Servlet Java Web Development (6) Upload downloads and mailings

Upload

Let's look at an example:

The code corresponding to the form

<form action= "<c:url value= '/upload1servlet '/>" method= "post" enctype= "Multipart/form-data" >   User name;<input type= "text" name= "username"/><br/>   photos:<input type= "file" Name= " Zhaopian "/><br/>  <input type=" Submit "value=" Upload "/></form>

Note Methods Post,enctype and type= "file"

Upload1servlet can pass through the print stream.

Content of the HTTP protocol

In the header, followed by Content-type:multipart/form-data, followed by a row of boundary=------------------------d232olxdk22l

Or something like a complex string. After the header ends there are

Then there is the binary content of the uploaded file,

Servlet Java Web Development (6) Upload downloads and mailings