本文介绍了一个使用Eclipse SWT浏览器部件来查询HTML文档中特定DOM节点值的方法。通过JavaScript执行简单的查询，获取页面上指定ID的元素内容。
查询DOM元素的值
/*
* Browser example snippet: query DOM node value
*
* For a list of all SWT example snippets see
* http://dev.eclipse.org/viewcvs/index.cgi/%7Echeckout%7E/platform-swt-home/dev.html#snippets
*/
import
org.eclipse.swt.SWT;
import
org.eclipse.swt.browser.Browser;
import
org.eclipse.swt.browser.ProgressEvent;
import
org.eclipse.swt.browser.ProgressListener;
import
org.eclipse.swt.browser.StatusTextEvent;
import
org.eclipse.swt.browser.StatusTextListener;
import
org.eclipse.swt.layout.FillLayout;
import
org.eclipse.swt.widgets.Display;
import
org.eclipse.swt.widgets.Shell;
public class
Snippet160
{
public static
void
main
(
String
[]
args
) {
final
String
html
=
"<html><title>Snippet</title><body><p id='myid'>Best Friends</p><p id='myid2'>Cat and Dog</p></body></html>"
;
Display display =
new
Display
()
;
final
Shell shell =
new
Shell
(
display
)
;
shell.setLayout
(
new
FillLayout
())
;
final
Browser browser =
new
Browser
(
shell, SWT.NONE
)
;
browser.addStatusTextListener
(
new
StatusTextListener
() {
public
void
changed
(
StatusTextEvent event
) {
browser.setData
(
"query"
, event.text
)
;
}
})
;
browser.addProgressListener
(
new
ProgressListener
() {
public
void
changed
(
ProgressEvent event
) {
}
public
void
completed
(
ProgressEvent event
) {
/*
* Use JavaScript to query the desired node content through the
* Document Object Model
*
* Assign result to the window property status to pass the
* result to the StatusTextListener This trick is required since
* <code>execute</code> does not return the <code>String</code>
* directly.
*/
boolean
result = browser
.execute
(
"window.status=document.getElementById('myid').childNodes[0].nodeValue;"
)
;
if
(
!result
) {
/*
* Script may fail or may not be supported on certain
* platforms.
*/
System.out.println
(
"Script was not executed."
)
;
return
;
}
String value =
(
String
)
browser.getData
(
"query"
)
;
System.out.println
(
"Node value: "
+ value
)
;
}
})
;
/* Load an HTML document */
browser.setText
(
html
)
;
shell.open
()
;
while
(
!shell.isDisposed
()) {
if
(
!display.readAndDispatch
())
display.sleep
()
;
}
display.dispose
()
;
}
}
* Browser example snippet: query DOM node value
*
* For a list of all SWT example snippets see
* http://dev.eclipse.org/viewcvs/index.cgi/%7Echeckout%7E/platform-swt-home/dev.html#snippets
*/
import org.eclipse.swt.SWT;
import org.eclipse.swt.browser.Browser;
import org.eclipse.swt.browser.ProgressEvent;
import org.eclipse.swt.browser.ProgressListener;
import org.eclipse.swt.browser.StatusTextEvent;
import org.eclipse.swt.browser.StatusTextListener;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
public class Snippet160 {
public static void main ( String [] args ) {
final String html = "<html><title>Snippet</title><body><p id='myid'>Best Friends</p><p id='myid2'>Cat and Dog</p></body></html>" ;
Display display = new Display () ;
final Shell shell = new Shell ( display ) ;
shell.setLayout ( new FillLayout ()) ;
final Browser browser = new Browser ( shell, SWT.NONE ) ;
browser.addStatusTextListener ( new StatusTextListener () {
public void changed ( StatusTextEvent event ) {
browser.setData ( "query" , event.text ) ;
}
}) ;
browser.addProgressListener ( new ProgressListener () {
public void changed ( ProgressEvent event ) {
}
public void completed ( ProgressEvent event ) {
/*
* Use JavaScript to query the desired node content through the
* Document Object Model
*
* Assign result to the window property status to pass the
* result to the StatusTextListener This trick is required since
* <code>execute</code> does not return the <code>String</code>
* directly.
*/
boolean result = browser
.execute ( "window.status=document.getElementById('myid').childNodes[0].nodeValue;" ) ;
if ( !result ) {
/*
* Script may fail or may not be supported on certain
* platforms.
*/
System.out.println ( "Script was not executed." ) ;
return ;
}
String value = ( String ) browser.getData ( "query" ) ;
System.out.println ( "Node value: " + value ) ;
}
}) ;
/* Load an HTML document */
browser.setText ( html ) ;
shell.open () ;
while ( !shell.isDisposed ()) {
if ( !display.readAndDispatch ())
display.sleep () ;
}
display.dispose () ;
}
}
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