IDEA实现 springmvc的简单注册登录功能的示例代码

1.基本环境搭建

spring简介

SpringMVC框架是以请求为驱动，围绕Servlet设计，将请求发给控制器，然后通过模型对象，分派器来展示请求结果视图。其中核心类是DispatcherServlet，它是一个Servlet，顶层是实现的Servlet接口。

project创建

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在图中填上项目名称即可，其他直接next

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如上图所示，创建两个包，并且指定包的类型，如下图，java包指定为Sources Root,resouces包指定为Resources root

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整个目录结构：

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pom依赖

<properties>
 <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 <maven.compiler.source>1.7</maven.compiler.source>
 <maven.compiler.target>1.7</maven.compiler.target>
 <spring.version>4.3.18.RELEASE</spring.version>
 <mysql.version>5.1.48</mysql.version>
 <servlet.version>3.0-alpha-1</servlet.version>
 <commons-codec.version>1.9</commons-codec.version>
 <commons-dbcp.version>1.4</commons-dbcp.version>
 <jetty.version>8.1.8.v20121106</jetty.version>
 <slf4j.version>1.7.5</slf4j.version>
 <testng.version>6.8.7</testng.version>
 </properties>

 <dependencies>
 <dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-core</artifactId>
  <version>4.3.18.RELEASE</version>
 </dependency>
 <dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-beans</artifactId>
  <version>${spring.version}</version>
 </dependency>
 <dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-jdbc</artifactId>
  <version>${spring.version}</version>
 </dependency>
 <dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-context</artifactId>
  <version>${spring.version}</version>
 </dependency>
 <dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-webmvc</artifactId>
  <version>${spring.version}</version>
 </dependency>
 <dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-context-support</artifactId>
  <version>${spring.version}</version>
 </dependency>
 <dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-tx</artifactId>
  <version>${spring.version}</version>
 </dependency>
 <dependency>
  <groupId>mysql</groupId>
  <artifactId>mysql-connector-java</artifactId>
  <version>${mysql.version}</version>
 </dependency>
 <dependency>
  <groupId>commons-dbcp</groupId>
  <artifactId>commons-dbcp</artifactId>
  <version> 1.4</version>
 </dependency>
 <dependency>
  <groupId>javax.servlet</groupId>
  <artifactId>servlet-api</artifactId>
  <version>3.0-alpha-1</version>
  <scope>provided</scope>
 </dependency>
 <dependency>
  <groupId>javax.servlet.jsp</groupId>
  <artifactId>jsp-api</artifactId>
  <version>2.2</version>
 </dependency>
 <dependency>
  <groupId>org.aspectj</groupId>
  <artifactId>aspectjweaver</artifactId>
  <version>1.9.4</version>
 </dependency>
 <dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-web</artifactId>
  <version>${spring.version}</version>
 </dependency>
 <dependency>
  <groupId>jstl</groupId>
  <artifactId>jstl</artifactId>
  <version>1.2</version>
 </dependency>
 <dependency>
  <groupId>org.testng</groupId>
  <artifactId>testng</artifactId>
  <version>6.14.3</version>
  <scope>test</scope>
 </dependency>
 <dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-test</artifactId>
  <version>${spring.version}</version>
  <scope>test</scope>
 </dependency>
 </dependencies>

1.domain 实体类

package domain;

public class User {
 private String username;
 private String password;
 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;
 }
}

2.dao层（实现了查询和插入）

package dao;

import domain.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Repository;
 @Repository
 public class UserDao{
  private JdbcTemplate jdbcTemplate;
  private final static String sql=" Select count(*) from user_name where username=? and password=? ";
  private final static String sqlInsert="insert into user_name(username,password) values (?,?)";
  @Autowired
  public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {
   this.jdbcTemplate = jdbcTemplate;
  }
  public int FindUser(String username,String password)
  {
   return jdbcTemplate.queryForObject(sql,new Object[]{username,password},Integer.class);
  }
  //
  public void InsertUser(String username,String password){
   jdbcTemplate.update(sqlInsert, username,password);
  }
 }

3.service层

package service;

import dao.UserDao;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
  @Service
  public class UserService {
  private UserDao userdao;
  @Autowired
  public void setUserDao(UserDao userdao) {
   this.userdao = userdao;
  }
  public boolean Match(String username,String password)
  {
   int count=userdao.FindUser(username,password);
   return count>0;
  }
   public void InsertUser(String username,String password){
    userdao.InsertUser(username,password);
   }
 }

4.controller层（这里用的包名为web）

package web;

import domain.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;
import service.UserService;

import javax.servlet.http.HttpServletRequest;
 @Controller
 public class UserController {
 private UserService userService;

 @Autowired
 public void setUserService(UserService userService) 
  this.userService = userService;
 }
 @RequestMapping(value = "/index.html")
 public String tologin()
 { 
  return "login";
 }
 @RequestMapping(value = "/login")
 public ModelAndView login(HttpServletRequest request, User user){
  boolean isValidUser=userService.Match(user.getUsername(),user.getPassword());
  if (isValidUser){
 request.getSession().setAttribute("User",user.getUsername()+":登录成功");
   return new ModelAndView("success");
  }else{
   return new ModelAndView("login");
  }
 }
 @RequestMapping("/insert")
 public String InsertUser(User user, Model model){
  userService.InsertUser(user.getUsername(),user.getPassword());
  model.addAttribute("Insert","注册成功");
  return "success1";
 }
 @RequestMapping("/insertPage")
 public String InsertPage()
 {
  return "register";
 }

}

3.xml配置

1.web.xml

<!DOCTYPE web-app PUBLIC
 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app xmlns="http://java.sun.com/xml/ns/javaee"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
   http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
   version="3.0">
 <display-name>Archetype Created Web Application</display-name>
 <display-name>Archetype Created Web Application</display-name>

 <!--配置Spring的监听器，默认只加载WEB-INF目录下的applicationContext.xml配置文件-->
 <listener>
 <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
 </listener>
 <!--设置配置文件的路径-->
 <context-param>
 <param-name>contextConfigLocation</param-name>
 <param-value>classpath:applicationContext.xml</param-value>
 </context-param>

 <servlet>
 <servlet-name>dispatcherServlet</servlet-name>
 <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
 <init-param>
  <param-name>contextConfigLocation</param-name>
  <param-value>classpath:dispatcher-servlet.xml</param-value>
 </init-param>
 <load-on-startup>1</load-on-startup>
 </servlet>
 <servlet-mapping>
 <servlet-name>dispatcherServlet</servlet-name>
 <url-pattern>/</url-pattern>
 </servlet-mapping>
</web-app>

resource里面新建两个spring xml文件

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2.applicationContext.xml
spring的配置文件applicationContext.xml中的一些配置的作用。

<?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:tx="http://www.springframework.org/schema/tx"
  xmlns:aop="http://www.springframework.org/schema/aop"
  xsi:schemaLocation="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.xsd
  http://www.springframework.org/schema/tx
  http://www.springframework.org/schema/tx/spring-tx.xsd
  http://www.springframework.org/schema/aop
  http://www.springframework.org/schema/aop/spring-aop.xsd"
  xmlns:context="http://www.springframework.org/schema/context"
  xmlns:p="http://www.springframework.org/schema/p"
>
 <!--包扫描-->
 <context:component-scan base-package="dao"/>
 <context:component-scan base-package="service"/>
 <context:component-scan base-package="web"/>
 <!-- 配置数据源 -->

 <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
  <property name="driverClassName"><value>com.mysql.jdbc.Driver</value></property>
  <property name="url"><value>jdbc:mysql://localhost:3306/web1</value></property>
  <property name="username"><value>root</value></property>
  <property name="password"><value>123</value></property>
 </bean>
 <!-- 配置Jdbc模板 -->
 <bean class="org.springframework.jdbc.core.JdbcTemplate"
   id="jdbcTemplate" p:dataSource-ref="dataSource"/>
 <bean id="transactionManager"
   class="org.springframework.jdbc.datasource.DataSourceTransactionManager"
   p:dataSource-ref="dataSource"/>


</beans>

3.dispatcher-servlet.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" xmlns:p="http://www.springframework.org/schema/p"
  xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/cache"
  xsi:schemaLocation="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.xsd
 http://www.springframework.org/schema/mvc
 http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/cache http://www.springframework.org/schema/cache/spring-cache.xsd"
 >

 <context:component-scan base-package="dao"/>
 <context:component-scan base-package="service"/>
 <context:component-scan base-package="web"/>
 <mvc:annotation-driven/>
 <!--mvc视图解析-->
  <bean id="defaultViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
  <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
  <property name="prefix" value="/WEB-INF/jsp/"/><!--设置JSP文件的目录位置-->
  <property name="suffix" value=".jsp"/>
  <property name="exposeContextBeansAsAttributes" value="true"/>
 </bean>
 <!--如果不写proxy-target-class="true"这句话也没问题-->
 <aop:aspectj-autoproxy proxy-target-class="true"/>
</beans>

4.Jsp

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<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
 <title>主页</title>
</head>
<body>
${error}
<form action="<c:url value="/login"/>" method="post">
 用户名:<input type="text" name="username"><br>
 密码:<input type="password" name="password"><br>
 <input type="submit" value="登录">
</form>
<a href="${pageContext.request.contextPath}/insertPage" rel="external nofollow" >注册</a>
</body>
</html>

2.register

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
 <title>Title</title>
</head>
<body>
 <form method="post" action="${pageContext.request.contextPath}/insert">
  用户名:<input type="text" name="username"><br>
  密码:<input type="password" name="password"><br>
  <input type="submit" value="注册">
 </form>
</body>
</html>

3.success

<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
 <title>成功</title>
</head>
<body>
  ${User}
</body>
</html>

4.success1

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
 <title>注册成功</title>
</head>
<body>
<a href="${pageContext.request.contextPath}/index.html" rel="external nofollow" > ${Insert}</a>
</body>
</html>

配置好Tomcat就可以运行了

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很简单的登录界面

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