很多朋友都想知道java本地excel是什么?怎么读取?下面就一起来了解一下吧~
java excel api:是一开放源码项目,通过它Java开发人员可以读取Excel文件的内容、创建新的Excel文件、更新已经存在的Excel文件。使用该API非Windows操作系统也可以通过纯Java应用来处理Excel数据表。因为它是使用Java编写的,所以在Web应用中可以通过JSP、Servlet来调用API实现对Excel数据表的访问。
Java通过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() { } /***读取Excel*/ public static void readExcel(String filePath) { try { InputStream is = new FileInputStream(filePath); Workbook rwb = Workbook.getWorkbook(is); //这里有两种方法获取sheet表:名字和下标(从0开始) //Sheet st = rwb.getSheet("original"); Sheet st = rwb.getSheet(0); /** //获得第一行第一列单元的值 Cell c00 = st.getCell(0,0); //通用的获取cell值的方式,返回字符串 String strc00 = c00.getContents(); //获得cell具体类型值的方式 if(c00.getType() == CellType.LABEL) { LabelCell labelc00 = (LabelCell)c00; strc00 = labelc00.getString(); } //输出 System.out.println(strc00);*/ //Sheet的下标是从0开始 //获取第一张Sheet表 Sheet rst = rwb.getSheet(0); //获取Sheet表中所包含的总列数 int rsColumns = rst.getColumns(); //获取Sheet表中所包含的总行数 int rsRows = rst.getRows(); //获取指定单元格的对象引用 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(); } //关闭 rwb.close(); } catch(Exception e) { e.printStackTrace(); } } /**输出Excel*/ public static void writeExcel(OutputStream os) { try { /** 只能通过API提供的 工厂方法来创建Workbook,而不能使用WritableWorkbook的构造函数,因为类WritableWorkbook的构造函数为 protected类型:方法一:直接从目标文件中读取 WritableWorkbook wwb = Workbook.createWorkbook(new File(targetfile));方法 二:如下实例所示 将WritableWorkbook直接写入到输出流*/ WritableWorkbook wwb = Workbook.createWorkbook(os); //创建Excel工作表 指定名称和位置 WritableSheet ws = wwb.createSheet("Test Sheet 1",0); /**************往工作表中添加数据*****************/ //1.添加Label对象 Label label = new Label(0,0,"测试"); ws.addCell(label); //添加带有字型Formatting对象 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); //添加带有字体颜色的Formatting对象 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对象 Number labelN = new Number(0,1,3.1415926); ws.addCell(labelN); //添加带有formatting的Number对象 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对象 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对象 jxl.write.DateTime labelDT = new jxl.write.DateTime(0,3,new java.util.Date()); ws.addCell(labelDT); //5.添加带有formatting的DateFormat对象 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.添加图片对象,jxl只支持png格式图片 File image = new File("f:\\1.png"); WritableImage wimage = new WritableImage(0,4,6,17,image); ws.addImage(wimage); //7.写入工作表 wwb.write(); wwb.close(); } catch(Exception e) { e.printStackTrace(); } } /** 将file1拷贝后,进行修改并创建输出对象file2 * 单元格原有的格式化修饰不能去掉,但仍可将新的单元格修饰加上去, * 以使单元格的内容以不同的形式表现 */ 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); //判断单元格的类型,做出相应的转换 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(); } } //测试 public static void main(String args[]) { try { //读EXCEL ExcelHandle.readExcel("F:/红楼人物.xls"); //输出EXCEL File filewrite=new File("F:/红楼人物2.xls"); filewrite.createNewFile(); OutputStream os=new FileOutputStream(filewrite); ExcelHandle.writeExcel(os); //修改EXCEL ExcelHandle.modifyExcel(new File("F:/红楼人物.xls"), new File("F:/红楼人物3.xls")); } catch(Exception e) { e.printStackTrace(); } } }
以上就是小编今天的分享,希望能够帮到大家。