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Java 文件下载功能解决中文乱码

2018-01-03 11:20 465 查看

Html部分

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<a href="http://localhost:8080/webdemojava/download1?filename=a.flv" class="downloadbtn">a.flv</a>
<a href="http://localhost:8080/webdemojava/download1?filename=a.jpg" class="downloadbtn">a.jpg</a>
<a href="http://localhost:8080/webdemojava/download1?filename=a.mp3" class="downloadbtn">a.mp3</a>
<a href="http://localhost:8080/webdemojava/download1?filename=a.mp4" class="downloadbtn">a.mp4</a>
<a href="http://localhost:8080/webdemojava/download1?filename=a.txt" class="downloadbtn">a.txt</a>
<a href="http://localhost:8080/webdemojava/download1?filename=a.z1ip" class="downloadbtn">a.z1ip</a>
</body>

</html>

Java代码

package action;

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 org.apache.jasper.tagplugins.jstl.core.Out;

import sun.misc.BASE64Encoder;

public class DownLoad1 extends HttpServlet {
private static final long serialVersionUID = 1L;

public DownLoad1() {
super();
// TODO Auto-generated constructor stub
}

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

String filename = request.getParameter("filename"); //获取发送过来的文件名
filename = new String(filename.getBytes("ISO8859-1"),"UTF-8"); //解决传过来的文件名是中文.会变乱码的问题

//获得请求头中的 User-Agent
String agent = request.getHeader("User-Agent");
//根据不同的客户的 进行不同的编码 .解决下载的文件 中文 没名字
String filenameEncoder = "";
if (agent.contains("MSIE")) {
// IE浏览器
filenameEncoder = URLEncoder.encode(filename, "utf-8");
filenameEncoder = filenameEncoder.replace("+", " ");
} else if (agent.contains("Firefox")) {
// 火狐浏览器
BASE64Encoder base64Encoder = new BASE64Encoder();
filenameEncoder = "=?utf-8?B?"
+ base64Encoder.encode(filename.getBytes("utf-8")) + "?=";
} else {
// 其它浏览器
filenameEncoder = URLEncoder.encode(filename, "utf-8");
}

String realPath = this.getServletContext().getRealPath("/download/"+filename); //相对路径变绝对路径
InputStream in = null;
try {
in = new FileInputStream(realPath); //读到要下载的文件.并做检测文件是否存在
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
if (in == null) {
response.setContentType("text/html;charset=UTF-8");
response.getWriter().append("没有找到该文件");
return;
}

ServletOutputStream out = response.getOutputStream();
response.setContentType(this.getServletContext().getMimeType(filename)); //设置返回的文件类型
response.setHeader("Content-Disposition", "attachment;filename="+filenameEncoder); //告诉客户的文件以附件类型打开(下载)

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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