Troubleshoot @ PathVariable for special character truncation

Overview:

@ResponseBody
 @RequestMapping(value="/download/{fileName:[a-zA-Z0-9\\.\\-\\_]+}", method = RequestMethod.GET)
 public void downloadAmr( HttpServletRequest request, HttpServletResponse response, @PathVariable("fileName") String fileName) {
 response.setContentType("application/octet-stream");
 String dir = System.getProperty("catalina.home"); // Obtain tomcat The working path in which  
 System.out.println("tomcat Path =" + dir); 
 // Object where the file is stored filedir.properties  File path  
 String dir2 = dir.substring(0, dir.length()) + File.separator +"webapps" + File.separator + "ROOT" + File.separator + fileName; 
 File file = new File(dir2);
 ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
 byte[] buffer = new byte[1024]; 
 int len; 
 try { 
 InputStream inputStream = new FileInputStream(file);
 while ((len = inputStream.read(buffer)) > -1 ) { 
 byteArrayOutputStream.write(buffer, 0, len); 
 } 
 byteArrayOutputStream.flush(); 
 response.getOutputStream().write(byteArrayOutputStream.toByteArray());
 } catch (FileNotFoundException e) {
 logger.error(" File read exception ", e);
 } catch (IOException e) { 
 logger.error(e.getMessage(), e); 
 } 
 logger.info(" Download and enter. . . . . . . . . . . . . . . . . ");
 }

Summary:

1. In the default case/download/{fileName}, then @ PathVariable ("fileName"),

If the path is/download/1. jpg, then fileName=1 instead of 1. jpg, the problem is that the character. _-correlation is truncated by default.

2. The solution is

{fileName:[a-zA-Z0-9\\.\\-\\_]+}

Use regular expressions to indicate that these characters cannot be truncated.

Supplement: Springboot uses @ PathVariable to pass parameters, and the last parameter will lose the part after the decimal point

When using @ PathVariable to pass the path parameter, it was magically found that the part behind the decimal point of the last 1-digit parameter was missing, as follows:

The Controller method is annotated as follows:

@RequestMapping(value = "/user/findPassword/{email}", method = RequestMethod.GET, produces="application/json")

I want to pass a mailbox here, and then I found that there is no mailbox suffix.

Confused, Baidu's solution is as follows:

@RequestMapping(value = "/user/findPassword/{email:.+}", method = RequestMethod.GET, produces="application/json")

Add a colon and a decimal point after the parameter and add a plus sign: {email:. +}