springmvc文件下载之文件名下划线问题终极解决方案

@RequestMapping("download")
publicStringdownload(ModelMapmodel,@ModelAttribute("e")Templatet,HttpServletResponseresponse,HttpServletRequestrequest)throwsException{
Accountacc=getLoginAccount();　　　
if(acc==null||StringUtils.isBlank(acc.getAccount())){
return("/account/login");
}

StringfileUrl=template.getFileUrl();　　　／／ｕｒｌ　路径，　如　http://×××××/×××/××××/image/20170525/中文.jpg
Stringfilename=fileUrl.substring(fileUrl.lastIndexOf("/")+1);　　／／截取最后的文件名　　－＞　中文．ｊｐｇ
filename=processFileName(request,filename);
BufferedOutputStreambf=null;
try{
response.setHeader("Content-disposition","attachment;filename="+filename);
bf=newBufferedOutputStream(response.getOutputStream());
bf.write(this.httpConverBytes(fileUrl,request));
｝．．．．

重要的　ｐｒｏｃｅｓｓＦｉｌｅＮａｍｅ方法。

publicstaticStringprocessFileName(HttpServletRequestrequest,StringfileNames){
Stringcodedfilename=null;
try{
Stringagent=request.getHeader("USER-AGENT");
if(null!=agent&&-1!=agent.indexOf("MSIE")||null!=agent
&&-1!=agent.indexOf("Trident")){//ie
Stringname=java.net.URLEncoder.encode(fileNames,"UTF8");
codedfilename=name;
}elseif(null!=agent&&-1!=agent.indexOf("Mozilla")){//火狐,chrome等
codedfilename=newString(fileNames.getBytes("UTF-8"),"iso-8859-1");
}
}catch(Exceptione){
e.printStackTrace();
}
returncodedfilename;
}

／／ｈｔｔｐＣｏｎｖｅｒＢｙｔｅｓ　方法

publicstaticbyte[]httpConverBytes(Stringpath,HttpServletRequestrequest){
BufferedInputStreamin=null;
ByteArrayOutputStreamout=null;
URLConnectionconn=null;
inthttpResult=0;
try{
StringBuffersb=newStringBuffer();
for(inti=0;i<path.length();i++){
chara=path.charAt(i);　　　／／ｕｒｌ路径的中文部分重新编码　很重要
if(a>127){//将中文UTF-8编码
sb.append(URLEncoder.encode(String.valueOf(a),"utf-8"));
}else{
sb.append(String.valueOf(a));
}
}
URLurl=newURL(sb.toString());//创建URL
URLConnectionurlconn=url.openConnection();//试图连接并取得返回状态码urlconn.connect();
HttpURLConnectionhttpconn=(HttpURLConnection)urlconn;
httpResult=httpconn.getResponseCode();
in=newBufferedInputStream(httpconn.getInputStream());

if(httpResult!=HttpURLConnection.HTTP_OK){//不等于HTTP_OK说明连接不成功
System.out.print("连接失败！");
}else{
out=newByteArrayOutputStream(1024);
byte[]temp=newbyte[1024];
intsize=0;
while((size=in.read(temp))!=-1){
out.write(temp,0,size);
}
byte[]content=out.toByteArray();
returncontent;
}
}catch(Exceptione){
e.printStackTrace();
}
finally{
try{
in.close();
}catch(IOExceptione){
e.printStackTrace();
}
try{
out.close();
}catch(IOExceptione){
e.printStackTrace();
}
}
returnnull;
}

通过以上处理下划线问题解决了。