我正在尝试上传图像名称和数据库中的一些数据以及项目中某个文件夹中的图像，如果用户上传图像，则其名称应与一些数据一起存储在数据库中，并且该图像应存储在网络中的某个文件夹中内容，我尝试了这个，我只能在数据库中存储图像名称，但数据和图像不会存储，显示为“null”
jsp代码:
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Image Upload</title>
</head>
<body>
<form action="AddProImg" method="post" enctype="multipart/form-data">
<input type="text" name="imgname"><br>
<input type="file" name="img">
<input type="submit" value="upload">
</form>
</body>
</html>
java代码:
import java.io.*;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.util.*;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
@WebServlet("/AddProImg")
public class AddProImg extends HttpServlet {
private String filePath;
private int maxFileSize = 1000 * 1024;
private int maxMemSize = 1000 * 1024;
private File file;
public void init() {
filePath = getServletContext().getInitParameter("file-upload");
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, java.io.IOException {
response.setContentType("text/html");
java.io.PrintWriter out = response.getWriter();
DiskFileItemFactory factory = new DiskFileItemFactory();
// maximum size that will be stored in memory
factory.setSizeThreshold(maxMemSize);
// Location to save data that is larger than maxMemSize.
factory.setRepository(new File(" C://"));
// Create a new file upload handler
ServletFileUpload upload = new ServletFileUpload(factory);
// maximum file size to be uploaded.
upload.setSizeMax(maxFileSize);
try {
Class.forName("com.mysql.jdbc.Driver");
Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/practise", "root", "vicky");
// Parse the request to get file items.
List<?> fileItems = upload.parseRequest(request);
// Process the uploaded file items
Iterator<?> i = fileItems.iterator();
out.println("<html>");
out.println("<head>");
out.println("<title>Servlet upload</title>");
out.println("</head>");
out.println("<body>");
while (i.hasNext()) {
FileItem fi = (FileItem) i.next();
if (!fi.isFormField()) {
// Get the uploaded file parameters
String fileName = fi.getName();
// Write the file
if (fileName.lastIndexOf("\\") >= 0) {
file = new File(filePath + fileName.substring(fileName.lastIndexOf("\\")));
} else {
file = new File(filePath + fileName.substring(fileName.lastIndexOf("\\") + 1));
}
String name = request.getParameter("imgname");
String s = fileName.substring(fileName.lastIndexOf("\\") + 1);
PreparedStatement ps = con.prepareStatement("insert into imgtable(imgname,imgpic) values(?,?)");
ps.setString(1, name);
ps.setString(2, s);
int z = ps.executeUpdate();
fi.write(file);
if (z != 0) {
out.println("Success");
} else {
out.println("Error Occured");
}
}
}
out.println("</body>");
out.println("</html>");
} catch (Exception ex) {
System.out.println(ex);
}
}
}
web.xml:
<?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>PractiseImage</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>
<context-param>
<description>Location to store uploaded file</description>
<param-name>file-upload</param-name>
<param-value>D:\WorkSpace\Realestate\WebContent\UploadedImages\ </param-value>
</context-param>
</web-app>
最佳答案
您无法使用
String name = request.getParameter("imgname");
您需要编写如下所示的其他条件
if (!fi.isFormField()) {
//to read parameter and value
String name = fi.getFieldName();
String value = fi.getString();
我认为这应该有效
关于java - 仅上传图像名称以及数据库中的一些数据，并且仅图像应存储在网页内容的文件夹中，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/54996426/