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使用Hibernate_Validator进行数据校验,好处不言而喻:规范统一,低耦合度。
1、pom.xml
<dependency> <groupId>org.hibernate</groupId> <artifactId>hibernate-validator</artifactId> <version>5.0.1.Final</version> </dependency> <dependency> <groupId>org.jboss.resteasy</groupId> <artifactId>resteasy-validator-provider-11</artifactId> <version>3.0.9.Final</version> </dependency>
2、添加约束注解,目标元素可以是字段(变量)、属性(getter方法)或者类型等
在需要进行校验的变量或者属性(domain里面的)添加约束注解
UserService.java
@Path("UserService") public class UserService { @Size(min = 2, max = 4) @PathParam("s") String s; @POST @Path("{s}/user") @Produces("application/json;charset=UTF-8") public String adduser(@Valid User user) { //System.out.print(VALIDATION_HEADER); return user.getEmail(); } }
User.java
@XmlRootElement(name = "User") public class User { @NotNull @Pattern(regexp="[0-9]+",message="id必须为数字") @Size(min = 2, max = 4) private String name; private String pwd; @Email private String email; getset略 }
3、捕获检验异常和message并输出
resteasy框架为api的异常处理,提供了一个统一的接口,ExceptionMapper<Exception>,我们可以定义一个handler来实现这个接口,就可以捕获resteasy api的异常。如下面的代码:
ValidationExceptionHandlerREST.java
@Provider public class ValidationExceptionHandlerREST implements ExceptionMapper<ResteasyViolationException > { @Override public Response toResponse(ResteasyViolationException exception) { //获取校验失败的反馈信息 Map<String, String> violations = new HashMap<String, String>(); for (ResteasyConstraintViolation violation : exception.getViolations()) { violations.put(violation.getPath(), violation.getMessage()); } System.out.print("Violation error"); return Response.status(Status.BAD_REQUEST).entity(violations).build(); } }
另外我们需要使用此handler,所以我们在web.xml中启用它。如下面的配置:
<context-param> <param-name>resteasy.providers</param-name> <param-value>cn.itcast.ValidatorException.ValidationExceptionHandlerREST</param-value> </context-param>
4、最后
<context-param> <param-name>resteasy.resources</param-name> <param-value>cn.itcast.service.test,cn.itcast.service.UserService</param-value> </context-param>
5、测试
源码下载
RestEasy_03_Hibernate_Validator.rar
RestEasy 3.x 系列之四:使用Hibernate_Validator进行数据校验
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原文地址:http://www.cnblogs.com/lxsky/p/4498982.html