转载：http://www.cnblogs.com/feipeng8848/p/6781822.html

原文地址：http://www.cnblogs.com/feipeng8848/p/6781822.html

1.为项目添加POI

POI官网链接

点进去之后下载（上边的是编译好的类，下边的是源代码）

 

 解压文件夹，把下面三个文件复制到WebComtent>WEB-INF>lib文件夹下

再把这三个文件复制到Tomcat的lib文件夹下，否则Tomcat会因为找不到类而报错（这个地方郁闷了一上午）

读取“.xls”格式使用  import org.apache.poi.hssf.usermodel.*;包的内容，例如：HSSFWorkbook
读取“.xlsx”格式使用 import org.apache.poi.xssf.usermodel.*; 包的内容，例如：XSSFWorkbook
读取两种格式使用    import org.apache.poi.ss.usermodel.*    包的内容，例如：Workbook

由于我是读取xslx文件所以使用以上几个jar文件。

注意：

上图中的两个文件夹中也有我们需要的jar文件，具体是哪几个忘记了（当然为了保险也可以把所有的都放进WebContent>WEN-INF>lib下再BuildPath进项目），没关系，一会运行的过程中会报错，根据错误信息再去找到相关的jar文件BuildPath进去就好，注意还要再Tomcat>lib下放置一份副本。

2.读取Excel文件

官方教程：链接

 

类库：链接 

直接看代码吧，不难懂。

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//遍历一个Excel文件<br>private void getExcelData(File file)  {
         
        System.out.println("now in getExcelData" );
        System.out.println("get file name："+file.getName().toString());
         
        XSSFWorkbook workBook= null;
        try {
            workBook  = new XSSFWorkbook(file);
             
             
            int sheetCount = workBook.getNumberOfSheets();  //Sheet的数量
            System.out.println("num of sheet is : "+sheetCount);
             
            //遍历每个sheet
            for(int i=0;i<sheetCount;i++)
            {
                XSSFSheet sheet = workBook.getSheetAt(i);
                //获取总行数
                int rowCount = sheet.getPhysicalNumberOfRows();
                System.out.println("num of row : "+ rowCount);
                System.out.println("i  now in sheet : "+ i);
                //遍历每一行 
                for (int r = 0; r < rowCount; r++) {
                    XSSFRow row = sheet.getRow(r); 
                    //获取总列数 
                    int cellCount = row.getPhysicalNumberOfCells();
                     
                    //遍历每一列 
                     for (int c = 0; c < cellCount; c++) {
                         XSSFCell cell = row.getCell(c);
                          
                         String cellValue = null;
                          
                         switch (cell.getCellTypeEnum()) {
                        case STRING:
                            //System.out.println("celltype is string");
                            cellValue = cell.getStringCellValue(); 
                            break;
                        case NUMERIC:
                            //System.out.println("celltype is Number");//整数，小数，日期
                            cellValue = String.valueOf(cell.getNumericCellValue());
                            break;
                        case BOOLEAN:
                            //System.out.println("celltype is Boolean");
                            cellValue = String.valueOf(cell.getBooleanCellValue()); 
                            break;
                        case FORMULA:
                            //System.out.println("celltype is Formula");//公式
                            cellValue = "错误,不能为公式"; 
                            break;
                        case BLANK:
                            //System.out.println("celltype is Blank");//空白
                            cellValue = cell.getStringCellValue();
                            break;
                        case ERROR:
                            //System.out.println("celltype is Error");
                            cellValue = "错误"; 
                            break;
                         
                        default:
                            //System.out.println("celltype : default");
                            cellValue = "错误";
                            break;                         
                        }
                          
                         System.out.println(cellValue.toString());
                     }
                }
            }
 
             
        } catch (IOException e) {
            System.out.println("File Error IOException : "+e.getMessage());
        }  
        catch (Exception e) {
            // TODO: handle exception
        }
        finally {
            try {
                workBook.close();
            　　 } catch (Exception e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
                System.out.println("workBook.close()&fileInputStream.close()  Error : "+e.getMessage());       
            }
             
            System.out.println("Try Catch : finally");         
        }
         
        System.out.println("hi feipeng8848 getExcelData is done");
    }