java中实现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());
         }
     }
 }