spring mvc：复选框（多选）
以user为例，user下有 username用户，password密码, address地址, receivePaper是否订阅, favotireFramework兴趣爱好,
user.java
public class User {
private String username;
private String password;
private String address;
private boolean receivePaper;
private String [] favoriteFrameworks;
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public boolean isReceivePaper() {
return receivePaper;
}
public void setReceivePaper(boolean receivePaper) {
this.receivePaper = receivePaper;
}
public String[] getFavoriteFrameworks() {
return favoriteFrameworks;
}
public void setFavoriteFrameworks(String[] favoriteFrameworks) {
this.favoriteFrameworks = favoriteFrameworks;
}
}
userController.java
import java.util.ArrayList;
import java.util.List; import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.ui.ModelMap; @Controller
public class UserController { @RequestMapping(value = "/user", method = RequestMethod.GET)
public ModelAndView user() {
User user = new User();
user.setFavoriteFrameworks((new String []{"Spring MVC","Struts 2"}));
user.setGender("M");
ModelAndView modelAndView = new ModelAndView("user", "command", user);
return modelAndView;
} @RequestMapping(value = "/addUser", method = RequestMethod.POST)
public String addUser(@ModelAttribute("SpringWeb")User user,
ModelMap model) {
model.addAttribute("username", user.getUsername());
model.addAttribute("password", user.getPassword());
model.addAttribute("address", user.getAddress());
model.addAttribute("receivePaper", user.isReceivePaper());
model.addAttribute("favoriteFrameworks", user.getFavoriteFrameworks());
model.addAttribute("gender", user.getGender());
return "userlist";
} @ModelAttribute("webFrameworkList")
public List<String> getWebFrameworkList()
{
List<String> webFrameworkList = new ArrayList<String>();
webFrameworkList.add("Spring MVC");
webFrameworkList.add("Spring Boot");
webFrameworkList.add("Struts 2");
webFrameworkList.add("Apache Hadoop");
return webFrameworkList;
}
}
现在对userController.java进行说明:
public List<String> getWebFrameworkList()这一项是多选复选框的所有选项 ,@ModelAttribute("webFrameworkList")中的webFrameworkList是jsp页面中可以自己调用的属性变量.
而public ModelAndView user()代码块中的:
User user = new User();
user.setFavoriteFrameworks((new String []{"Spring MVC","Struts 2"}));
是默认勾选选。即一打开页面，Spring MVC合影Struts 2就好被勾选.
user.jsp
<%@ page contentType="text/html; charset=UTF-8"%>
<%@taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
<html>
<head>
<title>Spring MVC表单处理(单选框)</title>
</head>
<body> <h2>用户信息 - </h2>
<form:form method="POST" action="/RadioButton/addUser">
<table>
<tr>
<td><form:label path="username">用户名：</form:label></td>
<td><form:input path="username" /></td>
</tr>
<tr>
<td><form:label path="password">密码：</form:label></td>
<td><form:password path="password" /></td>
</tr>
<tr>
<td><form:label path="address">地址：</form:label></td>
<td><form:textarea path="address" rows="5" cols="30" /></td>
</tr>
<tr>
<td><form:label path="receivePaper">订阅新闻？</form:label></td>
<td><form:checkbox path="receivePaper" /></td>
</tr>
<tr>
<td><form:label path="favoriteFrameworks">喜欢的技术</form:label></td>
<td><form:checkboxes items="${webFrameworkList}" path="favoriteFrameworks" /></td>
</tr>
<tr>
<td colspan="2">
<input type="submit" value="提交"/>
</td>
</tr>
</table>
</form:form>
</body>
</html>
userlist.jsp代码
<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%>
<%@ taglib uri="http://www.springframework.org/tags/form" prefix="form" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ page isELIgnored="false" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>用户信息显示</title>
</head>
<body> <table>
<tr>
<td>用户名</td>
<td>${username}</td>
</tr>
<tr>
<td>密码</td>
<td>${password}</td>
</tr>
<tr>
<td>地址</td>
<td>${address}</td>
</tr>
<tr>
<td>是否订阅</td>
<td>${receivePaper}</td>
</tr>
<tr>
<td>喜欢的技术</td>
<td>
<%
String[] favoriteFrameworks = (String[])request.getAttribute("favoriteFrameworks");
for(String framework: favoriteFrameworks)
{
out.println(framework);
}
%>
</td>
</tr> </table> </body>
</html>
注：解析变量一定要有一下标识：
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ page isELIgnored="false" %>
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