報表輸出是Java應用開發中經常涉及的內容,而一般的報表往往缺乏通用性,不方便用戶進行個性化編輯。 Java程序由於其跨平台特性,不能直接操縱Excel。因此,本文探討一下POI視線Java程序進行Excel的讀取和導入。
項目結構:
java_poi_excel
用到的Excel文件:
xls
XlsMain .java 類
//該類有main方法,主要負責運行程序,同時該類中也包含了用poi讀取Excel(2003版) import java.io.FileInputStream;import java.io.IOException;import java.io.InputStream;import java.util.ArrayList;import java.util.List; import org.apache.poi.hssf.usermodel.HSSFCell;import org.apache.poi.hssf.usermodel.HSSFRow;import org.apache.poi.hssf.usermodel.HSSFSheet;import org.apache.poi.hssf.usermodel.HSSFWorkbook; /** * * @author Hongten</br> * * */public class XlsMain { public static void main(String[] args) throws IOException { XlsMain xlsMain = new XlsMain(); XlsDto xls = null; List<XlsDto> list = xlsMain.readXls(); try { XlsDto2Excel.xlsDto2Excel(list); } catch (Exception e) { e.printStackTrace(); } for (int i = 0; i < list.size(); i++) { xls = (XlsDto) list.get(i); System.out.println(xls.getXh() + " " + xls.getXm() + " " + xls.getYxsmc() + " " + xls.getKcm() + " " + xls.getCj()); } } /** * 讀取xls文件內容* * @return List<XlsDto>對象* @throws IOException * 輸入/輸出(i/o)異常*/ private List<XlsDto> readXls() throws IOException { InputStream is = new FileInputStream("pldrxkxxmb.xls"); HSSFWorkbook hssfWorkbook = new HSSFWorkbook(is); XlsDto xlsDto = null; List<XlsDto> list = new ArrayList<XlsDto>(); // 循環工作表Sheet for (int numSheet = 0; numSheet < hssfWorkbook.getNumberOfSheets(); numSheet++) { HSSFSheet hssfSheet = hssfWorkbook.getSheetAt(numSheet); if (hssfSheet == null) { continue; } // 循環行Row for (int rowNum = 1; rowNum <= hssfSheet.getLastRowNum(); rowNum++) { HSSFRow hssfRow = hssfSheet.getRow(rowNum); if (hssfRow == null) { continue; } xlsDto = new XlsDto(); // 循環列Cell // 0學號1姓名2學院3課程名4 成績// for (int cellNum = 0; cellNum <=4; cellNum++) { HSSFCell xh = hssfRow.getCell(0); if (xh == null) { continue; } xlsDto.setXh(getValue(xh)); HSSFCell xm = hssfRow.getCell(1); if (xm == null) { continue; } xlsDto.setXm(getValue(xm)); HSSFCell yxsmc = hssfRow.getCell(2); if (yxsmc == null) { continue; } xlsDto.setYxsmc(getValue(yxsmc)); HSSFCell kcm = hssfRow.getCell(3); if (kcm == null) { continue; } xlsDto.setKcm(getValue(kcm)); HSSFCell cj = hssfRow.getCell(4); if (cj == null) { continue; } xlsDto.setCj(Float.parseFloat(getValue(cj))); list.add(xlsDto); } } return list; } /** * 得到Excel表中的值* * @param hssfCell * Excel中的每一個格子* @return Excel中每一個格子中的值*/ @SuppressWarnings("static-access") private String getValue(HSSFCell hssfCell) { if (hssfCell.getCellType() == hssfCell.CELL_TYPE_BOOLEAN) { // 返回布爾類型的值return String.valueOf(hssfCell.getBooleanCellValue()); } else if (hssfCell.getCellType() == hssfCell.CELL_TYPE_NUMERIC) { // 返回數值類型的值return String.valueOf(hssfCell.getNumericCellValue()); } else { // 返回字符串類型的值return String.valueOf(hssfCell.getStringCellValue()); } } }XlsDto2Excel.java類
//該類主要負責向Excel(2003版)中插入數據import java.io.FileOutputStream;import java.io.OutputStream;import java.util.List; import org.apache.poi.hssf.usermodel.HSSFCell;import org.apache.poi.hssf.usermodel.HSSFRichTextString;import org.apache.poi.hssf.usermodel.HSSFRow;import org.apache.poi.hssf.usermodel.HSSFSheet;import org.apache.poi.hssf.usermodel.HSSFWorkbook; public class XlsDto2Excel { /** * * @param xls * XlsDto實體類的一個對象* @throws Exception * 在導入Excel的過程中拋出異常*/ public static void xlsDto2Excel(List<XlsDto> xls) throws Exception { // 獲取總列數int CountColumnNum = xls.size(); // 創建Excel文檔HSSFWorkbook hwb = new HSSFWorkbook(); XlsDto xlsDto = null; // sheet 對應一個工作頁HSSFSheet sheet = hwb.createSheet("pldrxkxxmb"); HSSFRow firstrow = sheet.createRow(0); // 下標為0的行開始HSSFCell[] firstcell = new HSSFCell[CountColumnNum]; String[] names = new String[CountColumnNum]; names[0] = "學號"; names[1] = "姓名"; names[2] = "學院"; names[3] = "課程名"; names[4] = "成績"; for (int j = 0; j < CountColumnNum; j++) { firstcell[j] = firstrow.createCell(j); firstcell[j].setCellValue(new HSSFRichTextString(names[j])); } for (int i = 0; i < xls.size(); i++) { // 創建一行HSSFRow row = sheet.createRow(i + 1); // 得到要插入的每一條記錄xlsDto = xls.get(i); for (int colu = 0; colu <= 4; colu++) { // 在一行內循環HSSFCell xh = row.createCell(0); xh.setCellValue(xlsDto.getXh()); HSSFCell xm = row.createCell(1); xm.setCellValue(xlsDto.getXm()); HSSFCell yxsmc = row.createCell(2); yxsmc.setCellValue(xlsDto.getYxsmc()); HSSFCell kcm = row.createCell(3); kcm.setCellValue(xlsDto.getKcm()); HSSFCell cj = row.createCell(4); cj.setCellValue(xlsDto.getCj());(xlsDto.getMessage()); } } // 創建文件輸出流,準備輸出電子表格OutputStream out = new FileOutputStream("POI2Excel/pldrxkxxmb.xls"); hwb.write(out); out.close(); System.out.println("數據庫導出成功"); } }XlsDto .java類
//該類是一個實體類public class XlsDto { /** * 選課號*/ private Integer xkh; /** * 學號*/ private String xh; /** * 姓名*/ private String xm; /** * 學院*/ private String yxsmc; /** * 課程號*/ private Integer kch; /** * 課程名*/ private String kcm; /** * 成績*/ private float cj; public Integer getXkh() { return xkh; } public void setXkh(Integer xkh) { this.xkh = xkh; } public String getXh() { return xh; } public void setXh(String xh) { this.xh = xh; } public String getXm() { return xm; } public void setXm(String xm) { this.xm = xm; } public String getYxsmc() { return yxsmc; } public void setYxsmc(String yxsmc) { this.yxsmc = yxsmc; } public Integer getKch() { return kch; } public void setKch(Integer kch) { this.kch = kch; } public String getKcm() { return kcm; } public void setKcm(String kcm) { this.kcm = kcm; } public float getCj() { return cj; } public void setCj(float cj) { this.cj = cj; } }後台輸出:
數據庫導出成功
1.0 hongten 信息技術學院計算機網絡應用基礎80.0
2.0 王五信息技術學院計算機網絡應用基礎81.0
3.0 李勝基信息技術學院計算機網絡應用基礎82.0
4.0 五班古信息技術學院計算機網絡應用基礎83.0
5.0 蔡詩芸信息技術學院計算機網絡應用基礎84.0
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