AJAX传给SpringMVC字符串与JAVA后台处理问题

在js代码中有如下ajax：

$.ajax({
    type:"POST",
    url:"/user_role/roleForOneUser",
    data:{"id":$scope.userViewInfo.id,"roleList":this.roleArray},
    contentType:"application/x-www-form-urlencoded",
    dataType:"json",
    success:function(data){
        console.log(data);
        $scope.$apply(function(){

        });
    }
});

例如：this.roleArray = "0-2-3-4-5-12-32-1-";

后台java程序接收到这个字符串后将其变换成list对象。采用如下方法：

package com.whut.work.base.util;

import java.util.ArrayList;
import java.util.List;

/**
 * Created by zouy on 2016/12/29.
 */
public class JavaStringUtil{

    private static int counter = 0;
    private static List<Integer> listInt = new ArrayList<Integer>();

    //判断字符串str含有多少个substr子字符串
    public static int stringNumbers(String str,String substr) {
        if (str.indexOf(substr) == -1) {
            return counter;
        }
        else if(str.indexOf(substr) != -1) {
            counter++;
            stringNumbers(str.substring(str.indexOf(substr)+substr.length()),substr);
        }
        return counter;
    }
    
    //将string字符串(用"-"隔开的)变成list集合
    public static List<Integer> stringToList(String str,String substr) {
        if (str.indexOf(substr) == -1) {
            return listInt;
        }
        else if(str.indexOf(substr) != -1) {
        	listInt.add(Integer.parseInt(str.substring(0, str.indexOf(substr))));
        	stringToList(str.substring(str.indexOf(substr)+substr.length()),substr);
        }
        return listInt;
    }

}

package com.whut.work.base.util;


import java.util.List;

import com.whut.work.base.util.TestString;

public class TestString {

	public static void main(String[] args) {
		String str = "0-2-3-4-5-12-32-1-";
		String substr = "-";
		List<Integer> listInt = JavaStringUtil.stringToList(str,substr);
		System.out.println(listInt);
	}

}

[0, 2, 3, 4, 5, 12, 32, 1]

证明转换成功，然后我们进行数据库操作。