将图片上传到服务器 (Java)

Question

我想从客户端接收图像并将其保存到文件夹中。当我从 POST-MAN 收到它时，它只生成字节：

ˇÿˇ‡ JFIF H H ˇ· XExif MM * ái & † † † ± ˇÌ 8Photoshop 3.0 8BIM 8BIM % ‘ åŸè ≤ ÈÄ òÏ¯B~ˇ¿ ± " ˇƒ

没关系，我可以收到并保存。

但是当我尝试从 IOS 接收信息时，它也在正文中向我发送了一些信息：

--Boundary+71ADC8832D9A5F95
Content-Disposition: form-data; name="file"; filename="fileName.jpg"
Content-Type: image/jpeg

ˇÿˇ‡ JFIF H H ˇ· XExif MM * ái & † † † ± ˇÌ 8Photoshop 3.0 8BIM 8BIM % ‘ åŸè ≤ ÈÄ òÏ¯B~ˇ¿ ± " ˇƒ

如何从中获取唯一图像？

我的Java代码是：

InputStream stream = request.getInputStream();
bytes = IOUtils.toByteArray(stream);
File file = new File("myfile/1.jpg");
BufferedImage img = ImageIO.read(new ByteArrayInputStream(bytes));
ImageIO.write(img, "JPEG", file);

更新： 对于分段上传图片，我添加了代码：

if(request instanceof MultipartHttpServletRequest){
    /**
     * multipart
     */
    MultipartHttpServletRequest mrequest = (MultipartHttpServletRequest) request;
    Iterator<String> itr =  mrequest.getFileNames();
    MultipartFile file = mrequest.getFile(itr.next());
    bytes = file.getBytes();
}

但它不是MultipartHttpServletRequest的实例。为什么？

Answer 1

我找到了解决方案：

spring 和 tomcat 配置中的问题....我添加了

<Context
   allowCasualMultipartParsing="true" />

在 server.xml 中 tomcat。

然后将 bean 添加到 WebConfig：

@Bean
public MultipartResolver multipartResolver() {
    CommonsMultipartResolver resolver = new CommonsMultipartResolver();
    resolver.setDefaultEncoding("utf-8");
    return resolver;
}

Answer 2

试试这个代码。它对我有用。将代码放入带有 <% %> 标签的 jsp 页面本身

<%
Connection conn=null;
   Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver").newInstance();
    conn = DriverManager.getConnection(//your connection string//);

   PreparedStatement psImageInsertDatabase=null;
   PreparedStatement psImageInsertDatabase2=null;



   byte[] b=null;
   try{

      String temp=(String)session.getAttribute("myId");
      String sqlImageInsertDatabase="insert into upload_image (bImage) values (?)";
      String sqlImageInsertDatabase2="UPDATE [dbo].[upload_image] SET [iImageID] = '"+temp+"' WHERE [iImageID] is null AND [bImage] is not null";
      psImageInsertDatabase=conn.prepareStatement(sqlImageInsertDatabase);

      DiskFileItemFactory factory = new DiskFileItemFactory();

      ServletFileUpload sfu = new ServletFileUpload(factory);
      List items = sfu.parseRequest(request);

      Iterator iter = items.iterator();

      while (iter.hasNext()) {
         FileItem item = (FileItem) iter.next();
         if (!item.isFormField()) {
              b = item.get();
          }
      }

      psImageInsertDatabase.setBytes(1,b);
      psImageInsertDatabase.executeUpdate();

      psImageInsertDatabase2=conn.prepareStatement(sqlImageInsertDatabase2);
      psImageInsertDatabase2.executeUpdate();
   }
   catch(Exception e)
   {
     e.printStackTrace();
     response.sendRedirect("addimage.jsp");
   }

%>

将图片上传到服务器 (Java)

Upload image to server (Java)

java

upload

spring

image

http