销售宝系统_Day08(导入导出)
- Java操作Excel
- easypoi
- EasyPOI基于SpringMVC导出数据
- EasyPOI基于SpringMVC导入数据
Java操作Excel
jxl：只能对Excel进行操作，属于比较老的框架。
POI：是apache的项目，可对ms的word,Excel,PPT进行操作，包括office2003和2007。对两种版本的处理都比较好。具体操作请看官方的文档。
- 导包
org.apache.poi
poi
3.11
org.apache.poi
poi-ooxml
3.11
- 创建Excel(完成99乘法表)
//用原生的poi创建一个99乘法表
@Test
public void test() throws IOException {
//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("九九乘法表");
//3.创建行
for (int i = 1; i <=9 ; i++) {
Row row = sheet.createRow(i - 1);
//4.创建列
for (int j = 1; j <= i ; j++) {
Cell cell = row.createCell(j - 1);
//5.格子中加载数据
cell.setCellValue(j+"*"+i+"="+(i*j));
}
}
//输出的标准格式
FileOutputStream outputStream = new FileOutputStream("99.xlsx");
wb.write(outputStream);
outputStream.close();
}
最后会在项目的根目录下生成一个这样的Excel
3. 读取Excel
//读取xlsx表格中的数据
@Test
public void test02() throws IOException, InvalidFormatException {
// 1.获取到相应的Excel文件(封装成对象，放到内存中)
Workbook wb = WorkbookFactory.create(new FileInputStream("emp-poi.xlsx"));
//2.拿到第一个sheet表
Sheet sheet = wb.getSheetAt(0);
//3.拿到wb中的行(不要头部行)
int rowNum = sheet.getLastRowNum();//总行数
for (int i = 1; i <=rowNum ; i++) {
Row row = sheet.getRow(i);
short cellNum = row.getLastCellNum();//每行总列数
for (int j = 0; j EasyPOI的使用
文档:http://easypoi.mydoc.io/
- 导包
注意:使用EasyPOI需要把之前的poi导包去掉(存在冲突)
cn.afterturn
easypoi-base
3.2.0
cn.afterturn
easypoi-web
3.2.0
cn.afterturn
easypoi-annotation
3.2.0
- PoiEmployee(模拟数据库对应的一个实体类)
package com.xpc.poi.easyPoi;
import cn.afterturn.easypoi.excel.annotation.Excel;
import cn.afterturn.easypoi.excel.annotation.ExcelEntity;
import cn.afterturn.easypoi.excel.annotation.ExcelTarget;
import java.util.Date;
//模拟与数据库对应的domain实体类(员工)
@ExcelTarget("emp")
public class PoiEmployee {
@Excel(name = "名字")
private String username;
@Excel(name = "密码")
private String password;
@Excel(name="年纪")
private Integer age;
//replace:值的替换，导出是男，导入是true
@Excel(name="性别",replace = {"男_true","女_false"})
private Boolean sex = true;
//width:设置列宽(默认为10)
@Excel(name = "邮箱",width = 20)
private String email;
//type:导出类型(2为图片) savePath文件导出保存路径 height：列高
@Excel(name = "头像",type = 2,savePath = "images/head",height = 23)
private String headImage;
@Excel(name = "入职时间",format = "yyyy-MM-dd HH-mm-ss")
private Date date = new Date();
@ExcelEntity
private PoiDepartment department;
get/set方法省略
}
- PoiDepartment(模拟数据库对应的一个实体类)
package com.xpc.poi.easyPoi;
import cn.afterturn.easypoi.excel.annotation.Excel;
import cn.afterturn.easypoi.excel.annotation.ExcelTarget;
//模拟与数据库对应的domain实体类(部门)
@ExcelTarget("dept")
public class PoiDepartment {
//emp这个实体导出的时候表中列叫部门名称 dept这个实体导出的时候叫名称
@Excel(name = "部门名称_emp,名称_dept")
private String name;
//这个字段只有dept这个实体才能导出
@Excel(name = "部门地址_dept")
private String address;
get/set方法省略
}
- EasyPOI创建excel文件
/*
* ExportParams:当前导出的excel的属性
* title:一级标题
* secondTitle:二级标题
* sheetName:表名称
* PoiEmployee.class：导出的数据类型
* list:导出的值
*/
Workbook workbook = ExcelExportUtil.exportExcel(new ExportParams(),
PoiEmployee .class, list);
//输出的标准格式
FileOutputStream outputStream = new FileOutputStream("PoiEmployee.xlsx");
workbook.write(outputStream);
outputStream.close();
- EasyPOI读取excel文件
ImportParams params = new ImportParams();
//params.setTitleRows(1);
//params.setHeadRows(1);
List list = ExcelImportUtil.importExcel(
new File("poiemp.xlsx"),
PoiEmployee.class, params);
list.forEach(e -> {
System.out.println(e+","+e.getDepartment());
});
EasyPOI基于SpringMVC导出数据
- 扫描view
applicationContext-mvc.xml中配置
- 配置bean视图解析器
在applicationContext-mvc.xml的视图解析器后面配置
- 前台传入相应的查询数据
在employee.jsp的查询条的最后加个button，form标签中加个action属性
<%--查询条--%>
- 后台接收参数进行导出
EmployeeController类中加一个方法
@RequestMapping("/download")
//baseQuery：前台传过来的查询条件
public String download(ModelMap map,EmployeeQuery baseQuery,HttpServletRequest request){
//根据条件查询，拿到想要的数据
List list = employeeService.findByQuery(baseQuery);
//得到当前头像所在的绝对路径
String realPath = request.getServletContext().getRealPath("");
//把头像的路径改为觉得路径
list.forEach(e->{
e.setHeadImage(realPath+e.getHeadImage());
});
ExportParams params = new ExportParams("员工表", "mployee", ExcelType.XSSF);
//params.setFreezeCol(2);冻结的2列
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,"mployee");//文件名称
return NormalExcelConstants.EASYPOI_EXCEL_VIEW;//View名称
}
- 给Employee中的字段加上注解
@Excel(name = "用户名")
private String username;
private String password;
@Excel(name = "邮件",width = 20)
private String email;
@Excel(name = "年龄")
private Integer age;
//头像
@Excel(name = "头像",type = 2,width = 10 , height = 20)
private String headImage;
//部门
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name="department_id")
@ExcelEntity
private Department department;
- Department类中的name字段加上注解
@Excel(name = "部门名称")
private String name;
EasyPOI基于SpringMVC导入数据
- 访问页面准备
在webapp/views目录下创建import.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
文件上传
<%@ include file="/WEB-INF/views/head.jsp"%>
在web.controller下面创建一个ImportController类
package com.xpc.web.controller;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
@RequestMapping("/import")
public class ImportController {
@RequestMapping("/index")
public String index(){
return "import";
}
}
- 完善Department的repository和service层
repository
//根据名称拿到部门对象
Department findByName(String name);
service.impl
@Autowired
private DepartmentRepository departmentRepository;
@Override
public Department findByName(String name) {
return departmentRepository.findByName(name);
}
- 导入实现(无验证)
在ImportController类中添加一个方法
@RequestMapping("/empXlsx")
public String empXlsx(MultipartFile empFile,HttpServletResponse response) throws Exception {
//准备一些导入的参数
ImportParams params = new ImportParams();
//params.setTitleRows(1);
//params.setHeadRows(1);
//把上传的excel文件中的数据变成Employee
/*List list = ExcelImportUtil.importExcel(
empFile.getInputStream(),
Employee.class, params);*/
ExcelImportResult result = ExcelImportUtil.importExcelMore(empFile.getInputStream(), Employee.class, params);
List list = result.getList();//获取到成功的数据
//把员工进行保存
list.forEach(e -> {
//设置一个默认密码
e.setPassword("123456");
//根据名称到数据库中拿到部门
Department department = e.getDepartment();
if(department!=null){
Department dbDept = departmentService.findByName(department.getName());
e.setDepartment(dbDept);
}
employeeService.save(e);
});
}
return "import";
}
- 导入验证
导包
org.hibernate
hibernate-validator
5.2.4.Final
- 加上验证的注解
...
@Excel(name = "用户名")
@NotNull(message = "用户名不能为空")
private String username;
@Excel(name = "年龄")
@Max(value=80,message = "年龄不能超过80岁")
@Min(value = 20,message = "年龄不能小于20岁")
private Integer age;
...
- 加上自定义注解(自定义名字不能重复)
在applicationContext.xml中加上这句，开启common包的扫描
然后在common包下面建个EmployeeExcelVerifyHandler类去实现IExcelVerifyHandler(这里泛型要确定)这个接口
package com.xpc.common;
import cn.afterturn.easypoi.excel.entity.result.ExcelVerifyHandlerResult;
import cn.afterturn.easypoi.handler.inter.IExcelVerifyHandler;
import com.xpc.domain.Employee;
import com.xpc.service.IEmployeeService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
@Component
public class EmployeeExcelVerifyHandler implements IExcelVerifyHandler {
@Autowired
private IEmployeeService employeeService;
@Override
public ExcelVerifyHandlerResult verifyHandler(Employee employee) {
ExcelVerifyHandlerResult result = new ExcelVerifyHandlerResult(true);
//拿到相应的用户名
String username = employee.getUsername();
if(!employeeService.checkUsername(username)){
result.setSuccess(false);
result.setMsg("用户名重复了");
}
return result;
}
}
-
导入功能修改(导入失败的就会新建一个Excel文件，可以去查看然后修改)
要验证，必需设置： params.setNeedVerfiy(true);
自定义验证:params.setVerifyHandler(employeeExcelVerifyHandler);
result.getList()； 拿到所有通过验证的数据
result.getFailList()；拿到所有错误的数据
result.getFailWorkbook();拿到错误的文本
@RequestMapping("/empXlsx")
public String empXlsx(MultipartFile empFile,HttpServletResponse response) throws Exception {
//准备一些导入的参数
ImportParams params = new ImportParams();
//params.setTitleRows(1);
//params.setHeadRows(1);
params.setNeedVerfiy(true); //需要验证
//设置验证处理器
params.setVerifyHandler(employeeExcelVerifyHandler);
//把上传的excel文件中的数据变成Employee
/*List list = ExcelImportUtil.importExcel(
empFile.getInputStream(),
Employee.class, params);*/
ExcelImportResult result = ExcelImportUtil.importExcelMore(empFile.getInputStream(),
Employee.class, params);
List list = result.getList();//获取到成功的数据
//把员工进行保存
list.forEach(e -> {
//设置一个默认密码
e.setPassword("123456");
//根据名称到数据库中拿到部门
Department department = e.getDepartment();
if(department!=null){
Department dbDept = departmentService.findByName(department.getName());
e.setDepartment(dbDept);
}
employeeService.save(e);
});
//有错误的情况进行导出
if(result.isVerfiyFail()){
//拿到错误的文件
Workbook failWorkbook = result.getFailWorkbook();
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";
}
上传失败会生成的Excel文件类容如下图所试
