Javassm - SpringBoot4

@SpringBootTest
class SpringBootTestApplicationTests {

    // JavaMailSender是专门用于发送邮件的对象，自动配置类已经提供了Bean
    @Autowired
    JavaMailSender sender;

    @Test
    void contextLoads() {
        // SimpleMailMessage是一个比较简易的邮件封装，支持设置一些比较简单内容
        SimpleMailMessage message = new SimpleMailMessage();
        //设置邮件标题
        message.setSubject("PENGUIN!!");
        //设置邮件内容
        message.setText("penguin!!");
          //设置邮件发送给谁，可以多个，这里就发给你的QQ邮箱
        message.setTo("XXXX@qq.com");
          //邮件发送者，这里要与配置文件中的保持一致
        message.setFrom("javastudy111@163.com");
          //OK，万事俱备只欠发送
        sender.send(message);
    }

}

@Test
void contextLoads() throws MessagingException {
      //创建一个MimeMessage
    MimeMessage message = sender.createMimeMessage();
      //使用MimeMessageHelper来帮我们修改MimeMessage中的信息
    MimeMessageHelper helper = new MimeMessageHelper(message, true);
    helper.setSubject("Test");
    helper.setText("lbwnb");
    helper.setTo("你的QQ号@qq.com");
    helper.setFrom("javastudy111@163.com");
      //发送修改好的MimeMessage
    sender.send(message);
}

@ResponseBody
@PostMapping("/submit")
public String submit(String username,
                     String password){
    System.out.println(username.substring(3));
    System.out.println(password.substring(2, 10));
    return "请求成功!";
}

@ResponseBody
@PostMapping("/submit")
public String submit(String username,
                     String password){
    if(username.length() > 3 && password.length() > 10) {
        System.out.println(username.substring(3));
        System.out.println(password.substring(2, 10));
        return "请求成功!";
    } else {
        return "请求失败";
    }
}

@Slf4j
@Validated   //首先在Controller上开启接口校验
@Controller
public class TestController {

    ...

    @ResponseBody
    @PostMapping("/submit")
    //使用@Length注解一步到位
    public String submit(@Length(min = 3) String username,  
                         @Length(min = 10) String password){
        System.out.println(username.substring(3));
        System.out.println(password.substring(2, 10));
        return "请求成功!";
    }
}

@ControllerAdvice
public class ValidationController {

    @ResponseBody
    @ExceptionHandler(ConstraintViolationException.class)
    public String error(ValidationException e){
        return e.getMessage();   //出现异常直接返回消息
    }
}

@Data
public class Account {
    String username;
    String password;
}

@ResponseBody
@PostMapping("/submit")
public String submit(Account account){   //直接使用对象接收
    System.out.println(account.getUsername().substring(3));
    System.out.println(account.getPassword().substring(2, 10));
    return "请求成功!";
}

@ResponseBody
@PostMapping("/submit")  
// 在参数上添加@Valid注解表示需要验证
public String submit(@Valid Account account){
    System.out.println(account.getUsername().substring(3));
    System.out.println(account.getPassword().substring(2, 10));
    return "请求成功!";
}

@Data
public class Account {
    @Length(min = 3)   //只需要在对应的字段上添加校验的注解即可
    String username;
    @Length(min = 10)
    String password;
}

@ResponseBody
@ExceptionHandler({ConstraintViolationException.class, MethodArgumentNotValidException.class})
public String error(Exception e){
    if(e instanceof ConstraintViolationException exception) {
        return exception.getMessage();
    } else if(e instanceof MethodArgumentNotValidException exception){
        if (exception.getFieldError() == null) return "未知错误";
        return exception.getFieldError().getDefaultMessage();
    }
    return "未知错误";
}

@Configuration
public class SwaggerConfigutaion {
    @Bean
    public OpenAPI springDocOpenAPI() {
            return new OpenAPI().info(new Info()
                .title("图书管理系统 - 在线API接口文档")   //设置API文档网站标题
                .description("这是一个图书管理系统的后端API文档，欢迎前端人员查阅！") //网站介绍
                .version("2.0")   //当前API版本
                .license(new License().name("我的B站个人主页")  //遵循的协议，这里拿来写其他的也行
                .url("https://space.bilibili.com/37737161")));
    }
}

//使用@Tag注解来添加Controller描述信息
@Tag(name = "账户验证相关", description = "包括用户登录、注册、验证码请求等操作。")
public class TestController {
    ...
}

@ApiResponses({
       @ApiResponse(responseCode = "200", description = "测试成功"),
       @ApiResponse(responseCode = "500", description = "测试失败")   //不同返回状态码描述
})
@Operation(summary = "请求用户数据测试接口")   //接口功能描述
@ResponseBody
@GetMapping("/hello")
//请求参数描述和样例
public String hello(@Parameter(description = "测试文本数据", example = "KFCvivo50") @RequestParam String text) {
    return "Hello World";
}

@Hidden
@ResponseBody
@GetMapping("/hello")
public String hello() {
    return "Hello World";
}

@Data
@Schema(description = "用户信息实体类")
public class User {
    @Schema(description = "用户编号")
    int id;
    @Schema(description = "用户名称")
    String name;
    @Schema(description = "用户邮箱")
    String email;
    @Schema(description = "用户密码")
    String password;
}

springdoc:
  api-docs:
    enabled: false