java文件操作

一、文件自定义保存

    private void writeInfoToExcel(TCComponentBOMLine[] needToEditBomresult, ) throws TCException {
    // 第一步创建workbook
    HSSFWorkbook wb = new HSSFWorkbook();
    if (null != needToEditBomresult && needToEditBomresult.length > 0) {
        HSSFSheet needToEditBomsheet = wb.createSheet("检查");
        HSSFRow needToEditBomrow = needToEditBomsheet.createRow(0);
        HSSFCellStyle style = wb.createCellStyle();
        style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
        String[] needToEditTitle = new String[] { "第一列", "第二列", "第三列", "第四列" };
        for (int i = 0; i < 4; i++) {
            HSSFCell needToEditBomcell = needToEditBomrow.createCell(i);
            needToEditBomcell.setCellValue(needToEditTitle[i]);
        }
        needToEditBomsheet.setColumnWidth(0, 20 * 256);//设置列宽
        needToEditBomsheet.setColumnWidth(1, 30 * 256);
        needToEditBomsheet.setColumnWidth(2, 10 * 256);
        needToEditBomsheet.setColumnWidth(3, 10 * 256);

        System.out.println("创建sheet表1");

        for (int j = 0; j < needToEditBomresult.length; j++) {
            try {
                // 创建行
                needToEditBomrow = needToEditBomsheet.createRow(j + 1);
                // 创建单元格并且添加数据
                needToEditBomrow.createCell(0).setCellValue(needToEditBomresult[j].getProperty("bl_item_item_id"));
            needToEditBomrow.createCell(1).setCellValue(needToEditBomresult[j].getProperty("bl_item_object_name"));
                needToEditBomrow.createCell(2).setCellValue(needToEditBomresult[j].getProperty("xk8_spa_type"));
                needToEditBomrow.createCell(3).setCellValue(needToEditBomresult[j].getProperty("xk8_box_type"));
            } catch (TCException e) {
                e.printStackTrace();
            }
        }
    }

    FileNameExtensionFilter filter = new FileNameExtensionFilter("*.xls", "xls");
    JFileChooser fc = new JFileChooser();
    fc.setFileFilter(filter);
    fc.setMultiSelectionEnabled(false);
    int results = fc.showSaveDialog(null);
    if (results == JFileChooser.APPROVE_OPTION) {
        File file = fc.getSelectedFile();
        if (!file.getPath().endsWith(".xls")) {
            file = new File(file.getPath() + ".xls");
        }
        System.out.println("file path=" + file.getPath());
        try {
            if (!file.exists()) {// 文件不存在 则创建一个
                file.createNewFile();
            }
            FileOutputStream fout = new FileOutputStream(file.getPath());
            wb.write(fout);
            fout.close();
        } catch (IOException e) {
            System.err.println("文件创建失败：");
            e.printStackTrace();
        }
    }
}

二、打开文件
Runtime.getRuntime().exec(“cmd /c start d://a.xls”) ;
getRuntime()是取得系统运行时环境
start参数表名直接启动excel文件,相当于双击操作 ,是个windows命令.