通过流访问JSP并且动态添加参数

fileDownloadPath = http://localhost:8303/aws_file_server/print_label.jsp  
 URL url = new URL(fileDownloadPath);
        URLConnection connection = url.openConnection();
        connection.setDoOutput(true);

        PrintWriter outStream = new PrintWriter(connection.getOutputStream());
        outStream.print("username=" + username);//xxxxx
        outStream.print("&password=" + password);//12345678
        outStream.print("&xml=" + xml); //<?xml version="1.0" encoding="UTF-8" ?>
        <PrintLabelInfo><IdType>id_type_party</IdType>
        <StartPrintNumber>1</StartPrintNumber><OrderBy>name</OrderBy><EnqSeq>27099272</EnqSeq><PrintOpt>0</PrintOpt></PrintLabelInfo>
        
        outStream.print("&source=" + PrintInfo.SOURCE_WEB);//WEB
        outStream.print("&token=" + token);//0
        outStream.print("&queue_category=" + queueCategory); // LABEL
        outStream.print("&agent_code=" + agentCode);//xxxxx				outStream.close();
        InputStream in = connection.getInputStream(); ==> jump to print_label_now.jsp

上面的        InputStream in = connection.getInputStream(); ==> 跳转到新的URL中
下面的： 获取新参数值

String newUsername = request.getParameter("username");
    String newPassword = request.getParameter("password");
    String source = request.getParameter("source");
    String token = request.getParameter("token");
    String xml = request.getParameter("xml");
    String queueCategory = request.getParameter("queue_category");
    String agentCode = request.getParameter("agent_code");
    if (agentCode == null && xml != null && !"".equals(xml)) {
        agentCode = getValueByAttribute(xml, "agent_code");
    }