springMVC+easypoi做exce的导入导出

1.认识

Java操作办公软件：jxl、poi

数据读取用POI，只要不涉及单元格样式的写入使用jxl效率高点。POI读取效率高，但是大数据量写入Excel效率比jxl慢。

jxl只使用03版本、po使用所有版本

2.easypoi需要导入的jar包

 1 <dependency>
 2       <groupId>cn.afterturn</groupId>
 3       <artifactId>easypoi-base</artifactId>
 4       <version>3.2.0</version>
 5     </dependency>
 6     <dependency>
 7       <groupId>cn.afterturn</groupId>
 8       <artifactId>easypoi-web</artifactId>
 9       <version>3.2.0</version>
10     </dependency>
11     <dependency>
12       <groupId>cn.afterturn</groupId>
13       <artifactId>easypoi-annotation</artifactId>
14       <version>3.2.0</version>
15     </dependency>

1  <!-- JSR 303 规范验证包 Excel验证-->
2     <dependency>
3       <groupId>org.hibernate</groupId>
4       <artifactId>hibernate-validator</artifactId>
5       <version>5.2.4.Final</version>
6     </dependency>

3.在需要操作的实体类进行配置注解

@Excel注解为需要导入或是导出的数据、name为表头、

注意：type=2表示为图片、format可以设置日期格式

 2 public class Employee extends BaseDomain{
 3     @Excel(name = "用户名")
 4     @NotNull(message = "用户名不能为空")
 5     private String username;
 6     private String password;
 7     @Excel(name = "邮箱",width = 20)
 8     private String email;
 9     @Excel(name = "年龄")
10     @Max(value = 60,message = "年龄不能大于60")
11     @Min(value = 18,message = "年龄不能小于18")
12     private Integer age;
13     @Excel(name = "头像",type = 2,height = 30)
14     private String headImage;

4.在applicationContex中配置view

1 <!--Excel导出的视图解析器-->
2     <bean class="org.springframework.web.servlet.view.BeanNameViewResolver" p:order="0"></bean>
3     <!--扫描Excel的view-->
4     <context:component-scan base-package="cn.afterturn.easypoi.view"/>

5.导出

 1 public String exportExcel(ModelMap map, SystemlogQuery query){
 2         //拿到数据
 3         List<Systemlog> list = systemlogService.findAll();
 4         ExportParams params = new ExportParams("日志数据", "日志表", ExcelType.XSSF);
 5 //        params.setFreezeCol(5); //冻结  那条绿线
 6         map.put(NormalExcelConstants.DATA_LIST, list); // 数据集合
 7         map.put(NormalExcelConstants.CLASS, Systemlog.class);//导出实体
 8         map.put(NormalExcelConstants.PARAMS, params);//参数
 9         map.put(NormalExcelConstants.FILE_NAME, "日志信息");//文件名称
10         return  NormalExcelConstants.EASYPOI_EXCEL_VIEW;//需要配置新的视图解析器并设置优先级和扫描
11     }

6.导入

 1  //empFile名字与前台一致
 2     public String importXlsx(MultipartFile empFile,HttpServletResponse response) throws Exception{
 3         //获取参数
 4         ImportParams params = new ImportParams();
 5         params.setHeadRows(1); //不要这行
 6         //验证开启
 7         params.setNeedVerfiy(true);
 8         //自定义验证
 9         params.setVerifyHandler(employeeExcelVerifyHandler);
10         //导入参数
11         /*List<Employee> list = ExcelImportUtil.importExcel(
12                 empFile.getInputStream(),
13                 Employee.class, params);*/
14         ExcelImportResult<Employee> result = ExcelImportUtil.importExcelMore(
15                 empFile.getInputStream(),
16                 Employee.class, params);
17 
18         //获取正确导入的集合
19         List<Employee> list = result.getList();
20         for (Employee employee : list) {
21             employee.setPassword("123"); //默认密码123
22             if(employee.getDepartment()!=null) {
23                 //设置部门
24                 Department department = departmentService.findByName(employee.getDepartment().getName());
25                 employee.setDepartment(department);
26             }
27 
28             employeeService.save(employee);
29         }
30         //如果导入失败
31         if(result.isVerfiyFail()){
32             //获取导入失败的员工的Excel
33             Workbook failWorkbook = result.getFailWorkbook();
34             //导出Excel表
35             //获取输出流
36             ServletOutputStream fos = response.getOutputStream();
37             //响应类型
38             response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"); //mime类型
39             //告诉浏览器这是下载
40             response.setHeader("Content-disposition", "attachment;filename=errorx.xlsx");
41             //不要缓存
42             response.setHeader("Pragma", "No-cache");
43             failWorkbook.write(fos);
44             fos.flush();
45             fos.close();
46         }
47         return "import";
48     }