EmbeddedPlaceholderResolver.java 文件源码

public String resolvePlaceholders(String str, boolean asPropName) {
    if (asPropName) {
        String strResolving = PlaceholderConfigurerSupport.DEFAULT_PLACEHOLDER_PREFIX + str + PlaceholderConfigurerSupport.DEFAULT_PLACEHOLDER_SUFFIX,
            strResolved = this.beanFactory.resolveEmbeddedValue(strResolving);

        if (!strResolved.equals(strResolving)) {
            str = strResolved;
        }
    } else {
        str = this.beanFactory.resolveEmbeddedValue(str);
    }

    return Objects.toString(this.beanExprResolver.evaluate(str, this.beanExprContext), null);
}