-plus"/> 导入</el-button>

说明：按钮位置与导出并列

5.2.2 添加导入弹出层

<el-dialog title="导入":visible.sync="dialogImportVisible"width="480px">
<el-form label-position="right"label-width="170px">

<el-form-item label="文件">
<el-upload
:multiple="false"
:on-success="onUploadSuccess"
:action="'http://localhost:8202/admin/cmn/dict/importData'"
class="upload-demo">
<el-button size="small"type="primary">点击上传</el-button>
<div slot="tip"class="el-upload__tip">只能上传xls文件，且不超过500kb</div>
</el-upload>
</el-form-item>

</el-form>
<div slot="footer"class="dialog-footer">
<el-button @click="dialogImportVisible = false">
      取消
</el-button>
</div>
</el-dialog>

5.2.3 添加弹出可见模型

// 定义数据
data() {
return {
list: [],
listLoading: true,
dialogImportVisible: false
}
}

5.2.4 添加方法

importData() {
this.dialogImportVisible = true
},

onUploadSuccess(response, file) {
this.$message.info('上传成功')
this.dialogImportVisible = false
  this.fetchData()
}