HttpServlet 中使用JAVA BEAN 自省机制

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在JSP 中是这样用的：

<jsp:useBean id="bean" class="webtest.beans.UserBean"/>
<jsp:setProperty name="bean" property="*" />

查看work 目录JSP 转化成class 的代码后，

在Servlet中使用JAVA BEAN 自省机制，很简单只需要调用 org.apache.jasper.runtime.JspRuntimeLibrary.introspect()　方法

public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        UserBean bean=new UserBean();
        org.apache.jasper.runtime.JspRuntimeLibrary.introspect(bean,request);
        response.setContentType("text/html");
        PrintWriter out = response.getWriter();
        out.println("<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">");
        out.println("<HTML>");
        out.println("  <HEAD><TITLE>A Servlet</TITLE></HEAD>");
        out.println("  <BODY>");
        out.print("    This is ");
        out.print(this.getClass());
        out.print("<br>");
        out.print("username="+bean.getUsername());
        out.print("<br> password="+bean.getPassword());
        out.println(", using the POST method");
        out.println("  </BODY>");
        out.println("</HTML>");
        out.flush();
        out.close();
    }

注：开发时候，要导入jasper-runtime.jar　