Spring MVC的數據綁定：綁定參數爲對象場不同的名稱

Question

這裏是我的@Controller：

@RequestMapping(value = "/add") 
    public void addMember(Member member) { 
     // ... ... 
    } 

這裏是Member類：

class Member { 
    private Integer id; 
    private String username; 

    // ... ... 
} 

，這裏是請求的URL：

/add?memberId=1&username=bruce 

如何將memberId參數綁定到Member.id f ield？ 謝謝！

Answer 1

如果你不想使用

@RequestMapping(value = "/add") 
public void addMember(@RequestParam(value = "username") String username, ...) { 
    Member member = new Member(username, ...) 
    // ... 
} 

可以實現HandlerMethodArgumentResolver：

public class MemberHandlerMethodArgumentResolver implements HandlerMethodArgumentResolver { 
    @Override 
    public boolean supportsParameter(MethodParameter parameter) { 
     return Member.class.equals(parameter.getParameterType()); 
    } 

    @Override 
    public Object resolveArgument(MethodParameter parameter, ModelAndViewContainer mavContainer, 
     NativeWebRequest webRequest, WebDataBinderFactory binderFactory) throws Exception { 
     String username = webRequest.getParameter("username"); 
     ... 
     return new Member(username, ...); 
    } 
} 

而且在配置：

<mvc:annotation-driven> 
    <mvc:argument-resolvers> 
     <bean id="memberResolver" class="com.company ... MemberHandlerMethodArgumentResolver"/> 
    </mvc:argument-resolvers> 
</mvc:annotation-driven> 

或JavaConfi G：

@Configuration 
@EnableWebMvc 
public class WebConfig extends WebMvcConfigurerAdapter { 
... 
    @Override 
    public void addArgumentResolvers(List<Handlermethodargumentresolver> argumentResolvers) { 
     argumentResolvers.add(new MemberHandlerMethodArgumentResolver()); 
    } 
} 

Answer 2

您可以使用@JsonProperty它的註釋。如下所示。

class Member { 
    @JsonProperty("memberId") 
    private Integer id; 
    private String username; 

    // ... ... 
} 

Answer 3

恕我直言，這樣做最簡單的方法是Member類使用額外的二傳手：

class Member { 
    private Integer id; 
    private String username; 

    public Integer getId() { 
     return id; 
    } 
    public void setId(Integer id) { 
     this.id = id; 
    } 
    public void setMemberId(Integer memberId) { // this one should to the trick 
     this.id = memberId; 
    } 

    // ... ... 
}