JAVA中实现对Excel的导入与导出

1 使用Jxl实现Excel的导入与导出

1 ） 新建实体类Book

package com.bean; public class Book { private Integer id ; private String name ; private String author; public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getAuthor() { return author; } public void setAuthor(String author) { this.author = author; } }

2 ） 实现导入与导出方法

package com.main; import java.io.File; import java.io.IOException; import java.util.ArrayList; import java.util.List; import com.bean.Book; import jxl.Cell; import jxl.Sheet; import jxl.Workbook; import jxl.write.Label; import jxl.write.WritableSheet; import jxl.write.WritableWorkbook; import jxl.write.WriteException; public class ExcleBook { /** * 针对Book类进行导出的操作 * @param list */ public void excleOut(List list) { WritableWorkbook book = null; try { // 创建一个excle对象 book = Workbook.createWorkbook(new File("h:/excleTest/book.xls")); // 通过excle对象创建一个选项卡对象 WritableSheet sheet = book.createSheet("sheet1", 0); // 创建一个单元格对象 列 行 值 // Label label = new Label(0, 2, "test"); for (int i = 0; i < list.size(); i++) { Book book2 = list.get(i); Label label1 = new Label(0, i, String.valueOf(book2.getId())); Label label2 = new Label(1, i, book2.getName()); Label label3 = new Label(2, i, book2.getAuthor()); // 将创建好的单元格对象放入选项卡中 sheet.addCell(label1); sheet.addCell(label2); sheet.addCell(label3); } // 写入目标路径 book.write(); } catch (Exception e) { e.printStackTrace(); } finally { try { book.close(); } catch (WriteException | IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } /** * 针对Book类进行导入的操作 * @return */ public List excleIn() { List list = new ArrayList<>(); Workbook workbook = null; try { // 获取Ecle对象 workbook = Workbook.getWorkbook(new File("h:/excleTest/book.xls")); // 获取选项卡对象 第0个选项卡 Sheet sheet = workbook.getSheet(0); // 循环选项卡中的值 for (int i = 0; i < sheet.getRows(); i++) { Book book = new Book(); // 获取单元格对象 Cell cell0 = sheet.getCell(0, i); // 取得单元格的值,并设置到对象中 book.setId(Integer.valueOf(cell0.getContents())); // 获取单元格对象，然后取得单元格的值,并设置到对象中 book.setName(sheet.getCell(1, i).getContents()); book.setAuthor(sheet.getCell(2, i).getContents()); list.add(book); } } catch (Exception e) { e.printStackTrace(); } finally { workbook.close(); } return list; } public static void main(String[] args) { ExcleBook book = new ExcleBook(); List list = new ArrayList<>(); Book book2 = new Book(); book2.setId(1); book2.setName("书本名1"); book2.setAuthor("张三"); Book book3 = new Book(); book3.setId(2); book3.setName("书本名2"); book3.setAuthor("李四"); list.add(book2); list.add(book3); book.excleOut(list); List books = book.excleIn(); for (Book bo : books) { System.out.println(bo.getId() + " " + bo.getName() + " " + bo.getAuthor()); } } }

在这当中需要加入jxl.jar这个包，自己在网上下载，如果你使用Mavne,进行对应的配置就可以了。

2 使用Poi实现Excel的导入与导出

我们在网上找 POI下载的时候，会发现它有点大，而且还有几个不同的包，那么我们到底需要那个。如果你只需要对xls文件进行解释，只需要加入poi-Version.jar；如果要对xlsx文件进行解释，那么你需要加入poi-ooxml-Version.jar；如果你要对word、ppt、viso、outlook等时需要用到poi-scratchpad-version-yyyymmdd.jar。因为我们这里只是对xls文件解释，所以我们加入的poi-3.17.jar这个文件。

package com.main; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.util.ArrayList; import java.util.List; import org.apache.poi.hssf.usermodel.HSSFRow; import org.apache.poi.hssf.usermodel.HSSFSheet; import org.apache.poi.hssf.usermodel.HSSFWorkbook; import com.bean.Book; public class ExclePoiBook { /** * 针对Book类进行导出的操作 * * @param list */ public void excleOut(List list) { // 创建Excel文档 HSSFWorkbook hwb = new HSSFWorkbook(); // 通过excle对象创建一个选项卡对象 HSSFSheet sheet = hwb.createSheet("sheet1"); Book book = null; // 循环list创建行 for (int i = 0; i < list.size(); i++) { // 新建一行 HSSFRow row = sheet.createRow(i); book = list.get(i); // 设置i+1行第0列的数据 row.createCell(0).setCellValue(book.getId()); // 设置i+1行第1列的数据 row.createCell(1).setCellValue(book.getName()); // 设置i+1行第2列的数据 row.createCell(2).setCellValue(book.getAuthor()); } OutputStream out = null; try { out = new FileOutputStream("h:/excleTest/bookPoi.xls"); hwb.write(out); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } finally { try { out.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } /** * 针对Book类进行导入的操作 * * @return */ public List excleIn() { List list = new ArrayList<>(); Book book = null; try { InputStream is = new FileInputStream("h:/excleTest/bookPoi.xls"); HSSFWorkbook hssfWorkbook = new HSSFWorkbook(is); // 获取选项卡对象 第0个选项卡 , 因为我们这里只有一个选项卡，如果你每个选项卡的内容是一样，可以通过循环取出 HSSFSheet hssfSheet = hssfWorkbook.getSheetAt(0); // 循环取出每行的值 for (int rowNum = 0; rowNum <= hssfSheet.getLastRowNum(); rowNum++) { HSSFRow hssfRow = hssfSheet.getRow(rowNum); book = new Book(); //注意Poi读取的内容是有类型的，处理起来也jxl有所不同 book.setId((int) hssfRow.getCell(0).getNumericCellValue()); book.setName(hssfRow.getCell(1).getStringCellValue()); book.setAuthor(hssfRow.getCell(2).getStringCellValue()); list.add(book); } } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } return list; } public static void main(String[] args) { ExclePoiBook exclePoiBook = new ExclePoiBook(); List list = new ArrayList<>(); Book book2 = new Book(); book2.setId(1); book2.setName("书本名1"); book2.setAuthor("张三"); Book book3 = new Book(); book3.setId(2); book3.setName("书本名2"); book3.setAuthor("李四"); list.add(book2); list.add(book3); exclePoiBook.excleOut(list); List books = exclePoiBook.excleIn(); for (int i = 0; i < books.size(); i++) { System.out.println(books.get(i).getId() + " " + books.get(i).getName() + " " + books.get(i).getAuthor()); } } }

3 Poi与JXl实现Excel的对比 

这个博客写得不错，感兴趣的可以去看看poi与JXI的对比