java讀取本地excel

很多朋友都想知道java本地excel是什麼？怎麼讀取？下面就一起來了解一下吧~
java excel api:是一開放源碼項目，通過它Java開發人員可以讀取Excel文件的內容、創建新的Excel文件、更新已經存在的Excel文件。使用該API非Windows操作系統也可以通過純Java應用來處理Excel數據表。因爲它是使用Java編寫的，所以在Web應用中可以通過JSP、Servlet來調用API實現對Excel數據表的訪問。
Java通過jexcelapi包操作excel文件：
//in ExcelHandle    import jxl.*;    import jxl.format.UnderlineStyle;    import jxl.write.*;    import jxl.write.Number;    import jxl.write.Boolean;    import jxl.Cell;    import java.io.*;    public class ExcelHandle    {        public ExcelHandle()        {        }        /***讀取Excel*/        public static void readExcel(String filePath)        {            try            {                InputStream is = new FileInputStream(filePath);                Workbook rwb = Workbook.getWorkbook(is);                //這裏有兩種方法獲取sheet表:名字和下標（從0開始）                //Sheet st = rwb.getSheet("original");                Sheet st = rwb.getSheet(0);                /**                //獲得第一行第一列單元的值                Cell c00 = st.getCell(0,0);                //通用的獲取cell值的方式,返回字符串                String strc00 = c00.getContents();                //獲得cell具體類型值的方式                if(c00.getType() == CellType.LABEL)                {                    LabelCell labelc00 = (LabelCell)c00;                    strc00 = labelc00.getString();                }                //輸出                System.out.println(strc00);*/                //Sheet的下標是從0開始                //獲取第一張Sheet表                Sheet rst = rwb.getSheet(0);                //獲取Sheet表中所包含的總列數                int rsColumns = rst.getColumns();                //獲取Sheet表中所包含的總行數                int rsRows = rst.getRows();                //獲取指定單元格的對象引用                for (int i = 0; i < rsRows; i++)                {                    for (int j = 0; j < rsColumns; j++)                    {                        Cell cell = rst.getCell(j, i);                        System.out.print(cell.getContents() + " ");                    }                    System.out.println();                }                //關閉                rwb.close();            }            catch(Exception e)            {                e.printStackTrace();            }        }        /**輸出Excel*/        public static void writeExcel(OutputStream os)        {            try            {       /** 只能通過API提供的 工廠方法來創建Workbook，而不能使用WritableWorkbook的構造函數，因爲類WritableWorkbook的構造函數爲 protected類型：方法一：直接從目標文件中讀取 WritableWorkbook wwb = Workbook.createWorkbook(new File(targetfile));方法 二：如下實例所示 將WritableWorkbook直接寫入到輸出流*/                WritableWorkbook wwb = Workbook.createWorkbook(os);                //創建Excel工作表 指定名稱和位置                WritableSheet ws = wwb.createSheet("Test Sheet 1",0);                /**************往工作表中添加數據*****************/                //1.添加Label對象                Label label = new Label(0,0,"測試");                ws.addCell(label);                //添加帶有字型Formatting對象                WritableFont wf = new WritableFont(WritableFont.TIMES,18,WritableFont.BOLD,true);                WritableCellFormat wcf = new WritableCellFormat(wf);                Label labelcf = new Label(1,0,"this is a label test",wcf);                ws.addCell(labelcf);                //添加帶有字體顏色的Formatting對象                WritableFont wfc = new WritableFont(WritableFont.ARIAL,10,WritableFont.NO_BOLD,false,                        UnderlineStyle.NO_UNDERLINE,jxl.format.Colour.DARK_YELLOW);                WritableCellFormat wcfFC = new WritableCellFormat(wfc);                Label labelCF = new Label(1,0,"Ok",wcfFC);                ws.addCell(labelCF);                //2.添加Number對象                Number labelN = new Number(0,1,3.1415926);                ws.addCell(labelN);                //添加帶有formatting的Number對象                NumberFormat nf = new NumberFormat("#.##");                WritableCellFormat wcfN = new WritableCellFormat(nf);                Number labelNF = new jxl.write.Number(1,1,3.1415926,wcfN);                ws.addCell(labelNF);                //3.添加Boolean對象                Boolean labelB = new jxl.write.Boolean(0,2,true);                ws.addCell(labelB);                Boolean labelB1 = new jxl.write.Boolean(1,2,false);                ws.addCell(labelB1);                //4.添加DateTime對象                jxl.write.DateTime labelDT = new jxl.write.DateTime(0,3,new java.util.Date());                ws.addCell(labelDT);                //5.添加帶有formatting的DateFormat對象                DateFormat df = new DateFormat("dd MM yyyy hh:mm:ss");                WritableCellFormat wcfDF = new WritableCellFormat(df);                DateTime labelDTF = new DateTime(1,3,new java.util.Date(),wcfDF);                ws.addCell(labelDTF);                //6.添加圖片對象,jxl只支持png格式圖片                File image = new File("f:1.png");                WritableImage wimage = new WritableImage(0,4,6,17,image);                ws.addImage(wimage);                //7.寫入工作表                wwb.write();                wwb.close();            }            catch(Exception e)            {                e.printStackTrace();            }        }        /** 將file1拷貝後,進行修改並創建輸出對象file2         * 單元格原有的格式化修飾不能去掉，但仍可將新的單元格修飾加上去，         * 以使單元格的內容以不同的形式表現         */        public static void modifyExcel(File file1,File file2)        {            try            {                Workbook rwb = Workbook.getWorkbook(file1);                WritableWorkbook wwb = Workbook.createWorkbook(file2,rwb);//copy                WritableFont wfc = new WritableFont(WritableFont.ARIAL,10,WritableFont.NO_BOLD,false,                        UnderlineStyle.NO_UNDERLINE,jxl.format.Colour.BLUE);                WritableCellFormat wcfFC = new WritableCellFormat(wfc);                WritableSheet ws = wwb.getSheet(0);                WritableCell wc = ws.getWritableCell(0,0);                //判斷單元格的類型,做出相應的轉換                if(wc.getType() == CellType.LABEL)                {                    Label labelCF =new Label(0,0,"人物（新）",wcfFC);                    ws.addCell(labelCF);                  //Label label = (Label)wc;                  //label.setString("被修改");                }              wwb.write();                wwb.close();                rwb.close();            }            catch(Exception e)            {                e.printStackTrace();            }        }        //測試        public static void main(String args[])        {            try            {                //讀EXCEL            ExcelHandle.readExcel("F:/紅樓人物.xls");                //輸出EXCEL            File filewrite=new File("F:/紅樓人物2.xls");            filewrite.createNewFile();            OutputStream os=new FileOutputStream(filewrite);            ExcelHandle.writeExcel(os);                //修改EXCEL            ExcelHandle.modifyExcel(new File("F:/紅樓人物.xls"), new File("F:/紅樓人物3.xls"));            }            catch(Exception e)            {            e.printStackTrace();            }        }    }