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Binding:将请求中的字段按照名字匹配的原则填入模型对象。
1）@ModelAttribute on Method
2）redirect/forward
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CourseController.java
@RequestMapping(value="/admin", method = RequestMethod.GET, params = "add")//拦截ＵＲＬ对象/admin 2)请求参数add
public String createCourse(){
return "course_admin/edit";
}
@RequestMapping(value="/save", method = RequestMethod.POST)
// public String doSave(Course course){ 原始方法
//@ModelAttribute方法参数级别的annotation，来完成绑定参数的过程
public String doSave(@ModelAttribute Course course){
//日志信息，用来确认动作
log.debug("Info of Course:");
log.debug(ReflectionToStringBuilder.toString(course));
//在此进行业务操作，比如数据库持久化
course.setCourseId(123);
//请求重定向
return "redirect:view2/"+course.getCourseId();
}
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edit.jsp
页面空间名称和模型的属性名称一致。注意casesensitive。
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>我不是真正的慕课网</title> <link rel="stylesheet" href="<%=request.getContextPath()%>/resources/css/main.css" type="text/css" /> </head> <body> <div id="main"> <div class="newcontainer" id="course_intro"> <form name="mainForm" action="<%= request.getContextPath()%>/courses/save" method="post"> <div> <span>课程名称:</span><input type="text" id="title" name="title"> </div> <div> <span>课程时长:</span><input type="text" id="duration" name="duration"> 秒 </div> <div> <span>课程难度:</span> <select id="level" name="level"> <option value="0">初级</option> <option value="1" selected="selected">中级</option> <option value="2">高级</option> </select> </div> <div> <span>课程介绍:</span> <textarea id="descr" name="descr" rows="5" style="480px"></textarea> </div> <div> <input type="submit" id="btnPass" value="提交" /> </div> </form> </div> </div> </body> </html>
验证修改：
//maven操作
1）cmd:ctrl +c 停止jetty
cls
2）然后重新启动mvn jetty:run
查看cmd的log