SSM整合进阶之---简单登录注册demo

SSM框架搭建见我上篇博客：

https://blog.csdn.net/x_san3/article/details/81537461

本篇为实现简单的登录注册功能，需要添加的代码和注意点如下：

1. Dao层添加这两个接口

// 添加用户
public void addUser(User user);

// 根据用户名查询用户
// 注解的两个参数会自动封装成map集合，括号内即为键
public User findByUsername(@Param("name") String name);

2. UserMapper.xml （映射文件）添加语句

<insert id="addUser" parameterType="User">
	insert into t_user(USER_NAME, USER_PASSWORD) values(#{userName}, #{userPassword})
</insert>
	
<!--注意这里的参数类型是parameterType而不是parameterMap，因为返回的是单个类型  -->
<select id="findByUsername"  parameterType="Map"  resultType="User">
	select t.USER_NAME,t.USER_PASSWORD from t_user t where USER_NAME=#{name}
</select>

3. UserService.java 添加

	// 用户注册
	void regist(User user);

	// 用户登录
	User login(String name, String password);

4. UserServiceImpl.java 添加

	public void regist(User user) {
		userDao.addUser(user);		
	}

	public User login(String name, String password) {
		User user = userDao.findByUsername(name);
        if(user != null && user.getUserPassword().equals(password)){
        
            return user;
        }
        return null;
	}

5. 控制层UserController.java 添加

    @RequestMapping("/regist")
    public String regist(){
        return "regist";
    }
    
    @RequestMapping("/doRegist")
    public String doRegist(User user, Model model){
        System.out.println(user.getUserName());
        userService.regist(user);
        return "success";
    }

    @RequestMapping("/login")
    public String checkLogin(User user, Model model){
        user = userService.login(user.getUserName(), user.getUserPassword());
        //若有user则添加到model里并且跳转到成功页面
        if(user != null){
            model.addAttribute("user",user);
            return "success";
        }
        System.out.println(user);
        return "fail";
    }
    
    @RequestMapping("/index")
    public String index(){
        return "index";
    }

6. WEB-INF/view/文件夹下建jsp页面

regist.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">
<head>
    <title>用户注册页面</title>
</head>
<body>
    <h3>注册页面</h3>
    <hr/>
    <form action="${pageContext.request.contextPath}/user/doRegist" method="post">
        <table>
            <tr height="35px">
                <td width="100px">用户名</td>
                <td width="270px">
                    <input type="text" name="userName">
                </td>
            </tr>
            <tr height="35px">
                <td>密码</td>
                <td>
                    <input type="text" name="userPassword">
                </td>
            </tr>
            <tr>
                <td colspan="2" align="center">
                    <input type="submit" id="regist" value="注册"/>
                </td>
            </tr>
        </table>
    </form>
</body>
</html>

success.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>

    <div>
        <strong> welcome,${sessionScope.user.username}! </strong>
    </div>
    this is success page!

    <%-- <a href="${pageContext.request.contextPath}/user/anotherpage">点我跳到另一个页面</a> --%>

    <form action="${pageContext.request.contextPath}/user/index">
        <table>
            <tr>
                <td><input type="submit" value="退出登录"></td>
            </tr>
        </table>
    </form>
</body>
</html>

index.jsp(用于退出登录到首页)

<%@ 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="${pageContext.request.contextPath}/user/login" method="post">
        <table>
            <tr>
                <td>用户名:</td>
                <td><input name="userName" type="text"></td>
            </tr>
            <tr>
                <td>密码:</td>
                <td><input name="userPassword" type="password"></td>
            </tr>
            <tr >
                <td><input type="submit" value="登录"  ></td>
                <td><input type="button" value="注册" onclick="window.location.href='/user/regist'"> </td>
            </tr>

        </table>
    </form>
</body>
</html>

fail.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>
     this is a fail page!
</body>
</html>

说明：可以直接地址栏输入http://localhost:8080/user/index进到首页进行登录注册

源码下载：https://download.csdn.net/download/x_san3/10595731

SSM整合进阶之---简单登录注册demo

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