1.rest风格
2.@Pathvariable注解
2.1配置正则实例
@AllArgsConstructor
@NoArgsConstructor
@Data
@Accessors(chain = true) //lombok
public class User implements Serializable {
private String name;
}
@RestController //responsebody +controller
public class UserController {
@GetMapping("/user/{name:.*}")
public User testUser(@PathVariable(required = false,value = "name") User user){
System.out.println(user.getClass());
return user;
}
}
@SpringBootApplication
public class MvcDemoApplication {
public static void main(String[] args) {
SpringApplication.run(MvcDemoApplication.class, args);
}
}
@Configuration
@ComponentScan(value = "springmvc.demo")//扫描包
public class MVCConfig {
}
spring.http.encoding.charset=UTF-8 #处理编码 spring.http.encoding.force=true spring.http.encoding.enabled=true server.tomcat.uri-encoding=UTF-8
3.@valid与@Validated
@valid与@Validated的区别，@Validated是spring中的，是在@valid基础上而来的，在@valid的基础上增加分组功能，这里就直接说@Validated，没有加分组都需要认证，加了分组只有符合分组的才需要认证，一般不使用分组
3.1基本使用
@AllArgsConstructor
@NoArgsConstructor
@Data
@Accessors(chain = true)
public class User implements Serializable {
@NotNull(message="不能为空")//含有属性groups
private String name;
}
@RestController
public class UserController {
@GetMapping("/user")
public User testUser(@Validated User user, BindingResult result){
result.getAllErrors().stream().forEach((x)->{
System.out.println(x.getObjectName()+":"+x.getDefaultMessage());
});
System.out.println(user.getClass());
return user;
}
}
输出结果：user:不能为空
备注：假如没有BindingResult result，那么在进入testUser之前就会被拦截，message="不能为空"并没有什么作用，加入BindingResult result之后，才会进入testUser方法，在没有进入方法时的异常页面见后该篇4
3.2自定义符合valid的注解
这里定义的是@NoNull注解
//会自动加载，不需要其他的配置
public class MyValidAnnotation implements ConstraintValidator<MyNotNull,Object> {
/*
obj:需要验证的参数
*/
@Override
public boolean isValid(Object obj, ConstraintValidatorContext constraintValidatorContext) {
System.out.println(obj);
return false;
}
@Override
public void initialize(MyNotNull constraintAnnotation) {
}
}
@Target({ElementType.METHOD, ElementType.FIELD})
@Retention(RetentionPolicy.RUNTIME)
@Constraint(validatedBy =MyValidAnnotation.class )
public @interface MyNotNull {
String message() default "{javax.validation.constraints.NotNull.message}";
Class<?>[] groups() default {};
Class<? extends Payload>[] payload() default {};
}
@AllArgsConstructor
@NoArgsConstructor
@Data
@Accessors(chain = true)
public class User implements Serializable {
@MyNotNull(message="不能为空---MyNotNull")
private String name;
}
@RestController
public class UserController {
@GetMapping("/user")
public User testUser(@Validated User user, BindingResult result){
result.getAllErrors().stream().forEach((x)->{
System.out.println(x.getObjectName()+":"+x.getDefaultMessage());
});
return user;
}
}
4.异常消息的处理
4.1验证异常消息的处理上述已经说明
4.2直接被拦截的异常处理
springboot会相应的转向我们在resources下新建的resources的error的相应的错误代码的页面
还可以是如下这样，表示以4开头的错误页面
4.3运行过程中出现的异常
4.3.1直接抛出异常
@GetMapping("/user/error")
public User testUser1(@Validated User user, BindingResult result) throws Exception {
throw new Exception("出错了");
}
4.3.2 throw自定义异常类
@ResponseStatus(value = HttpStatus.INTERNAL_SERVER_ERROR,reason = "内部出错了！")
public class MyException extends RuntimeException {
}
@GetMapping("/user/error")
public User testUser1(@Validated User user, BindingResult result) throws Exception {
throw new MyException();
}
4.3.3 使用@ExceptionHandler注解
@ResponseBody
@GetMapping("/testExceptionHandler")
public User testUser1(@Validated User user, BindingResult result) throws Exception {
int i=10/0;
return user;
}
@ExceptionHandler({Exception.class})
public String testExceptionHandler(){
return "redirect:/error.html"; //重定向
}
4.3.4 修改状态码及原因，@ResponseStatus也能在
@ExceptionHandler({Exception.class})
@ResponseStatus(value = HttpStatus.INTERNAL_SERVER_ERROR,reason = "内部错误")
public void testExceptionHandler(){
}
备注：这样之后不会去相应的页面，也就是加入有返回值例如return "redirect:/error.html";，会失效
4.3.5@ControllerAdvice定制全局的异常，类中的@ExceptionHandler优先级高于@ControllerAdvice中的@ExceptionHandler优先级
@ControllerAdvice
public class MyExceptionHandler {
@ExceptionHandler({Exception.class})
@ResponseStatus(value = HttpStatus.INTERNAL_SERVER_ERROR,reason = "内部错误")
public void testExceptionHandler(){
}
}
5.jsonview
原文：https://www.cnblogs.com/gg128/p/9940941.html