February 2017 first half month logbook

First, image upload

Accept attributes for HTML <input> tags
Using the Accept attribute in file uploads, the input fields in this example can accept GIF and JPEG two images:
<input type= "file" name= "pic" id= "pic" accept= "image/gif, Image/jpeg"/>
If you do not restrict the format of the image, it can be written as: accept= "image/*". The Accept property can only be used with <input type= "file" >. It specifies the types of files that can be submitted through file uploads.
HTML 5 <input> Type attribute: http://www.w3school.com.cn/html5/att_input_type.asp

Image upload plugin for uploading, previewing and zooming images.

Cropit plug-in: http://scottcheng.github.io/cropit/

FileInputStream is used to read raw byte streams such as image data. To read a character stream, consider using FileReader.
byte data[] = new Byte[length]:length The maximum should be integer.maxvalue, that is, the 2147483647,int data is the largest 2^31-1. Second, the Ajax Foundation

(Default: Automatically determine (XML or HTML) the call time when a request fails.
the//parameter has the following three: XMLHttpRequest object, error message, and (optionally) the error object captured.
//If an error occurs, the error message (the second parameter), in addition to the NULL,
//may also be "timeout", "error", "Notmodified", and "ParserError".
//textstatus: "Timeout", "error", "Notmodified" and "ParserError".
error:function (XMLHttpRequest, Textstatus, Errorthrown) { 
  

Third, the CSS Foundation

Display:flex;
Align-items:center;
Achieve effect: Vertical centering Four, Java Foundation

5 ways to print an array in Java

    Arrays.tostring (arr)  
      
    for (int n:arr)   
       System.out.println (n+ ",");  
      
    for (int i = 0; i < arr.length; i++) {  
       System.out.print (Arr[i] + ",");  
    }  
      
    System.out.println (Arrays.aslist (arr));  
      
    

Retainall method de-Weight: object cannot be implemented, and conversion to string can be implemented.

public static void Main (string[] args) {
	set<object> list1 = new hashset<object> ();
	List1.add (jsonarray.tojsonstring (New Accountentity ("Lily"));
	List1.add (jsonarray.tojsonstring (New Accountentity ("Jim"));
	List1.add (jsonarray.tojsonstring (New Accountentity ("Tom"));
	
	set<object> list2 = new hashset<object> ();
	List2.add (jsonarray.tojsonstring (New Accountentity ("Tom"));
	List2.add (jsonarray.tojsonstring (New Accountentity ("Tony"));
	List2.add (jsonarray.tojsonstring (New Accountentity ("Lily"));
	
	List1.retainall (LIST2);
	Iterator<object> it = List1.iterator ();
	while (It.hasnext ()) {
		System.out.println (It.next ());
	}
}