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ExpressionParser源码分析

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linlei 2024-03-14 17:03:20 +08:00
parent d24dd35aef
commit 543533ca40
3 changed files with 1029 additions and 46 deletions
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README.md
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@ -13,7 +13,7 @@
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spring-spel/spring-spel-expressionParser/README.md
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spring-spel/spring-spel-expressionParser/src/main/java/com/xcs/spring/ExpressionParserDemo.java
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@ -17,23 +17,8 @@ public class ExpressionParserDemo {
ExpressionParser parser = new SpelExpressionParser(); ExpressionParser parser = new SpelExpressionParser();
// 解析基本表达式 // 解析基本表达式
try {
Expression expression = parser.parseExpression("100 * 2 + 10"); Expression expression = parser.parseExpression("100 * 2 + 10");
Integer result = expression.getValue(Integer.class); Integer result = expression.getValue(Integer.class);
System.out.println("表达式 '100 * 2 + 10' 的结果为: " + result); System.out.println("表达式 '100 * 2 + 10' 的结果为: " + result);
} catch (ParseException e) {
System.err.println("解析表达式出错: " + e.getMessage());
}
// 使用上下文的解析
try {
StandardEvaluationContext context = new StandardEvaluationContext();
context.setVariable("myVariable", 50);
Expression expressionWithContext = parser.parseExpression("100 * #myVariable + 10");
Integer resultWithContext = expressionWithContext.getValue(context, Integer.class);
System.out.println("带上下文的表达式 '100 * #myVariable + 10' 的结果为: " + resultWithContext);
} catch (ParseException e) {
System.err.println("解析带上下文的表达式出错: " + e.getMessage());
}
} }
} }