如何过滤从Spring rest Web服务返回的json响应 [英] How to filter the json response returning from spring rest web service

问题描述

如何过滤从Spring rest Web服务返回的json响应。

How to filter the json response returning from spring rest web service.

当使用调用customEvents时，我只需要输出eventId和Event名称。当询问特定事件时，我需要
发送事件的完整细节。

When use call the customEvents i only need to outout the eventId and the Event name only. When Ask for specifc event i need to send the full details of the event.

Class CustomEvent{

 long id;
 String eventName;
 Account createdBy;
 Account modifiedBy;
 ..


}

Class Account{
 long id;
 String fname;
 String lname;
 ....

}


@Controller
public class CustomEventService
{
    @RequestMapping("/customEvents")
    public @ResponseBody List<CustomEvent> getCustomEventSummaries() {}

    @RequestMapping("/customEvents/{eventId}")
    public @ResponseBody CustomEvent getCustomEvent(@PathVariable("eventId") Long eventId) {}
}

我如何实现上述目标？我现在正在使用spring 3.1。 3.1版本中是否支持以上或以后的版本

how can i achieve the above? I'm using spring 3.1 at the moment. Is ther any support in 3.1 version to achieve above or later verion

推荐答案

您可以使用@JsonFilter进行存档。

You can use @JsonFilter to archive.

Pojo：

@JsonFilter("myFilter")
public class User {
    ....
}

控制器：

public String getUser(
            @RequestParam(value="id") String id, 
            @RequestParam(value="requiredFields",required=false ) String requiredFields
        ) throws JsonParseException, JsonMappingException, IOException {

    //Get User 
    User user = userService.getUser(id);
    //Start
    ObjectMapper mapper = new ObjectMapper();
    // and then serialize using that filter provider:
    String json="";
    try {
        if (requiredFields!= null) {
            String[] fields = requiredFields.split("\\,");

            FilterProvider filters = new SimpleFilterProvider().addFilter("myFilter",
            SimpleBeanPropertyFilter.filterOutAllExcept(new HashSet<String>(Arrays
                  .asList(fields))));

            json = mapper.filteredWriter(filters).writeValueAsString(user);//Deprecated 
        } else {
            SimpleFilterProvider fp = new SimpleFilterProvider().setFailOnUnknownId(false);
            mapper.setFilters(fp);
            json =mapper.writeValueAsString(user);
        }
    } catch (JsonGenerationException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (JsonMappingException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

    return json;
}

获取网址：.....& requiredFields = id，Name，年龄

Get URL: .....&requiredFields=id,Name,Age

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