代码（仅供参考）：
1 /* 2 * 另存为 3 */ 4 @RequestMapping("/saveAs.do") 5 public @ResponseBody void saveAs(String filePath,String fileName){ 6 7 try { 8 File file=new File(filePath); 9 //设置文件MIME类型 10 getResponse().setContentType(getMIMEType(file)); 11 //设置Content-Disposition 12 getResponse().setHeader("Content-Disposition", "attachment;filename="+URLEncoder.encode(fileName, "UTF-8")); //此处可以重命名 13 //获取目标文件的绝对路径 14 String fullFileName = getRealPath("/upload/"+filePath); 15 //System.out.println(fullFileName); 16 //读取文件 17 InputStream in = new FileInputStream(fullFileName); 18 //读取目标文件，通过response将目标文件写到客户端 19 OutputStream out = getResponse().getOutputStream(); 20 //写文件 21 int b; 22 while((b=in.read())!= -1) 23 { 24 out.write(b); 25 } 26 in.close(); 27 out.close(); 28 } catch (Exception e) { 29 e.printStackTrace(); 30 } 31 } 32 33 /** 34 * 根据文件后缀名获得对应的MIME类型。 35 * 36 * @param file 37 */ 38 private String getMIMEType(File file) { 39 String type = "*/*"; 40 String fName = file.getName(); 41 // 获取后缀名前的分隔符"."在fName中的位置。 42 int dotIndex = fName.lastIndexOf("."); 43 if (dotIndex < 0) { 44 return type; 45 } 46 /* 获取文件的后缀名 */ 47 String end = fName.substring(dotIndex, fName.length()).toLowerCase(); 48 if (end == "") 49 return type; 50 // 在MIME和文件类型的匹配表中找到对应的MIME类型。 51 for (int i = 0; i < MIME_MapTable.length; i++) { 52 if (end.equals(MIME_MapTable[i][0])) 53 type = MIME_MapTable[i][1]; 54 } 55 return type; 56 } 57 58 59 private final String[][] MIME_MapTable = { 60 // {后缀名， MIME类型} 61 { ".doc", "application/msword" }, 62 { ".docx", 63 "application/vnd.openxmlformats-officedocument.wordprocessingml.document" }, 64 { ".xls", "application/vnd.ms-excel" }, 65 { ".xlsx", 66 "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet" }, 67 { ".pdf", "application/pdf" }, 68 { ".ppt", "application/vnd.ms-powerpoint" }, 69 { ".pptx", 70 "application/vnd.openxmlformats-officedocument.presentationml.presentation" }, 71 { ".txt", "text/plain" }, { ".wps", "application/vnd.ms-works" }, 72 { "", "*/*" } }; 73 74
效果：
Chrome
360IE
