簡單springboot+maven+poi匯出
阿新 • • 發佈：2019-01-28
1. 在pom.xml中新增一下依賴：
<dependency> <groupId>org.apache.poi</groupId> <artifactId>poi</artifactId> <version>3.13</version> </dependency> <dependency> <groupId>org.apache.poi</groupId> <artifactId>poi-ooxml</artifactId> <version>3.15</version> </dependency>
2. 公共方法，功能如下：
2.1 相容65535行單sheet頁資料限制
2.2 相容數字型別
2.3 匯出資料帶格式屬性（邊框，自動調整列寬，字型，帶序號）
2.4 自定義匯出，提供beanToMap方法，傳入匯出所需欄位名稱，對應欄位屬性，反射呼叫對應get方法獲取屬性值
2.5 相容火狐瀏覽器/IE瀏覽器
BeanToMap.java
import com.alibaba.dubbo.common.utils.Log; import java.lang.reflect.Field; import java.lang.reflect.Method; import java.util.HashMap; import java.util.Map; public class BeanToMap<T> { public String getMethodName(String fieldName){ byte[] buffer = fieldName.getBytes(); buffer[0] = (byte)(buffer[0]-32); String name = new String(buffer); return "get"+name; } public Map<String,Object> getMap(T entity){ Field[] fields = entity.getClass().getDeclaredFields(); Map<String,Object> map = new HashMap<>(); for (int j = 0; j < fields.length; j++) { try { Method method = entity.getClass().getMethod(getMethodName(fields[j].getName())); map.put(fields[j].getName(),method.invoke(entity)); } catch (Exception e) { e.printStackTrace(); } } return map; } }
PoiExcelExport.java
import org.apache.poi.hssf.usermodel.*; import org.apache.poi.hssf.util.HSSFColor; import org.apache.poi.ss.usermodel.Cell; import org.apache.poi.ss.usermodel.CellStyle; import java.io.IOException; import java.io.OutputStream; import java.util.List; import java.util.Map; public class PoiExcelExport<T> { // excle匯出名稱 private String fileName; // excel 表頭 private String[] heads; // excel 列 private String[] cols; // 設定數值型的列 從0開始計數 private int[] numerics; //list集合 private List<T> list; // 輸出流 private OutputStream out; // 建構函式 public PoiExcelExport(String fileName, String[] heads, String[] cols, List<T> list, OutputStream out) { this.fileName = fileName; this.heads = heads; this.cols = cols; this.list = list; this.out = out; } // 建構函式 帶數字型別 public PoiExcelExport(String fileName, String[] heads, String[] cols, List<T> list, int[] numerics, OutputStream out) { this.fileName = fileName; this.heads = heads; this.cols = cols; this.list = list; this.numerics = numerics; this.out = out; } public void exportExcel() { HSSFWorkbook hssfworkbook = new HSSFWorkbook(); // 建立一個excel物件 //sheet樣式定義【getColumnTopStyle()/getStyle()均為自定義方法 - 在下面 - 可擴充套件】 HSSFCellStyle columnTopStyle = this.getColumnTopStyle(hssfworkbook);//獲取列頭樣式物件 HSSFCellStyle style = this.getStyle(hssfworkbook); //單元格樣式物件 for (int i = 0; i <= (list.size() / 65535); i++) { HSSFSheet hssfsheet = hssfworkbook.createSheet(); // 工作表 // 工作表名稱 hssfworkbook.setSheetName(i, fileName.replace(".xls", "") + "(第" + (i + 1) + "頁)"); int beginRows = 65535 * i; int endRows = (list.size() > 65535 * (i + 1)) ? 65535 * (i + 1) - 1 : list.size() - 1; HSSFRow hssfrowHead = hssfsheet.createRow(0); // 輸出excel 表頭 if (heads != null && heads.length > 0) { for (int h = 0; h < heads.length; h++) { HSSFCell hssfcell = hssfrowHead.createCell(h, Cell.CELL_TYPE_STRING); hssfcell.setCellValue(heads[h]); hssfcell.setCellStyle(columnTopStyle); } } // 要設定數值型 列表 // 是否是數值型 boolean isnum = false; // 輸出excel 資料 for (int curRow = beginRows; curRow <= endRows; curRow++) { // 獲取資料 BeanToMap<T> btm = new BeanToMap<T>(); Map<String,Object> hm = btm.getMap(list.get(curRow)); // 建立excel行 表頭1行 導致資料行數 延後一行 HSSFRow hssfrow = hssfsheet.createRow(curRow % 65535 + 1); // 讀取資料值 for (int k = 0; k < cols.length; k++) { HSSFCell hssfcell = hssfrow.createCell(k); // hssfcell.setCellValue(hm.get(cols[k])==null?"":hm.get(cols[k]).toString()); isnum = false; for (int z = 0; z < numerics.length; z++) { if (numerics[z] == k) { isnum = true; break; } } if (isnum) { if(k==0){ hssfcell.setCellValue(curRow+1); } else { if (hm.get(cols[k]) != null || !hm.get(cols[k]).equals("")) { hssfcell.setCellValue(Double.parseDouble( hm.get(cols[k]) == null ? "" : hm.get(cols[k]).toString().replace(",", ""))); } } } else { hssfcell.setCellValue(hm.get(cols[k]) == null ? "" : hm.get(cols[k]).toString()); } hssfcell.setCellStyle(style); } } //讓列寬隨著匯出的列長自動適應 for (int colNum = 0; colNum < heads.length; colNum++) { int columnWidth = hssfsheet.getColumnWidth(colNum) / 256; for (int rowNum = 0; rowNum < hssfsheet.getLastRowNum(); rowNum++) { HSSFRow currentRow; //當前行未被使用過 if (hssfsheet.getRow(rowNum) == null) { currentRow = hssfsheet.createRow(rowNum); } else { currentRow = hssfsheet.getRow(rowNum); } if (currentRow.getCell(colNum) != null) { HSSFCell currentCell = currentRow.getCell(colNum); if (currentCell.getCellType() == HSSFCell.CELL_TYPE_STRING) { int length = currentCell.getStringCellValue().getBytes().length; if (columnWidth < length) { columnWidth = length; } } } } if(colNum == 0){ hssfsheet.setColumnWidth(colNum, (columnWidth-2) * 256); }else{ hssfsheet.setColumnWidth(colNum, (columnWidth+4) * 256); } } } // excel生成完畢，寫到輸出流 try { hssfworkbook.write(out); out.flush(); out.close(); } catch (IOException e) { e.printStackTrace(); } } /* * 列頭單元格樣式 */ public HSSFCellStyle getColumnTopStyle(HSSFWorkbook workbook) { // 設定字型 HSSFFont font = workbook.createFont(); //設定字型大小 font.setFontHeightInPoints((short)11); //字型加粗 font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD); //設定字型名字 font.setFontName("Courier New"); //設定樣式; HSSFCellStyle style = workbook.createCellStyle(); //設定底邊框; style.setBorderBottom(HSSFCellStyle.BORDER_THIN); //設定底邊框顏色; style.setBottomBorderColor(HSSFColor.BLACK.index); //設定左邊框; style.setBorderLeft(HSSFCellStyle.BORDER_THIN); //設定左邊框顏色; style.setLeftBorderColor(HSSFColor.BLACK.index); //設定右邊框; style.setBorderRight(HSSFCellStyle.BORDER_THIN); //設定右邊框顏色; style.setRightBorderColor(HSSFColor.BLACK.index); //設定頂邊框; style.setBorderTop(HSSFCellStyle.BORDER_THIN); //設定頂邊框顏色; style.setTopBorderColor(HSSFColor.BLACK.index); //在樣式用應用設定的字型; style.setFont(font); //設定自動換行; style.setWrapText(false); //設定水平對齊的樣式為居中對齊; style.setAlignment(HSSFCellStyle.ALIGN_CENTER); //設定垂直對齊的樣式為居中對齊; style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER); return style; } /* * 列資料資訊單元格樣式 */ public HSSFCellStyle getStyle(HSSFWorkbook workbook) { // 設定字型 HSSFFont font = workbook.createFont(); //設定字型大小 //font.setFontHeightInPoints((short)10); //字型加粗 //font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD); //設定字型名字 font.setFontName("Courier New"); //設定樣式; HSSFCellStyle style = workbook.createCellStyle(); //設定底邊框; style.setBorderBottom(HSSFCellStyle.BORDER_THIN); //設定底邊框顏色; style.setBottomBorderColor(HSSFColor.BLACK.index); //設定左邊框; style.setBorderLeft(HSSFCellStyle.BORDER_THIN); //設定左邊框顏色; style.setLeftBorderColor(HSSFColor.BLACK.index); //設定右邊框; style.setBorderRight(HSSFCellStyle.BORDER_THIN); //設定右邊框顏色; style.setRightBorderColor(HSSFColor.BLACK.index); //設定頂邊框; style.setBorderTop(HSSFCellStyle.BORDER_THIN); //設定頂邊框顏色; style.setTopBorderColor(HSSFColor.BLACK.index); //在樣式用應用設定的字型; style.setFont(font); //設定自動換行; style.setWrapText(false); //設定水平對齊的樣式為居中對齊; style.setAlignment(HSSFCellStyle.ALIGN_CENTER); //設定垂直對齊的樣式為居中對齊; style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER); //資料格式 style.setDataFormat(HSSFDataFormat.getBuiltinFormat("##0")); return style; } }
ServletUtil.java
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
public class ServletUtil {
private String fileName;
private HttpServletRequest req;
private HttpServletResponse resp;
public OutputStream getOut(){
try {
return resp.getOutputStream();
} catch (IOException e) {
e.printStackTrace();
return null;
}
}
public ServletUtil(HttpServletResponse resp){
this.resp = resp;
}
public ServletUtil(String fileName,
HttpServletRequest req,
HttpServletResponse resp){
this.fileName = fileName;
this.req = req;
this.resp = resp;
}
public void poiExcelServlet(){
resp.setContentType("application/vnd.ms-excel");
String contentDisposition = "";
try {
if (req.getHeader("User-Agent").toLowerCase().indexOf("firefox") > 0) {
contentDisposition = "attachment; filename=\"" + new String(fileName.getBytes("UTF-8"), "ISO8859-1")
+ "\"";// firefox瀏覽器
} else {
contentDisposition = "attachment; filename=\"" + URLEncoder.encode(fileName, "UTF-8") + "\"";// IE瀏覽器
}
} catch (UnsupportedEncodingException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
resp.setHeader("Content-Disposition", contentDisposition);
resp.setCharacterEncoding("UTF-8");
}
}
Controller層:
/**
* 賬號資料匯出excel
* @param req
* @param resp
*/
@RequestMapping(value = "/export",method = RequestMethod.GET)
public void export(@RequestBody String json,HttpServletRequest req,HttpServletResponse resp){
LOG.info("ENTER /uas/admin/export,paramter is {}",json);
//準備資料
List<Model> list = service.getList(json);
//執行匯出
String fileName = "自定義檔名稱.xls";
ServletUtil su = new ServletUtil(fileName, req, resp);
su.poiExcelServlet();
String[] heads = {"欄位1","欄位2","欄位3","欄位4"};
String[] cols = {"field1","field2","field3","field4"};
//這裡傳第幾個欄位是數字，從0開始
int[] numerics = {0,2};
ServletUtil suresp = new ServletUtil(resp);
PoiExcelExport<Model> pee = new PoiExcelExport<>(fileName, heads, cols, list, numerics, suresp.getOut());
pee.exportExcel();
}文章借鑑 https://www.cnblogs.com/xiaopotian/p/8043147.html，感謝！