文件下载时的乱码问题:
1.关于下载时中文名称资源查找不到
原因:<a href='${pageContext.request.contextPath}/download?filename=天空.mp3'>天空.mp3</a>
这是get请求。
在服务器端:
String filename = request.getParameter("filename");
解决: new String(filename.getBytes("iso8859-1"),"utf-8");
2.下载文件显示时的中文乱码问题
response.setHeader("content-disposition", "attachment;filename="+filename);
IE:要求filename必须是utf-8码
firefox:要求filename必须是base64编码.
问题:怎样判断浏览器?
String agent=request.getHeader("user-agent");
if (agent.contains("MSIE")) {
// IE浏览器
filename = URLEncoder.encode(filename, "utf-8");
} else if (agent.contains("Firefox")) {
// 火狐浏览器
BASE64Encoder base64Encoder = new BASE64Encoder();
filename = "=?utf-8?B?"
+ base64Encoder.encode(filename.getBytes("utf-8"))
+ "?=";
}else {
// 其它浏览器
filename = URLEncoder.encode(filename, "utf-8");
处理IE浏览器与Firefox浏览器乱码问题
if (agent.contains("MSIE")) {
// IE浏览器
filename = URLEncoder.encode(filename, "utf-8");
filename = filename.replace("+", " ");
} else if (agent.contains("Firefox")) {
// 火狐浏览器
BASE64Encoder base64Encoder = new BASE64Encoder();
filename = "=?utf-8?B?"
+ base64Encoder.encode(filename.getBytes("utf-8"))
+ "?=";
} else if (agent.contains("Chrome")) {
// google浏览器
filename = URLEncoder.encode(filename, "utf-8");
} else {
// 其它浏览器
filename = URLEncoder.encode(filename, "utf-8");
}
package cn.learn.web.servlet;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
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 sun.misc.BASE64Encoder;
public class DownloadServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
// 1.得到要下载 的文件名称
String filename = request.getParameter("filename");
filename = new String(filename.getBytes("iso8859-1"), "utf-8");// 解决中文乱码
// 2.在d:/upload目录下查找这个文件是否存在
File file = new File("d:/upload/" + filename);
if (file.exists()) {
// /文件存在,完成下载
// 下载注意事项1--设置下载文件的mimeType
String mimeType = this.getServletContext().getMimeType(filename);
response.setContentType(mimeType);
String agent = request.getHeader("user-agent");
if (agent.contains("MSIE")) {
// IE浏览器
filename = URLEncoder.encode(filename, "utf-8");
} else if (agent.contains("Firefox")) {
// 火狐浏览器
BASE64Encoder base64Encoder = new BASE64Encoder();
filename = "=?utf-8?B?"
+ base64Encoder.encode(filename.getBytes("utf-8"))
+ "?=";
} else {
// 其它浏览器
filename = URLEncoder.encode(filename, "utf-8");
}
// 下载注意事项2--永远是下载
response.setHeader("content-disposition", "attachment;filename="
+ filename);
FileInputStream fis = new FileInputStream(file); // 读取要下载文件的内容
OutputStream os = response.getOutputStream(); // 将要下载的文件内容通过输出流写回到浏览器端.
int len = -1;
byte[] b = new byte[1024 * 100];
while ((len = fis.read(b)) != -1) {
os.write(b, 0, len);
os.flush();
}
os.close();
fis.close();
} else {
throw new RuntimeException("下载资源不存在.");
}
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}
}