JQuery Ajax how to pass an array type parameter

Suppose the parameters that need to be passed to the background are:

var userid = [1,2,3];

var username=["a","b","c"];

Var school = "Hahahahahaha";

There are two simple methods:

1. Join Traditional to prevent depth serialization

JS code:


$.ajax({
    url:"*****",
    data:{
        "userid":userid,
        "username":username,
        "school":school
    },
    dataType:"json",
    type:"post",
    Traditional: true, / / Prevent depth serialization
    cache:false,
    async:false,
    success:function(){
        ....
    }
});

Java code:

@requesMapping(value="/****", method=RequestMethod.POST)
@responseBody
public String testForAjax(
                @RequestParam(value="userid") Integer[] userid, 
                @RequestParam(value="username") String[] username,
                String school){
  
      .....
 
}

2. Specify the parameter type

JS code:

$.ajax({
    url:"*****",
    data:{
        "userid":userid,
        "username":username,
        "school":school
    },
    dataType:"json",
    type:"post",
    cache:false,
    async:false,
    success:function(){
        ....
    }
});

Java code:

@requesMapping(value="/****", method=RequestMethod.POST)
@responseBody
public String testForAjax(
                   @RequestParam(value="userid[]") Integer[] userid,
                   @RequestParam(value="username[]") String[] username,
                   String school){
 
    .....
 
}

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