Spring向页面传值和接受页面传过来的参数详解

网友投稿 274 2023-05-09


Spring向页面传值和接受页面传过来的参数详解

本文主要给大家介绍了关于Spring向页面传值和接受页面传过来的参数的相关内容,分享出来供大家参考学习,下面来一起看看详细的介绍:

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:

1、使用HttpServletRequest获取。

@RequestMapping("/login.do")

public String login(HttpServletRequest request){

String name = request.getParameter("name")

String pass = request.getParameter("pass")

}

2、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)

}

3、使用自动机制封装成实体参数。

用户名:

密码:

//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 data = new HashMap();

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 updateStatus(HttpServletRequest request) {

Map result = new HashMap();

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 properties = new HashMap();

if(roleId.intValue() > 0) {

properties.put("role:=", roleId);

model.put("roleId", roleId);

}

List administrator = systemAdminBiz.find(properties);

List 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;

}

@Override

public int hashCode() {

return id;

}

@Override

public 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;

}

@Override

public 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:

xmlns:xsi="http://w3.org/2001/XMLSchema-instance"

xmlns:context="http://springframework.org/schema/context"

xmlns:jdbc="http://springframework.org/schema/jdbc"

xmlns:jee="http://springframework.org/schema/jee"

xmlns:tx="http://springframework.org/schema/tx"

xmlns:jpa="http://springframework.org/schema/data/jpa"

xmlns:util="http://springframework.org/schema/util"

xmlns:mvc="http://springframework.org/schema/mvc"

xsi:schemaLocation="

http://springframework.org/schema/beans http://springframework.org/schema/beans/spring-beans-3.2.xsd

http://springframework.org/schema/context http://springframework.org/schema/context/spring-context-3.2.xsd

http://springframework.org/schema/jdbc http://springframework.org/schema/jdbc/spring-jdbc-3.2.xsd

http://springframework.org/schema/jee http://springframework.org/schema/jee/spring-jee-3.2.xsd

http://springframework.org/schema/tx http://springframework.org/schema/tx/spring-tx-3.2.xsd

http://springframework.org/schema/data/jpa http://springframework.org/schema/data/jpa/spring-jpa-1.3.xsd

http://springframework.org/schema/util http://springframework.org/schema/util/spring-util-3.2.xsd

http://springframework.org/schema/mvc http://springframework.org/schema/mvc/spring-mvc-3.2.xsd">

xmlns:xsi="http://w3.org/2001/XMLSchema-instance"

xmlns:context="http://springframework.org/schema/context"

xmlns:jdbc="http://springframework.org/schema/jdbc"

xmlns:jee="http://springframework.org/schema/jee"

xmlns:tx="http://springframework.org/schema/tx"

xmlns:jpa="http://springframework.org/schema/data/jpa"

xmlns:util="http://springframework.org/schema/util"

xmlns:mvc="http://springframework.org/schema/mvc"

xsi:schemaLocation="

http://springframework.org/schema/beans http://springframework.org/schema/beans/spring-beans-3.2.xsd

http://springframework.org/schema/context http://springframework.org/schema/context/spring-context-3.2.xsd

http://springframework.org/schema/jdbc http://springframework.org/schema/jdbc/spring-jdbc-3.2.xsd

http://springframework.org/schema/jee http://springframework.org/schema/jee/spring-jee-3.2.xsd

http://springframework.org/schema/tx http://springframework.org/schema/tx/spring-tx-3.2.xsd

http://springframework.org/schema/data/jpa http://springframework.org/schema/data/jpa/spring-jpa-1.3.xsd

http://springframework.org/schema/util http://springframework.org/schema/util/spring-util-3.2.xsd

http://springframework.org/schema/mvc http://springframework.org/schema/mvc/spring-mvc-3.2.xsd">

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 {

@Test

public 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:

xmlns:xsi="http://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">

index.jsp

springmvc

org.springframework.web.servlet.DispatcherServlet

contextConfigLocation

classpath:spring-mvc.xml

1

springmvc

*.form

xmlns:xsi="http://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">

index.jsp

springmvc

org.springframework.web.servlet.DispatcherServlet

contextConfigLocation

classpath:spring-mvc.xml

1

springmvc

*.form

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"%>

<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

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"%>

<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>

${user.name}登录成功!

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 userService

private 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HttpServletRequest

public 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("ushttp://er", 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 data = new HashMap();

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

总结

以上就是这篇文章的全部内容了,希望本文的内容对大家的学习或者工作能带来一定的帮助,如果有疑问大家可以留言交流,谢谢大家对我们的支持。


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