Java Apache POI Opening file? [closed]

问题:

I have a Java program that edits an existing excel file and saves it as a new file. However, I would also like the program to automatically open the newly created file upon ending. Is there an apache poi command that lets me do this?

回答1:

As you have not Provided Code , I m using the Example of ViralPatel Tutorial

Lets Create Excel File First

HSSFWorkbook workbook = new HSSFWorkbook();
        HSSFSheet sheet = workbook.createSheet("Sample sheet");

    Map<String, Object[]> data = new HashMap<String, Object[]>();
    data.put("1", new Object[] { "Emp No.", "Name", "Salary" });
    data.put("2", new Object[] { 1d, "John", 1500000d });
    data.put("3", new Object[] { 2d, "Sam", 800000d });
    data.put("4", new Object[] { 3d, "Dean", 700000d });

    Set<String> keyset = data.keySet();
    int rownum = 0;
    for (String key : keyset) {
        Row row = sheet.createRow(rownum++);
        Object[] objArr = data.get(key);
        int cellnum = 0;
        for (Object obj : objArr) {
            Cell cell = row.createCell(cellnum++);
            if (obj instanceof Date)
                cell.setCellValue((Date) obj);
            else if (obj instanceof Boolean)
                cell.setCellValue((Boolean) obj);
            else if (obj instanceof String)
                cell.setCellValue((String) obj);
            else if (obj instanceof Double)
                cell.setCellValue((Double) obj);
        }
    }

    try {
        FileOutputStream out = new FileOutputStream(new File("D:\\new.xls"));
        workbook.write(out);
        out.close();
        System.out.println("Excel written successfully..");

        /** Opening Excel File From Java **/

        try {
            Desktop.getDesktop().open(new File("D:\\new.xls"));
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }

Output

Solution : Put this code with Try/Catch Block after You have created Excel with correct Location, It will be opened Automatically

Desktop.getDesktop().open(new File("D:\new.xls"));

Else u can invoke this as well

Try to use Desktop.open() instead of Desktop.edit() :

Desktop dt = Desktop.getDesktop();
dt.open(new File("D:\\new.xls"));

If Desktop.open() is not available then the Windows file association can be used :

 Process p =    Runtime.getRuntime()    .exec("rundll32
 url.dll,FileProtocolHandler " + "D:\\new.xls");

回答2:

Take a look at How to Integrate with the Desktop Class and Desktop JavaDoc

回答3:

I don't know wheter POI is providing such methods or not. However you can do this using simple java method that uses the command prompt and open the desired file using start command.

public static void openExcelFile(){
    try{    
        Runtime.getRuntime().exec("cmd /c start "+FilePath);
    }catch(IOException  e){  
        e.printStackTrace();  
    }
}

NOTE: The space after start is mandatory. Don't forget it