Java I/O stream code to read images for front-end display sharing

Recently, in the project, we need to use IO stream to read images for front-end page display. Since we have always used URL paths for image display, when we heard that the project needs to use IO stream to read images, it felt very complex. But the task has been assigned, and as a programmer, we only have to choose to execute it. So, I found some materials and looked at the api for a while,

Hey, it feels quite simple, as this is the first time using IO stream to read an image for page display, so let's record the following code

Backend code:

/** 
   * IO stream reading image by:long 
   * @return 
   */
@RequestMapping(value = "/IoReadImage/{imgName}", method = RequestMethod.GET) 
  public String IoReadImage(@PathVariable String imgName,HttpServletRequest request,HttpServletResponse response) throws IOException {
	ServletOutputStream out = null;
	FileInputStream ips = null;
	try {
		//Get the image storage path 
		String imgPath = Constants.FOLDER_IMAGE + imgName;
		ips = new FileInputStream(new File(imgPath));
		response.setContentType("multipart/form-data");
		out = response.getOutputStream();
		//Read file stream 
		int len = 0;
		byte[] buffer = new byte[1024 * 10);
		while ((len = ips.read(buffer)) != -1{
			out.write(buffer,0,len);
		}
		out.flush();
	}
	catch (Exception e){
		e.printStackTrace();
	}
	finally {
		out.close();
		ips.close();
	}
	return null;
}

Front-end code - Method 1:

<span style="white-space:pre;"> </<span><div style="float: left;"> 
     <#--${model.userDatil.photo} is the file name stored in the database--> 
     <img src="${ctx}/userInfo/IoReadImage/${model.userDatil.photo}" id="npcImg" width="125" height="148/> 
     <input type="hidden" id="photo" name="photo"/> 
    </div> 

js code - Method 2:

var npcName = $('#npcImg').data('val'); 
var img = document.getElementById("npcImg"); 
img.src = '/userInfo/IoReadImage/+npcName; 

jQuery code - Method 3:

$('#npcImg').attr('src','/userInfo/IoReadImage/+npcName); 

That's it, the image can be displayed on the front-end, only a few lines of code, no additional comments are explained

Summary

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