今天終於將一個頭疼我好幾天的問題解決了，難點 多線程、socket服務、swt中本身的線程模式;html
首先講解一下我項目中遇到的問題，首先是我建立了一個shell窗口,作了一個內嵌瀏覽器，當我進入到index頁面的時候，開始進行socket服務,我單獨起的線程，負責接收客戶端發送過來的消息，當我讀到客戶端發送的參數，我又建立一個線程去讀取並返回給客戶端,通過驗證參數的正確性以後，控制內嵌瀏覽器的頁面跳轉，問題就出在這裏，首先我覺得是多線程之間通訊的問題，因而我查了相關資料發現多線程之間相互調用是沒有問題的。舉例：shell
public class Thread2 {
public void m4t1() {
synchronized(this) {
int i = 5;
while( i-- > 0) {
System.out.println(Thread.currentThread().getName() + " : " + i);
try {
Thread.sleep(500);
} catch (InterruptedException ie) {
}
}
}
}
public void m4t2() {
int i = 5;
while( i-- > 0) {
System.out.println(Thread.currentThread().getName() + " : " + i);
try {
Thread.sleep(500);
} catch (InterruptedException ie) {
}
}
}
public static void main(String[] args) {
final Thread2 myt2 = new Thread2(); 瀏覽器
final Thread th= new Thread(new Runnable() {多線程
public void run(){ eclipse
myt2.m4t2();//調用主線程的方法socket
// System.out.println(browser.getUrl());ide
System.out.println("-------");測試
}});
Thread t1 = new Thread( new Runnable() { th.start(); }, "t1" ); //線程1,開啓子線程
Thread t2 = new Thread( new Runnable() { public void run() { myt2.m4t2(); } }, "t2" ); //線程2
t1.start();
t2.start();
}
}this
子線程能夠獲取主線程的變量或者方法,這個流程是同的，個人線程模式跟着相似，因而我把個人代碼開始移植到這裏，進行進一步測試url
public class ThreadMain extends Shell {
public static CoolBrowser browser;//封裝的內嵌瀏覽器
public static String urlStr;//url地址
public static Combo url;
public ThreadMain(Display display){
super(display, SWT.NO_TRIM);
createContents();//初始化窗口
}
public void createContents() {
setText("SWT Application");
setSize(1366, 768);
setText("自助換電系統");
//CentreWnd(this);
Composite controls = new Composite(this, SWT.NONE);
browser = new CoolBrowser(this, SWT.NONE);
System.out.println(browser.handle);
url = new Combo(controls, SWT.ARROW_DOWN);
url.setFocus();
FormData fd_controls = new FormData();
fd_controls.bottom = new FormAttachment(0, 800);
fd_controls.right = new FormAttachment(0, 1366);
controls.setLayoutData(fd_controls);
this.setLayout(new FormLayout());
String projPath = System.getProperty("user.dir");
browser.setSize(1366, 768);
LogInfo.logInfo(NewCard.class,projPath+"====projPath");
urlStr =projPath+"/chargingStation/index.html";
browser.setUrl(urlStr);
browser.addLocationListener(new AdvancedLocationListener(url));
//以上是對瀏覽器和窗口的初始化
// browser.setUrl(urlStr);
}
public void m4t1() {
synchronized(this) {
int i = 5;
while( i-- > 0) {
System.out.println(Thread.currentThread().getName() + " : " + i);
try {
Thread.sleep(500);
} catch (InterruptedException ie) {
}
}
}
}
public void m4t2() {
int i = 5;
while( i-- > 0) {
System.out.println(Thread.currentThread().getName() + " : " + i);
try {
Thread.sleep(500);
} catch (InterruptedException ie) {
}
}
}
@Override
protected void checkSubclass() {
// Disable the check that prevents subclassing of SWT components
}
public static void main(String[] args) {
Display display = Display.getDefault();
final ThreadMain myt2 = new ThreadMain(display);
final Thread th= new Thread(new Runnable() {
public void run(){
myt2.m4t2();
System.out.println(browser.getUrl());//報錯，獲取當前的URL地址
System.out.println("-------");
}});
// final Thread th = new Thread(,"t3");
Thread t1 = new Thread( new Runnable() { public void run() {th.start(); } }, "t1" );
Thread t2 = new Thread( new Runnable() { public void run() { myt2.m4t2(); } }, "t2" );
t1.start();
t2.start();
}
}
啓動報錯org.eclipse.swt.SWTException: Subclassing not allowed
重寫checkSubclass ()方法,方法體爲空.即在子類中添加:
protected void checkSubclass()
{
}
重寫以後報錯 org.eclipse.swt.SWTException: Invalid thread access
System.out.println(browser.getUrl());//報錯，獲取當前的URL地址
因而我查了相關資料
在SWT程序中,
SWT會自動建立一個用戶界面線程
非用戶界面線程不能直接操做用戶界面線程
因而我終於明白了，原來是這個東西在搞怪，
Display.getDefault().syncExec(new Runnable() {
public void run() {
System.out.println(browser.getUrl())
}
});
果真沒有問題，原本覺得是線程通訊的問題，通過不斷的摸索和同事的幫助，很是感謝
終於收穫了這個問題，線程也學到了不少