使用者登入模組 - 1 基本的登陸功能

• 基本流程

  • webapp/login.jsp

    • form表單提交的action路徑
      • /system/user?operation=login

  • UserServlet - login方法

  • UserService + UserServiceImpl

    • login方法

  • UserDao - findByEmailAndPwd方法

  • UserDao.xml - findByEmailAndPwd查詢

（1）找到專案webapp/login.jsp登陸頁面，修改form表單提交的action路徑

<form action="${pageContext.request.contextPath}/login?operation=login" method="post">
</form>
 

（2）在後臺UserServlet新增登陸的方法

private void login(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    String email = request.getParameter("email");
    String pwd = request.getParameter("password");
    User user = userService.login(email,pwd);
    if(user != null) {
        request.getSession().setAttribute("loginUser", user);
        //跳轉頁面
        request.getRequestDispatcher("/WEB-INF/pages/home/main.jsp").forward(request, response);
    }else{
        response.sendRedirect(request.getContextPath()+"/login.jsp");
    }
}
 

（3）在因為層介面UserService中新增登陸的方法

/**
     * 根據郵箱和密碼登入
     * @param email
     * @param pwd
     * @return
     */
    User login(String email, String pwd);

（4）在對應的實現類中去實現登陸方法

@Override
public User login(String email, String pwd) {
    SqlSession sqlSession = null;
    try{
        //1.獲取SqlSession
        sqlSession = MapperFactory.getSqlSession();
        //2.獲取Dao
        UserDao userDao = MapperFactory.getMapper(sqlSession,UserDao.class);
        //3.呼叫Dao層操作
        pwd = MD5Util.md5(pwd);
        return userDao.findByEmailAndPwd(email,pwd);
    }catch (Exception e){
        throw new RuntimeException(e);
        //記錄日誌
    }finally {
        try {
            TransactionUtil.close(sqlSession);
        }catch (Exception e){
            e.printStackTrace();
        }
    }
}
 

（5）在UserDao介面中新增查詢方法

User findByEmailAndPwd(@Param("email")String email, @Param("password")String pwd);

（6）在UserDao.xml中新增查詢

<select id="findByEmailAndPwd" parameterType="map" resultMap="BaseResultMap">
    select
    <include refid="Base_Column_List"/>
    from ss_user
    where email = #{email,jdbcType=VARCHAR} and password = #{password,jdbcType=VARCHAR}
</select>

（7）將原本在webapp/pages/home下的所有頁面統一挪到/WEB-INF/pages下，注意是連同home目錄一起挪

（8）修改/WEB-INF/pages/home/main.jsp內容區的路徑

<!-- 內容區域 -->
<div class="content-wrapper">
    <iframe id="iframe" name="iframe"
            style="overflow:visible;"
            scrolling="auto"
            frameborder="no" height="100%" width="100%"
            src="${ctx}/system/user?operation=home"></iframe>
</div>

（9）在後臺UserServlet中新增方法

@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    String operation = request.getParameter("operation");
    if("list".equals(operation)){
        this.list(request,response);
    }
    //中間省略
    else if("home".equals(operation)){
        this.home(request,response);
    }
}
private void home(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    request.getRequestDispatcher("/WEB-INF/pages/home/home.jsp").forward(request, response);
}