servlet - 从本地下载图片

import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.PrintWriter;

public class FileServlet extends HelloServlet {
    /*由于get或者post只是请求实现的不同的方式，可以相互调用，业务逻辑都一样*/
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //1.获取下载文件的路径
        String realPath = "G:\\JavaWeb学习\\javaweb-servlet2\\servlet2.1\\target\\classes\\img\\照片.jpg";
        //G:\JavaWeb学习\javaweb-servlet2\servlet2.1\target\classes\img\照片.jpg
        System.out.println("下载文件的路径："+realPath);
        //2.下载文件名是啥？
        String fileName = realPath.substring(realPath.lastIndexOf("\\") + 1);
        //3.设置想办法让浏览器能够支持下载我们需要的东西
        resp.setHeader("Content-Disposition","attachment;filename"+fileName);
        //4.获取下载文件的输入流
        FileInputStream inputStream = new FileInputStream(realPath);
        //5创建缓冲区
        int len = 0;
        byte[] buffer = new byte[1024];
        //6.获取OutputStream对象
        ServletOutputStream out = resp.getOutputStream();
        //7.将FileInputStream流写入到buffer缓冲区
        while ((len=inputStream.read(buffer))>0){
            out.write(buffer,0,len);
        }
        //8.使用OutputStream将缓冲区中的数据输出到客户端！
        inputStream.close();
        out.close();
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req, resp);
    }
}