Servlet实现下载图片到本地

import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.FileInputStream;
import java.io.IOException;
public class DownloadFileServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //1.下载路径
        String filePath = "D:\\Desktop\\工具箱\\图片素材\\imm.png";
        System.out.println("下载路径 = " + filePath);
        //获取文件名
        String fileName = filePath.substring(filePath.lastIndexOf("\\") + 1);
        resp.setHeader("Content-Disposition","attachment;filename="+fileName);
        //获取下载文件的输入流
        FileInputStream in = new FileInputStream(filePath);
        //创建缓冲区域
        int len = 0;
        byte[] buffer = new byte[1024];
        //获取输出流
        ServletOutputStream out = resp.getOutputStream();
        while ((len=in.read(buffer)) > 0){
            out.write(buffer,0,len);
        }
        in.close();
        out.close();
    }
}

    <servlet>
        <servlet-name>DownloadFileServlet</servlet-name>
        <servlet-class>com.xxx.servlet.DownloadFileServlet</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>DownloadFileServlet</servlet-name>
        <url-pattern>/download</url-pattern>
    </servlet-mapping>