java - MessageBodyReader 支持 DTO 类吗？

Question

我想使用 Grails-jaxrs plugin实现自定义 MessageBodyReaderSupport从客户端读取 UserDto 类。

如何实现 UserDtoReader 才能获取 UserDto 的实例？

这是我的 UserDto 类:

public class UserDto {
    private String firstName;
    private String lastName;

    public UserDto() {
        firstName = "";
        lastName = "";
    }

    public UserDto(String firstName,
                   String lastName) {

        this.firstName = firstName;
        this.lastName = lastName;
    }

    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }


    @Override
    public String toString() {
        String s = " { User ";
        s += "id=" + id + " ";
        s += "firstName=" + firstName + " ";
        s += "lastName=" + lastName + " ";
        s += " User } ";
        return s;
    }
}

这是我的 UserDtoReader 类:

@Consumes("application/json")
class UserDtoReader extends MessageBodyReaderSupport<UserDto> {

    @Override
    public UserDto readFrom(MultivaluedMap<String, String> httpHeaders,
            InputStream entityStream) throws IOException,
            WebApplicationException {
        // TODO Auto-generated method stub
        return null;
    }
}

Answer 1

使用这个:

@Consumes("application/json")
class UserDtoReader extends MessageBodyReaderSupport<UserDto> {

    @Override
    public UserDto readFrom(MultivaluedMap<String, String> httpHeaders,
            InputStream entityStream) throws IOException,
            WebApplicationException {
        return new JsonSlurper().parse(new InputStreamReader(entityStream))
    }
}