Question

基本上我有type="file"将图像发送到服务器，在服务器中我需要检查图像大小是否不高于1MB，如果它向客户端发送有关图像大小的错误，那么客户端可能会向用户弹出错误。

这是我的servlet脚本：

@MultipartConfig(
    maxFileSize=1024*1024     // 1Mb max
)
public class ProPicUploader extends HttpServlet {
private static final long serialVersionUID = 1L;
public void init() throws ServletException
{
    System.out.println("Initiate method is called in " + this.getClass().getName());
}
public void doPost(HttpServletRequest request, 
      HttpServletResponse response)
      throws ServletException, IOException {
    response.setContentType("text/html");
    PrintWriter out = response.getWriter();

    try{
        MultipartRequest multipartRequest = new MultipartRequest(request, "D:\\");
    } catch(IOException e){
        out.print("Image size is bigger than 1MB");
        System.out.println(e.getMessage());
    }
    out.print("Successfully Uploaded");
}
public void destroy(){
    System.out.println("Destory method is called in: " + this.getClass().getName());
}
}

客户端脚本：

if(formdata){
        $.ajax({
            url: '../propicuploader',
            type: 'POST',
            data: formdata,
            processData: false,
            contentType: false,
            success: function(data){
                alert(data);
                if(data == "0x00000035"){
                    $("#NotPictureerror_spn").text("File size is too big, Please select a file upto 2MB");
                }
            }
            error: function(data){
                alert(data);
            }
        });
    }

和我的web.xml脚本：

 <?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
  <display-name>Duck</display-name>
  <welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
  <servlet>
    <servlet-name>ProPicUploader</servlet-name>
    <servlet-class>/ProPicUploader</servlet-class>
  </servlet>
</web-app>

到目前为止，如果图像大小低于1MB，它会显示Successfully Uploaded，但如果图像大小高于1MB，它会弹出任何内容，尽管我已经输入了发送错误out.print("Image size is bigger than 1MB")但我的错误客户永远不会收到它。

如果有人告诉我我做错了什么，我真的很感激。）

Answer 1

删除此部分

@MultipartConfig(
    maxFileSize=1024*1024     // 1Mb max
)

然后重试。默认情况下，MultipartRequest将上传大小限制为1兆字节

在java

1 个答案: