Servlet3文件上传

文件上传：MultipartConfig 

https://github.com/antonio2306/joy-demo/blob/master/src/main/java/cn/joy/demo/external/upload/Servlet3FileUpload.java

 form的enctype 标签：http://www.w3school.com.cn/tags/att_form_enctype.asp

配合多线程。

jsp代码：

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
    
    <!-- enctype="multipart/form-data":不对字符编码。在使用包含文件上传控件的表单时，必须使用该值。 -->
    <form action="/JSPweb/FileUploadServlet" method="post" enctype="multipart/form-data" >
        <input type="text" name="text" value="textTest" />
        <input type="file" name="fileToUpload" /><br />
        <input type="submit" value="上传" /> 
    </form>
</body>
</html>

 

servlet代码：

@WebServlet("/FileUploadServlet")
// servlet3新特性，通过添加注释上传文件
@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#doGet(HttpServletRequest request, HttpServletResponse
     *      response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException,
            IOException {
        doPost(request,response);
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse
     *      response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException,
            IOException {

        String string = request.getParameter("text");
        System.out.println(string);

        Part part = request.getPart("fileToUpload");
        if (part == null) {
            System.out.println(this.toString() + "part is null");
        }
        String mime = part.getContentType();
        String ext = "";
        if ("image/jpeg".equals(mime)) {
            ext = ".jpg";
        } else {
            response.getWriter().println("您上传的文件类型不合法");
            return;
        }
        String filleName = UUID.randomUUID().toString();
        String path = getServletContext().getRealPath("/upload");
        File dir = new File(path);
        if (!dir.exists()) {
            dir.mkdirs();
        }
        File file = new File(dir, filleName + ext);
        part.write(file.getPath());
    }

}

 

posted @ 2015-09-08 20:45  pepelu  阅读(375)  评论(0)    收藏  举报