RAP 操作servlet实现Excel下载

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RAP中操作servlet实现Excel下载

// servlet名
private final  String SERVICE_HANDLER_ID="GridExportExcel";
public File exportExcel2Local(final File file){
	File newFile=null;
	try{
		RWT.getServiceManager().registerServiceHandler(SERVICE_HANDLER_ID,new IServiceHandler() {
			public void service() throws IOException, ServletException {
				HttpServletResponse response=RWT.getResponse();
				OutputStream out=response.getOutputStream();
				response.setContentType("application/force-download");
				response.setHeader("Content-Disposition",
						"attachment; filename="
								+ new String(file.getName()));
				FileInputStream fis = new FileInputStream(file);
				byte[] bt = new byte[1024];
				for (int size = 0; size != -1; size = fis.read(bt)) {
					out.write(bt, 0, size);
					out.flush();
				}
				
				fis.close();
				file.delete();
			}
		});

		Browser brower=new Browser(Display.getCurrent().getActiveShell(),SWT.NONE);
		brower.setUrl(getUrl(file.getCanonicalPath()));
	}
	catch(Exception ex){
		ex.printStackTrace();
		MessageDialog.openConfirm(new Shell(),"错误提示","出错了:"+ex.getMessage());
	}
	return newFile;
}

public  String getUrl( String token ) {
		StringBuffer url = new StringBuffer();
	    url.append( RWT.getRequest().getContextPath() );
	    url.append( RWT.getRequest().getServletPath() );
	    url.append( "?" );
	    url.append( IServiceHandler.REQUEST_PARAM ).append( "=" ).append( SERVICE_HANDLER_ID );
	    url.append( "&" );
	    url.append("file").append( "=" ).append( token );
	    int relativeIndex = url.lastIndexOf( "/" );
	    if( relativeIndex > -1 ) {
	      url.delete( 0, relativeIndex + 1 );
	    }
	    return RWT.getResponse().encodeURL( url.toString() );

	 }