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| |
| <h2 id="_1">场景描述</h2> |
| <p>用户在provider端使用参数效验，可以对相应的参数输入要求预先进行设置，在接口实际调用前进行效验处理，达到控制参数输入标准的效果。</p> |
| <h2 id="_2">配置说明</h2> |
| <ul> |
| <li> |
| <p>添加swagger-invocation-validator的pom依赖：</p> |
| <pre><code>```xml |
| <dependency> |
| <groupId>org.apache.servicecomb</groupId> |
| <artifactId>swagger-invocation-validator</artifactId> |
| </dependency> |
| ``` |
| </code></pre> |
| </li> |
| <li> |
| <p>在需要验证的代码上按照JSR 349规范添加验证器注解，如@NotNull，@Min，@Max等。</p> |
| </li> |
| </ul> |
| <h2 id="_3">示例代码</h2> |
| <ul> |
| <li>接口参数验证</li> |
| </ul> |
| <pre><code class="language-java">@RestSchema(schemaId = "validator") |
| @Path("/validator") |
| @Produces(MediaType.APPLICATION_JSON) |
| public class Validator { |
| |
| @Path("/add") |
| @POST |
| public int add(@FormParam("a") int a, @Min(20) @FormParam("b") int b) { |
| return a + b; |
| } |
| |
| @Path("/sayhi/{name}") |
| @PUT |
| public String sayHi(@Length(min = 3) @PathParam("name") String name) { |
| ContextUtils.getInvocationContext().setStatus(202); |
| return name + " sayhi"; |
| } |
| |
| @Path("/sayhello") |
| @POST |
| public Student sayHello(@Valid Student student) { |
| student.setName("hello " + student.getName()); |
| student.setAge(student.getAge()); |
| return student; |
| } |
| } |
| </code></pre> |
| <ul> |
| <li>bean类验证</li> |
| </ul> |
| <p>需要在传入的Student对象前加@Valid，如上图sayHello(@Valid Student student)方法。</p> |
| <pre><code class="language-java">public class Student { |
| @NotNull |
| private String name; |
| |
| @Max(20) |
| private int age; |
| |
| public void setName(String name) { |
| this.name = name; |
| } |
| |
| public String getName() { |
| return this.name; |
| } |
| |
| public void setAge(int age) { |
| this.age = age; |
| } |
| |
| public int getAge() { |
| return age; |
| } |
| } |
| </code></pre> |
| <h2 id="_4">自定义返回异常</h2> |
| <ul> |
| <li>默认的参数效验器ParameterValidator已经实现了接口ProducerInvokeExtension，按照JSR 349规范处理所需的参数验证。</li> |
| </ul> |
| <p>如果任何参数验证失败，缺省错误是BAD_REQUEST(400, "Bad Request")。</p> |
| <p>返回错误支持自定义扩展，使用SPI机制。</p> |
| <ul> |
| <li> |
| <p>可以通过实现接口ExceptionToProducerResponseConverter来自定义返回的错误信息，以ConstraintViolationExceptionToProducerResponseConverter为例。</p> |
| </li> |
| <li> |
| <p>实现ExceptionToProducerResponseConverter接口，重写方法，其中getOrder方法的返回结果表示该验证器的优先级，值越小优先级越高。</p> |
| <p>```java |
| public class ConstraintViolationExceptionToProducerResponseConverter |
| implements ExceptionToProducerResponseConverter<ConstraintViolationException> { |
| @Override |
| public Class<ConstraintViolationException> getExceptionClass() { |
| return ConstraintViolationException.class; |
| }</p> |
| <p>@Override |
| public Response convert(SwaggerInvocation swaggerInvocation, ConstraintViolationException e) { |
| return Response.createFail(new InvocationException(Status.BAD_REQUEST, e.getConstraintViolations().toString())); |
| }</p> |
| <p>@Override |
| public int getOrder() { |
| return -100; |
| } |
| } |
| ```</p> |
| </li> |
| <li> |
| <p>在META-INF下的services文件夹增加一个文件，以所实现接口x.x.x.ExceptionToProducerResponseConverter(带包名)为名，以具体实现类x.x.x.ConstraintViolationExceptionToProducerResponseConverter(带包名)为内容。</p> |
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