json을 취득, 표시하는 어플리케이션 2

import groovy.swing.SwingBuilder
import javax.swing.*
import java.awt.*

def txtUrl
def txtJson

new SwingBuilder().frame(title:'', defaultCloseOperation:JFrame.EXIT_ON_CLOSE, size: [800, 600], show:true) {
    lookAndFeel('nimbus')
    borderLayout()
    hbox(constraints: BorderLayout.NORTH) {
        txtUrl = textField()
        button(text:'送信', actionPerformed:{txtJson.text = txtUrl.text.toURL().text })
    }
    scrollPane(constraints: BorderLayout.CENTER) {
        txtJson = textArea(editable:false)
    }
}