java對excel寫入與讀取
阿新 • • 發佈：2018-11-27
maven:
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>3.16</version>
</dependency>
java程式碼:
import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.io.OutputStream; import java.net.URLEncoder; import java.util.ArrayList; import java.util.List; import java.util.Map; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import org.apache.commons.codec.binary.Base64; import org.apache.commons.lang.StringUtils; import org.apache.poi.hssf.usermodel.HSSFCell; import org.apache.poi.hssf.usermodel.HSSFCellStyle; import org.apache.poi.hssf.usermodel.HSSFDataFormat; import org.apache.poi.hssf.usermodel.HSSFFont; import org.apache.poi.hssf.usermodel.HSSFRow; import org.apache.poi.hssf.usermodel.HSSFSheet; import org.apache.poi.hssf.usermodel.HSSFWorkbook; import org.apache.poi.ss.usermodel.BorderStyle; import org.apache.poi.ss.usermodel.HorizontalAlignment; /** * excel匯出工具類 */ public class ExcelUtils { // excel預設寬度； private static int width = 256 * 14; // 預設字型 private static String excelfont = "微軟雅黑"; private static HSSFWorkbook wb; private static HSSFWorkbook workbookRead; /** * @param excelName 匯出的EXCEL名字 * @param headers 匯出的表格的表頭 * @param ds_titles 匯出的資料 map.get(key) 對應的 key * @param data 資料集 List<Map> */ public static void export(String excelName, String[] headers, String[] ds_titles, List<Map<String, Object>> data, HttpServletRequest request, HttpServletResponse response) throws IOException { export(excelName, "sheet1", headers, ds_titles, data, request, response); } /** * @param excelName 匯出的EXCEL名字 * @param sheetName 匯出的SHEET名字 當前sheet數目只為1 * @param headers 匯出的表格的表頭 * @param ds_titles 匯出的資料 map.get(key) 對應的 key * @param data 資料集 List<Map> */ public static void export(String excelName, String sheetName, String[] headers, String[] ds_titles, List<Map<String, Object>> data, HttpServletRequest request, HttpServletResponse response) throws IOException { int[] ds_format = new int[ds_titles.length]; int[] widths = new int[ds_titles.length]; for(int i=0;i<ds_titles.length;i++){ ds_format[i] = 1; widths[i] = width; } export(excelName, sheetName, headers, ds_titles, ds_format, widths, data, request, response); } /** * @param excelName 匯出的EXCEL名字 * @param sheetName 匯出的SHEET名字 當前sheet數目只為1 * @param headers 匯出的表格的表頭 * @param ds_titles 匯出的資料 map.get(key) 對應的 key * @param ds_format 匯出資料的樣式 * 1:String left; 2:String center 3:String right 4 int right 5:float ###,###.## right 6:number: #.00% 百分比 right * @param widths 表格的列寬度 預設為 256*14 * @param data 資料集 List<Map> */ public static void export(String excelName, String sheetName, String[] headers, String[] ds_titles, int[] ds_format, int[] widths, List<Map<String, Object>> data, HttpServletRequest request, HttpServletResponse response) throws IOException { HttpSession session = request.getSession(); session.setAttribute("state", null); if (widths == null) { widths = new int[ds_titles.length]; for (int i = 0; i < ds_titles.length; i++) { widths[i] = width; } } if (ds_format == null) { ds_format = new int[ds_titles.length]; for (int i = 0; i < ds_titles.length; i++) { ds_format[i] = 1; } } // 設定檔名 String fileName = ""; if (StringUtils.isNotEmpty(excelName)) { fileName = excelName; } wb = new HSSFWorkbook(); // 建立一個sheet HSSFSheet sheet = wb.createSheet(StringUtils.isNotEmpty(sheetName) ? sheetName : "excel"); // 建立表頭，如果沒有跳過 int headerrow = 0; if (headers != null) { HSSFRow row = sheet.createRow(headerrow); // 表頭樣式 HSSFCellStyle style = wb.createCellStyle(); HSSFFont font = wb.createFont(); font.setBold(true); font.setFontName(excelfont); font.setFontHeightInPoints((short) 11); style.setFont(font); style.setAlignment(HorizontalAlignment.CENTER); style.setBorderBottom(BorderStyle.THIN); style.setBorderLeft(BorderStyle.THIN); style.setBorderRight(BorderStyle.THIN); style.setBorderTop(BorderStyle.THIN); for (int i = 0; i < headers.length; i++) { sheet.setColumnWidth((short) i, (short) widths[i]); HSSFCell cell = row.createCell(i); cell.setCellValue(headers[i]); cell.setCellStyle(style); } headerrow++; } // 表格主體 解析list if (data != null) { List<HSSFCellStyle> styleList = new ArrayList<HSSFCellStyle>(); for (int i = 0; i < ds_titles.length; i++) { // 列數 HSSFCellStyle style = wb.createCellStyle(); HSSFFont font = wb.createFont(); font.setFontName(excelfont); font.setFontHeightInPoints((short) 10); style.setFont(font); style.setBorderBottom(BorderStyle.THIN); style.setBorderLeft(BorderStyle.THIN); style.setBorderRight(BorderStyle.THIN); style.setBorderTop(BorderStyle.THIN); if (ds_format[i] == 1) { style.setAlignment(HorizontalAlignment.LEFT); } else if (ds_format[i] == 2) { style.setAlignment(HorizontalAlignment.CENTER); } else if (ds_format[i] == 3) { style.setAlignment(HorizontalAlignment.RIGHT); // 整型 } else if (ds_format[i] == 4) { style.setAlignment(HorizontalAlignment.RIGHT); // 整型 style.setDataFormat(HSSFDataFormat.getBuiltinFormat("0")); } else if (ds_format[i] == 5) { // float型別 style.setAlignment(HorizontalAlignment.RIGHT); style.setDataFormat(HSSFDataFormat.getBuiltinFormat("#,##0.00")); } else if (ds_format[i] == 6) { // 百分比型別 style.setAlignment(HorizontalAlignment.RIGHT); style.setDataFormat(HSSFDataFormat.getBuiltinFormat("0.00%")); } styleList.add(style); } for (int i = 0; i < data.size(); i++) { // 行數 HSSFRow row = sheet.createRow(headerrow); @SuppressWarnings("rawtypes") Map map = data.get(i); for (int j = 0; j < ds_titles.length; j++) { // 列數 HSSFCell cell = row.createCell(j); Object o = map.get(ds_titles[j]); if (o == null || "".equals(o)) { cell.setCellValue(""); } else if (ds_format[j] == 4) { cell.setCellValue((Long.valueOf((map.get(ds_titles[j])) + "")).longValue()); } else if (ds_format[j] == 5 || ds_format[j] == 6) { cell.setCellValue((Double.valueOf((map.get(ds_titles[j])) + "")).doubleValue()); } else { cell.setCellValue(map.get(ds_titles[j]) + ""); } cell.setCellStyle((HSSFCellStyle) styleList.get(j)); } headerrow++; } } fileName = fileName + ".xls"; String filename = ""; try { filename = encodeChineseDownloadFileName(request, fileName); } catch (Exception e) { e.printStackTrace(); } response.setHeader("Content-disposition", filename); response.setContentType("application/vnd.ms-excel"); response.setHeader("Content-disposition", "attachment;filename=" + filename); response.setHeader("Pragma", "No-cache"); OutputStream ouputStream = response.getOutputStream(); wb.write(ouputStream); ouputStream.flush(); ouputStream.close(); session.setAttribute("state", "open"); } /** * 對檔案流輸出下載的中文檔名進行編碼 遮蔽各種瀏覽器版本的差異性 */ public static String encodeChineseDownloadFileName(HttpServletRequest request, String pFileName) throws Exception { String filename = null; String agent = request.getHeader("USER-AGENT"); if (null != agent) { if (-1 != agent.indexOf("Firefox")) { filename = "=?UTF-8?B?" + (new String(Base64.encodeBase64(pFileName.getBytes("UTF-8")))) + "?="; } else if (-1 != agent.indexOf("Chrome")) { filename = new String(pFileName.getBytes(), "ISO8859-1"); } else { filename = URLEncoder.encode(pFileName, "UTF-8"); filename = filename.replace("+", "%20"); } } else { filename = pFileName; } return filename; } public static void main(String args[]){ try { List<String> rs = getSheetData("D:\\工號比對結果.csv"); for(int i=0;i<rs.size();i++){ System.err.println(rs.get(i)); } } catch (IOException e) { e.printStackTrace(); } } /** * 讀取excel表格資料 * @param filePath 檔案路徑 */ public static List<String> getSheetData(String filePath) throws IOException { return getSheetData(filePath,2); } /** * 讀取excel表格資料 * @param filePath 檔案路徑 * @param msgLine 從第幾行開始讀取 */ public static List<String> getSheetData(String filePath,int msgLine) throws IOException { return getSheetData(filePath, "", msgLine); } /** * 讀取excel表格資料 * @param filePath 檔案路徑 * @param sheetName sheet名稱:為空為讀取所有 * @param msgLine 從第幾行開始讀取 */ public static List<String> getSheetData(String filePath,String sheetName,int msgLine) throws IOException { if(msgLine==0){ msgLine = 1; } List<String> rs = new ArrayList<String>(); workbookRead = new HSSFWorkbook(new FileInputStream(new File(filePath))); HSSFSheet sheet = null; String excelStName = ""; int cols = 0; StringBuffer stringBuffer = new StringBuffer(); for (int i = 0; i < workbookRead.getNumberOfSheets(); i++) { // 獲取每個Sheet表 sheet = workbookRead.getSheetAt(i); excelStName = sheet.getSheetName(); if (!"".equals(sheetName) && !sheetName.equals(excelStName)) { continue; } for (int j = 0; j < sheet.getPhysicalNumberOfRows(); j++) { // 獲取每行 HSSFRow row = sheet.getRow(j); if(j==0){ cols = row.getPhysicalNumberOfCells(); // 以第一行為準獲取總列數 } if(j+1 < msgLine){ continue; } stringBuffer = new StringBuffer(); for (int k = 0; k < cols; k++) { // 獲取每個單元格 stringBuffer.append(StringUtil.strFormatNull(row.getCell(k))).append("|"); } stringBuffer.append(excelStName); rs.add(stringBuffer.toString()); } } return rs; } }