SSM单文件上传

前端

<form action="/file/fileupload" method="post" enctype="multipart/form-data">
    <label>文件上传</label>
    <input type="file" name="file">
    <input type="submit" value="提交">
</form>

后端

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletRequest;
import java.io.File;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

@Controller
@RequestMapping("/file")
public class FileUploadUtils {
    @RequestMapping("/fileupload")
    public @ResponseBody
    String upload(MultipartFile file, HttpServletRequest request) throws IOException {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmssSS");
        String res = sdf.format(new Date());

        // uploads文件夹位置
        String rootPath = request.getSession().getServletContext().getRealPath("resource/uploads/");

        // 原始名称
        String originalFileName = file.getOriginalFilename();
        // 新文件名
        // String newFileName = "sliver" + res + originalFileName.substring(originalFileName.lastIndexOf("."));
        String newFileName = "sliver" +originalFileName;

        System.out.println("============================测试开始=============================");
        System.out.println("request.getSession()=" + request.getSession());
        System.out.println("request.getSession().getServletContext()=" + request.getSession().getServletContext());
        System.out.println("request.getSession().getServletContext().getRealPath(\"resource/uploads/\")=" + request.getSession().getServletContext().getRealPath("resource/uploads/"));
        System.out.println("原始文件名称:" + originalFileName);  

        //插入数据库
//        BaseInformationAttachment attachment = new BaseInformationAttachment();
//        attachment.setId(UUID.randomUUID().toString());
//        attachment.setAttachmentRealName(originalFileName);
//        attachment.setAttachmentPath(rootPath + originalFileName);
//        System.out.println("实际路径：" + (rootPath + originalFileName));
//        service.insert(attachment);

      
        System.out.println("============================测试结束=============================");


        // 创建年月文件夹
        Calendar date = Calendar.getInstance();
        File dateDirs = new File(date.get(Calendar.YEAR) + File.separator + (date.get(Calendar.MONTH)+1));

        // 新文件
        File newFile = new File(rootPath + File.separator + dateDirs + File.separator + newFileName);
        // 判断目标文件所在目录是否存在
        if( !newFile.getParentFile().exists()) {
            // 如果目标文件所在的目录不存在，则创建父目录
            newFile.getParentFile().mkdirs();
        }
        System.out.println(newFile);
        // 将内存中的数据写入磁盘
        file.transferTo(newFile);
        // 完整的url
        String fileUrl = date.get(Calendar.YEAR) + "/" + (date.get(Calendar.MONTH)+1) + "/" + newFileName;
        return  fileUrl;
    }
}