What aspects does velocity syntax include?

Velocity syntax includes: 1. Script instructions, Velocity uses the "#" symbol to identify script instructions; 2. Variable references, Velocity uses the "" symbol to identify variable references; 3. Loop structures, Velocity supports loop structures ; 4. Function call, Velocity supports calling Java methods or custom methods; 5. Import and export, Velocity supports import and export templates.

Velocity is a Java-based template engine that allows anyone to simply use the template language to reference objects defined by Java code. As a relatively complete template engine, Velocity's functions are relatively powerful, but its power also increases application complexity.

The basic syntax of Velocity includes the following aspects:

1. Script instructions: Velocity uses the "#" symbol to identify script instructions, for example:

   • #set: used to set variable values, for example: #set(name="Zhang San")
   • #if: used for conditional judgment, for example: #if(age > 18) Adult #else Minor#end
   • #else: Else branch used to express conditional judgment, for example: #if(age > 18) Adult#else #end
   • #end: Indicates the end of the script instruction, for example: #if(age > 18) Adult #else Minor #end

2. Variable reference: Velocity is identified by the "" symbol Variable reference, for example:

   • ${name}: refers to the variable named "name"
   • ${age}: refers to the variable named "age"

3. Loop structure: Velocity supports loop structures, such as:

   • #foreach: used to traverse arrays or collections, such as: #foreach(item in list) item : ${item} #end
   • #end: Indicates the end of the loop structure

4. Function call: Velocity supports calling Java methods or custom methods, such as :

   • #parse: used to parse template strings, for example: #parse("Hello, ${name}!")
   • #macro: used to define macros, for example : #macro(greeting, name) Hello, ${name}! #end

5. Import and export: Velocity supports import and export templates, for example:

   • #iinclude: used to import other templates, for example: #iinclude("header.vm")
   • #parse: used to parse template strings, for example: #parse("footer.vm")

The above is an introduction to the basic syntax of Velocity. By mastering these syntaxes, you can easily use the Velocity template engine for template development.

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