json을 취득, 표시하는 어플리케이션 8

import groovy.swing.SwingBuilder
import groovy.json.JsonOutput
import groovy.beans.Bindable
import javax.swing.*
import java.awt.*
import java.net.*

def manager = new CookieManager()
manager.cookiePolicy = CookiePolicy.ACCEPT_ALL
CookieHandler.default = manager

@Bindable
class Model {
    String method = 'GET'
    String url = ''
    String params = ''
    String json = ''
}
def model = new Model()

def tabPane

def prettyPrint = { text ->
    def result = JsonOutput.prettyPrint(text)
    (result =~ /\\u[0-9a-zA-Z]{4}/).each { match ->
        def code = match[2..5]
        def encTxt = new String([Integer.parseInt(code, 16)] as int[], 0, 1)
        result = result.replaceAll(/\\u${code}/, encTxt)
    }
    result
}

def sendRequest = {
    model.json = ''

    def method = model.method
    def url = model.url
    def params = URLEncoder.encode(model.params, 'utf-8').replaceAll('%3D', '=').replaceAll('%26', '&')
    if (method == 'GET') {
        url = "${url}?${params}"
    }

    def conn = url.toURL().openConnection()
    conn.requestMethod = method
    if (method == 'POST') {
        conn.doOutput = true
        conn.outputStream << params
    }

    model.json = prettyPrint(conn.inputStream.getText('utf-8'))
    tabPane.selectedIndex = 1
}

new SwingBuilder().frame(title:'jsonを取得、表示するアプリケーション', defaultCloseOperation:JFrame.EXIT_ON_CLOSE,
                        size: [800, 600], show:true) {
    lookAndFeel('nimbus')
    borderLayout()
    hbox(constraints: BorderLayout.NORTH) {
        comboBox(items:['GET', 'POST'], selectedItem:bind(source: model, sourceProperty: 'method', mutual: true))
        textField(text:bind(source: model, sourceProperty: 'url', mutual: true))
        button(text:'送信', actionPerformed:sendRequest)
    }
    tabPane = tabbedPane(constraints: BorderLayout.CENTER) {
        scrollPane(name:'パラメータ') {
            textArea(text:bind(source: model, sourceProperty: 'params', mutual: true))
        }
        scrollPane(name:'レスポンス') {
            textArea(editable:false, text:bind {model.json})
        }
    }
}