文件下载
程序员文章站
2022-06-20 08:58:56
...
/**
* 下载文件
*/
public ActionForward downLoad(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
throws Exception {
String destPathName = servlet.getServletContext().getRealPath("/");
response.reset();
String fileName = request.getParameter("fileName");
String filePath = request.getParameter("filePath");
filePath = destPathName + "/" + filePath;
int index = fileName.lastIndexOf(".");
String savename = fileName.substring(0, index);
String hz = fileName.substring(index + 1, fileName.length());
// response.setCharacterEncoding("GBK");
//response.setContentType("application/OCTET-STREAM");
//不禁用页面缓存,使文件可以直接打开
response.setHeader("Pragma", "");
response.setHeader("Cache-Control", "");
response.setContentType("application/x-msdownload");
// response.setContentType("application/ms-excel;charset=GBK");
response.setHeader("Content-Disposition", "attachment; filename=\""
+ toUtf8String(savename) + "." + hz);
ServletOutputStream sos = response.getOutputStream();
InputStream is = new java.io.FileInputStream(filePath);
int i = 0;
while ((i = is.read()) != -1) {
sos.write(i);
}
is.close();
sos.close();
sos.flush();
return null;
}
// toUtf8String()对中文进行转换
// 下载为中文名不会出现乱码
private String toUtf8String(String s) {
StringBuffer sb = new StringBuffer();
for (int i = 0; i < s.length(); i++) {
char c = s.charAt(i);
if (c >= 0 && c <= 255) {
sb.append(c);
} else {
byte[] b;
try {
b = Character.toString(c).getBytes("utf-8");
} catch (Exception ex) {
System.out.println(ex);
b = new byte[0];
}
for (int j = 0; j < b.length; j++) {
int k = b[j];
if (k < 0)
k += 256;
sb.append("%" + Integer.toHexString(k).toUpperCase());
}
}
}
return sb.toString();
}
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