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Servlet3.0上传文件

news 2025/8/18 17:33:14

页面：

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>文件上传</title>
</head>
<body>
   <form action="fileup" enctype="multipart/form-data" method="post">
       <input type="file" name="file" required="required"/><br />
       <input name="remark" required="required"/><br/>
       <button type="submit">上传</button>
   </form>
</body>
</html>

后台：

/**
* @MultipartConfig 3.0条加注解MultipartConfig 就可以获取到参数值了
*/
@WebServlet("/fileup")
@MultipartConfig
public class FileUpLoadServlet extends HttpServlet {
private static final long serialVersionUID = 1L;

/**
* @see HttpServlet#HttpServlet()
*/
public FileUpLoadServlet() {
super();
// TODO Auto-generated constructor stub
}

   /**
   * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
   */
   protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
       // TODO Auto-generated method stub
       request.setCharacterEncoding("UTF-8");

       String remark = request.getParameter("remark");
       System.out.println("获取到值remark："+remark);

       //3.0可以获取文件
       Part file = request.getPart("file");

       //保存文件到D盘
       String dest = "D:\\wwwroot";
       // 保存文件到一个上传的目录   file.getSubmittedFileName()
       System.out.println("file.getName()-->"+file.getName());
       System.out.println("file.getContentType()-->"+file.getContentType());
       System.out.println("file.getSize()-->"+file.getSize());
       System.out.println("file.getSubmittedFileName()-->"+file.getSubmittedFileName());
       System.out.println("file.hashCode()-->"+file.hashCode());
       System.out.println("file.toString()-->"+file.toString());
       System.out.println("file.getHeaderNames()-->"+file.getHeaderNames());
       //C:\Users\Administrator\Desktop\tup.ico 截取最后一个 \ 后面的文件名
       Path target = Paths.get(dest, file.getSubmittedFileName().substring(file.getSubmittedFileName().lastIndexOf(File.separator), file.getSubmittedFileName().length()));
       System.out.println("文件保存的目标路径：" + target);
       try (InputStream in = file.getInputStream()) {
           Files.copy(in, target);
       } finally {
           // Part对象使用完以后，需要删除掉，否则临时文件可能一直都在硬盘上
           file.delete();
       }
   }