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我目前正在开发一个使用Apache的http API的HTTP应用程序,我正在使用GUI。在每次GET或POST请求之后,我想用一些消息更新GUI TextArea。问题是这些消息在所有请求完成后才会出现。Java Apache httpclient阻止GUI
我还注意到,如果我在每次请求后在控制台上写入消息,则会出现消息,但如果我在GUI上编写所有消息,则会在末尾显示。
下面是一些代码段:
GUI构造:
public GUI() {
initComponents();
SetMessage.gui = this;
}
SetMessage类:
public class SetMessage implements Runnable{
public static GUI gui;
private String msg;
public SetMessage(String msg){
synchronized(gui){
this.msg = msg;
}
}
public void run() {
gui.setText(msg);
}
}
的GET请求类(每一个请求是由一个线程制造):
public class SendGetReq extends Thread {
private HttpConnection hc = null;
private DefaultHttpClient httpclient = null;
private HttpGet getreq = null;
private int step = -1;
private String returnString = null;
public SendGetReq(HttpConnection hc, DefaultHttpClient httpclient, HttpGet getreq, int step) {
this.hc = hc;
this.httpclient = httpclient;
this.getreq = getreq;
this.step = step;
}
@Override
public void run() {
// CODE
}
和HttpConnection类(当我按下GUI上的按钮时创建此类的实例):
public class HttpConnection {
private DefaultHttpClient httpclient = null;
private HttpGet getreq = null;
private HttpPost postreq = null;
private SendGetReq tempGet = null;
// More fields
private void RandomMethod(){
//Initialize getreq
(tempGet = new SendGetReq(this, httpclient, getreq, 0)).start();
new SetMessage("Message").run();
}
哦!和GUI的方法的setText:
public synchronized void setText(String msg){
if(!"".equals(msg)){
Date currentDate = new Date();
Calendar calendar = GregorianCalendar.getInstance();
calendar.setTime(currentDate);
jTextArea1.append(calendar.get(Calendar.HOUR_OF_DAY)+":"+calendar.get(Calendar.MINUTE)+":"+calendar.get(Calendar.SECOND)+" --- "+msg+"\n");
}
}
谁能帮我解决这个问题?谢谢! }
但是我在另一个线程中发出http请求...而你通过“通知GUI线程更新UI”是什么意思。我怎样才能做到这一点? –
你是否在'SendGetReq#run()'方法中的任何内容上同步?这可能会阻止'GUI#setText()'方法。 –
我想通了...终于...谢谢! –