Excel匯入匯出-(poi)簡單封裝兩個類,拿來就可以用
阿新 • • 發佈：2019-01-03
前言
我們在做專案中，肯定有Excel匯入匯出這個需求，但看網上poi相關文件亂七八糟，還不如干脆實際一點，直接來個稍微簡單點的demo，暫時把業務相關的東西拋開，於是我直接封裝了兩個ExcelExport,ExcelImport類，通過執行main方法，我們就能快速體驗匯入匯出的效果。然後我們用springboot搭建了web專案，體驗一下web匯入excel和匯出excel。
先看一下效果
匯入測試：
web頁面(vue實現的)：
POI常用類說明
| 類名 | 作用 |
|---|---|
| HSSFWorkbook | Excel的文件物件 |
| HSSFSheet | sheet |
| HSSFRow | Excel的行 |
| HSSFCell | Excel的格子單元 |
| HSSFFont | Excel字型 |
| HSSFCellStyle | 格子單元樣式 |
開始封裝ExportExcel類
<!-- POI -->
<poi-version>3.15</poi-version>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>${poi-version}</ 我們先把思路理清楚：
private SXSSFWorkbook wb; //工作薄物件
private Sheet sheet; //工作表物件
private Map<String, //CellStyle> styles; // 樣式列表
private int rownum; //當前行號
建立標題-> 建立表格head-> 建立單元格，並把值設定進去（excel也是有規律的，遍歷他就好）
package com.example.poi;
import com.example.vo.UserVo;
import com.google.common.collect.Lists;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.xssf.streaming.SXSSFWorkbook;
import org.apache.poi.xssf.usermodel.XSSFClientAnchor;
import org.apache.poi.xssf.usermodel.XSSFRichTextString;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.servlet.http.HttpServletResponse;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* 匯出Excel檔案（匯出“XLSX”格式，支援大資料量匯出）
* @author lanxinghua
* @version 2018-10-03
*/
public class ExportExcel {
private static Logger log = LoggerFactory.getLogger(ExportExcel.class);
/**
* 工作薄物件
*/
private SXSSFWorkbook wb;
/**
* 工作表物件
*/
private Sheet sheet;
/**
* 樣式列表
*/
private Map<String, CellStyle> styles;
/**
* 當前行號
*/
private int rownum;
/**
* 建構函式
* @param title 表格標題，傳“空值”，表示無標題
* @param headerList 表頭列表
*/
public ExportExcel(String title, List<String> headerList) {
initialize(title, headerList);
}
/**
* 初始化函式
* @param title 表格標題，傳“空值”，表示無標題
* @param headerList 表頭列表
*/
private void initialize(String title, List<String> headerList) {
this.wb = new SXSSFWorkbook(500);
this.sheet = wb.createSheet("Export");
this.styles = createStyles(wb);
// Create title
if (StringUtils.isNotBlank(title)){
Row titleRow = sheet.createRow(rownum++);
titleRow.setHeightInPoints(30);
Cell titleCell = titleRow.createCell(0);
titleCell.setCellStyle(styles.get("title"));
titleCell.setCellValue(title);
sheet.addMergedRegion(new CellRangeAddress(titleRow.getRowNum(),
titleRow.getRowNum(), titleRow.getRowNum(), headerList.size()-1));
}
// Create header
if (headerList == null){
throw new RuntimeException("headerList not null!");
}
Row headerRow = sheet.createRow(rownum++);
headerRow.setHeightInPoints(16);
for (int i = 0; i < headerList.size(); i++) {
Cell cell = headerRow.createCell(i);
cell.setCellStyle(styles.get("header"));
String[] ss = StringUtils.split(headerList.get(i), "**", 2);
if (ss.length==2){
cell.setCellValue(ss[0]);
Comment comment = this.sheet.createDrawingPatriarch().createCellComment(
new XSSFClientAnchor(0, 0, 0, 0, (short) 3, 3, (short) 5, 6));
comment.setString(new XSSFRichTextString(ss[1]));
cell.setCellComment(comment);
}else{
cell.setCellValue(headerList.get(i));
}
}
for (int i = 0; i < headerList.size(); i++) {
int colWidth = sheet.getColumnWidth(i)*2;
sheet.setColumnWidth(i, colWidth < 3000 ? 3000 : colWidth);
}
//sheet.setColumnWidth(3,10000);
log.debug("Initialize success.");
}
/**
* 建立表格樣式
* @param wb 工作薄物件
* @return 樣式列表
*/
private Map<String, CellStyle> createStyles(Workbook wb) {
Map<String, CellStyle> styles = new HashMap<String, CellStyle>();
CellStyle style = wb.createCellStyle();
style.setAlignment(CellStyle.ALIGN_CENTER);
style.setVerticalAlignment(CellStyle.VERTICAL_CENTER);
Font titleFont = wb.createFont();
titleFont.setFontName("Arial");
titleFont.setFontHeightInPoints((short) 16);
titleFont.setBoldweight(Font.BOLDWEIGHT_BOLD);
style.setFont(titleFont);
styles.put("title", style);
style = wb.createCellStyle();
style.setVerticalAlignment(CellStyle.VERTICAL_CENTER);
style.setBorderRight(CellStyle.BORDER_THIN);
style.setRightBorderColor(IndexedColors.GREY_50_PERCENT.getIndex());
style.setBorderLeft(CellStyle.BORDER_THIN);
style.setLeftBorderColor(IndexedColors.GREY_50_PERCENT.getIndex());
style.setBorderTop(CellStyle.BORDER_THIN);
style.setTopBorderColor(IndexedColors.GREY_50_PERCENT.getIndex());
style.setBorderBottom(CellStyle.BORDER_THIN);
style.setBottomBorderColor(IndexedColors.GREY_50_PERCENT.getIndex());
Font dataFont = wb.createFont();
dataFont.setFontName("Arial");
dataFont.setFontHeightInPoints((short) 10);
style.setFont(dataFont);
styles.put("data", style);
style = wb.createCellStyle();
style.cloneStyleFrom(styles.get("data"));
style.setAlignment(CellStyle.ALIGN_LEFT);
styles.put("data1", style);
style = wb.createCellStyle();
style.cloneStyleFrom(styles.get("data"));
style.setAlignment(CellStyle.ALIGN_CENTER);
styles.put("data2", style);
style = wb.createCellStyle();
style.cloneStyleFrom(styles.get("data"));
style.setAlignment(CellStyle.ALIGN_RIGHT);
styles.put("data3", style);
style = wb.createCellStyle();
style.cloneStyleFrom(styles.get("data"));
// style.setWrapText(true);
style.setAlignment(CellStyle.ALIGN_CENTER);
style.setFillForegroundColor(IndexedColors.GREY_50_PERCENT.getIndex());
style.setFillPattern(CellStyle.SOLID_FOREGROUND);
Font headerFont = wb.createFont();
headerFont.setFontName("Arial");
headerFont.setFontHeightInPoints((short) 10);
headerFont.setBoldweight(Font.BOLDWEIGHT_BOLD);
headerFont.setColor(IndexedColors.WHITE.getIndex());
style.setFont(headerFont);
styles.put("header", style);
return styles;
}
/**
* 新增一行
* @return 行物件
*/
public Row addRow(){
return sheet.createRow(rownum++);
}
/**
* 新增一個單元格
* @param row 新增的行
* @param column 新增列號
* @param val 新增值
* @return 單元格物件
*/
public Cell addCell(Row row, int column, Object val){
return this.addCell(row, column, val, 0);
}
/**
* 新增一個單元格
* @param row 新增的行
* @param column 新增列號
* @param val 新增值
* @param align 對齊方式（1：靠左；2：居中；3：靠右）
* @return 單元格物件
*/
public Cell addCell(Row row, int column, Object val, int align){
Cell cell = row.createCell(column);
String cellFormatString = "@";
try {
if(val == null){
cell.setCellValue("");
}{
if(val instanceof String) {
cell.setCellValue((String) val);
}else if(val instanceof Integer) {
cell.setCellValue((Integer) val);
cellFormatString = "0";
}else if(val instanceof Long) {
cell.setCellValue((Long) val);
cellFormatString = "0";
}else if(val instanceof Double) {
cell.setCellValue((Double) val);
cellFormatString = "0.00";
}else if(val instanceof Float) {
cell.setCellValue((Float) val);
cellFormatString = "0.00";
}else if(val instanceof Date) {
cell.setCellValue((Date) val);
cellFormatString = "yyyy-MM-dd HH:mm";
}
}
if (val != null){
CellStyle style = styles.get("data_column_"+column);
if (style == null){
style = wb.createCellStyle();
style.cloneStyleFrom(styles.get("data"+(align>=1&&align<=3?align:2)));
style.setDataFormat(wb.createDataFormat().getFormat(cellFormatString));
styles.put("data_column_" + column, style);
}
cell.setCellStyle(style);
}
} catch (Exception ex) {
log.info("Set cell value ["+row.getRowNum()+","+column+"] error: " + ex.toString());
cell.setCellValue(val.toString());
}
return cell;
}
/**
* 新增資料
*
* @param dataList
* @return
*/
public ExportExcel setDataList(List<UserVo> dataList){
for (int i = 0; i < dataList.size(); i++) {
Row row = this.addRow();
UserVo user = dataList.get(i);
this.addCell(row, 0, user.getId());
this.addCell(row, 1, user.getUserName());
this.addCell(row, 2, user.getAge());
}
return this;
}
/**
* 輸出資料流
* @param os 輸出資料流
*/
public ExportExcel write(OutputStream os) throws IOException{
wb.write(os);
return this;
}
/**
* 輸出到客戶端
* @param fileName 輸出檔名
*/
public ExportExcel write(HttpServletResponse response, String fileName) throws IOException{
response.reset();
response.setContentType("application/octet-stream; charset=utf-8");
response.setHeader("Content-Disposition", "attachment; filename="+fileName);
write(response.getOutputStream());
return this;
}
/**
* 輸出到檔案
*/
public ExportExcel writeFile(String name) throws Exception{
FileOutputStream os = new FileOutputStream(name);
this.write(os);
return this;
}
/**
* 清理臨時檔案
*/
public ExportExcel dispose(){
wb.dispose();
return this;
}
/**
* 匯出測試
*/
public static void main(String[] args) throws Exception {
List<String> headerList = Lists.newArrayList();
headerList.add("編號");
headerList.add("姓名");
headerList.add("年齡");
List<UserVo> dataList = Lists