导入jar包
编写配置文件(点击Namespaces添加context、mvc)
springmvc.xml
<?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:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd">
<!-- 声明组件扫描器 -->
<context:component-scan base-package="cn.lexed.controller"></context:component-scan>
<mvc:annotation-driven/>
<!-- 视图解析器 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<!-- 前缀： -->
<property name="prefix" value="/WEB-INF/jsp/"></property>
<!-- 后缀： -->
<property name="suffix" value=".jsp"></property>
</bean>
</beans>
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
<display-name>Springmvc-2</display-name>
<servlet>
<servlet-name>myweb</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:springmvc.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>myweb</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
创建并编写login
login.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="/Springmvc-2/uc/logss" method="post">
用户名：<input type="text" name="username"/> <br />
密码：<input type="password" name="pss"/> <br />
<input type="submit" value="登录"/>
</form>
</body>
</html>
创建jsp文件夹编写main
main.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
欢迎进入XXXX系统
用户名：${u}
</body>
</html>
编写User类
User.java
package cn.lexed.pojo;
public class User {
private String username;
private String pss;
public User() {
super();
}
public User(String username, String pss) {
super();
this.username = username;
this.pss = pss;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPss() {
return pss;
}
public void setPss(String pss) {
this.pss = pss;
}
@Override
public String toString() {
return "User [username=" + username + ", pss=" + pss + "]";
}
}
编写UserController
UserController.java
package cn.lexed.controller;
import javax.servlet.http.HttpSession;
import org.apache.catalina.servlet4preview.http.HttpServletRequest;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import cn.lexed.pojo.User;
@Controller
@RequestMapping("/uc")
public class UserController {
/* 方法里参数的问题
*
*
* */
//登录功能
@RequestMapping("/log")
public String login(String username,String pss,HttpServletRequest req){
//逻辑代码
if(username.equals("zhangsan")&& pss.equals("123")){
//把用户名存到request作用域中
req.setAttribute("u", username);
return "main";//登录界面
}else{
return "forward:/login.jsp";
}
}
/* @RequestMapping:请求映射，作用：把一个请求地址和一个方法绑定在一起
* value:首先是String，表示请求的uri地址，不能重复
* method:用于被注解方法所处理请求的提交方式进行限制，
* 只有满足该method属性指定的提交方式的请求，才会执行该被注解的方法
* 处理器方法的返回值：
* ModelAndView:model-数据 view-视图
* String:处理器方法返回的字符串可以指定逻辑视图名
* 在通过视图解析器可以将其转成物理视图地址
* void:axios
* Object:
* */
@RequestMapping(value="/logs",method=RequestMethod.POST)
public String logins(User user,HttpSession session){
System.out.println();
System.out.println();
if(user.getUsername().equals("zhangsan")&& user.getPss().equals("123")){
//把用户名存到request作用域中
session.setAttribute("u", user.getUsername());
return "main";//登录界面
}else{
return "forward:/login.jsp";
}
}
/* springmvc中的转发和重定向
* request.getRequestDispatcher("/目标URL-pattern").forward(request)
* response.sendRedirect("目标URI");
*
* SpringMvc的指示符：
* forward：转发
* redirect：重定向
* redirect:不能直接访问/WEB-INF里的资源
*
* */
@RequestMapping(value="/logss",method=RequestMethod.POST)
public String loginss(User user,HttpSession session){
if(user.getUsername().equals("zhangsan")&& user.getPss().equals("123")){
//把用户名存到request作用域中
session.setAttribute("u", user.getUsername());
return "redirect:/uc/main";//登录界面
}else{
return "forward:/login.jsp";
}
}
@RequestMapping("/main")
public String main(){
return "main";
}
}
添加到服务器并启动服务器
利用浏览器访问(点击登录自动跳转)
