用Java写一个多图片上传

可以使用 Java 语言开发一个多图片上传功能，下面是一个简单的示例代码：

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.ServletException;
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;

public class UploadServlet extends HttpServlet {

    private static final long serialVersionUID = 1L;

    protected void doPost(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
        // 设置编码
        request.setCharacterEncoding("UTF-8");
        response.setCharacterEncoding("UTF-8");

        // 判断请求类型是否是多媒体上传
        boolean isMultipart = ServletFileUpload.isMultipartContent(request);
        if (!isMultipart) {
            response.getWriter().println("不是多媒体上传");
            return;
        }

        // 设置文件上传工厂
        DiskFileItemFactory factory = new DiskFileItemFactory();
        ServletFileUpload upload = new ServletFileUpload(factory);

        try {
            // 解析请求中的所有文件
            List<FileItem> items = upload.parseRequest(request);
            List<String> filePaths = new ArrayList<>();
            for (FileItem item : items) {
                if (!item.isFormField()) {
                    String fileName = item.getName();
                    String path = "文件存储路径" + File.separator + fileName;
                    File storeFile = new File(path);
                    filePaths.add(path);
                    item.write(storeFile);
                }
            }
            response.getWriter().println("上传成功，文件路径分别为：" + filePaths);
        } catch (Exception e) {
            response.getWriter().println("上传失败");
        }
    }
}

该代码使用 Apache Commons FileUpload 库实现了文件上传功能。

注意：需要在项目中引入 Apache Commons FileUpload