标签：put frame tle turn mod port pre inf 登录
org.springframework.web.bind.annotation.ModelAttribute注解类型将请求参数绑定到Model对象。
@ModelAttribute注解只支持一个属性value，类型为String，表示绑定的属性名称。
提示：被@ModelAttribute注释的方法会在Controller每个方法执行前被执行，因此在一个Controller映射到多个URL时，要谨慎使用。
index.jsp
用于展示调用关于@ModelAttribute注解不同的使用方法。
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>$Title$</title>
</head>
<body>
<h3>测试@ModelAttribute</h3>
<a href="loginForm1">测试@ModelAttribute(value="")注释返回具体类的方法</a>
<a href="loginForm2">测试@ModelAttribute注释void返回值的方法</a>
<a href="loginForm3">测试@ModelAttribute注释返回具体类的方法</a>
<a href="loginForm4">测试@ModelAttribute和@RequestMapping同时注释一个方法</a>
<a href="loginForm5">测试@ModelAttribute注释一个方法的参数</a>
</body>
</html>
FormController
用于接受index.jsp页,a标签(超链接)传递的地址。
@Controller
public class FormController {
@RequestMapping(value = "/{formName}")
public String loginForm(@PathVariable String formName){
return formName;
}
}loginForm1.jsp
<html>
<head>
<title>Title</title>
</head>
<body>
<h3>测试@ModelAttribute(value="")注释返回具体类的方法 </h3>
<form action="login111" method="post">
<label for="loginName">登录名：</label><input type="text" id="loginName" name="loginName">
<input type="submit">
</form>
</body>
</html>ModelAttribute1Controller
package com.wen.controller;
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.RequestParam;
@Controller
public class ModelAttribute1Controller {
//使用@ModelAttribute注释的value属性，来指定model属性的名称，model属性的值就是方法的返回值
@ModelAttribute("loginName")
public String userModel1(
@RequestParam("loginName") String loginName){
return loginName;
}
@RequestMapping(value = "/login111")
public String login111(){
return "result1";
}
}
result1.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
${requestScope.loginName}
</body>
</html>loginForm2.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<h3>测试@ModelAttribute注释void返回值的方法</h3>
<form action="login222" method="post">
<label for="loginName">登录名：</label><input type="text" id="loginName" name="loginName">
<label for="password">密码：</label><input type="password" id="password" name="password">
<input type="submit" value="登录">
</form>
</body>
</html>ModelAttribute2Controller
package com.wen.controller;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
@Controller
public class ModelAttribute2Controller {
//model属性名称和值由model.addAttribute()实现，前提是要在方法中加入图个Model类型的参数
@ModelAttribute
public void userModel2(
@RequestParam("loginName") String loginName,
@RequestParam("password") String password,
Model model) {
model.addAttribute("loginName", loginName);
model.addAttribute("password", password);
}
@RequestMapping(value = "/login222")
public String login222(){
return "result2";
}
}
result2.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
${requestScope.loginName}
${requestScope.password}
</body>
</html>loginForm3.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<h3>测试@ModelAttribute注释返回具体类的方法</h3>
<form action="login333" method="post">
<label for="loginName">登录名：</label><input type="text" id="loginName" name="loginName">
<label for="password">密码：</label><input type="password" id="password" name="password">
<input type="submit" value="登录">
</form>
</body>
</html>
</body>
</html>
ModelAttribute3Controller
package com.wen.controller;
import com.wen.domain.User;
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.RequestParam;
import java.util.ArrayList;
import java.util.List;
@Controller
public class ModelAttribute3Controller {
//静态List<User>集合，此处代替数据库用来保存注册的用户信息
private static List<User> userList;
//此构造器，初始化List<User>集合
public ModelAttribute3Controller() {
super();
userList = new ArrayList<>();
User user1 = new User("test", "123");
User user2 = new User("admin", "456");
userList.add(user1);
userList.add(user2);
}
//根据登录名和密码查询用户，用户存在返回用户信息的User对象，不存在返回null
private User find(String loginName, String password) {
for (User user : userList) {
if (user.getName().equals(loginName) && user.getPwd().equals(password)) {
return user;
}
}
return null;
}
//model属性的名称没有被锁定，它由返回类型隐含表示，如这个方法返回User类型，
//那么这个model属性的名称就是user
@ModelAttribute
public User userModel3(
@RequestParam("loginName") String loginName,
@RequestParam("password") String password) {
return find(loginName, password);
}
@RequestMapping(value = "/login333")
public String login333() {
return "result3";
}
}
result3.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
${requestScope.user.name}
</body>
</html>loginForm4.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<body>
<h3>测试@ModelAttribute注释void返回值的方法</h3>
<form action="login444" method="post">
<label for="loginName">登录名：</label><input type="text" id="loginName" name="loginName">
<label for="password">密码：</label><input type="password" id="password" name="password">
<input type="submit" value="登录">
</form>
</body>
</body>
</html>ModelAttribute4Controller
package com.wen.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
public class ModelAttribute4Controller {
/**
* 视图名称是@RequestMapping的value值——"/login444",即跳转结果
*
* @return model属性名称就是value的值
*/
@RequestMapping(value = "/login444")
@ModelAttribute(value = "username")
public String login444() {
return "admin";
}
}
login444.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
${requestScope.username}
</body>
</html>
loginForm5.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<body>
<h3>测试@ModelAttribute注释一个方法的参数</h3>
<form action="login555" method="post">
<label for="loginName">登录名：</label><input type="text" id="loginName" name="loginName">
<label for="password">密码：</label><input type="password" id="password" name="password">
<input type="submit" value="登录">
</form>
</body>
</body>
</html>ModelAttribute5Controller
package com.wen.controller;
import com.wen.domain.User;
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.RequestParam;
@Controller
public class ModelAttribute5Controller {
//model的属性名称就是value的值，即"user"，model属性对象就是方法的返回值
@ModelAttribute("user")
public User userModel5(
@RequestParam("loginName") String loginName,
@RequestParam("password") String password){
User user =new User();
user.setName(loginName);
user.setPwd(password);
return user;
}
@RequestMapping(value = "/login555")
public String login555(@ModelAttribute("user") User user){
user.setName("管理员");
return "result5";
}
}
result5.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
${requestScope.user.name}
</body>
</html>Tips：@ModelAttribute注解的使用的方法有很多种，非常灵活，我们可以根据业务需求选择使用。
标签：put frame tle turn mod port pre inf 登录
原文地址：https://www.cnblogs.com/guowenrui/p/10363583.html
