Java后端接收数组 或 对象

• 1.前端不做处理，

        var roleIds = new Array();
        $("input[name='uRole']:checked").each(function(index,element){
            let roleId = $(element).attr("data-roId");
            roleIds[index] = roleId;
        });
        $.ajax({
            type: "post",
            url: baseUrl + "/userManage/updateUserRole",//对应controller的URL
            async: true,
            dataType: 'json',
            data: {
                "array": roleIds
            },
            success:

后端接收：

 String[] array = req.getParameterValues("array[]");
        if (!StringUtils.isEmpty(array))
            for (String string : array) {
                System.out.println("直接获取传递的数组参数："+string);
            }
        else
            System.out.println("直接获取传递的数组参数为空");

• 2.以json字符串形式传递到Java后端

        $.ajax({
            type: "post",
            url: baseUrl + "/userManage/updateUserRole",//对应controller的URL
            async: true,
            dataType: 'json',
            contentType : "application/json",
            data: JSON.stringify(roleIds),//json对象转化为json字符串
            success: function (ret) {
                console.log(ret);
            }

后端接收：

    @RequestMapping(value = "/updateUserRole")
    @ResponseBody
    public String updateUserRole(HttpServletRequest req,@RequestBody String[] roleIdsss) {
        if (!StringUtils.isEmpty(roleIdsss))
            for (int i = 0; i < roleIdsss.length; i++) {
                String idsss = roleIdsss[i];
                System.out.println("requestBody获取传递的json数组参数：" + idsss);
            }
        else
            System.out.println("requestBody获取传递的json数组参数为空");

两种post请求的content-type不同

• 后端使用java对象接收

 前端js 传递json字符串，设置contentType:"application/json"：

        var dataObj = {
            "userName":username,
            "phone":phone,
            "id":uId
        }
        var dataJsonStr = JSON.stringify(dataObj);
        console.log(dataJsonStr);
        $.ajax({
            type:"post",
            url:baseUrl+"/userManage/updateSyeUser",//对应controller的URL
            async:true,
            contentType : "application/json",
            dataType: 'json',
            data: dataJsonStr,
            success:function(ret){
      

后台java：需要使用@requestBody 

    @RequestMapping(value = "/updateSyeUser",method = RequestMethod.POST)
    @ResponseBody
    public Map<String,Object> updateSyeUser(@RequestBody SysUser sysUser){//
 

参考链接：

https://blog.csdn.net/u012838207/article/details/80519375