WebStart JNLP参数传递

通过WebStart 启动打开JNLP文件，虽说可以通过url在浏览器中直接打开，但其中参数的传递该如何弄呢？

有两种方法：

1.修改WebStart源码

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

原方法为：

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;
}

如传递ticket参数，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文件方式动态生成JNLP文件，然后直接输出到浏览器。

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文件内容
* @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 {
//设置文件编码格式为utf-8
resp.setCharacterEncoding("utf-8");
//禁止浏览器和webstart缓存jnlp内容
resp.setHeader("Pragma", "no-cache");
resp.setHeader("Expires", "0");
//给定动态文件名
resp.setHeader("Content-Disposition", "filename=\"dynamic.jnlp\";");
//设置文件类型为jnlp文件类型
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);
}

}