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

在图中填上项目名称即可，其他直接next

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

整个目录结构：

pom依赖

 UTF-8
 1.7
 1.7
 4.3.18.RELEASE
 5.1.48
 3.0-alpha-1
 1.9
 1.4
 8.1.8.v20121106
 1.7.5
 6.8.7
 

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

2.

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

 Archetype Created Web Application
 Archetype Created Web Application

 
 
 org.springframework.web.context.ContextLoaderListener
 
 
 
 contextConfigLocation
 classpath:applicationContext.xml
 

 
 dispatcherServlet
 org.springframework.web.servlet.DispatcherServlet
 
  contextConfigLocation
  classpath:dispatcher-servlet.xml
 
 1
 
 
 dispatcherServlet
 /
 

resource里面新建两个spring xml文件

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

 
 
 
 
 

 
  com.mysql.jdbc.Driver
  jdbc:mysql://localhost:3306/web1
  root
  123
 
 
 
 

3.dispatcher-servlet.xml

4.Jsp

1.login

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>


 


${error}

注册

2.register

<%@ page contentType="text/html;charset=UTF-8" language="java" %>


 


 

3.success

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


 


  ${User}

4.success1

<%@ page contentType="text/html;charset=UTF-8" language="java" %>


 


 ${Insert}

配置好Tomcat就可以运行了

很简单的登录界面

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