1. 如果我们要想读写数据到SD卡中,首先必须知道SD的路径: File file = new File(Environment.getExternalStorageDirectory(),"info.txt"); FileOutputStream fos = new FileOutputStream(file);//打开输出流,相应的路径下创建文件info.txt fos.write("This is a good Boy".getBytes()); //pub
将数据库中的数据导出为excel文件,供其他人查看 public class POITest { public static void main(String[] args) { POITest test = new POITest(); // test.readExcelToDB(); test.writeExcelFromDB(); } static class Book{ public String title; public String author; public String da