validation

.gitignore

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+HELP.md
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**
+!**/src/test/**
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+
+### VS Code ###
+.vscode/
+.iml
+mvnw
+mvnw.cmd
+HELP.md
+.idea
+.mvn

pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>2.1.6.RELEASE</version>
+        <relativePath/> <!-- lookup parent from repository -->
+    </parent>
+    <groupId>com.soccergao</groupId>
+    <artifactId>spring-web-demo</artifactId>
+    <version>0.0.1-SNAPSHOT</version>
+    <name>spring-web-demo</name>
+    <description>Demo project for Spring Boot</description>
+
+    <properties>
+        <java.version>1.8</java.version>
+        <swagger-version>2.9.2</swagger-version>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-devtools</artifactId>
+            <scope>runtime</scope>
+            <optional>true</optional>
+        </dependency>
+        <dependency>
+            <groupId>org.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+            <optional>true</optional>
+        </dependency>
+
+        <dependency>
+            <groupId>io.springfox</groupId>
+            <artifactId>springfox-swagger2</artifactId>
+            <version>${swagger-version}</version>
+        </dependency>
+        <dependency>
+            <groupId>io.springfox</groupId>
+            <artifactId>springfox-swagger-ui</artifactId>
+            <version>${swagger-version}</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+
+</project>

src/main/java/com/soccergao/springwebdemo/SpringWebDemoApplication.java

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+package com.soccergao.springwebdemo;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import springfox.documentation.swagger2.annotations.EnableSwagger2;
+
+@SpringBootApplication
+@EnableSwagger2
+public class SpringWebDemoApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(SpringWebDemoApplication.class, args);
+    }
+
+}

src/main/java/com/soccergao/springwebdemo/exception/GlobalExceptionHandler.java

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+package com.soccergao.springwebdemo.exception;
+
+import org.springframework.http.HttpStatus;
+import org.springframework.validation.ObjectError;
+import org.springframework.web.bind.MethodArgumentNotValidException;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.ResponseStatus;
+import org.springframework.web.bind.annotation.RestControllerAdvice;
+
+import java.util.Set;
+import java.util.stream.Collectors;
+
+@RestControllerAdvice
+public class GlobalExceptionHandler {
+    @ExceptionHandler(MethodArgumentNotValidException.class)
+    @ResponseStatus(HttpStatus.BAD_REQUEST)
+    public Set<String> handleMethodArgumentNotValidException(MethodArgumentNotValidException ex) {
+        return ex
+                .getBindingResult()
+                .getAllErrors()
+                .stream()
+                .map(ObjectError::getDefaultMessage)
+                .collect(Collectors.toSet());
+    }
+}

src/main/java/com/soccergao/springwebdemo/service/UserService.java

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+package com.soccergao.springwebdemo.service;
+
+import com.soccergao.springwebdemo.web.dto.User;
+import org.springframework.stereotype.Service;
+
+import java.time.LocalDateTime;
+import java.util.List;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+@Service
+public class UserService {
+
+    public List<User> query() {
+        return Stream
+                .of(User.builder().id(1L).username("root").password("root").birthday(LocalDateTime.now()).build(),
+                        User.builder().id(2L).username("root").password("root").birthday(LocalDateTime.now()).build())
+                .collect(Collectors.toList());
+
+    }
+
+    public User get(Long userId) {
+        return User.builder()
+                .id(userId)
+                .username("root")
+                .password("root")
+                .birthday(LocalDateTime.now())
+                .build();
+    }
+
+}

src/main/java/com/soccergao/springwebdemo/web/UserController.java

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+package com.soccergao.springwebdemo.web;
+
+import com.fasterxml.jackson.annotation.JsonView;
+import com.soccergao.springwebdemo.service.UserService;
+import com.soccergao.springwebdemo.web.dto.User;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.validation.BindingResult;
+import org.springframework.web.bind.annotation.*;
+
+import javax.validation.Valid;
+import java.util.List;
+
+@RestController
+@RequestMapping("/v1/user")
+public class UserController {
+
+    @Autowired
+    UserService userService;
+
+    @PostMapping
+    public User save(@Valid @RequestBody User user) {
+        user.setId(1L);
+        return user;
+    }
+
+    @JsonView(User.UserDetailView.class)
+    @GetMapping("/{id:\\d+}")
+    public User get(@PathVariable Long id) {
+        return userService.get(id);
+    }
+
+    @JsonView(User.UserSimpleView.class)
+    @GetMapping
+    public List<User> query() {
+        return userService.query();
+    }
+
+
+}
+
+@RestController
+@RequestMapping("/v2/user")
+class UserController2 {
+    @PostMapping
+    public User save(@Valid @RequestBody User user, BindingResult errors) {
+        if (errors != null) {
+            errors.getAllErrors()
+                    .forEach(error -> System.out.println(error.getDefaultMessage()));
+        }
+
+        user.setId(1L);
+        return user;
+    }
+}

src/main/java/com/soccergao/springwebdemo/web/dto/User.java

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+package com.soccergao.springwebdemo.web.dto;
+
+import com.fasterxml.jackson.annotation.JsonView;
+import com.soccergao.springwebdemo.web.validator.PasswordCheck;
+import lombok.Builder;
+import lombok.Data;
+
+import javax.validation.constraints.NotBlank;
+import javax.validation.constraints.Past;
+import java.time.LocalDateTime;
+
+@Data
+@Builder
+public class User {
+
+    @JsonView(UserSimpleView.class)
+    private Long id;
+
+    @JsonView(UserSimpleView.class)
+    @NotBlank(message = "用户名不能为空")
+    private String username;
+
+    @JsonView(UserDetailView.class)
+    @PasswordCheck
+    private String password;
+
+    @JsonView(UserDetailView.class)
+    @Past(message = "生日必须是过去的时间")
+    private LocalDateTime birthday;
+
+//    @JsonView使用方法:
+//    1. 使用接口来声明多个视图
+//    2. 在pojo的get方法上指定视图
+//    3. 在Controller方法上指定视图
+    public interface UserSimpleView {}
+    public interface UserDetailView extends UserSimpleView {}
+}

src/main/java/com/soccergao/springwebdemo/web/validator/PasswordCheck.java

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+package com.soccergao.springwebdemo.web.validator;
+
+import javax.validation.Constraint;
+import javax.validation.Payload;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Target(ElementType.FIELD)
+@Retention(RetentionPolicy.RUNTIME)
+@Constraint(validatedBy = PasswordValidator.class)
+public @interface PasswordCheck {
+    int value() default 8;
+
+    String message() default "密码格式错误";
+
+    Class<?>[] groups() default { };
+
+    Class<? extends Payload>[] payload() default { };
+}

src/main/java/com/soccergao/springwebdemo/web/validator/PasswordValidator.java

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+package com.soccergao.springwebdemo.web.validator;
+
+import javax.validation.ConstraintValidator;
+import javax.validation.ConstraintValidatorContext;
+
+/**
+ * 该类会交给spring管理
+ * ConstraintValidator<PasswordCheck, String>中的String是字段的类型
+ * 如: private String password 中的String;
+ */
+public class PasswordValidator implements ConstraintValidator<PasswordCheck, String> {
+
+    private int value;
+
+    @Override
+    public void initialize(PasswordCheck constraintAnnotation) {
+        value = constraintAnnotation.value();
+    }
+
+    @Override
+    public boolean isValid(String value, ConstraintValidatorContext context) {
+        return value.length() >= this.value;
+    }
+}

src/main/resources/application.yml

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+spring:
+  application:
+    name: spring-web-demo
+
+server:
+  port: 8090
+  servlet:
+    context-path: /

src/test/java/com/soccergao/springwebdemo/SpringWebDemoApplicationTests.java

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+package com.soccergao.springwebdemo;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.junit4.SpringRunner;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest
+public class SpringWebDemoApplicationTests {
+
+    @Test
+    public void contextLoads() {
+    }
+
+}