EasyPOI实现导入导出详解

EasyPOI导入导出Excel

基本操作

依赖

easypoi-base、easypoi-web、easypoi-annotation

相关注解

EasyPOI起因就是Excel的导入导出,最初的模板是实体和Excel的对应,model-row,filed-col,这样利用注解很容易完成导入导出。

• @ExcelTarget 用在类上,表示要导出为excel的目标对象,添加唯一标识,作用于最外层对象
• @Excel 作用在属性上,name表示导出到哪个标题行,replace,format,orderNum,width,type=2是图片
• @ExcelIgnore 作用在属性,表示忽略该字段导出
• @ExcelEntity 作用对象类型的属性,表示继续深入导出的实体,
• @ExcelCollection 作用在集合含对象类型的属性,表示一对多

导出代码实现

//1. 从数据库获取要导出的对象集合
List<User> userList = getUser();
//2. 导出excel
	//参数:1.exportParams 导出配置对象 参数2:导出类型 参数3:导出数据集合
Workbook workbook = ExcelExportUtil.exportExcel(new ExportParams("生成文件名","SheetName"),User.class,userList);
//3. 将excel写入指定位置
FileOuteputStream outputStream = new FileOutputStream("F://url");
workbook.write(outputStream);
outputStream.close();
workbook.close;

导入代码实现

//参数1：导入excel文件流 参数2：导入映射对象类型 参数3：导入配置对象
ImportParams param = new ImportParams();
param.setTitleRows(1);  //标题占几行
param.setHeadRows(2);   //文件头占几行
//param.setStartSheetIndex(1); //从第二个工作表中读取
//param.setSheetNum(3); //读取三个 sheet
param.setImportFields(new String[]{
     "姓名","年龄"});//验证是否是我们需要得excel
List<Employee> emps = ExcelImportUtil.importExcel(new FileInputStream("F:\\Development Code\\eclipse_workspace\\Kevin_maven\\员工import.xls"), Employee.class, param);
emps.forEach(System.out::println);

整合Springboot

项目环境搭建

1. 创建maven项目

2. 导入相关依赖

   
   <dependency>
       <groupId>org.mybatis.spring.bootgroupId>
       <artifactId>mybatis-spring-boot-starterartifactId>
       <version>2.1.4version>
   dependency>
   
   <dependency>
       <groupId>mysqlgroupId>
       <artifactId>mysql-connector-javaartifactId>
       <version>8.0.18version>
   dependency>
   
   <dependency>
       <groupId>com.alibabagroupId>
       <artifactId>druidartifactId>
       <version>1.2.3version>
   dependency>
   
   <dependency>
       <groupId>org.springframework.bootgroupId>
       <artifactId>spring-boot-starter-thymeleafartifactId>
   dependency>
   
   <dependency>
       <groupId>cn.afterturngroupId>
       <artifactId>easypoi-baseartifactId>
       <version>4.1.3version>
   dependency>
   <dependency>
       <groupId>org.projectlombokgroupId>
       <artifactId>lombokartifactId>
       <optional>trueoptional>
   dependency>
   

3. 配置端口及数据源和mapper位置

   server:
     port: 8001
   spring:
     application:
       name: test-kevin
     profiles:
       active: dev2
   
   #dev2 中配置
   #thymeleaf 缓存关闭
   spring:
     thymeleaf:
       cache: false
   
   #配置数据源
     datasource:
       type: com.alibaba.druid.pool.DruidDataSource
       driver-class-name: com.mysql.cj.jdbc.Driver
       url: jdbc:mysql://192.168.174.132:3306/test_2020?characterEncoding=utf-8
       username: root
       password: 123456
     #指定文件位置
     ##resources:
       #static-locations: classpath:/static/,file:${upload.dri}
   #指定mapper位置
   mybatis:
     mapper-locations: classpath:mybatis/mapper/*.xml
     # 实体扫描，多个package用逗号或者分号分隔
     type-aliases-package: com.yc.poi.entity
     configuration:
       # 驼峰下划线转换
       map-underscore-to-camel-case: true
   logging:
     level:
       root: info
       com.yc.poi.dao: debug
   
   #下载图片地址
   upload.dir: F:/Development Code/eclipse_workspace/Kevin_maven/src/main/resources/static/image
   

4. 创建数据库(目标数据)和对应实体

   建表sql

   CREATE TABLE `t_employee` (
     `id` int(50) NOT NULL AUTO_INCREMENT COMMENT '自增主键',
     `name` varchar(50) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL COMMENT '姓名',
     `age` int(5) DEFAULT NULL COMMENT '年龄',
     `birthday` datetime DEFAULT NULL COMMENT '生日',
     `cardNo` varchar(18) DEFAULT NULL COMMENT '身份证号码',
     `address` varchar(50) DEFAULT NULL COMMENT '籍贯',
     `status` varchar(4) DEFAULT NULL COMMENT '状态',
     `photo` varchar(40) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL COMMENT '头像',
     PRIMARY KEY (`id`)
   ) ENGINE=InnoDB AUTO_INCREMENT=12 DEFAULT CHARSET=utf8;
   

   实体

   @Data
   @ExcelTarget("employees")
   public class Employee {
          
       @Excel(name = "编号")
       private String id;
       @Excel(name = "头像" ,type = 2,width = 8,height =2,savePath = "F:\\Development Code\\eclipse_workspace\\Kevin_maven\\src\\main\\resources\\static\\image")
       private String photo;
       @Excel(name = "姓名")
       private String name;
       @Excel(name = "年龄")
       private Integer age;
       @Excel(name = "生日",format = "yyyy-MM-dd",width = 15)
       private Date birthday;
       @Excel(name = "身份证号码",width = 18)
       private String cardNo;
       @Excel(name = "籍贯",width = 15)
       private String address;
       @Excel(name = "状态",replace = {
          "激活_0","未激活_1"})
       private String status;
   }
   

Excel导入实现

编辑导入导出界面

<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>导入Excel主页面title>
    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css"
    integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg320mUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">
head>
<body>
<div class="container-fluid">
    <div class="row">
        <div class="col-md-12">
            <h1>选择Excel文件导入到数据库中h1>
            <form th:action="@{/empl/import}" method="post" enctype="multipart/form-data" class="form-inline">
                <div class="form-group">
                    <input class="form-control" type="file" name="excelFile"/>
                    <input type="submit" class="btn btn-danger" value="导入数据"/>
                div>
            form>
        div>
        <div class="col-md-12">
            <h1>显示导入数据列表h1>
            <table class="table table-bordered" >
                <tr>
                    <th>编号th>
                    <th>头像th>
                    <th>姓名th>
                    <th>年龄th>
                    <th>生日th>
                    <th>身份证号码th>
                    <th>籍贯th>
                    <th>状态th>
                tr>
                <tr th:each="empl : ${empls}">
                    <td th:text="${empl.id}">td>
                    <td><img th:src="${
      '/image/'+empl.photo}" style="height: 40px" alt="">td>
                    <td th:text="${empl.name}">td>
                    <td th:text="${empl.age}">td>
                    <td th:text="${#dates.format(empl.birthday,'yyyy-MM-dd')}">td>
                    <td th:text="${empl.cardNo}">td>
                    <td th:text="${empl.address}">td>
                    <td th:text="${empl.status}">td>
                tr>
            table>
            <hr>
            <a th:href="@{/empl/export}"  class="btn btn-info">导出Excel文件a>
        div>
    div>
div>
body>
html>

查询数据

@Controller
@RequestMapping("/empl")
@Slf4j
public class EmployeeController {
     

    @Autowired
    private EmployeeService employeeService;

    @Value("${upload.dir}")
    private String realPath;
    /**
     * 查询所有员工信息
     * @param model
     * @return
     */
    @RequestMapping("findAll")
    public String findAll(Model model) {
     
        List<Employee> empls = employeeService.findAll();
        model.addAttribute("empls", empls);
        return "index";
    }
}

导入代码

/**
 * 导入Excel文件
 */
@RequestMapping("import")
public String importExcel(MultipartFile excelFile){
     
    log.info("文件名:[{}]",excelFile.getOriginalFilename());
    try {
     
        ImportParams param = new ImportParams();
        param.setTitleRows(1);
        param.setHeadRows(2);
        List<Employee> empls = ExcelImportUtil.importExcel(excelFile.getInputStream(), Employee.class, param);
        int i = employeeService.addEmpls(empls);
    } catch (Exception e) {
     
        e.printStackTrace();
        log.error("导入失败");
    }
    return  "redirect:/empl/findAll";//上传完成重定向到查询所有路径
}

Excel导出实现

/**
 * 导出Excel文件
 */
@RequestMapping("/export")
public void ExportExcel(HttpServletResponse response){
     
    List<Employee> empls = employeeService.findAll();
    //设置图片下载路径
    empls.forEach(empl ->{
     
        empl.setPhoto(realPath+'/'+empl.getPhoto());
    });
    log.info("导出当前excel数据为：[{}]",empls.size());
    try {
     
        //将数据对象导出为工作簿
        Workbook sheets = ExcelExportUtil.exportExcel(new ExportParams("导出测试员工目录", "测试工作薄"), Employee.class, empls);
        //设置请求头
        response.setHeader("content-disposition","attachment;fileName="+ URLEncoder.encode("员工表.xls","UTF-8"));
        ServletOutputStream outputStream = response.getOutputStream();
        sheets.write(outputStream);
        outputStream.close();
        sheets.close();
    } catch (IOException e) {
     
        e.printStackTrace();
        log.error("导出失败");
    }
}

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