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("zhang@qq.com");
Employee e2 = new Employee();
e2.setId(2L);
e2.setUsername("李四");
e2.setEmail("li@qq.com");
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("zhang@qq.com");
e1.setDepartment(department1);
e1.setHeadImage("images/user.png");
Employee e2 = new Employee();
e2.setId(2L);
e2.setUsername("李四");
e2.setEmail("li@qq.com");
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";
}