springmvc文件下載之文件名下劃線問題終極解決方案

直接上代碼：Ａｃｔｉｏｎ中代碼片斷。

@RequestMapping("download")
public String download(ModelMap model, @ModelAttribute("e") Template t, HttpServletResponse response, HttpServletRequest request) throws Exception {
 Account acc = getLoginAccount();　　　
 if(acc==null || StringUtils.isBlank(acc.getAccount())){
 return ("/account/login");
 }

String fileUrl = template.getFileUrl();　　　／／ｕｒｌ　路徑，　如　http://×××××/×××/××××/image/20170525/中文.jpg
String  filename = fileUrl.substring(fileUrl.lastIndexOf("/")+1);　　／／截取最後的文件名　　－＞　中文．ｊｐｇ
filename = processFileName( request, filename);
BufferedOutputStream bf = null;
try {
 response.setHeader("Content-disposition", "attachment; filename = " + filename);
 bf = new BufferedOutputStream(response.getOutputStream());
 bf.write(this.httpConverBytes(fileUrl,request));
｝．．．．


重要的　ｐｒｏｃｅｓｓＦｉｌｅＮａｍｅ方法。

public static String processFileName(HttpServletRequest request, String fileNames) {
   String codedfilename = null;
 try {
 String agent = request.getHeader("USER-AGENT");
 if (null != agent && -1 != agent.indexOf("MSIE") || null != agent
 && -1 != agent.indexOf("Trident")) {// ie
 String name = java.net.URLEncoder.encode(fileNames, "UTF8");
 codedfilename = name;
 } else if (null != agent && -1 != agent.indexOf("Mozilla")) {// 火狐,chrome等
 codedfilename = new String(fileNames.getBytes("UTF-8"), "iso-8859-1");
 }
 } catch (Exception e) {
 e.printStackTrace();
 }
 return codedfilename;
}

／／ｈｔｔｐＣｏｎｖｅｒＢｙｔｅｓ　方法

public static byte[] httpConverBytes(String path,HttpServletRequest request) {
   BufferedInputStream in = null;
 ByteArrayOutputStream out = null;
 URLConnection conn = null;
 int httpResult=0;
 try {
 StringBuffer sb = new StringBuffer();
 for(int i=0;i<path.length();i++){
 char a=path.charAt(i);　　　／／ｕｒｌ路徑的中文部分從新編碼　很重要
 if(a>127){//將中文UTF-8編碼
 sb.append(URLEncoder.encode(String.valueOf(a), "utf-8"));
 }else{
 sb.append(String.valueOf(a));
 }
 }
 URL url = new URL(sb.toString()); //建立URL
 URLConnection urlconn = url.openConnection(); // 試圖鏈接並取得返回狀態碼urlconn.connect(); 
 HttpURLConnection httpconn = (HttpURLConnection) urlconn;
 httpResult = httpconn.getResponseCode();
 in = new BufferedInputStream(httpconn.getInputStream());

 if (httpResult != HttpURLConnection.HTTP_OK){ //不等於HTTP_OK說明鏈接不成功
 System.out.print("鏈接失敗！");
 }else {
 out = new ByteArrayOutputStream(1024);
 byte[] temp = new byte[1024];
 int size = 0;
 while ((size = in.read(temp)) != -1) {
 out.write(temp, 0, size);
 }
 byte[] content = out.toByteArray();
 return content;
 }
 } catch (Exception e) {
 e.printStackTrace();
 }
 finally {
 try {
 in.close();
 } catch (IOException e) {
 e.printStackTrace();
 }
 try {
 out.close();
 } catch (IOException e) {
 e.printStackTrace();
 }
 }
 return null;
}


經過以上處理下劃線問題解決了。