JAVAWEB实训O2O商城Demo（二）——图片下载（乱码、中文等解决）

在Myeclipse里面BASE64Encoder不支持头文件，以下大佬链接有解决方案

https://blog.csdn.net/erlian1992/article/details/79518416

package com.xiaonuolen.downlandsServlet;

import java.io.FileInputStream;
import java.io.IOException;
import java.net.URLEncoder;

import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import sun.misc.BASE64Encoder;
/**
* Servlet implementation class DownServlet
*/
@WebServlet("/DownServlet")
public class DownServlet extends HttpServlet {
   protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
       /*************1.接受参数*************/
       String name = request.getParameter("filename");

       /*************2.对接收的参数进行编码处理也许你的代码会出现乱码问题所以这边要改我试过在jsp里面用utf-8发现没有什么问题
       //把乱码转换二进制
       byte[] bytes = name.getBytes("ISO8859-1");
       //再转换成UTF-8进行编码
       name = new String(bytes,"UTF-8");

       *************/
       /*************3.告诉游览器响应的文件类型*************/
       String mimeType = this.getServletContext().getMimeType(name);//获取类型
       response.setContentType(mimeType);//设置mimetype 设置类型


       /*************4.告诉游览器以附件形式下载并根据游览器进行转码*************/
       /*获取客户端信息*/
       String agent = request.getHeader("User-Agent");
       //定义一个变量记录编码后的名字
       String filenameEncoder = "";
       if(agent.contains("MSIE")) {
           //IE编码
           filenameEncoder = URLEncoder.encode(name,"utf-8");
           filenameEncoder = filenameEncoder.replace("+", " ");
       }
       else if(agent.contains("Firefox")) {
           //火狐编码
           BASE64Encoder base64Encoder = new BASE64Encoder();
           filenameEncoder = "=?utf-8?B?" + base64Encoder.encode(name.getBytes("utf-8")) + "?=";
       }
       else {
           //游览器编码
           filenameEncoder = URLEncoder.encode(name,"utf-8");
       }
       response.setHeader("Content-Disposition", "attachment;filename="+filenameEncoder);   //告诉游览器不要去解析，以附件形式下载

       /*************5.响应给游览器*************/
       String path = this.getServletContext().getRealPath("down/"+name);
       FileInputStream in = new FileInputStream(path);
       byte[] buffer=new byte[1024];
       int len = 0;
       ServletOutputStream out = response.getOutputStream();
       while((len=in.read(buffer))!=-1) {
           out.write(buffer,0,len);

       }


       in.close();

   }
   protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

   }

}

JAVAWEB实训O2O商城Demo（二）——图片下载（乱码、中文等解决）

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