t2045817161
t2045817161
采纳率24.4%
2016-12-04 16:08 阅读 1.4k
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java将查询到的数据导入Excel中

我现在从订单表中将数据查出来,然后导入桌面上名为order.xsl的文件中已经做完了,问题是每次导数据都会新建一个order.xsl的文件,依次类推(第一次导数据生成order.xsl,再导生成一个order(1).xsl,第三次生成order(2).xsl),能不能这样,每次导数据时判断文件是否存在,如果不存在则新建excel文件并写入数据,如果存在就在这个存在的文件下继续写数据(接着原来的数据下面写,这里要如何获取该Excel文件最后一行数据的行标),具体该如何做呢?哪位大神请指教下,有两个难点,一是判断Excel文件是否存在,如果存在,则在该文件下继续写数据,二是如何获取最后一行数据的行标,用来在下面继续写数据。

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2条回答 默认 最新

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    caozhy 从今以后生命中的每一秒都属于我爱的人 2016-12-04 16:20
  • buquan4041 Leslie丶 2016-12-04 18:26
     import jxl.*;   
    import jxl.write.*;   
    import java.io.*;   
    import java.io.File.*;   
    import java.util.*;   
    
    public class excel   
    {   
    public static void main(String[] args)    
    {   
    
    String targetfile = "c:/out.xls";//输出的excel文件名   
    String worksheet = "List";//输出的excel文件工作表名   
    String[] title = {"ID","NAME","DESCRIB"};//excel工作表的标题   
    
    WritableWorkbook workbook;   
    try 
    {   
    //创建可写入的Excel工作薄,运行生成的文件在tomcat/bin下   
    //workbook = Workbook.createWorkbook(new File("output.xls"));    
    System.out.println("begin");   
    
    OutputStream os=new FileOutputStream(targetfile);    
    workbook=Workbook.createWorkbook(os);    
    
    WritableSheet sheet = workbook.createSheet(worksheet, 0); //添加第一个工作表   
    //WritableSheet sheet1 = workbook.createSheet("MySheet1", 1); //可添加第二个工作   
    /* 
    jxl.write.Label label = new jxl.write.Label(0, 2, "A label record"); //put a label in cell A3, Label(column,row) 
    sheet.addCell(label);   
    */ 
    
    jxl.write.Label label;   
    for (int i=0; i<title.length; i++)   
    {   
    //Label(列号,行号 ,内容 )   
    label = new jxl.write.Label(i, 0, title[i]); //put the title in row1    
    sheet.addCell(label);    
    }   
    
    //下列添加的对字体等的设置均调试通过,可作参考用   
    
    //添加数字   
    jxl.write.Number number = new jxl.write.Number(3, 4, 3.14159); //put the number 3.14159 in cell D5   
    sheet.addCell(number);   
    
    //添加带有字型Formatting的对象    
    jxl.write.WritableFont wf = new jxl.write.WritableFont(WritableFont.TIMES,10,WritableFont.BOLD,true);    
    jxl.write.WritableCellFormat wcfF = new jxl.write.WritableCellFormat(wf);    
    jxl.write.Label labelCF = new jxl.write.Label(4,4,"文本",wcfF);    
    sheet.addCell(labelCF);    
    
    //添加带有字体颜色,带背景颜色 Formatting的对象    
    jxl.write.WritableFont wfc = new jxl.write.WritableFont(WritableFont.ARIAL,10,WritableFont.BOLD,false,jxl.format.UnderlineStyle.NO_UNDERLINE,jxl.format.Colour.RED);    
    jxl.write.WritableCellFormat wcfFC = new jxl.write.WritableCellFormat(wfc);    
    wcfFC.setBackground(jxl.format.Colour.BLUE);   
    jxl.write.Label labelCFC = new jxl.write.Label(1,5,"带颜色",wcfFC);    
    sheet.addCell(labelCFC);    
    
    //添加带有formatting的Number对象    
    jxl.write.NumberFormat nf = new jxl.write.NumberFormat("#.##");    
    jxl.write.WritableCellFormat wcfN = new jxl.write.WritableCellFormat(nf);    
    jxl.write.Number labelNF = new jxl.write.Number(1,1,3.1415926,wcfN);    
    sheet.addCell(labelNF);    
    
    //3.添加Boolean对象    
    jxl.write.Boolean labelB = new jxl.write.Boolean(0,2,false);    
    sheet.addCell(labelB);    
    
    //4.添加DateTime对象    
    jxl.write.DateTime labelDT = new jxl.write.DateTime(0,3,new java.util.Date());    
    sheet.addCell(labelDT);    
    
    //添加带有formatting的DateFormat对象    
    jxl.write.DateFormat df = new jxl.write.DateFormat("ddMMyyyyhh:mm:ss");    
    jxl.write.WritableCellFormat wcfDF = new jxl.write.WritableCellFormat(df);    
    jxl.write.DateTime labelDTF = new jxl.write.DateTime(1,3,new java.util.Date(),wcfDF);    
    sheet.addCell(labelDTF);    
    
    //和宾单元格   
    //sheet.mergeCells(int col1,int row1,int col2,int row2);//左上角到右下角   
    sheet.mergeCells(4,5,8,10);//左上角到右下角   
    wfc = new jxl.write.WritableFont(WritableFont.ARIAL,40,WritableFont.BOLD,false,jxl.format.UnderlineStyle.NO_UNDERLINE,jxl.format.Colour.GREEN);    
    jxl.write.WritableCellFormat wchB = new jxl.write.WritableCellFormat(wfc);    
    wchB.setAlignment(jxl.format.Alignment.CENTRE);   
    labelCFC = new jxl.write.Label(4,5,"单元合并",wchB);    
    sheet.addCell(labelCFC); //   
    
    //设置边框   
    jxl.write.WritableCellFormat wcsB = new jxl.write.WritableCellFormat();    
    wcsB.setBorder(jxl.format.Border.ALL,jxl.format.BorderLineStyle.THICK);   
    labelCFC = new jxl.write.Label(0,6,"边框设置",wcsB);    
    sheet.addCell(labelCFC);    
    workbook.write();    
    workbook.close();   
    }catch(Exception e)    
    {    
    e.printStackTrace();    
    }    
    System.out.println("end");   
    Runtime r=Runtime.getRuntime();    
    Process p=null;    
    //String cmd[]={"notepad","exec.java"};    
    String cmd[]={"C:\\Program Files\\Microsoft Office\\Office\\EXCEL.EXE","out.xls"};    
    try{    
    p=r.exec(cmd);    
    }    
    catch(Exception e){    
    System.out.println("error executing: "+cmd[0]);    
    }   
    
    }   
    }
    
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