(Note：我看过类似的问题（例如this，其中的问题是无法修剪shell命令的输出），但我认为这种情况是不同的。）
我在Groovy中有一个使用参数的管道脚本（通过properties([parameters([...），当我将参数值插入到双引号字符串中时，它无法对捕获的（我指的是“captured and .trim（）d！”）stdout（这是我的用例）甚至简单的字符串文字进行.equals()检查。
我可以使用.trim()来解决这个问题，（尽管您可以通过我的回显和检查.length()来看到，.trim()没有任何内容），但我怀疑这只是“工作”，因为它执行了一个隐式的.toString()--这也是一个成功的解决方案。
对我来说，这看起来像是一个bug，但这实际上是我使用Groovy的第一周，所以也许我遗漏了一些东西--有人能解释一下是什么吗？
即使是一个简单的文字"foo"也会失败（例如"foo".equals("${params.foo_the_parameter}"）。插入的参数是其他类型的对象还是什么？
[EDIT从@Matias Bjarland得到答案后，我修改了下面的代码，使用println代替shell echo，因为这样输出更简洁。他建议的解决方案反映在注解块中。]
我的时髦代码：

node() {
    properties([
        parameters([
            string(
                defaultValue: 'foo',
                description: 'This is foo',
                name: 'foo_the_parameter'
            )
        ])
    ])

    /* this is what I learned from the accepted answer
    bob="${params.foo_the_parameter}"
    println("class of interpolated param is ${bob.class}")
    simple_foo="foo"
    println("class of \"foo\" is ${simple_foo.class}")
    */
    echoed_foo = sh(script:"echo 'foo'", returnStdout: true).trim()
    println "echoed foo is [$echoed_foo], params foo is [${params.foo_the_parameter}]";
    echo_foo_length = echoed_foo.length()
    dqs_foo_length = "${params.foo_the_parameter}".length()
    println "their lengths are: echo: [$echo_foo_length] and dqs: [$dqs_foo_length]";
    if (echoed_foo.equals("${params.foo_the_parameter}")) {
        println "SUCCESS they are equals()"
    }
    else {
        println "FAIL they are not equals()" //this one fires
    }
    if (echoed_foo.equals("${params.foo_the_parameter}".trim())) {
        println "SUCCESS they are equals() after the dqs gets a trim()" //this one fires
    }
    else {
        println "FAIL they are not equals()after the dqs gets a trim()"
    }
    if (echoed_foo.equals("${params.foo_the_parameter}".toString())) {
        println "SUCCESS they are equals() after the dqs gets a toString()" //this one fires
    }
    else {
        println "FAIL they are not equals()after the dqs gets a toString()"
    }

    if ("foo".equals("${params.foo_the_parameter}")) {
        println "SUCCESS at least a simple literal \"foo\" works"
    }
    else {
        println "FAIL even a simple literal \"foo\" fails to be .equals() with the interpolated parameter" //this one fires
    }
}

Jenkins输出：

Started by user Michael South
[Office365connector] No webhooks to notify
Obtained jenkins.groovy from git git@github.redacted.com:msouth/test_groovy_equals.git
Running in Durability level: MAX_SURVIVABILITY
[Pipeline] node
Running on subnet_mon_02 in /opt/jenkins/m1/workspace/field-analytics-org/test_string_equals
[Pipeline] {
[Pipeline] properties
[Pipeline] sh
[test_string_equals] Running shell script
+ echo foo
[Pipeline] echo
echoed foo is [foo], params foo is [foo]
[Pipeline] echo
their lengths are: echo: [3] and dqs: [3]
[Pipeline] echo
FAIL they are not equals()
[Pipeline] echo
SUCCESS they are equals() after the dqs gets a trim()
[Pipeline] echo
SUCCESS they are equals() after the dqs gets a toString()
[Pipeline] echo
FAIL even a simple literal "foo" fails to be .equals() with the interpolated parameter
[Pipeline] }
[Pipeline] // node
[Pipeline] End of Pipeline
[Office365connector] No webhooks to notify
Finished: SUCCESS