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一、数据字典导出

1. 导出接口封装

A、在 model 模块添加导出实体

在 model 模块查看实体：com.fancy.yygh.vo.cmn.DictEeVo

package com.fancy.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;

}

2. 在 service-cmn 模块添加 service 方法

A、在 DictService 类添加接口

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

B、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

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. 测试

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

5. 导出前端实现

A、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="primary" @click="exportData"><i class="fa fa-plus"/> 导出</el-button>
	</div>
</div>

B、添加导出方法

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

C、测试

二、数据字典导入

1. 导入接口封装

A、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) {

    }
}

B、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();
    }
}

C、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();
}

2. 导入前端实现

A、列表页面添加导入按钮

src/views/cmn/dict/list.vue

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

说明：按钮位置与导出并列

B、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>

C、添加弹出可见模型

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

D、添加方法

importData() {
	this.dialogImportVisible = true
},

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