excel processing using jexcel and poi (#1058)

* excel processing using jexcel and poi * update examples * small fix * fix poi version, fix imports
2017-02-03 04:46:39 +02:00
parent a1312e9ce0
commit a44ea9588f
6 changed files with 419 additions and 0 deletions
--- a/spring-mvc-java/src/main/java/com/baeldung/excel/ExcelPOIHelper.java
+++ b/spring-mvc-java/src/main/java/com/baeldung/excel/ExcelPOIHelper.java
@@ -0,0 +1,140 @@
+package com.baeldung.excel;
+
+import org.apache.poi.ss.usermodel.Cell;
+import org.apache.poi.ss.usermodel.CellType;
+import org.apache.poi.ss.usermodel.CellStyle;
+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.Workbook;
+import org.apache.poi.xssf.usermodel.XSSFWorkbook;
+import org.apache.poi.xssf.usermodel.XSSFFont;
+import org.apache.poi.ss.usermodel.DateUtil;
+import org.apache.poi.ss.usermodel.FillPatternType;
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.Map;
+import java.util.HashMap;
+import java.util.ArrayList;
+import org.springframework.stereotype.Service;
+
+@Service
+public class ExcelPOIHelper {
+
+    public Map<Integer, ArrayList<String>> readExcel(String fileLocation) throws IOException {
+
+        Map<Integer, ArrayList<String>> data = new HashMap<Integer, ArrayList<String>>();
+        FileInputStream file = new FileInputStream(new File(fileLocation));
+        Workbook workbook = new XSSFWorkbook(file);
+        Sheet sheet = workbook.getSheetAt(0);
+        int i = 0;
+        for (Row row : sheet) {
+            data.put(i, new ArrayList<String>());
+            for (Cell cell : row) {
+                switch (cell.getCellTypeEnum()) {
+                case STRING:
+                    data.get(i)
+                        .add(cell.getRichStringCellValue()
+                            .getString());
+                    break;
+                case NUMERIC:
+                    if (DateUtil.isCellDateFormatted(cell)) {
+                        data.get(i)
+                            .add(cell.getDateCellValue() + "");
+                    } else {
+                        data.get(i)
+                            .add(cell.getNumericCellValue() + "");
+                    }
+                    break;
+                case BOOLEAN:
+                    data.get(i)
+                        .add(cell.getBooleanCellValue() + "");
+                    break;
+                case FORMULA:
+                    data.get(i)
+                        .add(cell.getCellFormula() + "");
+                    break;
+                default:
+                    data.get(i)
+                        .add(" ");
+                }
+            }
+            i++;
+        }
+        if (workbook != null){
+            workbook.close();
+        }
+        return data;
+    }
+
+    public void writeExcel() throws IOException {
+        Workbook workbook = new XSSFWorkbook();
+
+        try {
+            Sheet sheet = workbook.createSheet("Persons");
+            sheet.setColumnWidth(0, 6000);
+            sheet.setColumnWidth(1, 4000);
+
+            Row header = sheet.createRow(0);
+
+            CellStyle headerStyle = workbook.createCellStyle();
+
+            headerStyle.setFillForegroundColor(IndexedColors.LIGHT_BLUE.getIndex());
+            headerStyle.setFillPattern(FillPatternType.SOLID_FOREGROUND);
+
+            XSSFFont font = ((XSSFWorkbook) workbook).createFont();
+            font.setFontName("Arial");
+            font.setFontHeightInPoints((short) 16);
+            font.setBold(true);
+            headerStyle.setFont(font);
+
+            Cell headerCell = header.createCell(0);
+            headerCell.setCellValue("Name");
+            headerCell.setCellStyle(headerStyle);
+
+            headerCell = header.createCell(1);
+            headerCell.setCellValue("Age");
+            headerCell.setCellStyle(headerStyle);
+
+            CellStyle style = workbook.createCellStyle();
+            style.setWrapText(true);
+
+            Row row = sheet.createRow(2);
+            Cell cell = row.createCell(0);
+            cell.setCellValue("John Smith");
+            cell.setCellStyle(style);
+
+            cell = row.createCell(1);
+            cell.setCellValue(20);
+            cell.setCellStyle(style);
+
+            row = sheet.createRow(3);
+            cell = row.createCell(0);
+            cell.setCellValue("Ana Johnson");
+            cell.setCellStyle(style);
+
+            cell = row.createCell(1);
+            cell.setCellValue(30);
+            cell.setCellStyle(style);
+
+            File currDir = new File(".");
+            String path = currDir.getAbsolutePath();
+            String fileLocation = path.substring(0, path.length() - 1) + "temp.xlsx";
+
+            FileOutputStream outputStream = new FileOutputStream(fileLocation);
+            workbook.write(outputStream);
+        } finally {
+            if (workbook != null) {
+                try {
+                    workbook.close();
+                } catch (IOException e) {
+                    e.printStackTrace();
+                }
+            }
+        }
+    }
+
+}