Thymeleaf：登录（二）

客官°小女子只卖身不卖艺 2024-03-22 14:34 49阅读 0赞

#### 登录页面 ####

<!DOCTYPE html>
    <html lang="en" xml:th="http://www.thymeleaf.org">
    <head>
        <meta charset="UTF-8">
        <title>Title</title>
    </head>
    <body>
    
    <form th:action="@{/auth}" method="post">
        
        <input type="hidden" name="method" value="login" />
    
        
        
        <p style="color: red;font-weight: bold;" th:text="${message}"></p>
        <p style="color: red;font-weight: bold;" th:text="${systemMessage}"></p>
    
        账号：<input type="text" name="loginAccount"/><br/>
        密码：<input type="password" name="loginPassword"><br/>
        <button type="submit">进宫</button>
    </form>
    
    </body>
    </html>

#### AuthServlet ####

import javax.servlet.ServletException;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    import javax.servlet.http.HttpSession;
    import java.io.IOException;
    
    public class AuthServlet extends ModelBaseServlet {
        
    
        private EmpService empService = new EmpServiceImpl();
    
        protected void login(
                HttpServletRequest request,
                HttpServletResponse response)
                throws ServletException, IOException {
        
    
            try {
        
                // 1、获取请求参数
                String loginAccount = request.getParameter("loginAccount");
                String loginPassword = request.getParameter("loginPassword");
    
                // 2、调用 EmpService 方法执行登录逻辑
                Emp emp = empService.getEmpByLoginAccount(loginAccount, loginPassword);
    
                // 3、通过 request 获取 HttpSession 对象
                HttpSession session = request.getSession();
    
                // 4、将查询到的 Emp 对象存入 Session 域
                session.setAttribute(ImperialCourtConst.LOGIN_EMP_ATTR_NAME, emp);
    
                // 5、前往指定页面视图
                String templateName = "temp";
                processTemplate(templateName, request, response);
    
            } catch (Exception e) {
        
                e.printStackTrace();
    
                // 6、判断此处捕获到的异常是否是登录失败异常
                if (e instanceof LoginFailedException) {
        
                    // 7、如果是登录失败异常则跳转回登录页面
                    // ①将异常信息存入请求域
                    request.setAttribute("message", e.getMessage());
    
                    // ②处理视图：index
                    processTemplate("index", request, response);
    
                }else {
        
                    // 8、如果不是登录异常则封装为运行时异常继续抛出
                    throw new RuntimeException(e);
    
                }
            }
        }
    }

#### web.xml ####

<servlet>
            <servlet-name>authServlet</servlet-name>
            <servlet-class>com.wuxian.servlet.AuthServlet</servlet-class>
        </servlet>
        <servlet-mapping>
            <servlet-name>authServlet</servlet-name>
            <url-pattern>/auth</url-pattern>
        </servlet-mapping>

#### temp临时页面即为退出登录页面 ####

<!DOCTYPE html>
    <html lang="en" xml:th="http://www.thymeleaf.org">
    <head>
        <meta charset="UTF-8">
        <title>临时</title>
    </head>
    <body>
    
        <p th:text="${session.loginInfo}"></p>
        <a th:href="@{/auth?method=logout}">退朝</a>
    
    </body>
    </html>