Jenkins Groovy：将参数转换为大写

Question

How do I convert a parameter string to uppercase and use it in my Jenkins file ?

def parameters = [:]

// I get all the parameters from an ini file here and one of the parameter 'NAME' has its value in lowercase.

stage('example')
{
    echo 'converting parameter to uppercase'
    def a = ${parameters['NAME']}.toUpperCase()
    echo "${a}";
    bat "example.bat arg1 ${a}"
}

// THis is giving me some huge error when I run my Jenkins job with these lines in my file

Answer 1

What's the error?
Possibility: Groovy isn't sure that "${parameters['NAME']}" is a string. Try coercing it first, then do a .toUpperCase:

def a = ${parameters['NAME']}.toString().toUpperCase();
or
def a = parameters['NAME'].toString().toUpperCase();

Answer 2

${} is needed for string interpolation. Following link should help.

http://docs.groovy-lang.org/latest/html/documentation/#_string_interpolation