java工具类下载_java文件下载工具类

/**

* Desc:下载工具类

* @date 2014-6-26

*/

public class DownLoadUtil {

/**

* Desc:根据文件头判断请求来自的浏览器，以便有针对性的对文件名转码

* @date 2014-6-26

* @param request

* @return

* @throws Exception

*/

public static String transFileName(String fileName, HttpServletRequest request) {

String agent = request.getHeader("USER-AGENT");

//fileName = fileName.trim();//去首尾空格

try {

//根据文件头判断请求来自的浏览器，以便有针对性的对文件名转码

if(null != agent && -1 != agent.indexOf("theworld")){//世界之窗

fileName = new String(fileName.getBytes("gb2312"), "ISO8859-1"); //解决下载的文件名中含有小括号转变义符%28%29

}else if(null != agent && -1 != agent.indexOf("MSIE 8.0")){//IE8

String lenFileName = URLEncoder.encode(fileName, "UTF-8");

if (lenFileName.length() > 150) {//文件名长度是否大于150个字符

fileName = new String(fileName.getBytes("gb2312"), "ISO8859-1");

} else {

fileName = URLEncoder.encode(fileName,"UTF-8").replace("+","%20");

}

}else if(null != agent && -1 != agent.indexOf("MSIE 7.0") && -1 != agent.indexOf("SE 2.X MetaSr 1.0")){//sogo浏览器

fileName = URLEncoder.encode(fileName,"UTF-8").replace("+","%20");

}else if(null != agent && (-1 != agent.indexOf("SV1") || -1 != agent.indexOf("360SE"))){//360安全浏览器

String lenFileName = URLEncoder.encode(fileName, "UTF-8");

if (lenFileName.length() > 150) {//文件名长度是否大于150个字符

fileName = new String(fileName.getBytes("gb2312"), "ISO8859-1");

} else {

fileName = URLEncoder.encode(fileName,"UTF-8").replace("+","%20");

}

}else if(null != agent && -1 != agent.indexOf("Chrome")){//google

fileName = new String(fileName.getBytes("gb2312"), "ISO8859-1"); //解决下载的文件名中含有小括号转变义符%28%29

}else if(null != agent && -1 != agent.indexOf("Firefox")){//Firefox

fileName = new String(fileName.getBytes("gb2312"), "ISO8859-1");

}else if(null != agent && -1 != agent.indexOf("Safari")){//Firefox

fileName = new String(fileName.getBytes("UTF-8"), "ISO8859-1");

}else {//其它浏览器

fileName = new String(fileName.getBytes("gb2312"), "ISO8859-1");

}

} catch (Exception e) {

throw new RuntimeException("transFileName error", e);

}

return fileName;

}

}

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