Jsp-el-expression

First, El syntax and use

EL (Expression Language) is designed to make jsps easier to write.

1. Grammatical structure

${the Name property value of the domain object}

2, the Value method

Take value from small to large: page, request, session, application

If it is found, it will continue to look up if it is not found, and if it is not found, an empty string is displayed application

You can set the corresponding domain range (pagescope, Requestscope, Sessionscope, applicationscope) If you need to take a value that is scoped to the specified domain

3. Attention

The EL expression generally operates only on domain objects and cannot manipulate variables.

Second, El get parameters

　　

Third, el-entity class

　　

Iv. el-list Container

　　

V. Collection of El-map

Vi.. El operation

1, two non-existent domain objects (numeric type) added, with a value of 0

　　　　

2, a existence (numeric type), a non-existent sum, the value of the existence of the

　　　　

3, non-numeric type of string addition, will be error

　　　　

　　

Jsp-el-expression