Rest服务中作为参数的对象数组

Question

我有一个接收对象数组的rest服务，我需要将json信息转换回对象列表；我的堆栈是建立在Spring4之上的

@RequestMapping(value = "/services/crud/dangers/createDanger", method = RequestMethod.GET)
    public @ResponseBody GenericServiceReturn createDanger(
            @RequestParam(value = "postionId", required = true) Long positionId,
            @RequestParam(value = "dangerName", required = true) String dangerName,
            @RequestParam(value = "type", required = true) Integer type,
            @RequestParam(value = "description", required = true) String description,
            @RequestParam(value = "words", required = true) List<RestWord> words)

正如您所看到的，参数words是RestWord的列表，其定义如下：

public class RestWord {
    private long id = -1;
    private String name;
    private long type = -1;
    

此外，我还定义了如下转换器：

public class RestWordConverter implements Converter<String, RestWord>{
    private static final Logger log = LoggerFactory
            .getLogger(RestWordConverter.class);
                    
    @Override
    public RestWord convert(String text) {
        // TODO Auto-generated method stub
        log.info(text);
        return new RestWord();
    }

}

就您所能看到的而言，没有太多的逻辑，也得到了在mvc上下文中注册的转换器，就像这样。

<mvc:annotation-driven conversion-service="conversionService" />

<beans:bean id="conversionService" class="org.springframework.format.support.FormattingConversionServiceFactoryBean" >
        <beans:property name="converters">
            <beans:list>
                <beans:bean class="co.com.lineascontrol.core.endpoints.converters.RestWordConverter"/>
            </beans:list>
        </beans:property>
    </beans:bean>  

String words = "[{\"id\":0,\"name\":instalar,\"type\":-1},{\"id\":0,\"name\":ventilacion,\"type\":-1},{\"id\":0,\"name\":tunel,\"type\":-1}]";

c.c.l.c.e.c.RestWordConverter - [{"id":0
c.c.l.c.e.c.RestWordConverter - "name":instalar
c.c.l.c.e.c.RestWordConverter - "type":-1}
c.c.l.c.e.c.RestWordConverter - {"id":0
c.c.l.c.e.c.RestWordConverter - "name":ventilacion
c.c.l.c.e.c.RestWordConverter - "type":-1}
c.c.l.c.e.c.RestWordConverter - {"id":0
c.c.l.c.e.c.RestWordConverter - "name":tunel
c.c.l.c.e.c.RestWordConverter - "type":-1}]

<beans:bean
        class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
        <beans:property name="messageConverters">
            <beans:list>
                <beans:ref bean="jsonMessageConverter" />
            </beans:list>
        </beans:property>
    </beans:bean>

    <!-- Configure bean to convert JSON to POJO and vice versa -->
    <beans:bean id="jsonMessageConverter"
        class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
    </beans:bean>

嗨，万一有人在这方面挣扎，我设法使一切都启动和运行。

首先，如果您是Rest的新手，我找到了这篇简单的文章，解释了基本的，但非常重要的东西：

http://www.drdobbs.com/web-development/restful-web-services-a-tutorial/240169069？PGNO=1

@RequestMapping(value = "/services/crud/dangers/createDanger", method = RequestMethod.POST)
    public @ResponseBody GenericServiceReturn createDanger(
            @RequestBody List<RestWord> words,
            @RequestParam(value = "postionId", required = true) Long positionId,
            @RequestParam(value = "dangerName", required = true) String dangerName,
            @RequestParam(value = "type", required = true) String type,
            @RequestParam(value = "description", required = true) String description) {

List<RestWord> restWordList = new ArrayList<RestWord>();
            
            //put some values in the list! or whatever object you are using
            
            url = "http://localhost:8080/LineasControllBussinesLayer/rest/services/crud/dangers/createDanger";
            
            //add the uri params
            Map<String, Object> requestParams = new HashMap<String, Object>();
            requestParams.put("postionId", 1l);
            requestParams.put("dangerName", dangerName);
            requestParams.put("type", DANGER_TYPE.ACTIVITIE);
            requestParams.put("description", "actividad repeligrosa");
            
            // Create the request body as a MultiValueMap
            
            System.out.println(restWordList);
            //see how the HttpEntity is created with the first parameter as the object, and the second are the header, in my case I use the headers to aunteticate
            HttpEntity<List<RestWord>> entity2 = new HttpEntity<List<RestWord>>(restWordList, headers);
            
            
            //then just call the service!!!
            System.out.println(restTemplate.postForObject(url, entity2, String.class, requestParams));

Answer 1

我建议使用@resquestbody将json映射到对象。请注意将其与@requestparam结合使用，因为它可能工作，也可能没有给定的版本，并且必须按照一定的顺序（在这种情况下，尽量避免使用@requestparam)。

看一看：Spring MVC-为什么不能使用@RequestBody和@RequestParam一起阅读，直到最后一个注释。