WebStart JNLP參數(shù)傳遞

作者：xcbeyond
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通過WebStart 啟動(dòng)打開JNLP文件，雖說可以通過url在瀏覽器中直接打開，但其中參數(shù)的傳遞該如何弄呢？

有兩種方法：
1.修改WebStart源碼

   需修改jnlp.sample.servlet.JnlpFileHandler.java中的specializeJnlpTemplate 方法

原方法為：

    private String specializeJnlpTemplate( HttpServletRequest request, String respath, String jnlpTemplate, Stack<Long> timeStack ) throws ErrorResponseException
        {
            System.out.println("JnlpFileHandler.specializeJnlpTemplate() jnlpTemplate:" + jnlpTemplate);
            System.out.println("request.getParameter(\"ticket\"):" + request.getParameter("ticket"));
            String urlprefix = getUrlPrefix( request );
            int idx = respath.lastIndexOf( '/' ); //
            String name = respath.substring( idx + 1 );    // Exclude /
            String codebase = respath.substring( 0, idx + 1 ); // Include /
            jnlpTemplate = substitute( jnlpTemplate, "$$name", name );
            jnlpTemplate = substitute( jnlpTemplate, "$$codebase", urlprefix + request.getContextPath() + codebase );
            jnlpTemplate = substitute( jnlpTemplate, "$$hostname", request.getServerName() );
            jnlpTemplate = substitute( jnlpTemplate, "$$context", urlprefix + request.getContextPath() );
            jnlpTemplate = substitute( jnlpTemplate, "$$site", urlprefix );
            
            ……
            return jnlpTemplate;
        }


如傳遞ticket參數(shù)，修改后：

    private String specializeJnlpTemplate( HttpServletRequest request, String respath, String jnlpTemplate, Stack<Long> timeStack ) throws ErrorResponseException
        {
            System.out.println("JnlpFileHandler.specializeJnlpTemplate() jnlpTemplate:" + jnlpTemplate);
            System.out.println("request.getParameter(\"ticket\"):" + request.getParameter("ticket"));
            String urlprefix = getUrlPrefix( request );
            int idx = respath.lastIndexOf( '/' ); //
            String name = respath.substring( idx + 1 );    // Exclude /
            String codebase = respath.substring( 0, idx + 1 ); // Include /
            jnlpTemplate = substitute( jnlpTemplate, "$$name", name );
            jnlpTemplate = substitute( jnlpTemplate, "$$codebase", urlprefix + request.getContextPath() + codebase );
            jnlpTemplate = substitute( jnlpTemplate, "$$hostname", request.getServerName() );
            jnlpTemplate = substitute( jnlpTemplate, "$$context", urlprefix + request.getContextPath() );
            jnlpTemplate = substitute( jnlpTemplate, "$$site", urlprefix );
            if(null != request.getParameter("ticket") && !"".equals(request.getParameter("ticket"))) {
                jnlpTemplate = substitute( jnlpTemplate, "$$ticket", request.getParameter("ticket") );
                System.out.println("request ticket:" + request.getParameter("ticket"));
            }
            
           ……
            return jnlpTemplate;
        }







2.使用Sevlet或jsp文件方式動(dòng)態(tài)生成JNLP文件，然后直接輸出到瀏覽器。

    import java.io.File;
    import java.io.IOException;
    import java.io.PrintWriter;
    import java.nio.charset.Charset;
    import java.util.ArrayList;
     
    import javax.servlet.ServletException;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
     
    /**
     * 生成JNLP文件內(nèi)容
     * @author xcbeyond
     * 2017-7-20上午09:19:06
     */
    public class PrintJnlpFileServlet extends HttpServlet{
        private static final long serialVersionUID = 2476758371307727115L;
        
        @Override
        protected void doGet(HttpServletRequest request, HttpServletResponse resp)
                throws ServletException, IOException {
        //設(shè)置文件編碼格式為utf-8
        resp.setCharacterEncoding("utf-8");
        //禁止瀏覽器和webstart緩存jnlp內(nèi)容
        resp.setHeader("Pragma", "no-cache");
        resp.setHeader("Expires", "0");
        //給定動(dòng)態(tài)文件名
        resp.setHeader("Content-Disposition", "filename=\"dynamic.jnlp\";");
        //設(shè)置文件類型為jnlp文件類型
        resp.setContentType("application/x-java-jnlp-file");
            
            PrintWriter pw = resp.getWriter();
            pw.println("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
            pw.println("<jnlp spec=\"1.6+\" codebase=\"http://localhost:8080/\" href=\"\">");
            pw.println("    <information>");
            ……
            
            pw.println("    <application-desc main-class=\"org.apache.pivot.wtk.DesktopApplicationContext\">");
            ……
            pw.println("        <argument>--ticket=" + request.getParameter("ticket") + "</argument>");
            pw.println("    </application-desc>");
            pw.println("</jnlp>");
            
       
            pw.flush();
            pw.close();
        }
     
        @Override
        protected void doPost(HttpServletRequest req, HttpServletResponse resp)
                throws ServletException, IOException {
            super.doPost(req, resp);
        }
        
        
     
    }