本文整理了Java中javax.servlet.jsp.el.Expression类的一些代码示例，展示了Expression类的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Expression类的具体详情如下：
包路径：javax.servlet.jsp.el.Expression
类名称：Expression

Expression介绍

[英]The abstract class for a prepared expression.

An instance of an Expression can be obtained via from an ExpressionEvaluator instance.

An Expression may or not have done a syntactic parse of the expression. A client invoking the evaluate() method should be ready for the case where ELParseException exceptions are raised.
[中]准备好的表达式的抽象类。
表达式的实例可以通过从ExpressionEvaluator实例获取。
表达式可能已经或没有对表达式进行语法分析。调用evaluate（）方法的客户端应该准备好处理引发ELParseException异常的情况。

代码示例

代码示例来源：origin: codefollower/Tomcat-Research

@Override
public Object evaluate(String expression,
    @SuppressWarnings("rawtypes") Class expectedType,
    VariableResolver vResolver, FunctionMapper fMapper)
    throws ELException {
  return this.parseExpression(expression, expectedType, fMapper).evaluate(vResolver);
}

代码示例来源：origin: jboss.web/jbossweb

public Object evaluate(String expression, Class expectedType,
    VariableResolver vResolver, FunctionMapper fMapper)
    throws ELException {
  return this.parseExpression(expression, expectedType, fMapper).evaluate(vResolver);
}

代码示例来源：origin: com.caucho/resin

/**
 * Evaluates an expression.
 */
public Object evaluate(String expression, Class expectedType,
            javax.servlet.jsp.el.VariableResolver resolver,
            FunctionMapper funMapper)
 throws javax.servlet.jsp.el.ELException
{
 Expression expr = parseExpression(expression, expectedType, funMapper);
  
 return expr.evaluate(resolver);
}

代码示例来源：origin: org.apache.tomcat/tomcat-jasper

@Override
public Object evaluate(String expression,
    @SuppressWarnings("rawtypes") Class expectedType,
    VariableResolver vResolver, FunctionMapper fMapper)
    throws ELException {
  return this.parseExpression(expression, expectedType, fMapper).evaluate(vResolver);
}

代码示例来源：origin: org.apache.geronimo.ext.tomcat/jasper

@Override
public Object evaluate(String expression,
    @SuppressWarnings("rawtypes") // API does not use generics
    Class expectedType,
    VariableResolver vResolver, FunctionMapper fMapper)
    throws ELException {
  return this.parseExpression(expression, expectedType, fMapper).evaluate(vResolver);
}

代码示例来源：origin: org.seasar.mayaa/mayaa

public Object evaluate(String expression, Class expectedClass,
    VariableResolver vResolver, FunctionMapper fMapper)
    throws ELException {
  Expression exp = parseExpression(expression, expectedClass, fMapper);
  return exp.evaluate(vResolver);
}

代码示例来源：origin: org.jboss.web/jbossweb

public Object evaluate(String expression, Class expectedType,
    VariableResolver vResolver, FunctionMapper fMapper)
    throws ELException {
  return this.parseExpression(expression, expectedType, fMapper).evaluate(vResolver);
}

代码示例来源：origin: io.undertow.jastow/jastow

@Override
public Object evaluate(String expression,
    @SuppressWarnings("rawtypes") Class expectedType,
    VariableResolver vResolver, FunctionMapper fMapper)
    throws ELException {
  return this.parseExpression(expression, expectedType, fMapper).evaluate(vResolver);
}

代码示例来源：origin: com.ovea.tajin.server/tajin-server-tomcat7

@Override
public Object evaluate(String expression,
    @SuppressWarnings("rawtypes") // API does not use generics
    Class expectedType,
    VariableResolver vResolver, FunctionMapper fMapper)
    throws ELException {
  return this.parseExpression(expression, expectedType, fMapper).evaluate(vResolver);
}

代码示例来源：origin: org.compass-project/compass

protected Object evaluate(final Object o, ResourcePropertyMapping resourcePropertyMapping) throws ConversionException {
    try {
      VariableResolver variableResolver = new VariableResolver() {
        public Object resolveVariable(String variable) throws ELException {
          return o;
        }
      };
      return expression.evaluate(variableResolver);
    } catch (Exception e) {
      throw new ConversionException("Failed to evaluate [" + o + "] with expression [" + expression + "]", e);
    }
  }
}

代码示例来源：origin: com.bbossgroups/bboss-mvc

expressionCache.put(cacheKey, expr);
return expr.evaluate(pageContext.getVariableResolver());

代码示例来源：origin: org.zkoss.zk/zkmax

public Object evaluate(XelContext ctx) {
  //Test case: B30-1957661.zul where a function mapper is created
  //by zscript so it is different from one page to page
  //In this case, we cannot reuse parsed expression.
  //
  //Note: if nfm is null, we consider it as not-change since DSP
  //doesn't save function mapper when evaluating
  try {
    final FunctionMapper nfm = ctx.getFunctionMapper();
    if (nfm != null && _mapper != nfm)
      return new ApacheELFactory().evaluate(ctx, _rawexpr, _expected);
    final VariableResolver resolver = ctx.getVariableResolver();
    return _expr.evaluate(
      resolver != null ? new XelELResolver(resolver): null);
  } catch (ELException ex) {
    throw new XelException(ex);
  }
}

代码示例来源：origin: net.sourceforge.stripes/stripes

try {
  resolver.setCurrentValue(value);
  Boolean result = (Boolean) expr.evaluate(resolver);
  if (!Boolean.TRUE.equals(result)) {
    ValidationError error = new ScopedLocalizableError(ERROR_DEFAULT_SCOPE,

代码示例来源：origin: StripesFramework/stripes

try {
  resolver.setCurrentValue(value);
  Boolean result = (Boolean) expr.evaluate(resolver);
  if (!Boolean.TRUE.equals(result)) {
    ValidationError error = new ScopedLocalizableError(ERROR_DEFAULT_SCOPE,