Springmvc的学习

标签：username return String Springmvc 学习 User pss public

导入jar包

Springmvc的学习_spring

编写配置文件(点击Namespaces添加context、mvc)

Springmvc的学习_spring_02

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

Springmvc的学习_xml_03

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

Springmvc的学习_html_04

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

Springmvc的学习_html_05

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

Springmvc的学习_html_06

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

Springmvc的学习_html_07

利用浏览器访问(点击登录自动跳转)

Springmvc的学习_xml_08

Springmvc的学习_xml_09

标签：username,return,String,Springmvc,学习,User,pss,public
From： https://blog.51cto.com/u_16220922/8154058