学习目标：
前言：表单标签库的简单运用
代码：
main.jsp:
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!-- 要使用Spring MVC提供的表单标签，首先需要在视图页面添加： -->
<%@ taglib prefix="fm" uri="http://www.springframework.org/tags/form" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'main.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
<!-- modelAttribute属性指定该form绑定的是哪个Model，
当指定了对应的Model后就可以在form标签内部其它表单标签
上通过为path指定Model属性的名称来绑定Model中的数据了，
method属性指定form的提交方式如GET、POST等。 -->
<fm:form modelAttribute="user">
<!-- 会生成一个type为text的Html input标签，通过path属性来指定要绑定的Model中的值。 -->
姓名：<fm:input path="name"/><br><br>
编号：<fm:input path="number"/><br><br>
年龄：<fm:input path="age"/><br><br>
爱好：<fm:checkbox path="hobbys" value="运动" label="运动运动"></fm:checkbox>
<fm:checkbox path="hobbys" value="看书" label="看书看书"></fm:checkbox>
<fm:checkbox path="hobbys" value="游戏" label="游戏游戏"></fm:checkbox><br><br>
性别：<fm:radiobutton path="sex" value="男"/>男
<fm:radiobutton path="sex" value="女"/>女 <br><br>
学院:<fm:select path="dept">
<fm:option value="1">信息与控制学院</fm:option>
<fm:option value="2">生命学院</fm:option>
<fm:option value="3">经管学院</fm:option>
<fm:option value="4">学前教育学院</fm:option>
</fm:select><br><br>
</fm:form>
</body>
</html>
model:
package model;
import java.util.List;
public class User {
private String name;
private int age;
private String number;
private List<String> hobbys;
private String sex;
private int dept;
/**
* @return the name
*/
public String getName() {
return name;
}
/**
* @param name the name to set
*/
public void setName(String name) {
this.name = name;
}
/**
* @return the age
*/
public int getAge() {
return age;
}
/**
* @param age the age to set
*/
public void setAge(int age) {
this.age = age;
}
/**
* @return the number
*/
public String getNumber() {
return number;
}
/**
* @param number the number to set
*/
public void setNumber(String number) {
this.number = number;
}
/**
* @return the hobbys
*/
public List<String> getHobbys() {
return hobbys;
}
/**
* @param hobbys the hobbys to set
*/
public void setHobbys(List<String> hobbys) {
this.hobbys = hobbys;
}
/**
* @return the sex
*/
public String getSex() {
return sex;
}
/**
* @param sex the sex to set
*/
public void setSex(String sex) {
this.sex = sex;
}
/**
* @return the dept
*/
public int getDept() {
return dept;
}
/**
* @param dept the dept to set
*/
public void setDept(int dept) {
this.dept = dept;
}
}
HelloController:
package controller;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import model.User;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.SessionAttributes;
import org.springframework.web.servlet.ModelAndView;
@Controller
@RequestMapping(value="/hello")
@SessionAttributes(value="user")
public class HelloController {
//形参方式
@RequestMapping(value="/register",method=RequestMethod.POST)
public String register( String username, String pwd, String age,Model m){
if(username.equals("1931030119")){
//1创建一个对象：绑定数据用
User user = new User();
//2设置用户名
user.setName("lisi");
//3设置年龄
user.setAge(18);
//4设置编号
user.setNumber("A001");
String a[]={"运动","看书","游戏"};
List<String> list = new ArrayList();
for(int i =0;i<3;i++){
list.add(a[i]);
}
user.setHobbys(list);
user.setSex("男");
user.setDept(4);
//设置user值，返回给结果页面
m.addAttribute("user",user);
//返回结果页面
return "main";
}else{
return "index";
}
}
}
常见问题：
1.
乱码问题可以在web.xml设置过滤器解决，代码如下
<filter>
<filter-name>EncodingFilter</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
<init-param>
<param-name>forceEncoding</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>EncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
该问题可能因为其他标签未包含在fm：form中导致