ExpressionParser (Spring Framework 4.3.30.RELEASE API)

所有已知实现类:
SpelExpressionParser, TemplateAwareExpressionParser
```
public interface ExpressionParser
```
Parses expression strings into compiled expressions that can be evaluated. Supports parsing templates as well as standard expression strings.
从以下版本开始:
3.0
作者:
Keith Donald, Andy Clement

方法概要

所有方法实例方法抽象方法
修饰符和类型	方法	说明
`Expression`	`parseExpression(String expressionString)`	Parse the expression string and return an Expression object you can use for repeated evaluation.
`Expression`	`parseExpression(String expressionString, ParserContext context)`	Parse the expression string and return an Expression object you can use for repeated evaluation.

- 方法详细资料
  - parseExpression
```
Expression parseExpression(String expressionString)
                    throws ParseException
```
    Parse the expression string and return an Expression object you can use for repeated evaluation.
    Some examples:
    3 + 4 name.firstName
    参数:
    expressionString - the raw expression string to parse
    返回:
    an evaluator for the parsed expression
    抛出:
    ParseException - an exception occurred during parsing
  - parseExpression
```
Expression parseExpression(String expressionString,
                           ParserContext context)
                    throws ParseException
```
    Parse the expression string and return an Expression object you can use for repeated evaluation.
    Some examples:
    3 + 4 name.firstName
    参数:
    expressionString - the raw expression string to parse
    context - a context for influencing this expression parsing routine (optional)
    返回:
    an evaluator for the parsed expression
    抛出:
    ParseException - an exception occurred during parsing