• 【springboot+easypoi】一行代码搞定excel导入导出


    原文:https://www.jianshu.com/p/5d67fb720ece

    • 开发中经常会遇到excel的处理,导入导出解析等等,java中比较流行的用poi,但是每次都要写大段工具类来搞定这事儿,此处推荐一个别人造好的轮子【easypoi】,下面介绍下“轮子”的使用。

    pom引入

    • 不再需要其他jar
           <dependency>
                <groupId>cn.afterturn</groupId>
                <artifactId>easypoi-base</artifactId>
                <version>3.0.3</version>
            </dependency>
            <dependency>
                <groupId>cn.afterturn</groupId>
                <artifactId>easypoi-web</artifactId>
                <version>3.0.3</version>
            </dependency>
            <dependency>
                <groupId>cn.afterturn</groupId>
                <artifactId>easypoi-annotation</artifactId>
                <version>3.0.3</version>
            </dependency>
    

    编写实体类

    • 此处注意必须要有空构造函数,否则会报错“对象创建错误”
    • 关于注解@Excel,其他还有@ExcelCollection,@ExcelEntity ,@ExcelIgnore,@ExcelTarget等,此处我们用不到,可以去官方查看更多
    属性类型类型说明
    name String null 列名
    needMerge boolean fasle 纵向合并单元格
    orderNum String "0" 列的排序,支持name_id
    replace String[] {} 值得替换 导出是{a_id,b_id} 导入反过来
    savePath String "upload" 导入文件保存路径
    type int 1 导出类型 1 是文本 2 是图片,3 是函数,10 是数字 默认是文本
    width double 10 列宽
    height double 10 列高,后期打算统一使用@ExcelTarget的height,这个会被废弃,注意
    isStatistics boolean fasle 自动统计数据,在追加一行统计,把所有数据都和输出这个处理会吞没异常,请注意这一点
    isHyperlink boolean false 超链接,如果是需要实现接口返回对象
    isImportField boolean true 校验字段,看看这个字段是不是导入的Excel中有,如果没有说明是错误的Excel,读取失败,支持name_id
    exportFormat String "" 导出的时间格式,以这个是否为空来判断是否需要格式化日期
    importFormat String "" 导入的时间格式,以这个是否为空来判断是否需要格式化日期
    format String "" 时间格式,相当于同时设置了exportFormat 和 importFormat
    databaseFormat String "yyyyMMddHHmmss" 导出时间设置,如果字段是Date类型则不需要设置 数据库如果是string 类型,这个需要设置这个数据库格式,用以转换时间格式输出
    numFormat String "" 数字格式化,参数是Pattern,使用的对象是DecimalFormat
    imageType int 1 导出类型 1 从file读取 2 是从数据库中读取 默认是文件 同样导入也是一样的
    suffix String "" 文字后缀,如% 90 变成90%
    isWrap boolean true 是否换行 即支持
    mergeRely int[] {} 合并单元格依赖关系,比如第二列合并是基于第一列 则{1}就可以了
    mergeVertical boolean fasle 纵向合并内容相同的单元格
    import cn.afterturn.easypoi.excel.annotation.Excel;
    
    import java.util.Date;
    
    public class Person {
    
        @Excel(name = "姓名", orderNum = "0")
        private String name;
    
        @Excel(name = "性别", replace = {"男_1", "女_2"}, orderNum = "1")
        private String sex;
    
        @Excel(name = "生日", exportFormat = "yyyy-MM-dd", orderNum = "2")
        private Date birthday;
    
        public Person(String name, String sex, Date birthday) {
            this.name = name;
            this.sex = sex;
            this.birthday = birthday;
        }
    
        public String getName() {
            return name;
        }
    
        public void setName(String name) {
            this.name = name;
        }
    
        public String getSex() {
            return sex;
        }
    
        public void setSex(String sex) {
            this.sex = sex;
        }
    
        public Date getBirthday() {
            return birthday;
        }
    
        public void setBirthday(Date birthday) {
            this.birthday = birthday;
        }
    }
    

    导入导出公用方法

    public static void exportExcel(List<?> list, String title, String sheetName, Class<?> pojoClass,String fileName,boolean isCreateHeader, HttpServletResponse response){
            ExportParams exportParams = new ExportParams(title, sheetName);
            exportParams.setCreateHeadRows(isCreateHeader);
            defaultExport(list, pojoClass, fileName, response, exportParams);
    
        }
        public static void exportExcel(List<?> list, String title, String sheetName, Class<?> pojoClass,String fileName, HttpServletResponse response){
            defaultExport(list, pojoClass, fileName, response, new ExportParams(title, sheetName));
        }
    public static void exportExcel(List<Map<String, Object>> list, String fileName, HttpServletResponse response){
            defaultExport(list, fileName, response);
        }
    
        private static void defaultExport(List<?> list, Class<?> pojoClass, String fileName, HttpServletResponse response, ExportParams exportParams) {
            Workbook workbook = ExcelExportUtil.exportExcel(exportParams,pojoClass,list);
            if (workbook != null);
            downLoadExcel(fileName, response, workbook);
        }
    
        private static void downLoadExcel(String fileName, HttpServletResponse response, Workbook workbook) {
            try {
                response.setCharacterEncoding("UTF-8");
                response.setHeader("content-Type", "application/vnd.ms-excel");
                response.setHeader("Content-Disposition",
                        "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8"));
                workbook.write(response.getOutputStream());
            } catch (IOException e) {
                throw new NormalException(e.getMessage());
            }
        }
    private static void defaultExport(List<Map<String, Object>> list, String fileName, HttpServletResponse response) {
            Workbook workbook = ExcelExportUtil.exportExcel(list, ExcelType.HSSF);
            if (workbook != null);
            downLoadExcel(fileName, response, workbook);
        }
    
        public static <T> List<T> importExcel(String filePath,Integer titleRows,Integer headerRows, Class<T> pojoClass){
            if (StringUtils.isBlank(filePath)){
                return null;
            }
            ImportParams params = new ImportParams();
            params.setTitleRows(titleRows);
            params.setHeadRows(headerRows);
            List<T> list = null;
            try {
                list = ExcelImportUtil.importExcel(new File(filePath), pojoClass, params);
            }catch (NoSuchElementException e){
                throw new NormalException("模板不能为空");
            } catch (Exception e) {
                e.printStackTrace();
                throw new NormalException(e.getMessage());
            }
            return list;
        }
        public static <T> List<T> importExcel(MultipartFile file, Integer titleRows, Integer headerRows, Class<T> pojoClass){
            if (file == null){
                return null;
            }
            ImportParams params = new ImportParams();
            params.setTitleRows(titleRows);
            params.setHeadRows(headerRows);
            List<T> list = null;
            try {
                list = ExcelImportUtil.importExcel(file.getInputStream(), pojoClass, params);
            }catch (NoSuchElementException e){
                throw new NormalException("excel文件不能为空");
            } catch (Exception e) {
                throw new NormalException(e.getMessage());
            }
            return list;
        }
    

    对的,没看错,这就可以导出导入了,看起来代码挺多,其实是提供了多个导入导出方法而已

    测试

      @RequestMapping("export")
        public void export(HttpServletResponse response){
    
            //模拟从数据库获取需要导出的数据
            List<Person> personList = new ArrayList<>();
            Person person1 = new Person("路飞","1",new Date());
            Person person2 = new Person("娜美","2", DateUtils.addDate(new Date(),3));
            Person person3 = new Person("索隆","1", DateUtils.addDate(new Date(),10));
            Person person4 = new Person("小狸猫","1", DateUtils.addDate(new Date(),-10));
            personList.add(person1);
            personList.add(person2);
            personList.add(person3);
            personList.add(person4);
    
            //导出操作
            FileUtil.exportExcel(personList,"花名册","草帽一伙",Person.class,"海贼王.xls",response);
        }
    
        @RequestMapping("importExcel")
        public void importExcel(){
            String filePath = "F:\海贼王.xls";
            //解析excel,
            List<Person> personList = FileUtil.importExcel(filePath,1,1,Person.class);
            //也可以使用MultipartFile,使用 FileUtil.importExcel(MultipartFile file, Integer titleRows, Integer headerRows, Class<T> pojoClass)导入
            System.out.println("导入数据一共【"+personList.size()+"】行");
    
            //TODO 保存数据库
        }
    

    导出结果

     
    导出结果

    测试导入

    导出结果再添加一行,执行,输出导入数据行数


     


    作者:小尘哥
    链接:https://www.jianshu.com/p/5d67fb720ece
    來源:简书
    简书著作权归作者所有,任何形式的转载都请联系作者获得授权并注明出处。
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  • 原文地址:https://www.cnblogs.com/shihaiming/p/9415102.html
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