springMvc入门配置Validation

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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";    }

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