package com.example.springbootdemo06.mapper; import com.baomidou.mybatisplus.core.mapper.BaseMapper; import com.example.springbootdemo06.entity.screenshot; public interface ScreenShotMapper extends BaseMapper<screenshot> { }

这是一个 MyBatis-Plus 的 Mapper 接口，它继承了 `BaseMapper` 接口，并指定了实体类为 `screenshot`。`BaseMapper` 接口提供了一些常用的 CRUD 方法，例如：

- `insert`：插入一条记录；
- `deleteById`：根据主键删除一条记录；
- `updateById`：根据主键更新一条记录；
- `selectById`：根据主键查询一条记录；
- `selectList`：查询所有记录。

在继承了 `BaseMapper` 接口后，就可以直接使用这些方法，无需再手动编写 SQL 语句。同时，还可以根据需要自定义其他查询方法，例如：

public interface ScreenShotMapper extends BaseMapper<screenshot> {
    List<screenshot> selectByUserId(Long userId);
}

该方法用于查询指定用户的所有截图记录，可以在 Mapper 映射文件中编写对应的 SQL 语句，或使用 MyBatis-Plus 提供的条件构造器来实现。

相关问题

写一个 org.dozer 入门案例

好的，下面是一个简单的Dozer入门案例，假设我们有两个Java类：Person和PersonDTO，它们之间的属性有一些不同，我们需要进行对象之间的转换。

首先，我们需要引入Dozer的依赖，如果使用Maven，可以在pom.xml文件中添加以下依赖：

<dependency>
    <groupId>com.github.dozermapper</groupId>
    <artifactId>dozer-core</artifactId>
    <version>5.5.1</version>
</dependency>

接下来，我们需要定义一个Dozer映射文件，将Person对象的属性映射到PersonDTO对象的属性。在src/main/resources目录下创建一个名为"dozer_mapping.xml"的文件，内容如下：

<?xml version="1.0" encoding="UTF-8"?>
<mappings xmlns="http://dozermapper.github.io/schema/bean-mapping"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://dozermapper.github.io/schema/bean-mapping http://dozermapper.github.io/schema/bean-mapping.xsd">
    <mapping>
        <class-a>com.example.Person</class-a>
        <class-b>com.example.PersonDTO</class-b>
        <field>
            <a>name</a>
            <b>fullName</b>
        </field>
        <field>
            <a>age</a>
            <b>age</b>
        </field>
    </mapping>
</mappings>

这个映射文件定义了Person和PersonDTO之间的映射关系，将Person对象的"name"属性映射到PersonDTO对象的"fullName"属性，将Person对象的"age"属性映射到PersonDTO对象的"age"属性。

接下来，我们可以编写测试代码，使用Dozer来进行对象之间的转换。在src/test/java目录下创建一个名为"MapperTest.java"的文件，内容如下：

package com.example;

import org.dozer.DozerBeanMapper;
import org.dozer.Mapper;
import org.junit.Test;

import static org.junit.Assert.assertEquals;

public class MapperTest {
    @Test
    public void testMapping() {
        Mapper mapper = new DozerBeanMapper();
        Person person = new Person("John", 30);
        PersonDTO personDTO = mapper.map(person, PersonDTO.class);
        assertEquals("John", personDTO.getFullName());
        assertEquals(30, personDTO.getAge());
    }
}

这个测试代码创建了一个DozerBeanMapper对象，然后使用它来将Person对象转换为PersonDTO对象，并且验证了转换结果是否正确。

最后，我们可以运行测试代码，检查结果是否符合预期。如果一切正常，那么我们已经成功地使用Dozer进行了对象之间的转换。

用springboot springsecurity mybatisplus写一个登录以及退出的权限设置 含有domain层 controller层 service层以及mapper层

好的，下面是一个简单的示例代码：

1. 首先，创建一个User实体类，用于存储用户信息

package com.example.demo.domain;

import lombok.Data;

@Data
public class User {
    private Long id;
    private String username;
    private String password;
    private String role;
}

2. 创建一个UserMapper接口，用于操作数据库

package com.example.demo.mapper;

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.example.demo.domain.User;
import org.apache.ibatis.annotations.Mapper;

@Mapper
public interface UserMapper extends BaseMapper<User> {
}

3. 创建一个UserService接口及其实现类，用于处理业务逻辑

package com.example.demo.service;

import com.baomidou.mybatisplus.extension.service.IService;
import com.example.demo.domain.User;

public interface UserService extends IService<User> {
    User getUserByUsername(String username);
}

package com.example.demo.service.impl;

import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.example.demo.domain.User;
import com.example.demo.mapper.UserMapper;
import com.example.demo.service.UserService;
import org.springframework.stereotype.Service;

@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements UserService {

    @Override
    public User getUserByUsername(String username) {
        return lambdaQuery().eq(User::getUsername, username).one();
    }
}

4. 创建一个WebSecurityConfig类，用于配置Spring Security

package com.example.demo.config;

import com.example.demo.handler.CustomAuthenticationFailureHandler;
import com.example.demo.handler.CustomAuthenticationSuccessHandler;
import com.example.demo.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
import org.springframework.security.config.annotation.method.configuration.EnableGlobalMethodSecurity;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.security.crypto.password.PasswordEncoder;

@Configuration
@EnableWebSecurity
@EnableGlobalMethodSecurity(prePostEnabled = true)
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {

    @Autowired
    private UserService userService;

    @Autowired
    private CustomAuthenticationSuccessHandler customAuthenticationSuccessHandler;

    @Autowired
    private CustomAuthenticationFailureHandler customAuthenticationFailureHandler;

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http.authorizeRequests()
                .antMatchers("/", "/login").permitAll()
                .anyRequest().authenticated()
                .and()
                .formLogin()
                .loginPage("/login")
                .successHandler(customAuthenticationSuccessHandler)
                .failureHandler(customAuthenticationFailureHandler)
                .permitAll()
                .and()
                .logout()
                .logoutSuccessUrl("/")
                .permitAll();
    }

    @Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception {
        auth.userDetailsService(userDetailsService()).passwordEncoder(passwordEncoder());
    }

    @Bean
    public UserDetailsService userDetailsService() {
        return username -> userService.getUserByUsername(username);
    }

    @Bean
    public PasswordEncoder passwordEncoder() {
        return new BCryptPasswordEncoder();
    }
}

5. 创建一个CustomAuthenticationSuccessHandler类和一个CustomAuthenticationFailureHandler类，用于处理登录成功和登录失败的逻辑

package com.example.demo.handler;

import org.springframework.security.core.Authentication;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.web.authentication.SimpleUrlAuthenticationSuccessHandler;
import org.springframework.stereotype.Component;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@Component
public class CustomAuthenticationSuccessHandler extends SimpleUrlAuthenticationSuccessHandler {

    @Override
    public void onAuthenticationSuccess(HttpServletRequest request, HttpServletResponse response,
                                        Authentication authentication) throws IOException, ServletException {
        UserDetails userDetails = (UserDetails) authentication.getPrincipal();
        request.getSession().setAttribute("username", userDetails.getUsername());
        super.onAuthenticationSuccess(request, response, authentication);
    }
}

package com.example.demo.handler;

import org.springframework.security.authentication.BadCredentialsException;
import org.springframework.security.core.AuthenticationException;
import org.springframework.security.web.authentication.SimpleUrlAuthenticationFailureHandler;
import org.springframework.stereotype.Component;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@Component
public class CustomAuthenticationFailureHandler extends SimpleUrlAuthenticationFailureHandler {

    @Override
    public void onAuthenticationFailure(HttpServletRequest request, HttpServletResponse response,
                                        AuthenticationException exception) throws IOException, ServletException {
        if (exception.getClass().isAssignableFrom(BadCredentialsException.class)) {
            response.sendRedirect("/login?error=1");
        } else {
            super.onAuthenticationFailure(request, response, exception);
        }
    }
}

6. 创建一个UserController类，用于处理登录和退出的请求

package com.example.demo.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;

@Controller
public class UserController {

    @GetMapping("/")
    public String index() {
        return "index";
    }

    @GetMapping("/login")
    public String login() {
        return "login";
    }

    @PostMapping("/logout")
    public String logout() {
        return "redirect:/";
    }
}

7. 最后，创建一个login.html页面和一个index.html页面，用于展示登录和退出的效果

login.html：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Login</title>
</head>
<body>
<h1>Login</h1>
<form action="/login" method="post">
    <p><label>Username:</label> <input type="text" name="username"></p>
    <p><label>Password:</label> <input type="password" name="password"></p>
    <p><input type="submit" value="Login"></p>
</form>
<c:if test="${param.error != null}">
    <p style="color: red">Incorrect username or password.</p>
</c:if>
</body>
</html>

index.html：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Index</title>
</head>
<body>
<h1>Hello, ${sessionScope.username}!</h1>
<form action="/logout" method="post">
    <p><input type="submit" value="Logout"></p>
</form>
</body>
</html>

以上就是一个简单的Spring Boot + Spring Security + MyBatis Plus的登录以及退出的权限设置示例代码。