Use javascript to delete or empty all selected operations

 
function deleteAll() { 
var all = document.getElementsByName("checkname");//Getting what you selected is an array
if (all == null || all.length == 1) { 
alert(" No orders "); 
return; 
} else { 
var idStr = "";//Defines a string of ids that you want to delete
for ( var i = 0; i < all.length; i++) { 
if (all[i].checked) { 
idStr += all[i].value + ",";//Connect the ids with commas, separating them
} 
} 
var result = confirm(" Delete selected "); 
if (result) { 
window.location.href = "deleteOrderAction?action=deleteAll&idStr=" 
+ idStr; 
} else { 
return null; 
} 
} 
} 
</script> 

Finally, business processing

 
String[] arr = idStr.split(",");//An array of obtained id strings is split for each id using a comma
for (String str : arr) { 
int orderid = Integer.parseInt(str); 
OrderService.deleteOrder(orderid); 
} 

Summary: the operation of all delete and empty is the process of string splicing and splitting.