大二上每日总结

今日学习了文件的简单的上传：

要想实现文件上传，要将<input>标签的type设为“file”，而且form表单的method方法必须为post，

不然只会上传文件的名字，form表单还要设置enctype属性为：multipart/form-data。这是将文件转化为二进制流。

在servlet中使用InputStream接受，inputstream=req.inputStream();之后的操作与java读写文件一样。

protected void doPost(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        // TODO Auto-generated method stub
        InputStream inputstream=req.getInputStream();
        Reader reader=new InputStreamReader(inputstream);
        BufferedReader buffreader=new BufferedReader(reader);
        OutputStream outputstream=new FileOutputStream("F:\\copy.txt");
        Writer writer=new OutputStreamWriter(outputstream);
        BufferedWriter buffwriter=new BufferedWriter(writer);
        String str="";
        while((str=buffreader.readLine())!=null)
        {
            System.out.println(str);
            buffwriter.write(str+"\n\r");
        }
        buffreader.close();
        buffwriter.close();
        reader.close();
        inputstream.close();
        outputstream.close();
        writer.close();
        
    }