![\"\"](\"/images/csdn/1545358537154o5a3sZ58537.png\")
DownloadServlet:
package com.yuming.servlet;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URLEncoder;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.yuming.util. 64Util;
/**
* Servlet implementation class DownloadServlet
*/
public class DownloadServlet extends HttpServlet {
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//1. 获取要下载的文件名字 aa.jpg --- inputStream
String fileName = request.getParameter(\"filename\");
//get请求,这个fileName有中文
fileName = new String(fileName.getBytes(\"UTF-8\"),\"UTF-8\");
System.out.println(\"fileName=\"+fileName);
//2. 获取这个文件在tomcat里面的绝对路径地址
String path = getServletContext().getRealPath(\"download/\"+fileName);
/**
* 如果文件的名字带有中文,需要对文件名进行编码处理
*
* IE/chrome 使用URLEncoding编码
*
* Firefox ,使用 64 编码
*/
String clientType = request.getHeader(\"User-Agent\");
if(clientType.contains(\"Firefox\")){
fileName = 64Util. 64EncodeFileName(fileName);
}else{
//IE ，或者 Chrome （谷歌浏览器） ，
//对中文的名字进行编码处理
fileName = URLEncoder.encode(fileName, \"UTF-8\");
}
//让浏览器收到这份资源的时候， 以下载的方式提醒用户，而不是直接展示。
response.setHeader(\"Content-Disposition\", \"attachment; filename=\"+fileName);
// response.setStatus(302);
// response.setHeader(Location, \"login_success.html\");
//
//response.sendRedirect(\"login_success.html\");
//3. 转化成输入流
InputStream is = new FileInputStream(path);
OutputStream os = response.getOutputStream();
int len = 0 ;
byte[]buffer = new byte[1024];
while( (len = is.read(buffer)) != -1){
os.write(buffer, 0, len);
}
os.close();
is.close();
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
}
64Util:
package com.yuming.util;
import java.io.UnsupportedEncodingException;
import sun.misc. 64Encoder;
public class 64Util {
public static String 64EncodeFileName(String fileName) {
64Encoder 64Encoder = new 64Encoder();
try {
return \"=?UTF-8?B?\"
+ new String( 64Encoder.encode(fileName
.getBytes(\"UTF-8\"))) + \"?=\";
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
throw new RuntimeException(e);
}
}
}
web. :
<? version=\"1.0\" encoding=\"UTF-8\"?>
<web-app ns:xsi=\"http://www.w3.org/2001/ Schema-instance\"
ns=\"http://java.sun.com/ /ns/javaee\"
xsi:schemaLocation=\"http://java.sun.com/ /ns/javaee http://java.sun.com/ /ns/javaee/web-app_2_5.xsd\"
id=\"WebApp_ID\" version=\"2.5\">
<display-name>Download</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
<servlet>
<de ion></de ion>
<display-name>DownloadServlet</display-name>
<servlet-name>DownloadServlet</servlet-name>
<servlet-class>com.yuming.servlet.DownloadServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>DownloadServlet</servlet-name>
<url-pattern>/DownloadServlet</url-pattern>
</servlet-mapping>
</web-app>
download.html:
<!DOCTYPE html>
<html>
<head>
< charset=\"UTF-8\">
< >Insert here</ >
</head>
<body>
<h2>tomcat默认servlet提供下载</h2>
<a href=\"download/aa.jpg\">aa.jpg</a><br />
<a href=\"download/bb.txt\">bb.txt</a><br />
<a href=\"download/cc.rar\">cc.rar</a><br />
<br>手动编码提供下载。:<br>
<a href=\"DownloadServlet?filename=aa.jpg\">aa.jpg</a><br>
<a href=\"DownloadServlet?filename=bb.txt\">bb.txt</a><br>
<a href=\"DownloadServlet?filename=cc.rar\">cc.rar</a><br>
<a href=\"DownloadServlet?filename=大海.jpg\">大海.jpg</a><br>
</body>
</html>
谷歌,火狐都可以下载哟...
有个问题,求解
![\"\"](\"/images/csdn/1545358537154y5jc3M58537.png\")
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