var countsCheckBox = $("input[type='checkbox']:checked"); 
 var booksid = []; 
 for(var i=0;i<countsCheckBox.length;i++){ 
 //使用[]取得元素是是一个domElement元素，取值需要使用.value， 
 //如果使用countsCheckBox.eq(i) 则是一个Obkject元素，就可以使用val()取值 
 //alert(countsCheckBox[i].value); 
 mysendbook_id = {}; 
 mysendbook_id['book_id'] = countsCheckBox[i].value; 
 booksid[i] = mysendbook_id; 
 } 
 //alert(booksid); 
  var confirmdel= confirm('确认要删除吗?'); 
  if(confirmdel){ 
  //开始请求删除 
   $.ajax({ 
     url:'selectdelbooks', 
     data:JSON.stringify(booksid), 
     type:'post', 
     success:function(res){ 
      alert("删除成功"); 
     location.replace("/TheDemo/books/pageBooksShow"); 
     } 
     }); 
  } 

<span style="font-family:SimSun;font-size: 10.5pt;"> </span><span style="font-family:KaiTi_GB2312;font-size:14px;"> @RequestMapping("selectdelbooks") 
 public String selectdelbooks(HttpServletRequest request) throws Exception { 
  ServletInputStream inputStream = request.getInputStream(); 
  String mybooksid = IOUtils.toString(inputStream); 
  JSONArray jsonarr = new JSONArray(mybooksid); 
  List<String> book_id =new ArrayList<String>(); 
  for (int i=0;i<jsonarr.length();i++){ 
   book_id.add(((JSONObject)jsonarr.get(i)).getString("book_id")); 
  }...</span>