springMvc入门配置Validation

参考spring-framework-reference.pdf

8.8 Spring Validation小节

21.16 Configuring Spring MVC的Validation小节
http://hibernate.org/validator/documentation/
1.pom.xml添加以下依赖

<dependency>
<groupId>javax.el</groupId>
<artifactId>javax.el-api</artifactId>
<version>2.2.5</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-validator</artifactId>
<version>5.2.2.Final</version>
</dependency>
<dependency>
<groupId>org.glassfish.web</groupId>
<artifactId>javax.el</artifactId>
<version>2.2.6</version>
</dependency>

2.配置Bean

a.在AppConfig.java的RootApplicationContext配置一个Validator

@Bean
public LocalValidatorFactoryBean validator(){
return new LocalValidatorFactoryBean();
}

b.在继承WebMvcConfigurerAdapter的MvcConfig,重写getValidator方法

@Autowired
private Validator validator;
@Override
public Validator getValidator() {
return validator;
}

如果考虑只在web层做校验,也可以直接在WebApplicationContext声明Validator Bean,然后直接使用此Bean,同样也重写getValidator方法

3.使用:

a.声明约束,比如User有一个字段username.

@NotNull
@Size(min = 6, max = 14 ,message = "The username '${validatedValue}' must be between {min} and {max} characters long")
private String username;

b.在Controller的方法参数做校验.

@RequestMapping("/")
public String index(Model model,@Valid User user,BindingResult br){
if (br.hasErrors()){
for (ObjectError objectError : br.getAllErrors()) {
System.out.println("objectError = " + objectError);
}
}
List<String> list= Arrays.asList("list1","list2","list3");
model.addAttribute("list",list);
return "user/index";
}