Spring 向页面传值以及接受页面传过来的参数的方式

一、从页面接收参数

Spring MVC接收请求提交的参数值的几种方法：

使用HttpServletRequest获取。

 @RequestMapping("/login.do")  
public String login(HttpServletRequest request){  String name = request.getParameter("name")  String pass = request.getParameter("pass")  
}

使用@RequestParam注解。

    @RequestMapping("/login.do")  public String login(HttpServletRequest request,  String name,  @RequestParam("pass")String password) // 表单属性是pass,用变量password接收  {  syso(name);  syso(password)  }

使用自动机制封装成实体参数

    <form action="login.do">  用户名：<input name="name"/>  密码：<input name="pass"/>  <input type="submit" value="登陆">  </form>  //封装的User类  public class User{  private String name;  private String pass;  }

    @RequestMapping("/login.do")  public String login(User user)  {  syso(user.getName());  syso(user.getPass());  }

二、向页面传值

当Controller组件处理后，需要向响应JSP传值时，可以使用的方法:

1)，使用HttpServletRequest 和 Session 然后setAttribute()，就和Servlet中一样

Model数据会利用HttpServletRequest的Attribute传值到success.jsp中

    @RequestMapping("/login.do")  public ModelAndView  login(String name,String pass){  User user = userService.login(name,pwd);  Map<String,Object> data = new HashMap<String,Object>();  data.put("user",user);  return new ModelAndView("success",data);  }

2)，使用ModelAndView对象

3)，使用ModelMap对象

使用ModelMap参数对象示例:

ModelMap数据会利用HttpServletRequest的Attribute传值到success.jsp中

    @RequestMapping("/login.do")  public　String login(String name,String pass ,ModelMap model){  User user  = userService.login(name,pwd);  model.addAttribute("user",user);  model.put("name",name);  return "success";  }

4)，使用@ModelAttribute注解

使用@ModelAttribute示例

在Controller方法的参数部分或Bean属性方法上使用

@ModelAttribute数据会利用HttpServletRequest的Attribute传值到success.jsp中

    @RequestMapping("/login.do")  public String login(@ModelAttribute("user") User user){  //TODO  return "success";  }  @ModelAttribute("name")  public String getName(){  return name;  }

5）Session存储：可以利用HttpServletReequest的getSession()方法

    @RequestMapping("/login.do")  public String login(String name,String pwd  ModelMap model,HttpServletRequest request){  User user = serService.login(name,pwd);  HttpSession session = request.getSession();  session.setAttribute("user",user);  model.addAttribute("user",user);  return "success";  }

6）自定义Map

@ResponseBody@RequestMapping(value = "/updatestatus", method = RequestMethod.POST)public Map<String, Object> updateStatus(HttpServletRequest request) {Map<String, Object> result = new HashMap<String, Object>();String id = request.getParameter("id");SystemAdministrator sysadmin=systemAdminBiz.get(Integer.valueOf(id));sysadmin.setStatus(1);boolean    flag = systemAdminBiz.update(sysadmin);result.put("status", flag);return result;}

@RequestMapping(value = "/list", method = {RequestMethod.POST,RequestMethod.GET})public String queryAdministrator(HttpServletRequest request,ModelMap model) {Integer roleId = request.getParameter("roleListById") == null ? 0 : Integer.parseInt(request.getParameter("roleListById"));Map<String, Object> properties = new HashMap<String, Object>();if(roleId.intValue() > 0) {properties.put("role:=", roleId);model.put("roleId", roleId);}List<SystemAdministrator> administrator = systemAdminBiz.find(properties);List<SystemRole> systemRole = systemRoleBiz.getAll();model.put("administratorList", administrator);model.put("roleList", systemRole);return "sys_admin_list";}

7）Spring MVC 默认采用的是转发来定位视图，如果要使用重定向，可以如下操作

1，使用RedirectView

2，使用redirect:前缀

    public ModelAndView login(){  RedirectView view = new RedirectView("regirst.do");  return new ModelAndView(view);  }

或者用如下方法，工作中常用的方法：

 public String login(){  //TODO  return "redirect:regirst.do";  
}

三、实例讲解：

步骤一：创建新Web项目，导入Spring MVC包和业务层UserService

1. 创建Web项目导入相关的jar包：

2. 导入前述业务层UserService类以及依赖的类，等。

User类代码如下：

package com.souvc.entity;import java.io.Serializable;public class User implements Serializable {private static final long serialVersionUID = -603439325380668432L;private int id;private String name;private String pwd;private String phone;public User() {}public User(int id, String name, String pwd, String phone) {this.id = id;this.name = name;this.pwd = pwd;this.phone = phone;}public User(String name, String pwd, String phone) {super();this.name = name;this.pwd = pwd;this.phone = phone;}public int getId() {return id;}public void setId(int id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getPwd() {return pwd;}public void setPwd(String pwd) {this.pwd = pwd;}public String getPhone() {return phone;}public void setPhone(String phone) {this.phone = phone;}@Overridepublic int hashCode() {return id;}@Overridepublic boolean equals(Object obj) {if (this == obj)return true;if (obj == null)return false;if (obj instanceof User) {User o = (User) obj;return this.id == o.id;}return true;}@Overridepublic String toString() {return id + "," + name + "," + pwd + "," + phone;}
}

UserDao接口代码如下：

package com.souvc.dao;import com.souvc.entity.User;/*** 用户数据访问对象接口*/
public interface UserDao {/** 根据唯一用户名查询系统用户, 如果没有找到用户信息返回null */public User findByName(String name);// public User add(String name, String pwd, String phone);// public User find(int id);// public User delete(int id);// public void update(User user);
}

UserService类代码如下：

package com.souvc.service;import java.io.Serializable;import javax.annotation.Resource;import org.springframework.stereotype.Service;import com.souvc.dao.UserDao;
import com.souvc.entity.User;/** 业务层 注解 */
@Service
// 默认的Bean ID是 userService
public class UserService implements Serializable {private static final long serialVersionUID = 7360372166489952236L;private UserDao userDao;// @Resource //自动匹配userDao对象并注入@Resource(name = "userDao")public void setUserDao(UserDao userDao) {this.userDao = userDao;//}public UserDao getUserDao() {return userDao;}/** 登录系统功能 */public User login(String name, String pwd) throws NameOrPwdException,NullParamException {if (name == null || name.equals("") || pwd == null || pwd.equals("")) {throw new NullParamException("登录参数不能为空！");}User user = userDao.findByName(name);if (user != null && pwd.equals(user.getPwd())) {return user;}throw new NameOrPwdException("用户名或者密码错误");}
}

NameOrPwdException类代码如下：

package com.souvc.service;/** 用户名或者密码错误 */
public class NameOrPwdException extends Exception {public NameOrPwdException() {}public NameOrPwdException(String message) {super(message);}public NameOrPwdException(Throwable cause) {super(cause);}public NameOrPwdException(String message, Throwable cause) {super(message, cause);}
}

NullParamException类代码如下：

package com.souvc.service;/** 参数为空 */
public class NullParamException extends Exception {public NullParamException() {}public NullParamException(String message) {super(message);}public NullParamException(Throwable cause) {super(cause);}public NullParamException(String message, Throwable cause) {super(message, cause);}
}

JdbcDataSource类代码如下：

package com.souvc.dao;import java.io.Serializable;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;/** 组件注解 */
@Component
public class JdbcDataSource implements Serializable {private static final long serialVersionUID = -8925981939329398101L;private String driver;@Value("#{jdbcProps.url}")private String url;@Value("#{jdbcProps.user}")private String user;@Value("#{jdbcProps.pwd}")private String pwd;public String getDriver() {return driver;}/** 必须使用Bean属性输入, 否则不能进行JDBC Driver注册 */@Value("#{jdbcProps.driver}")public void setDriver(String driver) {try {// 注册数据库驱动Class.forName(driver);this.driver = driver;} catch (Exception e) {throw new RuntimeException(e);}}public String getUrl() {return url;}public void setUrl(String url) {this.url = url;}public String getUser() {return user;}public void setUser(String user) {this.user = user;}public String getPwd() {return pwd;}public void setPwd(String pwd) {this.pwd = pwd;}public Connection getConnection() throws SQLException {Connection conn = DriverManager.getConnection(url, user, pwd);return conn;}public void close(Connection conn) {if (conn != null) {try {conn.close();} catch (SQLException e) {e.printStackTrace();}}}
}

MysqlUserDao类代码如下：

package com.souvc.dao;import java.io.Serializable;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Repository;import com.souvc.entity.User;/** 持久层 注解 */
@Repository("userDao")
// 指定特定的Bean ID 方便setUserDao注入
public class MysqlUserDao implements UserDao, Serializable {private static final long serialVersionUID = 7385842613248394287L;private JdbcDataSource dataSource;public MysqlUserDao() {}/** 创建 MysqlUserDAO 对象必须依赖于JDBCDataSource实例 */public MysqlUserDao(JdbcDataSource dataSource) {this.dataSource = dataSource;}@Autowired// 按照类型自动装配public void setDataSource(@Qualifier("jdbcDataSource")JdbcDataSource dataSource) {this.dataSource = dataSource;}public JdbcDataSource getDataSource() {return dataSource;}/** 根据唯一用户名查询系统用户, 如果没有找到用户信息返回null */public User findByName(String name) {System.out.println("利用JDBC技术查找User信息");String sql = "select id, name, pwd, phone  from users where name=?";Connection conn = null;try {conn = dataSource.getConnection();PreparedStatement ps = conn.prepareStatement(sql);ps.setString(1, name);ResultSet rs = ps.executeQuery();User user = null;while (rs.next()) {user = new User();user.setId(rs.getInt("id"));user.setName(rs.getString("name"));user.setPwd(rs.getString("pwd"));user.setPhone(rs.getString("phone"));}rs.close();ps.close();return user;} catch (SQLException e) {e.printStackTrace();throw new RuntimeException(e);} finally {dataSource.close(conn);}}
}

db.properties文件内容如下：

# config for Mysql
driver=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/souvc
user=root
pwd=123456

spring-mvc.xml文件代码如下：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:context="http://www.springframework.org/schema/context"xmlns:jdbc="http://www.springframework.org/schema/jdbc"xmlns:jee="http://www.springframework.org/schema/jee"xmlns:tx="http://www.springframework.org/schema/tx"xmlns:jpa="http://www.springframework.org/schema/data/jpa"xmlns:util="http://www.springframework.org/schema/util"xmlns:mvc="http://www.springframework.org/schema/mvc"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsdhttp://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.2.xsdhttp://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.2.xsdhttp://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsdhttp://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.3.xsdhttp://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.2.xsdhttp://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd"><util:properties id="jdbcProps" location="classpath:db.properties" /><context:component-scan base-package="com.souvc" /><!-- 视图处理 --><bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"><property name="prefix" value="/WEB-INF/jsp/"></property><property name="suffix" value=".jsp"></property></bean>
</beans>

Mysql数据库初始化SQL代码如下：

DROP TABLE users;
CREATE TABLE USERS 
(ID DOUBLE(7, 0) , NAME VARCHAR(50) , PWD VARCHAR(50), PHONE VARCHAR(50) ,PRIMARY KEY (id));INSERT INTO Users (id, NAME, pwd, phone) VALUES (1, 'Tom', '123', '110');
INSERT INTO Users (id, NAME, pwd, phone) VALUES (2, 'Jerry', 'abc', '119');
INSERT INTO Users (id, NAME, pwd, phone) VALUES (3, 'Andy', '456', '112');

3. 为项目添加JUnit4 API，然后添加测试类TestCase和测试方法testUserService()用于测试上述配置是否正确。TestCase类代码如下：

package com.souvc.test;import java.util.Properties;import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;import com.souvc.dao.JdbcDataSource;
import com.souvc.entity.User;
import com.souvc.service.UserService;public class TestCase {@Testpublic void testUserService() throws Exception {String cfg = "spring-mvc.xml";ApplicationContext ac = new ClassPathXmlApplicationContext(cfg);Properties obj = ac.getBean("jdbcProps", Properties.class);JdbcDataSource ds = ac.getBean("jdbcDataSource", JdbcDataSource.class);System.out.println(obj);System.out.println(ds);System.out.println(ds.getConnection());UserService service = ac.getBean("userService", UserService.class);User user = service.login("Tom", "123");System.out.println(user);}
}

执行测试方法testUserService(),在控制台输出的结果:

{user=root, url=jdbc:mysql://localhost:3306/souvc, driver=com.mysql.jdbc.Driver, pwd=123456}
com.souvc.dao.JdbcDataSource@1cb1a4e2
com.mysql.jdbc.JDBC4Connection@3d04fc23
利用JDBC技术查找User信息
1,Tom,123,110

这个结果说明业务层UserService工作正常。

4. 配置Spring MVC 核心控制器DispatcherServlet到web.xml。web.xml配置部分代码参考如下：

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"><welcome-file-list><welcome-file>index.jsp</welcome-file></welcome-file-list><servlet><servlet-name>springmvc</servlet-name><servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class><init-param><param-name>contextConfigLocation</param-name><param-value>classpath:spring-mvc.xml</param-value></init-param><load-on-startup>1</load-on-startup></servlet><servlet-mapping><servlet-name>springmvc</servlet-name><url-pattern>*.form</url-pattern></servlet-mapping></web-app>

5. 部署项目到Tomcat并且启动，测试Spring MVC配置是否正常。

在输出结果中出现内容，并且没有异常就会说明Spring MVC部署正常。

步骤二：实现login-action1.form登录流程，测试利用HttpServletRequrst传值方法

1. 在WEB-INF/jsp文件夹下添加login-form.jsp文件，代码如下所示：

<%@ page pageEncoding="utf-8" contentType="text/html; charset=utf-8"%>
<!DOCTYPE HTML>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<c:url var="base" value="/"></c:url>
<html><head><title>Login Form</title><link rel="stylesheet" type="text/css" href="${base}styles.css"></head><body><h6>${message}</h6><form method="post" action="${base}login/login-action1.form"><div><h2>登录 login-action1.form</h2><p><label>用户</label><input type="text" name="name"></p><p><label>密码</label><input type="password" name="pwd"></p><h3><input type="submit" value="登录"></h3></div></form><form method="post" action="${base}login/login-action2.form"><div><h2>登录 login-action2.form</h2><p><label>用户</label><input type="text" name="name"></p><p><label>密码</label><input type="password" name="pwd"></p><h3><input type="submit" value="登录"></h3></div></form><form method="post" action="${base}login/login-action3.form"><div><h2>登录 login-action3.form</h2><p><label>用户</label><input type="text" name="name"></p><p><label>密码</label><input type="password" name="pwd"></p><h3><input type="submit" value="登录"></h3></div></form><form method="post" action="${base}login/login-action4.form"><div><h2>登录 login-action4.form</h2><p><label>用户</label><input type="text" name="name"></p><p><label>密码</label><input type="password" name="pwd"></p><h3><input type="submit" value="登录"></h3></div></form><form method="post" action="${base}login/login-action5.form"><div><h2>登录 login-action5.form</h2><p><label>用户</label><input type="text" name="name"></p><p><label>密码</label><input type="password" name="pwd"></p><h3><input type="submit" value="登录"></h3></div></form><form method="post" action="${base}login/login-action6.form"><div><h2>登录 login-action6.form</h2><p><label>用户</label><input type="text" name="name"></p><p><label>密码</label><input type="password" name="pwd"></p><h3><input type="submit" value="登录"></h3></div></form></body></html>

方法一解释：

利用HttpServletRequest对象进行浏览器页面到控制器传值。

方法二解释：

使用@RequestParam注解声明表单密码输入框pwd的值注入到password变量，表单中用户名输入框根据名字映自动射注入name变量。 @RequestMapping注解将login-action2.form映射到了checkLogin2()方法。这样就与login- form.jsp表单对应。

方法三解释：

这里采用user作为参数， Spring会自动的将页面表单参数name，pwd注入到user对象的相应属性name,pwd传递到方法中。@RequestMapping将请求login-action3.form映射到方法checkLogin3()。

方法四解释：

在处理方法完成后返回一个ModelAndView对象。

方法五解释：

ModelMap属性值与页面login-form.jsp之间的数据对应。

方法六解释：

@ModelAttribute声明的属性与login-form.jsp页面的值关系。

用户名或者密码错误时候出现的时候，能够记住用户名。

在前述案例中，用户登录成功以后，可以利用HttpServletRequest对象的getSession()方法访问Session对象，这样就可以保持用户登录状态了。

2. 为页面添加样式文件styles.css，样式文件保存在WebRoot文件夹下，styles.css文件代码如下所示：

* {margin: 0;padding: 0;
}h6 {text-align: center;color: red;padding: 10px;font-size: 14px;
}form {padding: 10px;float: left;
}form div {border: 1px gray solid;width: 320px;padding: 8px;
}form p input {width: 180px
}form h2 input {text-align: center;
}form h2 {background: black;color: white;padding: 4px;
}form p {background: #ddd;padding: 4px 8px 0 8px;
}form h3 {background: #ddd;padding: 8px;
}

3. 在WEB-INF/jsp文件夹下添加success.jsp文件，这个文件是登录成功以后显示的界面，代码如下所示：

<%@ page pageEncoding="utf-8" contentType="text/html; charset=utf-8"%>
<!DOCTYPE HTML>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<c:url var="base" value="/"></c:url>
<html><head><title>Success</title><link rel="stylesheet" type="text/css" href="${base}styles.css"></head><body><h6>${user.name}登录成功！</h6></body>
</html>

上述页面中，使用EL表达式和标准标签库配合显示界面数据，其中<c:url var="base" value="/"></c:url>和${base}用于解决绝对路径问题。

4. 创建控制器类LoginController，在该类中使用注解@Controller的方式进行配置：

1）使用@Controller将LoginController声明为控制器Bean组件。

2）使用@RequestMapping("/login")声明对LoginController组件的请求在/login 路径下。

3）流程控制方法loginForm()，用于显示登录表单页面。使用@RequestMapping注解将映射请求/login-form.form到loginForm()方法。

4）增加userService属性，并且使用@Resource注解声明在运行期间注入userService对象。

5）增加控制流程方法checkLogin1()，使用@RequestMapping注解将请求/login-action1.form映射到checkLogin1()方法。checkLogin1()方法调用userService的login方法，实现登录流程。 checkLogin1()方法主要是测试JSP页面到控制器的数据传输方式。

LoginController类代码如下所示：

package com.souvc.controller;import java.util.HashMap;
import java.util.Map;
import java.util.Random;import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.servlet.ModelAndView;import com.souvc.entity.User;
import com.souvc.service.NameOrPwdException;
import com.souvc.service.NullParamException;
import com.souvc.service.UserService;@Controller
//@SessionAttributes("user")
@RequestMapping("/login")
public class LoginController {@Resource// 请求Spring注入资源 userServiceprivate UserService userService;@RequestMapping("/login.form")public String loginForm() {// 可以向表单界面传递一些参数return "login-form";}@RequestMapping("/login-action1.form")// Spring MVC 自动参数注入HttpServletRequestpublic String checkLogin1(HttpServletRequest req) {System.out.println("---方法一---");// 优点直接简洁，缺点需要自己处理数据类型转换， 不支持文件上传功能String name = req.getParameter("name");String pwd = req.getParameter("pwd");System.out.println(name);System.out.println(pwd);try {User user = userService.login(name, pwd);// 登录成功将登录用户信息保存到当前会话中req.getSession().setAttribute("user", user);return "success";} catch (NameOrPwdException e) {e.printStackTrace();req.setAttribute("message", e.getMessage());return "login-form";} catch (NullParamException e) {e.printStackTrace();req.setAttribute("message", e.getMessage());return "redirect:login.form";} catch (RuntimeException e) {e.printStackTrace();req.setAttribute("message", e.getMessage());return "error";}}@RequestMapping("/login-action2.form")public String checkLogin2(String name, @RequestParam("pwd")String password, // 映射表单属性不同的参数HttpServletRequest req) {System.out.println("---方法二---");// 优点， 自动转换数据类型， 缺点可能出现数据类型转换异常System.out.println(name);System.out.println(password);try {User user = userService.login(name, password);// 登录成功将登录用户信息保存到当前会话中req.getSession().setAttribute("user", user);return "success";} catch (NameOrPwdException e) {e.printStackTrace();req.setAttribute("message", e.getMessage());return "login-form";} catch (NullParamException e) {e.printStackTrace();req.setAttribute("message", e.getMessage());return "login-form";} catch (RuntimeException e) {e.printStackTrace();req.setAttribute("message", e.getMessage());return "error";}}@RequestMapping("/login-action3.form")public String checkLogin3(User user, HttpServletRequest req) {System.out.println("---方法三---");// 自动填充到bean对象System.out.println(user);try {user = userService.login(user.getName(), user.getPwd());// 登录成功将登录用户信息保存到当前会话中req.getSession().setAttribute("user", user);return "success";} catch (NameOrPwdException e) {e.printStackTrace();req.setAttribute("message", e.getMessage());return "login-form";} catch (NullParamException e) {e.printStackTrace();req.setAttribute("message", e.getMessage());return "login-form";} catch (RuntimeException e) {e.printStackTrace();req.setAttribute("message", e.getMessage());return "error";}}@RequestMapping("/login-action4.form")public ModelAndView checkLogin4(String name, String pwd,HttpServletRequest req) {System.out.println("---方法四---");Map<String, Object> data = new HashMap<String, Object>();try {User user = userService.login(name, pwd);// 登录成功将登录用户信息保存到当前会话中req.getSession().setAttribute("user", user);return new ModelAndView("success", data);} catch (NameOrPwdException e) {e.printStackTrace();data.put("message", e.getMessage());return new ModelAndView("login-form", data);} catch (NullParamException e) {e.printStackTrace();data.put("message", e.getMessage());return new ModelAndView("login-form", data);} catch (RuntimeException e) {e.printStackTrace();data.put("message", e.getMessage());return new ModelAndView("error", data);}}@RequestMapping("/login-action5.form")public String checkLogin5(String name, String pwd, ModelMap model,HttpServletRequest req) {System.out.println("---方法五---");try {User user = userService.login(name, pwd);// 登录成功将登录用户信息保存到当前会话中req.getSession().setAttribute("user", user);return "success";} catch (NameOrPwdException e) {e.printStackTrace();model.addAttribute("message", e.getMessage());return "login-form";} catch (NullParamException e) {e.printStackTrace();model.addAttribute("message", e.getMessage());return "login-form";} catch (RuntimeException e) {e.printStackTrace();model.addAttribute("message", e.getMessage());return "error";}}@RequestMapping("/login-action6.form")public String checkLogin6(@ModelAttribute("name") String name, @ModelAttribute("password") String pwd,ModelMap model, HttpServletRequest req){System.out.println("---方法六---");try {User user = userService.login(name, pwd);// 登录成功将登录用户信息保存到当前会话中req.getSession().setAttribute("user", user);return "success";} catch (NameOrPwdException e) {e.printStackTrace();model.addAttribute("message", e.getMessage());return "login-form";} catch (NullParamException e) {e.printStackTrace();model.addAttribute("message", e.getMessage());return "login-form";} catch (RuntimeException e) {e.printStackTrace();model.addAttribute("message", e.getMessage());return "error";}}@RequestMapping("/login-action7.form")public String checkLogin7(ModelMap model, HttpServletRequest req) {System.out.println("---方法七---");String name1=req.getParameter("name");String pwd1=req.getParameter("pwd");try {User user = userService.login(name1, pwd1);// 登录成功将登录用户信息保存到当前会话中req.getSession().setAttribute("user", user);return "success";} catch (NameOrPwdException e) {e.printStackTrace();model.addAttribute("message", e.getMessage());return "redirect：login";} catch (NullParamException e) {e.printStackTrace();model.addAttribute("message", e.getMessage());return "redirect：login";} catch (RuntimeException e) {e.printStackTrace();model.addAttribute("message", e.getMessage());return "error";}}private String[] msg = { "再来一次", "下次就对了", "没关系还有机会" };@ModelAttribute("next")public String getNext() {Random r = new Random();return msg[r.nextInt(msg.length)];}}

5.测试login-action1.form登录流程

通过网址“http://localhost:8080/SpringValues/login/login.form”请求Tomcat服务器：

访问请求的信息打印在控制台：

---方法一---
Tom
123
利用JDBC技术查找User信息
---方法二---
Tom
123
利用JDBC技术查找User信息
---方法三---
0,Tom,123,null
利用JDBC技术查找User信息
---方法四---
利用JDBC技术查找User信息
---方法五---
利用JDBC技术查找User信息