java 下載檔案 && 下載檔名中文亂碼問題
阿新 • • 發佈:2019-02-18
package com.itheima.login;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.net.URLEncoder;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import sun.misc.BASE64Encoder;
public class ServletDownload extends HttpServlet {
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
//response.getWriter().append("Served at: ").append(request.getContextPath());
String filename = request.getParameter("filename");
//解決獲得中文引數的亂碼問題----
filename = new String(filename.getBytes("ISO8859-1"),"UTF-8");//美女.jpg
//獲得請求頭中的User-Agent
String agent = request.getHeader("User-Agent");
//根據不同瀏覽器進行不同的編碼
String filenameEncoder = "" ;
if (agent.contains("MSIE")) {
// IE瀏覽器
filenameEncoder = URLEncoder.encode(filename, "utf-8");
filenameEncoder = filenameEncoder.replace("+", " ");
} else if (agent.contains("Firefox")) {
// 火狐瀏覽器
BASE64Encoder base64Encoder = new BASE64Encoder();
filenameEncoder = "=?utf-8?B?"
+ base64Encoder.encode(filename.getBytes("utf-8")) + "?=";
} else {
// 其它瀏覽器
filenameEncoder = URLEncoder.encode(filename, "utf-8");
}
//System.out.println(filename);
//要下載的檔案型別----客戶端通過檔案的MINE型別區分型別
String mimeType = this.getServletContext().getMimeType(filename);
response.setContentType(mimeType);
//告訴客戶端該檔案不是直接解析而是以附件形式開啟(下載)
response.setHeader("Content-Disposition", "attachment;filename="+filenameEncoder);
//獲取檔案的絕對路徑
String filePath = this.getServletContext().getRealPath(filename);
ServletOutputStream outputStream = response.getOutputStream();
FileInputStream in = new FileInputStream(filePath);
byte[] buffer = new byte[1024];
int len = 0;
while ((len = in.read(buffer)) > 0) {
outputStream.write(buffer);
}
in.close();
}
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
//doGet(request, response);
}
}