SpringMVC登录案例

学习了一周的springMVC
今天搭建一个SpringMVC的登录案例
主要是用来巩固一下拦截器的是使用。

1.首先配置web.xml 配置
主要是配置encodingfilter和dispatcher

<?xml version="1.0" encoding="UTF-8"?><web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"         version="3.1">    <!--字符集设置-->    <filter>        <filter-name>encodingFilter</filter-name>        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>        <init-param>            <param-name>encoding</param-name>            <param-value>utf-8</param-value>        </init-param>    </filter>    <filter-mapping>        <filter-name>encodingFilter</filter-name>        <url-pattern>/*</url-pattern>    </filter-mapping>    <!--调度器配置-->    <servlet>        <servlet-name>dispatcher</servlet-name>        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>        <load-on-startup>1</load-on-startup>    </servlet>    <servlet-mapping>        <servlet-name>dispatcher</servlet-name>        <url-pattern>*.form</url-pattern>    </servlet-mapping></web-app>

2.配置dispatcher指定的servlet.xml
主要配置拦截器的相关属性

<beans xmlns="http://www.springframework.org/schema/beans"       xmlns:context="http://www.springframework.org/schema/context"       xmlns:mvc="http://www.springframework.org/schema/mvc"       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"       xsi:schemaLocation="        http://www.springframework.org/schema/beans        http://www.springframework.org/schema/beans/spring-beans.xsd        http://www.springframework.org/schema/mvc        http://www.springframework.org/schema/mvc/spring-mvc.xsd        http://www.springframework.org/schema/context        http://www.springframework.org/schema/context/spring-context.xsd">    <!--指定注解解析的包-->    <context:component-scan base-package="com.jsu.controller"/>    <!--配置拦截器-->    <mvc:interceptors>        <mvc:interceptor>            <mvc:mapping path="/**"/>           <!-- 指定拦截器的bean -->            <bean class="com.jsu.intercepter.LoginIntercepter">                <property name="allowAdress">                    <!--允许通过的请求的列表-->                    <list>                        <value>login.form</value>                        <value>add.form</value>                    </list>                </property>            </bean>        </mvc:interceptor>    </mvc:interceptors></beans>

前车之鉴：千万不能使用如下配置不然会无法识别拦截器的拦截名单

<property name="allowAdress">                    <!--允许通过的请求的列表-->                    <list>                        <value>                            login.form                        </value>                        <value>                            add.form                        </value>                    </list>                </property>

3.配置intercepter的类
主要通过实现handlerintercepter接口

public class LoginIntercepter implements HandlerInterceptor {    //拦截名单    List<String> allowAdress;    public void setAllowAdress(List<String> allowAdress) {        this.allowAdress = allowAdress;    }    /**     * 请求方法执行前所执行的方法     * 返回true 则进行拦截     * 否则不进行拦截     */    @Override    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {        //获取请求的路径        String url = httpServletRequest.getRequestURL().toString();        //查看是否已经有请求        Object user = httpServletRequest.getSession().getAttribute("user");        if (user != null){            return true;        }        for (String temp : allowAdress) {            if (url.endsWith(temp)) {                return true;            }        }        //重定向到login页面        httpServletResponse.sendRedirect(httpServletRequest.getContextPath()+"/login.jsp");        return false;    }    @Override    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {    }    @Override    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {    }}

4.配置controller类

@Controllerpublic class LoginController {    @RequestMapping("/login")    public String login(User user,HttpSession session){        //校验        if ("zzz".equals(user.getName())&&"123".equals(user.getPassword())) {            session.setAttribute("user", user);            return "redirect:index.jsp";        }        return "redirect:login.jsp";    }    @RequestMapping("/add")    public String add(){        System.out.println("add");        return "redirect:index.jsp";    }}

5.配置实体类

public class User{    private String name;    private String password;    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public String getPassword() {        return password;    }    public void setPassword(String password) {        this.password = password;    }}

6.demo结果

错误结果就重定向到login.jsp页面