如何通过Spring框架实现用户登录功能？
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本文共计1632个文字，预计阅读时间需要7分钟。
原文示例为：本文字例为：大家分享了使用Spring框架实现用户登录的具体代码，供大家参考。具体内容如下：流程：用户登录需求+登录页面login.jsp输入用户名username和密码password，如果用户名和密码在数据库中存在‘
简化改写后：示例：分享用Spring实现用户登录的代码，供参考。内容：用户登录需求，在login.jsp页输入用户名和密码，检查数据库中是否存在‘
本文实例为大家分享了用Spring框架实现用户登录的具体代码，供大家参考，具体内容如下
流程：用户登录需求
登录页面login.jsp>>输入用户名username和密码password，如果用户名和密码在数据库中能找到，则实现登录成功界面hello.jsp，不成功则跳转到失败页面error.jsp
1.创建项目架构
（1）创建Maven项目
Add Maven Property >> Name：archetypeCatalog >> value：internal
（2）添加本地数据仓库
（3）创建项目目录
1)groupId：指代公司名 >> com.zzx >> artifactId：指代项目名 >> spring_login
2)在项目根目录底下创建文件夹target；
3)在src >> main >> java 设置为Sources Root; src >> main >> resources 设置为Resources Root;
4)加载Pom.xml文件架包，一般此文件在实际研发中都是直接由架构师来完成的操作。一般需要注意架包版本的一致性，文件版本。
5)关于数据库设计：tb_user
uid（用户编号）,username（用户名）,password（用户密码）,tid（用户类型）。
resources >> db.properties
model、entity >> bean >> User
Spring核心配置文件applicationContext.xml
2.以下为具体代码：
Spring核心配置文件 applicationContext.xml
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="www.springframework.org/schema/beans" xmlns:xsi="www.w3.org/2001/XMLSchema-instance" xmlns:context="www.springframework.org/schema/context" xsi:schemaLocation="www.springframework.org/schema/beans www.springframework.org/schema/beans/spring-beans.xsd www.springframework.org/schema/context www.springframework.org/schema/context/spring-context.xsd"> <!-- 1.加载db.properties取到有效参数 --> <context:property-placeholder location="classpath:db.properties" /> <!-- 2.加载数据源 --> <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"> <property name="driverClassName" value="${driverClass}" /> <!-- EL表达式,JSTL --> <property name="url" value="${url}" /> <property name="username" value="${user}" /> <property name="password" value="${password}" /> </bean> <!-- 3.创建jdbcTemplate对象 --> <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate"> <property name="dataSource" ref="dataSource" /> </bean> <!-- 4.开启注解作用 --> <context:component-scan base-package="com.zzx" /> <bean id="userDao" class="com.zzx.dao.impl.UserDaoImpl" /> <bean id="userService" class="com.zzx.service.impl.UserServiceImpl" /> </beans>
连接数据库 db.properties
driverClass=com.mysql.jdbc.Driver url=jdbc:mysql://127.0.0.1:3306/db_java1ssm?useSSL=true&characterEncoding=utf-8 user=root password=123456
webapp下配置web.xml文件
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "java.sun.com/dtd/web-app_2_3.dtd" > <web-app> <display-name>Archetype Created Web Application</display-name> <!-- 1.配置applicationContext.xml --> <context-param> <param-name>contextConfigLocation</param-name> <param-value>classpath*:applicationContext.xml</param-value> </context-param> <!-- 2.监听器 --> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> </web-app>
jsp页面
<%--login.jsp--%> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>用户登录</title> </head> <body> <div id="content" align="center"> <h3>用户登录</h3> <hr> <form action="loginServlet.do" method="post"> <table border="1" cellpadding="0" cellspacing="0" width="300px"> <tr> <td><label for="username">用户名:</label></td> <td><input type="text" id="username" name="username"/></td> </tr> <tr> <td><label for="password">用户密码:</label></td> <td><input type="text" id="password" name="password"/></td> </tr> <tr> <td colspan="2"> <input type="submit" name="submit" id="submit" value="登录"/></td> </tr> </table> </form> </div> </body> </html> <%--hello.jsp--%> <%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %> <html> <head> <title>登录成功页面</title> </head> <body> <font>欢迎您，${user.username}</font> </body> </html> <%--error.jsp--%> <%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %> <html> <head> <title>登录失败页面</title> </head> <body> <font>登录失败！请你重新登录！</font> </body> </html>
bean层User类
public class User { private int uid; private String username; private String password; private int tid; public int getUid() { return uid; } public void setUid(int uid) { this.uid = uid; } 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 int getTid() { return tid; } public void setTid(int tid) { this.tid = tid; } public User() { } public User(int uid, String username, String password, int tid) { this.uid = uid; this.username = username; this.password = password; this.tid = tid; } public User(String username, String password, int tid) { this.username = username; this.password = password; this.tid = tid; } @Override public String toString() { return "User{" + "uid=" + uid + ", username='" + username + '\'' + ", password='" + password + '\'' + ", tid=" + tid + '}'; } }
dao层UserDao
@Component public interface UserDao { //用户登录 User doLogin(String username,String password); }
UserDaoImpl
@Component public class UserDaoImpl implements UserDao { @Autowired private JdbcTemplate jdbcTemplate; public void setJdbcTemplate(JdbcTemplate jdbcTemplate) { this.jdbcTemplate = jdbcTemplate; } @Override public User doLogin(String username, String password) { String sql = "select * from tb_user where username=? and password=?"; BeanPropertyRowMapper<User> mapper = new BeanPropertyRowMapper<>(User.class); User user = null; user = jdbcTemplate.queryForObject(sql, mapper, username, password); return user; } }
service层UserService
@Service public interface UserService { //用户登录 User doLogin(String username, String password); }
UserServiceImpl
@Service public class UserServiceImpl implements UserService { @Autowired private UserDao userDao ; public void setUserDao(UserDao userDao) { this.userDao = userDao; } @Override public User doLogin(String username, String password) { return userDao.doLogin(username,password); } }
LoginServlet
@WebServlet("*.do") public class LoginServlet extends javax.servlet.http.HttpServlet { private static final long serialVersionUID =1L; // 报错是因为这个里面少tomcat - 加载tomcat protected void doPost(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) throws javax.servlet.ServletException, IOException { // 中文乱码问题 : 国际标准化 request.setCharacterEncoding("utf-8"); response.setContentType("text/html;charset=UTF-8"); // applicationContext.xml ApplicationContext ioc = WebApplicationContextUtils.getWebApplicationContext(getServletContext()); // 获取用户名 String username = request.getParameter("username"); String password = request.getParameter("password"); UserService userService = (UserService) ioc.getBean("userService"); User user = userService.doLogin(username, password); request.setAttribute("user",user); if(user==null){ // 失败 request.getRequestDispatcher("error.jsp").forward(request,response); }else{ request.getRequestDispatcher("hello.jsp").forward(request,response); } } protected void doGet(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) throws javax.servlet.ServletException, IOException { this.doPost(request,response); } }
最后配置一下Tomcat服务器运行
下面是我的运行截图
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持自由互联。
本文共计1632个文字，预计阅读时间需要7分钟。
原文示例为：本文字例为：大家分享了使用Spring框架实现用户登录的具体代码，供大家参考。具体内容如下：流程：用户登录需求+登录页面login.jsp输入用户名username和密码password，如果用户名和密码在数据库中存在‘
简化改写后：示例：分享用Spring实现用户登录的代码，供参考。内容：用户登录需求，在login.jsp页输入用户名和密码，检查数据库中是否存在‘
本文实例为大家分享了用Spring框架实现用户登录的具体代码，供大家参考，具体内容如下
流程：用户登录需求
登录页面login.jsp>>输入用户名username和密码password，如果用户名和密码在数据库中能找到，则实现登录成功界面hello.jsp，不成功则跳转到失败页面error.jsp
1.创建项目架构
（1）创建Maven项目
Add Maven Property >> Name：archetypeCatalog >> value：internal
（2）添加本地数据仓库
（3）创建项目目录
1)groupId：指代公司名 >> com.zzx >> artifactId：指代项目名 >> spring_login
2)在项目根目录底下创建文件夹target；
3)在src >> main >> java 设置为Sources Root; src >> main >> resources 设置为Resources Root;
4)加载Pom.xml文件架包，一般此文件在实际研发中都是直接由架构师来完成的操作。一般需要注意架包版本的一致性，文件版本。
5)关于数据库设计：tb_user
uid（用户编号）,username（用户名）,password（用户密码）,tid（用户类型）。
resources >> db.properties
model、entity >> bean >> User
Spring核心配置文件applicationContext.xml
2.以下为具体代码：
Spring核心配置文件 applicationContext.xml
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="www.springframework.org/schema/beans" xmlns:xsi="www.w3.org/2001/XMLSchema-instance" xmlns:context="www.springframework.org/schema/context" xsi:schemaLocation="www.springframework.org/schema/beans www.springframework.org/schema/beans/spring-beans.xsd www.springframework.org/schema/context www.springframework.org/schema/context/spring-context.xsd"> <!-- 1.加载db.properties取到有效参数 --> <context:property-placeholder location="classpath:db.properties" /> <!-- 2.加载数据源 --> <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"> <property name="driverClassName" value="${driverClass}" /> <!-- EL表达式,JSTL --> <property name="url" value="${url}" /> <property name="username" value="${user}" /> <property name="password" value="${password}" /> </bean> <!-- 3.创建jdbcTemplate对象 --> <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate"> <property name="dataSource" ref="dataSource" /> </bean> <!-- 4.开启注解作用 --> <context:component-scan base-package="com.zzx" /> <bean id="userDao" class="com.zzx.dao.impl.UserDaoImpl" /> <bean id="userService" class="com.zzx.service.impl.UserServiceImpl" /> </beans>
连接数据库 db.properties
driverClass=com.mysql.jdbc.Driver url=jdbc:mysql://127.0.0.1:3306/db_java1ssm?useSSL=true&characterEncoding=utf-8 user=root password=123456
webapp下配置web.xml文件
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "java.sun.com/dtd/web-app_2_3.dtd" > <web-app> <display-name>Archetype Created Web Application</display-name> <!-- 1.配置applicationContext.xml --> <context-param> <param-name>contextConfigLocation</param-name> <param-value>classpath*:applicationContext.xml</param-value> </context-param> <!-- 2.监听器 --> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> </web-app>
jsp页面
<%--login.jsp--%> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>用户登录</title> </head> <body> <div id="content" align="center"> <h3>用户登录</h3> <hr> <form action="loginServlet.do" method="post"> <table border="1" cellpadding="0" cellspacing="0" width="300px"> <tr> <td><label for="username">用户名:</label></td> <td><input type="text" id="username" name="username"/></td> </tr> <tr> <td><label for="password">用户密码:</label></td> <td><input type="text" id="password" name="password"/></td> </tr> <tr> <td colspan="2"> <input type="submit" name="submit" id="submit" value="登录"/></td> </tr> </table> </form> </div> </body> </html> <%--hello.jsp--%> <%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %> <html> <head> <title>登录成功页面</title> </head> <body> <font>欢迎您，${user.username}</font> </body> </html> <%--error.jsp--%> <%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %> <html> <head> <title>登录失败页面</title> </head> <body> <font>登录失败！请你重新登录！</font> </body> </html>
bean层User类
public class User { private int uid; private String username; private String password; private int tid; public int getUid() { return uid; } public void setUid(int uid) { this.uid = uid; } 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 int getTid() { return tid; } public void setTid(int tid) { this.tid = tid; } public User() { } public User(int uid, String username, String password, int tid) { this.uid = uid; this.username = username; this.password = password; this.tid = tid; } public User(String username, String password, int tid) { this.username = username; this.password = password; this.tid = tid; } @Override public String toString() { return "User{" + "uid=" + uid + ", username='" + username + '\'' + ", password='" + password + '\'' + ", tid=" + tid + '}'; } }
dao层UserDao
@Component public interface UserDao { //用户登录 User doLogin(String username,String password); }
UserDaoImpl
@Component public class UserDaoImpl implements UserDao { @Autowired private JdbcTemplate jdbcTemplate; public void setJdbcTemplate(JdbcTemplate jdbcTemplate) { this.jdbcTemplate = jdbcTemplate; } @Override public User doLogin(String username, String password) { String sql = "select * from tb_user where username=? and password=?"; BeanPropertyRowMapper<User> mapper = new BeanPropertyRowMapper<>(User.class); User user = null; user = jdbcTemplate.queryForObject(sql, mapper, username, password); return user; } }
service层UserService
@Service public interface UserService { //用户登录 User doLogin(String username, String password); }
UserServiceImpl
@Service public class UserServiceImpl implements UserService { @Autowired private UserDao userDao ; public void setUserDao(UserDao userDao) { this.userDao = userDao; } @Override public User doLogin(String username, String password) { return userDao.doLogin(username,password); } }
LoginServlet
@WebServlet("*.do") public class LoginServlet extends javax.servlet.http.HttpServlet { private static final long serialVersionUID =1L; // 报错是因为这个里面少tomcat - 加载tomcat protected void doPost(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) throws javax.servlet.ServletException, IOException { // 中文乱码问题 : 国际标准化 request.setCharacterEncoding("utf-8"); response.setContentType("text/html;charset=UTF-8"); // applicationContext.xml ApplicationContext ioc = WebApplicationContextUtils.getWebApplicationContext(getServletContext()); // 获取用户名 String username = request.getParameter("username"); String password = request.getParameter("password"); UserService userService = (UserService) ioc.getBean("userService"); User user = userService.doLogin(username, password); request.setAttribute("user",user); if(user==null){ // 失败 request.getRequestDispatcher("error.jsp").forward(request,response); }else{ request.getRequestDispatcher("hello.jsp").forward(request,response); } } protected void doGet(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) throws javax.servlet.ServletException, IOException { this.doPost(request,response); } }
最后配置一下Tomcat服务器运行
下面是我的运行截图
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持自由互联。