前端代碼
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<h1>使用a标簽直接指向伺服器上的資源</h1>
<a href="/WEB14/download/a.flv" target="_blank" rel="external nofollow" >a.flv</a><br>
<a href="/WEB14/download/a.jpg" target="_blank" rel="external nofollow" >a.jpg</a><br>
<a href="/WEB14/download/a.mp3" target="_blank" rel="external nofollow" >a.mp3</a><br>
<a href="/WEB14/download/a.mp4" target="_blank" rel="external nofollow" >a.mp4</a><br>
<a href="/WEB14/download/a.txt" target="_blank" rel="external nofollow" >a.txt</a><br>
<a href="/WEB14/download/a.zip" target="_blank" rel="external nofollow" >a.zip</a><br>
<h1>使用伺服器端編碼的方式實作檔案下載下傳</h1>
<a href="/WEB14/downloadServlet?filename=a.flv" target="_blank" rel="external nofollow" >a.flv</a><br>
<a href="/WEB14/downloadServlet?filename=a.jpg" target="_blank" rel="external nofollow" >a.jpg</a><br>
<a href="/WEB14/downloadServlet?filename=a.mp3" target="_blank" rel="external nofollow" >a.mp3</a><br>
<a href="/WEB14/downloadServlet?filename=a.mp4" target="_blank" rel="external nofollow" >a.mp4</a><br>
<a href="/WEB14/downloadServlet?filename=a.txt" target="_blank" rel="external nofollow" >a.txt</a><br>
<a href="/WEB14/downloadServlet?filename=a.zip" target="_blank" rel="external nofollow" >a.zip</a><br>
<a href="/WEB14/downLoadServlet2?filename=美女.jpg" target="_blank" rel="external nofollow" >美女.jpg</a><br>
</body>
</html>
後端servlet代碼（當檔案名出現中文是需要進行處理）
1.将擷取的中文亂碼名字轉換指點編碼
2.設定對應的浏覽器編碼，代碼如下：
package com.itheima.content;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
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 DownLoadServlet2 extends HttpServlet {
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
//*******檔案名稱是中文的下載下傳*******
//獲得要下載下傳的檔案的名稱
String filename = request.getParameter("filename");//????.jpg
//解決獲得中文參數的亂碼
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");
//根據不同浏覽器進行不同的編碼
String filenameEncoder = "";
if (agent.contains("MSIE")) {
// IE浏覽器
filenameEncoder = URLEncoder.encode(filename, "utf-8");
filenameEncoder = filenameEncoder.replace("+", " ");
} else if (agent.contains("Firefox")) {
// 火狐浏覽器
BASE64Encoder base64Encoder = new BASE64Encoder();
filenameEncoder = "=?utf-8?B?"
+ base64Encoder.encode(filename.getBytes("utf-8")) + "?=";
} else {
// 其它浏覽器
filenameEncoder = URLEncoder.encode(filename, "utf-8");
}
//要下載下傳的這個檔案的類型-----用戶端通過檔案的MIME類型去區分類型
response.setContentType(this.getServletContext().getMimeType(filename));
//告訴用戶端該檔案不是直接解析 而是以附件形式打開(下載下傳)----filename="+filename 用戶端預設對名字進行解碼
response.setHeader("Content-Disposition", "attachment;filename="+filenameEncoder);
//擷取檔案的絕對路徑
String path = this.getServletContext().getRealPath("download/"+filename);
//獲得該檔案的輸入流
InputStream in = new FileInputStream(path);
//獲得輸出流---通過response獲得的輸出流 用于向用戶端寫内容
ServletOutputStream out = response.getOutputStream();
//檔案拷貝的模闆代碼
int len = 0;
byte[] buffer = new byte[1024];
while((len=in.read(buffer))>0){
out.write(buffer, 0, len);
}
in.close();
//out.close();
}
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}
}
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