工作中經常要用到excel的導出,所以參考其他人的demo寫了一個導出excel的基礎代碼。如果以後再需要用的時候,直接拿來修改下就能直接使用。
參考博文地址:https://blog.csdn.net/phil_jing/article/details/78307819
以下是maven依賴
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>3.17</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>3.17</version>
</dependency>
工具包
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.9</version>
</dependency>
以下是導出代碼實現
package com.example.demo.utils;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.apache.commons.lang3.time.FastDateFormat;
import java.util.Collection;
import java.util.Date;
import java.util.Iterator;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.FillPatternType;
import org.apache.poi.ss.usermodel.Font;
import org.apache.poi.ss.usermodel.HorizontalAlignment;
import org.apache.poi.ss.usermodel.IndexedColors;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.VerticalAlignment;
import org.apache.poi.ss.usermodel.Workbook;
public class ExportExcel {
/**
* excel導出
* @param sheetName sheet名稱
* @param title 標題
* @param headers 表頭
* @param columns 字段名稱
* @param dataset 數據集合
* @param pattern 日期格式
* @return Workbook
*/
public static Workbook exportExcel(String sheetName, String title, String[] headers, String[] columns,
Collection<Map<String, Object>> dataset, String pattern){
// 創建excel工作簿
Workbook workbook = new XSSFWorkbook();
// 創建第一個sheet(頁),並命名
Sheet sheet = workbook.createSheet(sheetName);
// -----------------表格標題行樣式-----------------
CellStyle titleStyle = workbook.createCellStyle();
// 設置這些樣式
titleStyle.setFillForegroundColor(IndexedColors.GREY_25_PERCENT.getIndex()); // 填充顏色
titleStyle.setFillPattern(FillPatternType.SOLID_FOREGROUND); // 填充樣式
titleStyle.setAlignment(HorizontalAlignment.CENTER); // 水平居中
titleStyle.setVerticalAlignment(VerticalAlignment.CENTER); //垂直居中
titleStyle.setBorderBottom(BorderStyle.THIN);
titleStyle.setBorderLeft(BorderStyle.THIN);
titleStyle.setBorderRight(BorderStyle.THIN);
titleStyle.setBorderTop(BorderStyle.THIN);
// 生成一個字體
Font font = workbook.createFont();
font.setColor(IndexedColors.WHITE.getIndex());
font.setFontHeightInPoints((short) 12);
font.setBold(true);
// font.setBoldweight((short)700));
// 把字體應用到當前的樣式
titleStyle.setFont(font);
// ----------------樣式2 內容的背景----------------
CellStyle style2 = workbook.createCellStyle();
style2.setFillForegroundColor(IndexedColors.WHITE.getIndex());
style2.setFillPattern(FillPatternType.SOLID_FOREGROUND);
style2.setBorderBottom(BorderStyle.THIN);
style2.setBorderLeft(BorderStyle.THIN);
style2.setBorderRight(BorderStyle.THIN);
style2.setBorderTop(BorderStyle.THIN);
style2.setAlignment(HorizontalAlignment.CENTER);
style2.setVerticalAlignment(VerticalAlignment.CENTER);
// 生成另一個字體
Font font2 = workbook.createFont();
font.setBold(true);
// font2.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);
// 把字體應用到當前的樣式
style2.setFont(font2);
int rowCount = 0; // 起始行號
Row row;
// ------------設置首行標題標題--------------
if (StringUtils.isNotEmpty(title)){
// 如果有標題
row = sheet.createRow(rowCount);
Cell cell = row.createCell(rowCount);
cell.setCellValue(title);
cell.setCellStyle(titleStyle);
//合併單元格
CellRangeAddress region = new CellRangeAddress(rowCount, rowCount, 0, headers.length-1);
sheet.addMergedRegion(region);
rowCount++;
}
// ----------------表頭------------------
row = sheet.createRow(rowCount);
//
for (int i = 0; i < headers.length; i++) {
Cell cell = row.createCell(i);
cell.setCellStyle(titleStyle);
// 富文本字符串:用於同一單元格內容展示不用樣式
// RichTextString text = new XSSFRichTextString(headers[i]);
cell.setCellValue(headers[i]);
}
rowCount++;
// --------------單元格數據----------------
if(StringUtils.isEmpty(pattern)) {
pattern = "yyyy/MM/dd";
}
FastDateFormat instance = FastDateFormat.getInstance(pattern);
// 遍歷集合數據,產生數據行
Iterator<Map<String, Object>> it = dataset.iterator(); // 多個Map集合
int count = 0;
while (it.hasNext()) {
row = sheet.createRow(rowCount);
Map<String, Object> map = it.next();
count = headers.length < columns.length ? headers.length : columns.length;
for (int i = 0; i < count; i++) {
Cell cell = row.createCell(i);
cell.setCellStyle(style2);
try {
Object value = map.get(columns[i]);
// 判斷值的類型後進行強制類型轉換
String textValue = null;
if (value instanceof Date) {
Date date = (Date) value;
textValue = instance.format(date);
}else {
// 其它數據類型都當作字符串簡單處理
if (value != null) {
textValue = value.toString();
} else {
textValue = "";
}
}
// 利用正則表達式判斷textValue是否全部由數字組成
if (textValue != null) {
Pattern p = Pattern.compile("^//d+(//.//d+)?$");
Matcher matcher = p.matcher(textValue);
if (matcher.matches()) {
// 是數字當作double處理
cell.setCellValue(Double.parseDouble(textValue));
} else {
cell.setCellValue(textValue);
cell.setCellStyle(style2);
}
}
} catch (SecurityException e) {
e.printStackTrace();
}
}
rowCount++;
}
return workbook;
}
}
控制層調用
package com.example.demo.controller;
import com.example.demo.model.Bean;
import com.example.demo.utils.ExportExcel;
import org.apache.poi.ss.usermodel.Workbook;
import org.springframework.util.StringUtils;
import org.springframework.web.bind.annotation.*;
import javax.servlet.http.HttpServletResponse;
import java.time.LocalTime;
import java.util.*;
@RestController
public class TestController {
private static String EXPORT_XLSX_FILE_SUFFIX = ".xlsx";
private static String EXPORT_XLS_FILE_SUFFIX = ".xls";
/**
* 導出
*/
@RequestMapping(value = "/export")
public void getExcel1(@RequestParam Map<String, Object> map, HttpServletResponse response) throws Exception {
LocalTime localTime1 = LocalTime.now();
System.out.println("開始時間:" + localTime1);
//查詢條件
System.out.println((String) map.get("name"));
//
List<Bean> beanList = new ArrayList<>();
for (int i = 0; i<10000; i++){
Bean bean1 = new Bean();
bean1.setAttribute("屬性" + i);
bean1.setName("字段" + i);
bean1.setLength(i);
bean1.setType("類型" + i);
bean1.setNote("註釋" + i);
beanList.add(bean1);
}
List<Map<String,Object>> list = new ArrayList<>();
for (Bean bean : beanList) {
Map<String,Object> hashMap = new HashMap<>();
//
hashMap.put("attribute",bean.getAttribute());
hashMap.put("name",bean.getName());
hashMap.put("length",bean.getLength());
hashMap.put("type",bean.getType());
hashMap.put("note",bean.getNote());
//
list.add(hashMap);
}
String sheetName = "sheet1";
String title1 = "標題"; // 標題
String[] title2 = {"屬性", "字段", "長度","類型","註釋"}; // 表頭
String[] columns = {"attribute", "name", "length","type","note"}; // 字段
String pattern = "yyyy/MM/dd"; // 日期格式
//
String excelType;
if(StringUtils.isEmpty(map.get("excel_type"))) {
excelType = EXPORT_XLSX_FILE_SUFFIX;
} else {
excelType = (String) map.get("excel_type");
}
Workbook workbook = ExportExcel.exportExcel(sheetName,title1,title2,columns,list,pattern);
response.setHeader("Content-type", "application/vnd.ms-excel");
response.setCharacterEncoding("UTF-8");
response.setHeader("Content-Disposition", "attachment;filename=" + System.currentTimeMillis() + excelType);
workbook.write(response.getOutputStream());
workbook.close();
//
LocalTime localTime2 = LocalTime.now();
System.out.println("結束時間:" + localTime2);
}
}
項目啓動後,在瀏覽器地址欄輸入:localhost:8080/export?excel_type=.xls&name=小明
導出1w條數據所用時間大概爲3-4秒