Java下載檔案時處理中文 使用URLEncoder編碼後 空格變+號的問題__Ajax

解決轉換空格 
String fileName = StringUtils.trim(file.getName()); 

String formatFileName = encodingFileName(name);//在後面定義方法encodingFileName(String fileName); 
response.setHeader("Content-Disposition", "attachment; filename=" + formatFileName ); 

//處理檔案名稱中出現的空格    

//其中%20是空格在UTF-8下的編碼 

public static String encodingFileName(String fileName) { 
        String returnFileName = ""; 
        try { 
            returnFileName = URLEncoder.encode(fileName, "UTF-8"); 
            returnFileName = StringUtils.replace(returnFileName, "+", "%20"); 
            if (returnFileName.length() > 150) { 
                returnFileName = new String(fileName.getBytes("GB2312"), "ISO8859-1"); 
                returnFileName = StringUtils.replace(returnFileName, " ", "%20"); 
            } 
        } catch (UnsupportedEncodingException e) { 
            e.printStackTrace(); 
            if (log.isWarnEnabled()) { 
                log.info("Don't support this encoding ..."); 
            } 
        } 
        return returnFileName; 

    } 

或者：

fileName = URLEncoder.encode(fileName, "utf-8")

fileName = fileName.Replace("+", "%20");  encode後替換  解決空格問題

response.addHeader("Content-Disposition", "attachment;filename=" + fileName, "utf-8");