enctype发生文件上传代码错误 [英] file upload code error occures by the enctype

问题描述

在用Java上传文件时，总是向数据库输入null值，我认为是因为表单标签中的enctype ="multipart/form-data"

when uploading a file in java, always enters null value to the database , i think it because of the enctype="multipart/form-data" in the form tag

推荐答案

在将Mime Type值放入数据库之前，必须先获取它.
例如:

You must get the Mime Type value before putting it into your database
For example:

import java.net.*;

public class GetMimeType {
public static void main(String[] args) {
 FileNameMap fileNameMap = URLConnection.getFileNameMap();
 String mimeType = fileNameMap.getContentTypeFor("JavaFile.jsp");
 System.out.println("mimeType="+ mimeType);
 }
}

.JSP文件的Mime类型为:mime类型"text/html"

The Mime Type for .JSP files are: mime type "text/html"

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