JavaScript和Applet通信

1、Javascript要访问的Applet的方法或属性必须都是public的 

2、在html中给applet的name属性赋值，以前是用applet标签，现在要用object，也是一样，如下（看红色name属性）： 

< OBJECT
    classid  =   " clsid:8AD9C840-044E-11D1-B3E9-00805F499D93 "
    codebase  =   " http://java.sun.com/update/1.5.0/jinstall-1_5-windows-i586.cab#Version=5,0,0,7 "
    WIDTH  =   600  HEIGHT  =   470  name = " browseFileApplet " >
     < PARAM NAME  =  CODE VALUE  =   " com.jointforce.applet.browsefile.BrowseFileApplet.class "   >
     < PARAM NAME  =  ARCHIVE VALUE  =   " browsefileapplet.jar "   >
     < PARAM NAME  =   " type "  VALUE  =   " application/x-java-applet;version=1.4 " >
     < PARAM NAME  =   " scriptable "  VALUE  =   " false " >
     < PARAM NAME  =  username VALUE = " <%=username%> " >
     < PARAM NAME  =  socketserverip VALUE = " <%=ssip%> " >
     < PARAM NAME  =  socketserverport VALUE = " <%=ssport%> " >
     < PARAM NAME  =  sockettimeout VALUE = " <%=sto%> " >
     < PARAM NAME  =  userhomedirectory VALUE = " <%=uhd%> " >

     < COMMENT >
< EMBED
            type  =   " application/x-java-applet;version=1.4 "  \
            CODE  =   " com.jointforce.applet.browsefile.BrowseFileApplet.class "  \
            ARCHIVE  =   " browsefileapplet.jar "  \
            WIDTH  =   600  \
            HEIGHT  =   470  \
            name  =   " browseFileApplet "  \
            username  = " <%=username%> "  \
            socketserverip  = " <%=ssip%> "  \
            socketserverport  = " <%=ssport%> "  \
            sockettimeout  = " <%=sto%> "  \
            userhomedirectory  = " <%=uhd%> "  \
     scriptable  =   false  \
     pluginspage  =   " http://java.sun.com/products/plugin/index.html#download " >
      < NOEMBED >
    
             </ NOEMBED >
</ EMBED >
     </ COMMENT >
</ OBJECT >

 

3、在javascript中直接就可以访问了，如下： 

function okbtnpressed() {
     //  current selection is a directory or a file? getCurrentSel是applet的一个方法
    var currentSel  =  window.document.browseFileApplet.getCurrentSel();
     if  (currentSel  ==   " OK " ) {
        window.opener.document.SubmitTaskForm.executable.value  =  window.document.browseFileApplet.result;   // result是applet的一个成员变量
        window.opener  =   null ;
         return  window.close();
         return   false ;
    }  else  {
        alert( " 请选择一个文件！ " );
         return   false ;
    }
}

 

这种方法只在IE中有效，在Firefox中无效。后面将有一篇文章谈到如何在Firefox和IE中都能让JavaScript和JAVA通讯。