Java+element实现excel的导入和导出
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本项目是前端vue3，后端springboot开发 需求为：前端导入表格，后端处理表格存储数据，点击按钮可以导出表格。
上传效果：前端点击上传按钮，会跳出选择文件框，选择文件，点击上传。
导出效果：前端点击导出按钮，会跳出下载框，选择位置自动下载。
上传效果图：
下载效果图：
一、上传excel前端代码
<el-upload
ref="file"
class="upload-demo"
:limit="1"
accept=".xlsx, .xls"
action="http://localhost:8081/admin/perform/importexcel"
auto-upload="false"
>
<template #trigger>
<el-button type="primary">选择文件</el-button>
</template>
<el-button
class="ml-3"
style="margin-left: 20px"
type="success"
@click="submitUpload"
>
上传文件
</el-button>
仅允许导入xls、xlsx格式文件。
</el-upload>import { ref, reactive, computed } from "vue"
import { ElMessage, UploadInstance } from "element-plus"
const file = ref<UploadInstance>()
const submitUpload = () => {
file.value!.submit()
ElMessage({
message: "上传成功",
type: "success",
})
window.location.reload()
}
效果图
二、上传excel后端代码
Controller层
@PostMapping("/importexcel")
public Result importData(MultipartFile file) throws Exception {
return performService.importData(file.getInputStream());
}
Service层
@Override
public Result importData(InputStream inputStream) throws IOException {
// Perform根据自己表格的表头创建的实体，要意义对应
List<Perform> res = new ArrayList<>();
try {
ins = (FileInputStream) inputStream;
//true xls文件，false xlsx文件
Workbook workbook = null;
// XSSFWorkbook instance of HSSFWorkbook 所以通用
workbook = new XSSFWorkbook(ins);
//获取工作表
Sheet sheet = workbook.getSheetAt(0);
//获取表头
Row rowHead = sheet.getRow(0);
//判断表头是否正确
if (rowHead.getPhysicalNumberOfCells() < 1) {
return Result.error("表头错误");
}
//获取数据
for (int i = 1; i <= sheet.getLastRowNum(); i++) {
//获取第一行的用户信息
Row row = sheet.getRow(i);
String tId;
if (row.getCell(0) == null) {
tId = "";
row.createCell(0).setCellValue(tId);
} else {
//先设置为字符串再作为数字读出来
row.getCell(0).setCellType(CellType.STRING);
tId = row.getCell(0).getStringCellValue();
}
String tName;
if (row.getCell(1) == null) {
tName = "";
row.createCell(1).setCellValue(tName);
} else {
tName = row.getCell(1).getStringCellValue();
}
String tDept;
if (row.getCell(2) == null) {
tDept = "";
row.createCell(2).setCellValue(tDept);
} else {
tDept = row.getCell(2).getStringCellValue();
}
....................
Perorm perform=new Perform()
xxxset创建实体
System.out.println(perform);
res.add(perform);
}
} catch (IOException e) {
e.printStackTrace();
} finally {
if (ins != null) {
try {
ins.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (out != null) {
try {
out.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
new Thread(() -> {
//批处理比较快
batchInsert(res);
}).start();
return Result.success(res);
}
private void batchInsert(List<Perform> performList) {
SqlSession sqlSession = sqlSessionFactory.openSession(ExecutorType.BATCH, false);
performList.stream().forEach(perform -> {
performMapper.insert(perform);
});
sqlSession.commit();
sqlSession.clearCache();
}
三、下载excel前端代码
<el-button
type="warning"
style="width: 100px"
@click="exportInfo()"
>
<a href="http://localhost:8081/admin/perform/exportexcel" rel="external nofollow"
>导出</a
>
</el-button>
const exportInfo = () => {
ElMessage({
message: "请稍等",
type: "warning",
})
}
四、下载excel后端代码
Controller层
@GetMapping("/exportexcel")
public void exportExcel(HttpServletResponse response) throws Exception {
performService.exportExcel(response);
}
Service层
@Override
public void exportExcel(HttpServletResponse response) throws IOException {
System.out.println("导出表格");
List<Perform> list = performMapper.selectList(new QueryWrapper<>());
String sheetName = "教师业绩表";
Map<String, String> titleMap = new LinkedHashMap<>();
titleMap.put("tId", "教师工号");
titleMap.put("tName", "教师姓名");
.....根据自己的表头来
ExportExcel.excelExport(response, list, titleMap, sheetName);
}
ExportExcel类：
package com.performance.back.common.utils;
import com.baomidou.mybatisplus.core.toolkit.ObjectUtils;
import com.performance.back.admin.dao.entity.Perform;
import org.apache.poi.hssf.usermodel.*;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.CellRangeAddress;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.reflect.Method;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import java.util.Map;
public class ExportExcel {
private ExportExcel() {
}
private static HSSFWorkbook workbook;
private static HSSFSheet sheet;
private static final int TITLE_START_POSITION = 0;
private static final int DATEHEAD_START_POSITION = 1;
private static final int HEAD_START_POSITION = 0;
private static final int CONTENT_START_POSITION = 1;
private static void initHSSFWorkbook(String sheetName) {
workbook = new HSSFWorkbook();
sheet = workbook.createSheet(sheetName);
sheet.setDefaultColumnWidth(15);
}
private static void createTitleRow(Map<String, String> titleMap, String sheetName) {
CellRangeAddress titleRange = new CellRangeAddress(0, 0, 0, titleMap.size() - 1);
sheet.addMergedRegion(titleRange);
HSSFRow titleRow = sheet.createRow(TITLE_START_POSITION);
HSSFCell titleCell = titleRow.createCell(0);
titleCell.setCellValue(sheetName);
}
private static void createDateHeadRow(Map<String, String> titleMap) {
CellRangeAddress dateRange = new CellRangeAddress(1, 1, 0, titleMap.size() - 1);
sheet.addMergedRegion(dateRange);
HSSFRow dateRow = sheet.createRow(DATEHEAD_START_POSITION);
HSSFCell dateCell = dateRow.createCell(0);
dateCell.setCellValue(new SimpleDateFormat("yyyy年MM月dd日").format(new Date()));
}
private static void createHeadRow(Map<String, String> titleMap) {
// 第1行创建
HSSFRow headRow = sheet.createRow(HEAD_START_POSITION);
headRow.setHeight((short) 900);
int i = 0;
for (String entry : titleMap.keySet()) {
// 生成一个样式
HSSFCellStyle style = workbook.createCellStyle();
// 设置这些样式
style.setAlignment(HorizontalAlignment.CENTER);//水平居中
style.setVerticalAlignment(VerticalAlignment.CENTER);//垂直居中
// 设置边框
style.setBorderBottom(BorderStyle.THIN);
style.setBorderLeft(BorderStyle.THIN);
style.setBorderRight(BorderStyle.THIN);
style.setBorderTop(BorderStyle.THIN);
// 自动换行
style.setWrapText(true);
// 生成一个字体
HSSFFont font = workbook.createFont();
font.setFontHeightInPoints((short) 10);
font.setColor(IndexedColors.WHITE.index);
font.setBold(false);
font.setFontName("宋体");
// 把字体 应用到当前样式
style.setFont(font);
//style设置好后，为cell设置样式
HSSFCell headCell = headRow.createCell(i);
headCell.setCellValue(titleMap.get(entry));
if (i > 14) {
// 背景色
style.setFillForegroundColor(IndexedColors.BLUE.index);
style.setFillPattern(FillPatternType.SOLID_FOREGROUND);
style.setFillBackgroundColor(IndexedColors.BLUE.index);
} else if (i > 10) {
style.setFillForegroundColor(IndexedColors.BLACK.index);
style.setFillPattern(FillPatternType.SOLID_FOREGROUND);
style.setFillBackgroundColor(IndexedColors.BLACK.index);
} else if (i > 7) {
style.setFillForegroundColor(IndexedColors.BLUE.index);
style.setFillPattern(FillPatternType.SOLID_FOREGROUND);
style.setFillBackgroundColor(IndexedColors.BLUE.index);
} else if (i >4) {
style.setFillForegroundColor(IndexedColors.RED.index);
style.setFillPattern(FillPatternType.SOLID_FOREGROUND);
style.setFillBackgroundColor(IndexedColors.RED.index);
} else {
style.setFillForegroundColor(IndexedColors.GREEN.index);
style.setFillPattern(FillPatternType.SOLID_FOREGROUND);
style.setFillBackgroundColor(IndexedColors.GREEN.index);
}
headCell.setCellStyle(style);
i++;
}
}
private static void createContentRow(List<?> dataList, Map<String, String> titleMap) {
try {
int i = 0;
// 生成一个样式
HSSFCellStyle style = workbook.createCellStyle();
// 设置这些样式
style.setAlignment(HorizontalAlignment.CENTER);//水平居中
style.setVerticalAlignment(VerticalAlignment.CENTER);//垂直居中
// 设置边框
style.setBorderBottom(BorderStyle.THIN);
style.setBorderLeft(BorderStyle.THIN);
style.setBorderRight(BorderStyle.THIN);
style.setBorderTop(BorderStyle.THIN);
// 自动换行
style.setWrapText(true);
// 生成一个字体
HSSFFont font = workbook.createFont();
font.setFontHeightInPoints((short) 10);
font.setColor(IndexedColors.BLACK.index);
font.setBold(false);
font.setFontName("宋体");
// 把字体 应用到当前样式
style.setFont(font);
//style设置好后，为cell设置样式
for (Object obj : dataList) {
HSSFRow textRow = sheet.createRow(CONTENT_START_POSITION + i);
int j = 0;
for (String entry : titleMap.keySet()) {
//属性名驼峰式
String method = "get" + entry.substring(0, 1).toUpperCase() + entry.substring(1);
// System.out.println("调用" + method + "方法");
//反射调用
Method m = obj.getClass().getMethod(method, null);
Object value = m.invoke(obj, null);
HSSFCell textcell = textRow.createCell(j);
if (ObjectUtils.isNotEmpty(value)) {
textcell.setCellValue(value.toString());
} else {
textcell.setCellValue("");
}
textcell.setCellStyle(style);
j++;
}
i++;
}
} catch (Exception e) {
e.printStackTrace();
}
}
private static void autoSizeColumn(Integer size) {
for (int j = 0; j < size; j++) {
sheet.autoSizeColumn(j);
}
}
public static void excelExport( HttpServletResponse response, List<Perform> list, Map<String, String> titleMap, String sheetName) throws IOException {
//生成表格的不可重复名
Date date = new Date();
// 初始化workbook
initHSSFWorkbook(sheetName);
// 表头行
createHeadRow(titleMap);
// 文本行
createContentRow(list, titleMap);
//输出Excel文件
OutputStream output=response.getOutputStream();
response.reset();
//设置响应头，
response.setHeader("Content-disposition", "attachment; filename=teacher.xls");
response.setContentType("application/msexcel");
workbook.write(output);
output.close();
}
}到此这篇关于Java+element实现excel的导入和导出的文章就介绍到这了,更多相关Java element excel导入和导出内容请搜索编程网以前的文章或继续浏览下面的相关文章希望大家以后多多支持编程网！
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