如何在groovy中捕获wget命令输出

import java.io.BufferedReader
import java.io.InputStreamReader

def wgetCommand = "wget https://example.com/file.txt"

ProcessBuilder processBuilder = new ProcessBuilder("bash", "-c", wgetCommand)
Process process = processBuilder.start()

BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()))
String line
StringBuilder output = new StringBuilder()
while ((line = reader.readLine()) != null) {
    output.append(line).append("\n")
}

int exitCode = process.waitFor()

if (exitCode == 0) {
    println "wget命令输出：\n${output}"
} else {
    println "wget命令执行失败，退出代码：${exitCode}"
}