2016/11/4

What I learned today

• SPRINGMVC form validation based on Hibernate validator:

http://blog.csdn.net/wuyt2008/article/details/8597312

Summary of steps:

1. Add dependencies to the Pom file
2. Add the appropriate annotations on the bean that needs to be validated

The following annotations are available:

　　@NotEmpty

　　@NotBlank (message= "property cannot be empty")

　　@Size (min= 3, max= , message= "property length only between 3-20")

　　@Pattern (regexp = "^[a-za-z_][a-za-z_0-9]*$", message= "user name is malformed") //Regular expression

　　@Email (message= "mailbox format is incorrect")　　

1. Add @valid annotations to the bean on which the controller accepts parameters
2. Add a property modelattribute="BEAN" to the previous paragraph submission form form

• Four meta-note links in Java: http://www.cnblogs.com/Gordon-YangYiBao/archive/2012/08/07/2626340.html

[Email protected]: The purpose of the annotations

Format:

@Target (Type,field,method,parameter,constructor,local_variable,annotation_type,package)

Range:

Type: Interface, class, enumeration, annotation

Field: Constants for fields, enumerations

Method: Methods

PARAMETER: Method Parameters

CONSTRUCTOR: Constructors

local_variable: Local Variables

Annotation_type: Annotations

Package: Packages

[Email protected]: Where to leave annotations

Format @retention (Retentionpolicy.source)

Range:

Source: Annotations exist only in the source code and are not included in the class bytecode file

Class: Default retention policy, annotations exist in the class bytecode file, but are not available at runtime

Runtime: Annotations exist in the class bytecode file and can be retrieved at run time through reflection

　　

2016/11/4