request.getRealPath的替代方法

在写上传小练习的时候,发现获得路径的request.getRealPath("")已经被画上线了,也就是不再建议使用.

package controller;

import javax.servlet.http.HttpServletRequest;

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

@Controller
public class UploadController {
    @RequestMapping("upload.do")
    public String upload(HttpServletRequest request, String userName,
            @RequestParam(value = "file") MultipartFile file) {
        String upload_path1 = request.getRealPath("upload");

        System.out.println(upload_path1);
        return "index";

    }
}

虽然最后也能得到正确的结果,D:\Program Files\apache-tomcat-8.5.24\webapps\upload\upload

但是既然已经不再建议使用,那就要在以后的项目里避免使用,这里给出两个替代的方法:

String upload_path2 = request.getServletContext().getRealPath("upload");

String upload_path = request.getSession().getServletContext().getRealPath("upload");

输出结果相同: