EasyPOI导入导出

其他 2019-04-17 23:18:07 阅读次数: 0

一、POI实现导入导出

1.引入依赖

<dependency>
  <groupId>org.apache.poi</groupId>
  <artifactId>poi</artifactId>
  <version>3.11</version>
</dependency>
<dependency>
  <groupId>org.apache.poi</groupId>
  <artifactId>poi-ooxml</artifactId>
  <version>3.11</version>
</dependency

2.Excel的创建和导出

创建Excel以99乘法表为例

public class ExcelTest {

    //创建一个Excel文件
    //在文件里加一个99乘法法
    //把这文件保存在项目中
    @Test
    public void testCreateExcel() throws Exception{
        //1.创建一个Excel文件(内存中)
        SXSSFWorkbook wb = new SXSSFWorkbook();
        //2.创建一张表
        Sheet sheet = wb.createSheet("99乘法表");
        //3.创建行
        for (int i = 1; i <= 9; i++) {
            Row row = sheet.createRow(i-1);
            //4.创建列(格子)
            for (int j = 1; j <= i; j++) {
                Cell cell = row.createCell(j-1);
                //5.格子中加数据
                cell.setCellValue(i+"*"+j+"="+(i*j));
            }
        }
        //从内存中写出来
        FileOutputStream out = new FileOutputStream("99.xlsx");
        wb.write(out);
        out.close();
    }
}

读取Excel

@Test
public void readExcel() throws Exception{
    File file = new File("employee-3.xlsx");
    FileInputStream fis = new FileInputStream(file);
    //1.读取一个Excel文件(内存中)
    Workbook wb = new XSSFWorkbook(fis);
    //2.拿到第个sheet表
    Sheet sheet = wb.getSheetAt(0);
    //3.拿到wb中的行(不要拿头部)
    int lastRowNum = sheet.getLastRowNum();
    for (int i = 1; i <= lastRowNum; i++) {
        Row row = sheet.getRow(i);
        //4.拿到每一列(格子)
        short lastCellNum = row.getLastCellNum();
        for (int j = 0; j < lastCellNum; j++) {
            Cell cell = row.getCell(j);
            System.out.print(cell.getStringCellValue()+" ");
        }
        System.out.println();
    }
}

3.SpringMVC导出

设置下载配置

//下面设置好直接使用即可导出
 response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"); //mime类型
 response.setHeader("Content-disposition", "attachment;filename="+filename);
 response.setHeader("Pragma", "No-cache");//设置不要缓存
 OutputStream ouputStream = response.getOutputStream();
 wb.write(ouputStream);
 ouputStream.flush();
 ouputStream.close();

导出js页面设置

<a href="/employee/download "  class="easyui-linkbutton" iconCls="icon-redo" plain="true">导出</a>

导出Controller实现

@RequestMapping("/download")
public void download(HttpServletResponse response) throws Exception{
    //准备下载的文件名
    String filename = "employee.xlsx";
    response.setHeader("Content-disposition", filename);
    response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"); //mime类型
    response.setHeader("Content-disposition", "attachment;filename="+filename);
    response.setHeader("Pragma", "No-cache");

    //1.创建一个Excel文件(内存中)
    SXSSFWorkbook wb = new SXSSFWorkbook();
    //2.创建一张表
    Sheet sheet = wb.createSheet("99乘法表");
    //3.创建行
    for (int i = 1; i <= 9; i++) {
        Row row = sheet.createRow(i-1);
        //4.创建列(格子)
        for (int j = 1; j <= i; j++) {
            Cell cell = row.createCell(j-1);
            //5.格子中加数据
            cell.setCellValue(i+"*"+j+"="+(i*j));
        }
    }
    //从内存中写出来
    OutputStream out = response.getOutputStream();
    wb.write(out);
    out.close();
}

4.EasyPOI导入导出Excel

引入依赖（和POI的冲突）

<!-- easypoi的支持 -->
<dependency>
  <groupId>cn.afterturn</groupId>
  <artifactId>easypoi-base</artifactId>
  <version>3.2.0</version>
</dependency>
<dependency>
  <groupId>cn.afterturn</groupId>
  <artifactId>easypoi-web</artifactId>
  <version>3.2.0</version>
</dependency>
<dependency>
  <groupId>cn.afterturn</groupId>
  <artifactId>easypoi-annotation</artifactId>
  <version>3.2.0</version>
</dependency>

准备一个类

public class Employee implements Serializable {

    private Long id;
    @Excel(name = "用户名称")
    private String username;
    @Excel(name = "邮件",width = 20)
    private String email;
   // 省略了getter,setter
}

EasyPOI导出测试

@Test
public void testExcel() throws Exception{
    //准备员工数据
    Employee e1 = new Employee();
    e1.setId(1L);
    e1.setUsername("张三");
    e1.setEmail("[email protected]");
    Employee e2 = new Employee();
    e2.setId(2L);
    e2.setUsername("李四");
    e2.setEmail("[email protected]");

    List<Employee> list = new ArrayList<>();
    list.add(e1);
    list.add(e2);

    /**
     * 进行相应的展出
     *  参数1:一些基本配置(表头等)
     *  参数2:导出的类型
     *  参数3:导出的数据
     */
    Workbook workbook = ExcelExportUtil.exportExcel(new ExportParams(),
            Employee.class, list);

    //保存数据
    FileOutputStream fos = new FileOutputStream("emp.xls");
    workbook.write(fos);
    fos.close();

}

问题：类中的字段是Boolean或者对象怎么办？

@ExcelTarget(value="emp")//注意要在类名上面加这个注解
public class Employee {
@Excel
private Integer age = 18;

@Excel(name = "性别",replace={"男_true","女_false"})
private Boolean sex = true;

@ExcelEntity（id="dept"）  //对应另一个关连对象
private Department department;
                
@Excel(name="头像",type = 2) //type = 2 ：代表这个一个图片展示
private String headImage;
@ExcelTarget(value="dept")
public class Department {

    //部门名称
    @Excel(name="部门名称_emp,名称_dept")
    private String name;

代码测试

Department department1 = new Department();
department1.setId(1L);
department1.setName("教学部");

Department department2 = new Department();
department2.setId(2L);
department2.setName("IT部");

//准备员工数据
Employee e1 = new Employee();
e1.setId(1L);
e1.setUsername("张三");
e1.setEmail("[email protected]");
e1.setDepartment(department1);
e1.setHeadImage("images/user.png");

Employee e2 = new Employee();
e2.setId(2L);
e2.setUsername("李四");
e2.setEmail("[email protected]");
e2.setDepartment(department2);
e2.setHeadImage("images/user-red.png");

List<Employee> list = new ArrayList<>();
list.add(e1);
list.add(e2);

/**
 * 进行相应的展出
 *  参数1:一些基本配置(表头等)
 *  参数2:导出的类型
 *  参数3:导出的数据
 */
Workbook workbook = ExcelExportUtil.exportExcel(new ExportParams("员工信息","员工数据"),
        Employee.class, list);

//保存数据
FileOutputStream fos = new FileOutputStream("emp.xls");
workbook.write(fos);
fos.close();

controller实现

@RequestMapping("/download")
public String download(ModelMap map,EmployeeQuery query, HttpServletRequest request) {
    //拿到所有数据
    List<Employee> list = employeeService.findByQuery(query);
    //获取到真实路径
//解决了下载的图片的路径问题
    String realPath = request.getServletContext().getRealPath("");
    list.forEach(e -> {
        e.setHeadImage(realPath+e.getHeadImage());
        System.out.println(e.getHeadImage());
    });

    //设置一些属性
    ExportParams params = new ExportParams("员工管理", "明细", ExcelType.XSSF);
    //params.setFreezeCol(3);
    map.put(NormalExcelConstants.DATA_LIST, list); // 数据集合
    map.put(NormalExcelConstants.CLASS, Employee.class);//导出实体
    map.put(NormalExcelConstants.PARAMS, params);//参数
    map.put(NormalExcelConstants.FILE_NAME, "employee");//文件名称
    //返回的名称 :easypoiExcelView -> 并没有找我的bean，而且当做一个路径去进行访问
    //  现在默认去找的视图解析器，而没有找我的那一个bean
    return NormalExcelConstants.EASYPOI_EXCEL_VIEW;//View名称
}

特别注意:要使用  return NormalExcelConstants.EASYPOI_EXCEL_VIEW

spring的.xml 需要加上：

<!-- 扫描easypoi的一些view:视图 -->
<context:component-scan base-package="cn.afterturn.easypoi.view" />
<!-- bean的视图解析器  p:order="0":顺序在最前面 -->
<bean id="beanNameViewResolver" class="org.springframework.web.servlet.view.BeanNameViewResolver"
      p:order="0" />

EasyPOI导入

导入页面

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
    <%@include file="/WEB-INF/views/head.jsp" %>
</head>
<body>
    <!-- 上传必需是:post，enctype="multipart/form-data"-->
    <form action="/import/employeeXlsx" method="post" enctype="multipart/form-data">
        <input class="easyui-filebox" name="empFile" style="width:80%"
               data-options="prompt:'选择一个文件...',buttonText: '选择文件'" />
        <button class="easyui-linkbutton">导入</button>
    </form>
</body>
</html>

设置验证

<!-- JSR 303 规范验证包 -->
<dependency>
  <groupId>org.hibernate</groupId>
  <artifactId>hibernate-validator</artifactId>
  <version>5.2.4.Final</version>
</dependency>
@Excel(name="用户名")
@NotNull(message = "用户名不为空")
private String username;
private String password;
@Excel(name="邮件",width = 25)
private String email;
@Excel(name="年纪")
@Max(value = 80,message = "max 最大值不能超过80")
private Integer age;

controller实现

@RequestMapping("/employeeXlsx")
    public String employeeXlsx(MultipartFile empFile, HttpServletResponse response) throws Exception {
        //准备导入的参数
        ImportParams params = new ImportParams();
        params.setTitleRows(1);
        // need:需要  verfiy:核实,验证
        params.setNeedVerfiy(true); //需要验证

        //excel导入的一个结果
        ExcelImportResult<Employee> result = ExcelImportUtil.importExcelMore(
                empFile.getInputStream(),
                Employee.class, params);
        //引入正确的list（正常保存）
        result.getList().forEach(e ->{
            // System.out.println(e+","+e.getDepartment());
            //根据部门名称拿到它的部门，再放到对应的员工中
            Department dept = departmentService.findByName(e.getDepartment().getName());
            e.setDepartment(dept);
            //给一个默认密码
            e.setPassword("123");
            employeeService.save(e);
        });
//        //引入错误的list
//        result.getFailList().forEach(e ->{
//            System.out.println("错误的："+e);
//        });
        //如果有错误，就直接导出错误文件到前台
        // Verfiy:检验 Fail：失败
        if(result.isVerfiyFail()){
            //如果验证失败，代码到这里面来
            //失败的文件已经准备好了
            Workbook failWorkbook = result.getFailWorkbook();
            //把这个文件导出
            response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"); //mime类型
            response.setHeader("Content-disposition", "attachment;filename=error.xlsx");
            response.setHeader("Pragma", "No-cache");//设置不要缓存


            OutputStream ouputStream = response.getOutputStream();
            failWorkbook.write(ouputStream);
            ouputStream.flush();
            ouputStream.close();
        }

        return "import";
    }

自定义验证规则

实现IExcelVerifyHandler接口，扫描他并交给spring管理

<context:component-scan base-package="cn.itsource.aisell.common" />
/**
 * 准备一个自定义验证
 */
@Component
public class EmployeeExcelVerifyHandler implements IExcelVerifyHandler<Employee> {

    @Autowired
    private IEmployeeService employeeService;

    @Override
    public ExcelVerifyHandlerResult verifyHandler(Employee employee) {
        ExcelVerifyHandlerResult result = new ExcelVerifyHandlerResult(true);
        //如果存在，返回false
        if(!employeeService.checkUsername(employee.getUsername())){
            //代表用户名重复
            result.setMsg("用户名重复");
            result.setSuccess(false);
        }
        return result;
    }
}
@Autowired
private EmployeeExcelVerifyHandler employeeExcelVerifyHandler;
 
@RequestMapping("/employeeXlsx")
    public String employeeXlsx(MultipartFile empFile, HttpServletResponse response) throws Exception {
        //准备导入的参数
        ImportParams params = new ImportParams();
        params.setTitleRows(1);
        // need:需要  verfiy:核实,验证
        params.setNeedVerfiy(true); //需要验证
        //加入自定义验证
        params.setVerifyHandler(employeeExcelVerifyHandler);
       ....
        return "import";
    }

　　

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