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| package albert.practice.poi;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import lombok.extern.slf4j.Slf4j;
//http://www.codejava.net/coding/how-to-write-excel-files-in-java-using-apache-poi
//http://viralpatel.net/blogs/java-read-write-excel-file-apache-poi/
@Slf4j
public class PoiExample {
private static String excelFile = "D:" + File.separator + "issue.xls";
public static void main(String[] args) throws IOException {
PoiExample test = new PoiExample();
test.writeExcel();
test.readExcel(excelFile);
}
public List<Issue> readExcel(String excelFile) throws IOException {
List<Issue> issues = new ArrayList<Issue>();
InputStream inputStream = null;
Workbook workbook = null;
try {
// 1. Create a Workbook.
inputStream = new FileInputStream(new File(excelFile));
workbook = new HSSFWorkbook(inputStream);
// 2. Get first sheet
Sheet sheet = workbook.getSheetAt(0);
// 3. Iterate through each rows from first sheet
Iterator<Row> rowIterator = sheet.iterator();
int rowCount = 1;
while (rowIterator.hasNext()) {
// (1) ignore header row
if (rowCount == 1) {
rowIterator.next();
rowCount++;
}
// (2) start to read each row from second row
else {
Row row = rowIterator.next();
Integer id = Double.valueOf(row.getCell(0).getNumericCellValue()).intValue();
String subject = row.getCell(1).getStringCellValue();
String status = row.getCell(2).getStringCellValue();
String priority = row.getCell(3).getStringCellValue();
Issue issue = new Issue();
issue.setId(id);
issue.setSubject(subject);
issue.setStatus(status);
issue.setPriority(priority);
issues.add(issue);
}
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} finally {
if (inputStream != null) {
inputStream.close();
}
if (workbook != null) {
workbook.close();
}
}
for (Issue issue : issues) {
log.debug("issue = " + issue.toString());
}
return issues;
}
public void writeExcel() throws IOException {
// 0. prepare dummy data
List<Issue> issues = createDummyIssues();
// 1. Create a Workbook.
Workbook workbook = new HSSFWorkbook();
// 2. Create a Sheet.
Sheet sheet = workbook.createSheet("issue list");
// 3. create cell style
CellStyle style = createCellStyle(workbook);
// 4. Repeat the following steps until all data is processed:
// (1) Create a Row.
// (2) Create Cells in a Row. Apply formatting using CellStyle.
int rowCount = 0;
Row headerRow = sheet.createRow(rowCount);
writeHeader(headerRow, style);
for (Issue issue : issues) {
Row row = sheet.createRow(++rowCount);
writeDataForEachRow(issue, row, style);
}
// 5. auto resize column width
for (int i = 0; i < 4; i++) {
sheet.autoSizeColumn(i);
}
// 6. Write to an OutputStream.
// 7. Close the output stream.
FileOutputStream outputStream = null;
try {
outputStream = new FileOutputStream(excelFile);
workbook.write(outputStream);
log.debug("write issue data to excel file successfully");
} catch (FileNotFoundException e) {
e.printStackTrace();
} finally {
if (outputStream != null) {
outputStream.close();
}
if (workbook != null) {
workbook.close();
}
}
}
private void writeHeader(Row headerRow, CellStyle style) {
Cell cell = headerRow.createCell(0);
cell.setCellValue("編號");
cell.setCellStyle(style);
cell = headerRow.createCell(1);
cell.setCellValue("主旨");
cell.setCellStyle(style);
cell = headerRow.createCell(2);
cell.setCellValue("狀態");
cell.setCellStyle(style);
cell = headerRow.createCell(3);
cell.setCellValue("優先");
cell.setCellStyle(style);
}
private void writeDataForEachRow(Issue issue, Row row, CellStyle style) {
Cell cell = row.createCell(0);
cell.setCellValue(issue.getId());
cell.setCellStyle(style);
cell = row.createCell(1);
cell.setCellValue(issue.getSubject());
cell.setCellStyle(style);
cell = row.createCell(2);
cell.setCellValue(issue.getStatus());
cell.setCellStyle(style);
cell = row.createCell(3);
cell.setCellValue(issue.getPriority());
cell.setCellStyle(style);
}
private CellStyle createCellStyle(Workbook workbook) {
CellStyle cellStyle = workbook.createCellStyle();
cellStyle.setBorderBottom((short) 1);
cellStyle.setBorderTop((short) 1);
cellStyle.setBorderLeft((short) 1);
cellStyle.setBorderRight((short) 1);
cellStyle.setWrapText(true);
return cellStyle;
}
private List<Issue> createDummyIssues() {
Issue issue1 = new Issue(1, "查不到資料", "新建立", "正常");
Issue issue2 = new Issue(2, "新增時發生錯誤", "新建立", "高");
Issue issue3 = new Issue(3, "刪除失敗", "處理中", "高");
return Arrays.asList(issue1, issue2, issue3);
}
}
|
