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javaswing动态更新ui布局

发布时间：2017-09-23 10:44:47编辑：雪饮阅读（）

 用到远程地址json解析详见javase请求并解析后端返回的json数据

用到远程网络url文件下载详见javase实现网络url文件下载（解决小文件下载问题）

package test;

import java.awt.Color;

import java.awt.Dimension;

import java.awt.FlowLayout;

import java.awt.Toolkit;

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import javax.swing.ImageIcon;

import javax.swing.JButton;

import javax.swing.JLabel;

import javax.swing.JOptionPane;

import javax.swing.JPanel;

import javax.swing.JFrame;

import org.apache.http.HttpResponse;

import org.apache.http.StatusLine;

import org.apache.http.client.ClientProtocolException;

import org.apache.http.client.HttpClient;

import org.apache.http.client.methods.HttpGet;

import org.apache.http.impl.client.DefaultHttpClient;

import ui.HttpRequestUtil;

import bean.JsonBean;

public class test extends JFrame {

private static final long serialVersionUID = 1L;

private static JPanel jContentPane = null;

private static JFrame frame;

    private static JButton jButton;

public test() {super();}

public static boolean download(String url,String filename){

        HttpClient httpClient = new DefaultHttpClient();

        HttpGet httpGet = new HttpGet(url);    

        HttpResponse httpResponse;

try {

httpResponse = httpClient.execute(httpGet);

StatusLine statusLine = httpResponse.getStatusLine();    

       if (statusLine.getStatusCode() == 200) {    

           File xml = new File("c:/sitemap/"+filename);    

           FileOutputStream outputStream = new FileOutputStream(xml);       

           InputStream inputStream = httpResponse.getEntity().getContent();     

           byte buff[] = new byte[4096];    

           int counts = 0;    

           while ((counts = inputStream.read(buff)) != -1) {    

               System.out.println(".......");    

               outputStream.write(buff, 0, counts);       

           }    

           outputStream.flush();    

           outputStream.close();    

       }  

}

catch (ClientProtocolException e) {return false;}

catch (IOException e) {return false;}    

        httpClient.getConnectionManager().shutdown(); 

        return true;

    }

public static void main(String[] args) {

initialize();

      //界面初始化绘制完毕后开启子线程请求数据

 JsonBean jsonData=HttpRequestUtil.httpRequest("http://localhost/", "POST", "");

      //默认图片

      String localImg="C:/mz.png";

      for(JsonBean.DataBean.ListBean list: jsonData.getData().getListBean()){

      JLabel jlabel=new JLabel();

      jlabel.setText(list.getTitle());

      jlabel.setPreferredSize(new Dimension(120,113));

      String thumb=list.getThumb();

      String timestr=list.getImputti()+".jpg";

      //如果文件网址为空则不下载，直接加载本地图片

      if(thumb==null||thumb.isEmpty()){jlabel.setIcon(new ImageIcon(localImg));}

      else{

      if(download(thumb,timestr)){jlabel.setIcon(new ImageIcon("c:/sitemap/"+timestr));}

      }

      jContentPane.add(jlabel);

      //这个最重要重新触发ui

        frame.setVisible(true);

      }

   }

private static void initialize() {

frame = new JFrame("LabelDemo");

frame.setExtendedState(MAXIMIZED_BOTH);

frame.setContentPane(getJContentPane());

frame.setTitle("JFrame");

frame.setVisible(true);

}

private static JPanel getJContentPane() {

if (jContentPane == null) {

jContentPane = new JPanel();

jContentPane.setBackground(Color.blue);

jContentPane.setLayout(new FlowLayout());

JButton jpanel=getJButton();

jContentPane.add(jpanel);

}

return jContentPane;

}

private static JButton getJButton() {

if (jButton == null) {

jButton = new JButton();

jButton.setText("测试");

jButton.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent e) {

Toolkit.getDefaultToolkit().beep();

JOptionPane.showMessageDialog(null, "INFORMATION_MESSAGE", "INFORMATION_MESSAGE",JOptionPane.INFORMATION_MESSAGE);

}

});

}

return jButton;

}

}