JSP userBean setProperty直接从request中获取参数

JSP userBean setProperty直接从request中获取参数：

form表单Jsp：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<%@ page isELIgnored="true"%>

<%

    String path = request.getContextPath();

    String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/";

%>

<!DOCTYPE html>

<html>

<head>

<meta charset="UTF-8">

<title>008index</title>

</head>

<body>

    <form action="index015.jsp" method="post">

        <input type="text" name="userName">

        <input type="submit" value="submitUserName">

    </form>

    <form action="index015.jsp" method="post">

        <input type="text" name="name">

        <input type="submit" value="submitName">

    </form>

    <form action="index015.jsp" method="post">

        <input type="text" name="name">

        <input type="text" name="age">

        <input type="submit" value="submitNameAge">

    </form>

</body>

</html>

获取表单参数JSP：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<%@ page isELIgnored="true"%>

<%

    String path = request.getContextPath();

    String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/";

%>

<!DOCTYPE html>

<html>

<head>

<meta charset="UTF-8">

<title>008index</title>

</head>

<body>

    <p>

        <jsp:useBean id="person" class="com.stono.servlet.bean.Person">

            <jsp:setProperty name="person" property="name" param="userName1"></jsp:setProperty>

        </jsp:useBean>

        Name is <jsp:getProperty property="name" name="person"/>

        <pre>

            此处生成的servlet java文件为：

            org.apache.jasper.runtime.JspRuntimeLibrary.introspecthelper(_jspx_page_context.findAttribute("person"), "name", request.getParameter("userName1"), request, "userName1", false);

        </pre>

    </p>

    <p>

        <jsp:useBean id="person2" class="com.stono.servlet.bean.Person">

            <jsp:setProperty name="person2" property="name" ></jsp:setProperty>

        </jsp:useBean>

        Name is <jsp:getProperty property="name" name="person2"/>

        <pre>

            此处生成的servlet java文件为：

            org.apache.jasper.runtime.JspRuntimeLibrary.introspecthelper(_jspx_page_context.findAttribute("person2"), "name", request.getParameter("name"), request, "name", false);

        </pre>

    </p>

    <p>

        <jsp:useBean id="person3" class="com.stono.servlet.bean.Person">

            <jsp:setProperty name="person3" property="*" ></jsp:setProperty>

        </jsp:useBean>

        Name is <jsp:getProperty property="name" name="person3"/>

        Age is <jsp:getProperty property="age" name="person3"/>

        <pre>

            此处生成的servlet java文件为：

            org.apache.jasper.runtime.JspRuntimeLibrary.introspect(_jspx_page_context.findAttribute("person3"), request);

       </pre>

    </p>

</body>

</html>

获取表单参数JSP的servlet：

/*

 * Generated by the Jasper component of Apache Tomcat

 * Version: Apache Tomcat/7.0.35

 * Generated at: 2015-10-26 00:15:33 UTC

 * Note: The last modified time of this file was set to

 *       the last modified time of the source file after

 *       generation to assist with modification tracking.

 */

package org.apache.jsp;

import javax.servlet.*;

import javax.servlet.http.*;

import javax.servlet.jsp.*;

import java.util.*;

public final class index015_jsp extends org.apache.jasper.runtime.HttpJspBase

    implements org.apache.jasper.runtime.JspSourceDependent {

  private static final javax.servlet.jsp.JspFactory _jspxFactory =

          javax.servlet.jsp.JspFactory.getDefaultFactory();

  private static java.util.Map<java.lang.String,java.lang.Long> _jspx_dependants;

  private javax.el.ExpressionFactory _el_expressionfactory;

  private org.apache.tomcat.InstanceManager _jsp_instancemanager;

  public java.util.Map<java.lang.String,java.lang.Long> getDependants() {

    return _jspx_dependants;

  }

  public void _jspInit() {

    _el_expressionfactory = _jspxFactory.getJspApplicationContext(getServletConfig().getServletContext()).getExpressionFactory();

    _jsp_instancemanager = org.apache.jasper.runtime.InstanceManagerFactory.getInstanceManager(getServletConfig());

  }

  public void _jspDestroy() {

  }

  public void _jspService(final javax.servlet.http.HttpServletRequest request, final javax.servlet.http.HttpServletResponse response)

        throws java.io.IOException, javax.servlet.ServletException {

    final javax.servlet.jsp.PageContext pageContext;

    javax.servlet.http.HttpSession session = null;

    final javax.servlet.ServletContext application;

    final javax.servlet.ServletConfig config;

    javax.servlet.jsp.JspWriter out = null;

    final java.lang.Object page = this;

    javax.servlet.jsp.JspWriter _jspx_out = null;

    javax.servlet.jsp.PageContext _jspx_page_context = null;

    try {

      response.setContentType("text/html;charset=UTF-8");

      pageContext = _jspxFactory.getPageContext(this, request, response,

                  null, true, 8192, true);

      _jspx_page_context = pageContext;

      application = pageContext.getServletContext();

      config = pageContext.getServletConfig();

      session = pageContext.getSession();

      out = pageContext.getOut();

      _jspx_out = out;

      out.write("\r\n");

      out.write("\r\n");

    String path = request.getContextPath();

    String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/";

      out.write("\r\n");

      out.write("<!DOCTYPE html>\r\n");

      out.write("<html>\r\n");

      out.write("<head>\r\n");

      out.write("<meta charset=\"UTF-8\">\r\n");

      out.write("<title>008index</title>\r\n");

      out.write("</head>\r\n");

      out.write("<body>\r\n");

      out.write("\t<p>\r\n");

      out.write("\t\t");

      com.stono.servlet.bean.Person person = null;

      person = (com.stono.servlet.bean.Person) _jspx_page_context.getAttribute("person", javax.servlet.jsp.PageContext.PAGE_SCOPE);

      if (person == null){

        person = new com.stono.servlet.bean.Person();

        _jspx_page_context.setAttribute("person", person, javax.servlet.jsp.PageContext.PAGE_SCOPE);

        out.write("\r\n");

        out.write("\t\t\t");

        org.apache.jasper.runtime.JspRuntimeLibrary.introspecthelper(_jspx_page_context.findAttribute("person"), "name", request.getParameter("userName1"), request, "userName1", false);

        out.write("\r\n");

        out.write("\t\t");

      }

      out.write("\r\n");

      out.write("\t\tName is ");

      out.write(org.apache.jasper.runtime.JspRuntimeLibrary.toString((((com.stono.servlet.bean.Person)_jspx_page_context.findAttribute("person")).getName())));

      out.write("\r\n");

      out.write("\t</p>\r\n");

      out.write("\t<p>\r\n");

      out.write("\t\t");

      com.stono.servlet.bean.Person person2 = null;

      person2 = (com.stono.servlet.bean.Person) _jspx_page_context.getAttribute("person2", javax.servlet.jsp.PageContext.PAGE_SCOPE);

      if (person2 == null){

        person2 = new com.stono.servlet.bean.Person();

        _jspx_page_context.setAttribute("person2", person2, javax.servlet.jsp.PageContext.PAGE_SCOPE);

        out.write("\r\n");

        out.write("\t\t\t");

        org.apache.jasper.runtime.JspRuntimeLibrary.introspecthelper(_jspx_page_context.findAttribute("person2"), "name", request.getParameter("name"), request, "name", false);

        out.write("\r\n");

        out.write("\t\t");

      }

      out.write("\r\n");

      out.write("\t\tName is ");

      out.write(org.apache.jasper.runtime.JspRuntimeLibrary.toString((((com.stono.servlet.bean.Person)_jspx_page_context.findAttribute("person2")).getName())));

      out.write("\r\n");

      out.write("\t</p>\r\n");

      out.write("\t<p>\r\n");

      out.write("\t\t");

      com.stono.servlet.bean.Person person3 = null;

      person3 = (com.stono.servlet.bean.Person) _jspx_page_context.getAttribute("person3", javax.servlet.jsp.PageContext.PAGE_SCOPE);

      if (person3 == null){

        person3 = new com.stono.servlet.bean.Person();

        _jspx_page_context.setAttribute("person3", person3, javax.servlet.jsp.PageContext.PAGE_SCOPE);

        out.write("\r\n");

        out.write("\t\t\t");

        org.apache.jasper.runtime.JspRuntimeLibrary.introspect(_jspx_page_context.findAttribute("person3"), request);

        out.write("\r\n");

        out.write("\t\t");

      }

      out.write("\r\n");

      out.write("\t\tName is ");

      out.write(org.apache.jasper.runtime.JspRuntimeLibrary.toString((((com.stono.servlet.bean.Person)_jspx_page_context.findAttribute("person3")).getName())));

      out.write("\r\n");

      out.write("\t\tAge is ");

      out.write(org.apache.jasper.runtime.JspRuntimeLibrary.toString((((com.stono.servlet.bean.Person)_jspx_page_context.findAttribute("person3")).getAge())));

      out.write("\r\n");

      out.write("\t</p>\r\n");

      out.write("\t\r\n");

      out.write("</body>\r\n");

      out.write("</html>\r\n");

    } catch (java.lang.Throwable t) {

      if (!(t instanceof javax.servlet.jsp.SkipPageException)){

        out = _jspx_out;

        if (out != null && out.getBufferSize() != 0)

          try { out.clearBuffer(); } catch (java.io.IOException e) {}

        if (_jspx_page_context != null) _jspx_page_context.handlePageException(t);

        else throw new ServletException(t);

      }

    } finally {

      _jspxFactory.releasePageContext(_jspx_page_context);

    }

  }

}

POJO：

package com.stono.servlet.bean;

public class Person {

    // 对外的属性名称还是name，

    private String name2;

    private Integer age;

    public Integer getAge() {

        return age;

    }

    public void setAge(Integer age) {

        this.age = age;

    }

    public String getName() {

        return name2;

    }

    public void setName(String name) {

        this.name2 = name;

    }

}

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