spring3.0学习札记(3)-SpEL表达式2
发布时间： 2012-11-10 10:48:51 作者： rapoo
spring3.0学习笔记(3)---SpEL表达式2
Java代码
例一：使用符号????//evaluates?to?true??boolean?trueValue=parser.parseExpression("2==2").getValue(Boolean.class);??//evaluates?to?false??boolean?falseValue=parser.parseExpression("2<-5.0").getValue(Boolean.class);????//evaluates?to?true??boolean?trueValue=parser.parseExpression("'black'<'block'").getValue(Boolean.class);?//字符串的比较????例二：判断是否是类中的一个实例????//evaluates?to?false??boolean?falseValue=parser.parseExpression("'xyz'??instanceofT(int)").getValue(Boolean.class);????例三：和正则表达式结合????//evaluates?to?true??boolean?trueValue?=?parser.parseExpression("'5.00'matches'^-?\\d+\\.\\d{2})?$'").getValue(Boolean.class);????//evaluates?to?false??boolean?falseValue?=?parser.parseExpression("'5.0067'matches'^-?\\d+(\\.\\d{2})?$'").getValue(Boolean.class);????例四：逻辑运算符????//--AND--??//evaluates?to?false??boolean?falseValue=parser.parseExpression("true?and?false").getValue(Boolean.class);//取后者??//evaluates?to?true??String?expression=?"isMember('NikolaTesla')??and??isMember('MihajloPupin')";??boolean?trueValue=parser.parseExpression(expression).getValue(societyContext,Boolean.class);??//--OR--??//evaluates?to??true??boolean?trueValue=parser.parseExpression("true??or???false").getValue(Boolean.class);??//evaluates??to??true??String??expression=?"isMember('Nikola?Tesla')??or??isMember('Albert?Einstien')";??boolean?trueValue=parser.parseExpression(expression).getValue(societyContext,Boolean.class);??//--NOT--??//evaluates?to?false??boolean?falseValue=parser.parseExpression("?!true").getValue(Boolean.class);??//--AND??and??NOT--??String?expression=?"isMember('NikolaTesla')?and?!isMember('MihajloPupin')";??boolean?falseValue=parser.parseExpression(expression).getValue(societyContext,Boolean.class);????例五：算术运算符????//Addition??int?two=parser.parseExpression("1+1").getValue(Integer.class);?//2??String?testString=parser.parseExpression("?'test'+'string'?").getValue(String.class);?//'teststring'??//Subtraction??int?four=parser.parseExpression("1-3").getValue(Integer.class);?//4??double?d=parser.parseExpression("1000.00-1e4").getValue(Double.class);?//-9000??//Multiplication??int?six=parser.parseExpression("-2*-3").getValue(Integer.class);?//6??double?twentyFour=parser.parseExpression("2.0*3e0*4").getValue(Double.class);?//24.0??//Division??int?minusTwo=parser.parseExpression("6/-3").getValue(Integer.class);?//-2??double?one=parser.parseExpression("8.0/4e0/2").getValue(Double.class);?//1.0??//Modulus??int?three=parser.parseExpression("7%4").getValue(Integer.class);?//3??int?one=parser.parseExpression("8/5%2").getValue(Integer.class);?//1??//Operator?precedence??int?minusTwentyOne=parser.parseExpression("1+2-3*8").getValue(Integer.class);?//-21???
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