@RequestParam使用defaultValue屬性設置默認值的操作

Posted on by

@RequestParam使用defaultValue屬性設置默認值

註意設置必須是string類型的，框架自己會做轉換

@RequestParam(value = "page", required = false, defaultValue = "1") Integer page,
@RequestParam(value = "size", required = false) Integer size,

補充：@RequestParam註解的使用說明

自SpringMVC4.2之後，RequestParam內部有4個參數：

1、String name;

2、String value;

3、boolean required;

4、String defaultValue;

源碼中name的別名是value，value的別名是name,

所以說name和value兩個屬性基本是等價的,都是獲取從前臺傳入的參數

RequestParam來映射請求參數

required表示是否必須,默認為true

defaultValue請求參數的默認值

@RequestMapping(value = "/testRequestParam")
 public String testRequestParam(@RequestParam(value="username")String un,@RequestParam(value = "age",required = false,defaultValue = "0") int age){
  System.out.println("testRequestParam,username:"+un+",age,"+age);
  return "success";
 }

<script>
  (function(){
  function setArticleH(btnReadmore,posi){
  var winH = $(window).height();
  var articleBox = $("div.article_content");
  var artH = articleBox.height();
  if(artH > winH*posi){
  articleBox.css({
   'height':winH*posi+'px',
   'overflow':'hidden'
  })
  btnReadmore.click(function(){
   if(typeof window.localStorage === "object" && typeof window.csdn.anonymousUserLimit === "object"){
   if(!window.csdn.anonymousUserLimit.judgment()){
   window.csdn.anonymousUserLimit.Jumplogin();
   return false;
   }else if(!currentUserName){
   window.csdn.anonymousUserLimit.updata();
   }
   }
   
   articleBox.removeAttr("style");
   $(this).parent().remove();
  })
  }else{
  btnReadmore.parent().remove();
  }
  }
  var btnReadmore = $("#btn-readmore");
  if(btnReadmore.length>0){
  if(currentUserName){
  setArticleH(btnReadmore,3);
  }else{
  setArticleH(btnReadmore,1.2);
  }
  }
  })()
 </script>
 </article>

以上為個人經驗，希望能給大傢一個參考，也希望大傢多多支持WalkonNet。如有錯誤或未考慮完全的地方，望不吝賜教。

推薦閱讀：