Details and solutions to the problem of passing array requests in SpringMVC

When using SpringMVC, we want to pass array reference types. SpringMVC has some restrictions on array passing:

After testing: SpringMVC supports parameter passing for one-dimensional arrays, but does not support parameter passing for multi-dimensional arrays. If you want to To pass a multi-dimensional array, we have to use other methods such as: 1. Split the multi-dimensional array into a one-dimensional array; 2. Change the multi-dimensional array to a set and pass it; 3. Or change it to a string, process it during the reception time, etc., 4 , or concatenate and transfer the values ​​in all arrays (for example: data=1&data=2&data=3, representing the values ​​​​of three arrays) The method is very flexible.

1 SpringMVC passes one-dimensional array: When passing array type, you need to add value in @requestParam(), otherwise HTTP Status 400 - Required long[] parameter 'data' is not present error will occur.

For example: @RequestParam(value = "data[]")long[] data

Front-end request:

var dataArr = new Array();  
        for(var i = 0; i < 10; i++){  
            dataArr.push(i);  
        }  
        $.ajax({  
                url : "test/arrayParam.shtml",  
                data : {  
                    "datas" : dataArr  
                },  
                dataType : "json",  
                success : function(data) {  
                    alert(data);  
                },  
                async : false  
            });  
        }

Backend code:

##

package com.pyc.search.view.controller;  
  
import org.springframework.stereotype.Controller;  
import org.springframework.web.bind.annotation.RequestMapping;  
import org.springframework.web.bind.annotation.RequestParam;  
import org.springframework.web.bind.annotation.ResponseBody;  
  
/** 
 * 创建时间：2014-12-24 上午11:52:00 
 *  
 * @author zhangtianyou 
 */  
@Controller  
@RequestMapping("/test")  
public class TestController {  
  
    @RequestMapping("/arrayParam")  
    public @ResponseBody  
    int test1(@RequestParam(value = "datas[]") long[] datas) {  
  
        return datas.length;  
    }  
}

#2 Multidimensional arrays can be converted into dimensional array, or converted to a string, which is processed when received by the backend.

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