如何在spring MVC url映射中爲數組參數提供默認值？

Question

@RequestMapping(value = "/getUserScoreCardDetails", method = RequestMethod.GET) 
public @ResponseBody List<ScoreDetails> getUserScoreCardDetails(
@RequestParam(value = "playerIds", required = false) int[] playerIds) { 

} 

如果playerIds在請求中不可用，我需要爲playerIds提供默認值[1,2,3]？

Answer 1

裏面你的方法，只是檢查，如果playerIds是null如果是null那麼指定這樣

@RequestMapping(value = "/getUserScoreCardDetails", method = 
RequestMethod.GET) 

public @ResponseBody List<ScoreDetails> getUserScoreCardDetails(
@RequestParam(value = "playerIds", required = false) int[] playerIds) { 
    if(playerIds==null){ 
     playerIds = {1,2,3}; 
    } 
} 

Answer 2

可以在@RequestParam

設置默認值屬性裏面逗號分隔值的缺省值

@RequestMapping(value = "/getUserScoreCardDetails", method = RequestMethod.GET) 
public @ResponseBody List<ScoreDetails> getUserScoreCardDetails(
@RequestParam(value = "playerIds", required = false, defaultValue="1,2,3") int[] playerIds) { 

}