spring mvc: 密码框

以user为例，包含username, password字段.

user.java

public class User {

   private String username;
   private String password;

   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;
   }
}

UserController.java代码

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() {
      return new ModelAndView("user_index", "command", new User());
   }

   @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());

      return "user_add";
   }
}

这里的第一个服务方法user()，我们已经在ModelAndView对象中传递了一个名称为“command”的空User对象，因为如果在JSP文件中使用<form:form>标签，spring框架需要一个名称为“command”的对象。所以当调用user()方法时，它返回user.jsp视图。

第二个服务方法addUser()将根据URL => HelloWeb/addUser 上的POST方法请求时调用。根据提交的信息准备模型对象。最后从服务方法返回“userlist”视图，这将呈现userlist.jsp视图。

user_index.jsp 的代码如下所示

<%@ page language="java" contentType="text/html; charset=utf-8"    pageEncoding="utf-8"%>
<%@ taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
<!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>添加user信息</title>
</head>
<body>

<form:form method="post" action="/hello/addUser">
<table>
	<tr>
		<td><form:label path="username">姓名:</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 colspan="2">
			<input type="submit" value="提交表单"/>
		</td>
	</tr>
</table>
</form:form>

</body>
</html>

　　user_add.jsp

<%@ 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>
</table>


</body>
</html>

如图：