java使用validator检验bean

一

介绍，首先大家常用的hibernate-validator，它是对JSR-303/JSR-349标准的实现，然后spring为了给开发者提供便捷集成了hibernate-validator，默认在springMVC模块下。

二

依赖

首先加上web模块

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

　　可以查看它的子依赖，就可以看到web模块默认使用了hibernate-validator：

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"
 3     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
 4   <modelVersion>4.0.0</modelVersion>
 5   <parent>
 6     <groupId>org.springframework.boot</groupId>
 7     <artifactId>spring-boot-starters</artifactId>
 8     <version>2.1.6.RELEASE</version>
 9   </parent>
10   <groupId>org.springframework.boot</groupId>
11   <artifactId>spring-boot-starter-web</artifactId>
12   <version>2.1.6.RELEASE</version>
13   <name>Spring Boot Web Starter</name>
14   <description>Starter for building web, including RESTful, applications using Spring
15         MVC. Uses Tomcat as the default embedded container</description>
16   <url>https://projects.spring.io/spring-boot/#/spring-boot-parent/spring-boot-starters/spring-boot-starter-web</url>
17   <organization>
18     <name>Pivotal Software, Inc.</name>
19     <url>https://spring.io</url>
20   </organization>
21   <licenses>
22     <license>
23       <name>Apache License, Version 2.0</name>
24       <url>https://www.apache.org/licenses/LICENSE-2.0</url>
25     </license>
26   </licenses>
27   <developers>
28     <developer>
29       <name>Pivotal</name>
30       <email>[email protected]</email>
31       <organization>Pivotal Software, Inc.</organization>
32       <organizationUrl>https://www.spring.io</organizationUrl>
33     </developer>
34   </developers>
35   <scm>
36     <connection>scm:git:git://github.com/spring-projects/spring-boot.git/spring-boot-starters/spring-boot-starter-web</connection>
37     <developerConnection>scm:git:ssh://[email protected]/spring-projects/spring-boot.git/spring-boot-starters/spring-boot-starter-web</developerConnection>
38     <url>https://github.com/spring-projects/spring-boot/spring-boot-starters/spring-boot-starter-web</url>
39   </scm>
40   <issueManagement>
41     <system>Github</system>
42     <url>https://github.com/spring-projects/spring-boot/issues</url>
43   </issueManagement>
44   <dependencies>
45     <dependency>
46       <groupId>org.springframework.boot</groupId>
47       <artifactId>spring-boot-starter</artifactId>
48       <version>2.1.6.RELEASE</version>
49       <scope>compile</scope>
50     </dependency>
51     <dependency>
52       <groupId>org.springframework.boot</groupId>
53       <artifactId>spring-boot-starter-json</artifactId>
54       <version>2.1.6.RELEASE</version>
55       <scope>compile</scope>
56     </dependency>
57     <dependency>
58       <groupId>org.springframework.boot</groupId>
59       <artifactId>spring-boot-starter-tomcat</artifactId>
60       <version>2.1.6.RELEASE</version>
61       <scope>compile</scope>
62     </dependency>
63     <dependency>
64       <groupId>org.hibernate.validator</groupId>
65       <artifactId>hibernate-validator</artifactId>
66       <version>6.0.17.Final</version>
67       <scope>compile</scope>
68     </dependency>
69     <dependency>
70       <groupId>org.springframework</groupId>
71       <artifactId>spring-web</artifactId>
72       <version>5.1.8.RELEASE</version>
73       <scope>compile</scope>
74     </dependency>
75     <dependency>
76       <groupId>org.springframework</groupId>
77       <artifactId>spring-webmvc</artifactId>
78       <version>5.1.8.RELEASE</version>
79       <scope>compile</scope>
80     </dependency>
81   </dependencies>
82 </project>

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三

注解jsr

hibernate-validator注解

@NotBlank(message =) 验证字符串非null，且长度必须大于0

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@Email 被注释的元素必须是电子邮箱地址

@Length(min=,max=) 被注释的字符串的大小必须在指定的范围内

@NotEmpty 被注释的字符串的必须非空

@Range(min=,max=,message=) 被注释的元素必须在合适的范围内