/*  
* 请求处理类  
* */  
@RestController  
public class HelloController {  
    /*  
    * 响应返回值  
    * */    @RequestMapping("/Hello")  
    public String Hello(String name){  
        System.out.println("name:"+name);  
        return "Hello" + name + "~";  
    }  
}

@RestController  
public class RequestController {  
    @RequestMapping("/request")  
    public String request(HttpServletRequest request) {  
        //获取请求方式  
        String method = request.getMethod();  
        System.out.println("请求方式:" + method);  
        //获取请求url地址  
        String url = request.getRequestURL().toString();
        //http://localhost:8080/request  
        
        System.out.println("请求url地址:" + url);  
        String uri = request.getRequestURI();//request  
        System.out.println("请求uri地址:" + uri);  
  
        //获取请求协议  
        String protocol = request.getProtocol();  
        System.out.println("请求协议:" + protocol);  
        //获取请求参数 - name        
        String name = request.getParameter("name");  
        String age = request.getParameter("age");  
        System.out.println("请求参数name:" + name + ",age:" + age);  
  
        //获取请求头 - Accept        
        String accept = request.getHeader("Accept");  
        System.out.println("请求头Accept:" + accept);  
          
        return "OKK";  
    }  
}

@RestController  
public class ResponseController {  
    @RequestMapping("/response")  
    public void response(HttpServletResponse response) throws IOException {  
        //设置响应状态码  
        response.setStatus(401);  
        //设置响应头  
        response.setHeader("name","itcast");  
        //设置响应体  
        response.getWriter().write("<h1>Hello Response</h1>");  
        //  
    }  
    /*  
    * 方法二  
    * 基于ResponseEntity构建响应对象  
    * */    @RequestMapping("/response2")  
    public ResponseEntity<String> response2(){  
        return ResponseEntity  
                .status(401)  
                .header("name","javaweb")  
                .body("<h1>Hello ResponseEntity</h1>");  
    }  
}

//UserController
/*  
 * 用户信息Controller  
 * */@RestController  
public class UserController {  
    @RequestMapping("/list")  
    public List<User> list() throws FileNotFoundException {  
        //加载并读取user.txt  
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("user.txt");  
        ArrayList<String> lines = IoUtil.readLines  
                (in, StandardCharsets.UTF_8, new ArrayList<>());  
        //解析用户信息，封装为User对象，list集合  
        List<User> userList = lines.stream().map(line -> {  
            String[] parts = line.split(",");  
            Integer id = Integer.parseInt(parts[0]);  
            String username = parts[1];  
            String password = parts[2];  
            String name = parts[3];  
            Integer age = Integer.parseInt(parts[4]);  
            LocalDateTime updateTime = LocalDateTime.parse(parts[5], DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"));  
            return new User(id, username, password, name, age, updateTime);  
        }).toList();  
  
        //返回数据json  
        return userList;  
    }  
}

//User
@Data  
@NoArgsConstructor  //  
@AllArgsConstructor //全参  
public class User {  
    private Integer id;  
    private String username;  
    private String password;  
    private String name;  
    private Integer age;  
    private LocalDateTime updateTime;  
  
}

/*  
 * 用户信息Controller  
 * */@RestController  
public class UserController {  
    private UserService userService = new UserServiceImpl();  
    *多态的实现*
    @RequestMapping("/list")  
    public List<User> list() throws FileNotFoundException {  
        
        List<User> list = userService.findAll();  
        *多态的实现*
        
        return list;  
    }  
}

//接口
public interface UserService {  
    /*  
    *查询所有用户信息  
    * */   
    public List<User>  findAll();  
}

//实现类
//带impl就是一个实现类  
public class UserServiceImpl implements UserService {  
    private UserDao userDao = new UserDaoImpl();  
	*多态的实现*
    @Override  
    public List<User> findAll() {  
        List<String> lines = userDao.findAll();  
        *多态的实现*
        
        List<User> userList = lines.stream().map(line -> {  
            String[] parts = line.split(",");  
            Integer id = Integer.parseInt(parts[0]);  
            String username = parts[1];  
            String password = parts[2];  
            String name = parts[3];  
            Integer age = Integer.parseInt(parts[4]);  
            LocalDateTime updateTime = LocalDateTime.parse(parts[5], DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"));  
            return new User(id, username, password, name, age, updateTime);  
        }).toList();  
        return userList;  
    }  
}

//接口
public interface UserDao {  
    /*  
    * 加载用户数据  
    * */    
    public List<String> findAll();  
}

//实现类
public class UserDaoImpl implements UserDao {  
    @Override  
    public List<String> findAll() {  
    
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("user.txt");  
        
        ArrayList<String> lines = IoUtil.readLines  
                (in, StandardCharsets.UTF_8, new ArrayList<>());  
  
        return lines;  
    }  
  
}