springmvc后台接前端的参数，数组，集合，复杂对象等

参考地址：https://blog.csdn.net/feicongcong/article/details/54705933

常用的几种方式如下：

（1）数组：

后台

@ResponseBody
    @RequestMapping(value = "/ajaxsortPriority")
    public ResultDo ajaxsortPriority(@RequestParam("ids[]") Long[] ids) {
        ResultDo resultDo=new ResultDo();
        int size=cmsBannerService.sortPriority(ids);
        if(size==ids.length){
            resultDo.setSuccess(true);
        }else{
            resultDo.setSuccess(false);
        }
        return resultDo;
    }

前端

var param=[];
                    $("#tb_order").find("td[name=‘id‘]").each(function(){
                        param.push($(this).text());
                    })
                    var ids={ids:param};
                    $.ajax({
                        cache: true,
                        type: "GET",
                        url: "/cmsBanner/ajaxsortPriority",
                        dataType:"json",
                        data:ids,
                        async: false,
                        success: function (data) {

（2）集合

后台

@RequestMapping(value = "/cfgRepayRemind", method = RequestMethod.POST)
    @ResponseBody
    public ResultDo<?> cfgRepayRemind(
            @RequestBody List<SysDictPojo> sysDictPojos  //@RequestBody 前台请求的数据格式必须为json

    ) {
        ResultDo<?> resultDo = ResultDo.build();
        try {
            icProjectRepayService.cfgRepayRemind(sysDictPojos);
        } catch (Exception e) {
            resultDo.setSuccess(false);
        }

        return resultDo;
    }

//pojo类public class SysDictPojo extends AbstractBasePojo {
    private Long          id;
    private String        key;
    private String        value;
    private String        description;

}

前端

function cfgRepayRemind(ele) {
            var url = $(ele).attr("value");
            var params = [];
            $("#repayRemindMobile").find("ul").each(function () {
                var id = $(this).find("input[name=‘id‘]").eq(0).val();
                var value = $(this).find("input[name=‘value‘]").eq(0).val();

                params.push({id: id, value: value});//id,value 为java bean里的属性，名字一致
            })

            $.ajax({
                cache: true,
                type: "POST",
                url: url,
                data: JSON.stringify(params),// 指定请求的数据格式为json，实际上传的是json字符串
                contentType: ‘application/json;charset=utf-8‘,//指定请求的数据格式为json,这样后台才能用@RequestBody 接受java bean
                dataType: "json",
                async: false,
                success: function (data) {
                    if (data.success) {
                        toastr.success("操作成功");
                        setTimeout(function () {
                            location.reload();
                        }, 1000)
                    }
                }
            });
        }

（3） 单参数

前端

$.ajax({
            type:"post",
        data:{total:‘100‘},
            dataType:‘json‘,

            url:"http://127.0.0.1:8089/icProject/test",
            success:function () {

            }
        })

后台

@RequestMapping(value = "/test", method = RequestMethod.POST)
    @ResponseBody
    public String test(@RequestParam("total") String total
    ) {
        return null;
    }

（3）传多个参数

前端

var tagIds = []
$.ajax({
                type: "POST",
                url: "/auth/childComment/createComment",
                data: {
                    id: $("#sourceId").val(),
                    courseId: $("#courseId").val(),
                    classId: $("#commentClassId").val(),
                    content: $("#updateContent").val(),
                    childId: $("#childId").val(),
                    classCatalogId: $("#classCatalogId").val(),
                    tagId: tagIds
                },

后台

@PostMapping("createComment")
   @PreAuthorize("hasAnyAuthority(‘merchant:childComment:index‘)")
    @ResponseBody
   public ResultDo createComment(
            @RequestParam(value = "childId") Long childId,
            @RequestParam(value = "courseId") Long courseId,
            @RequestParam(value = "classId") Long classId,
            @RequestParam(value = "classScheduleId") Long classScheduleId,
            @RequestParam(value = "content") String content,
            @RequestParam(value = "tagId[]", required = false) List<Long> tagIds
    ) {

（4）表单数据序列化传参，ajax提交

前端

var params = $("#sysUserFrm").serialize();
            var url = "/sysUser/settingSave"
            $.ajax({
                cache: true,
                type: "POST",
                url: url,
                data: params,
                dataType: "json",
                async: false,
                success: function (data) {}
            })

后台

@RequestMapping(value = "/settingSave", method = RequestMethod.POST)
    @ResponseBody
    public ResultDo<?> settingSave(SysUserPojo sysUserPojo) {}

这样sysUserPojo也能接收到Bean,其实这里的$("#sysUserFrm").serialize()  就相当于组装的  json对象 { }

使用时必须先组装json对象{username:"carter" }

我的习惯是用 @RequestBody接受带List对象的对象或者List对象，因为js中有个push方法用来组合得到 List 比较简单

不使用contentType: “application/json”则data可以是对象,使用contentType: “application/json”则data只能是json字符串

使用@RequestBody(实际上接受的是json的字符串)

function logined() {
                $.ajax({
                    type: "POST",
                    url: "/backend/logined",
                    data:JSON.stringify({userName:"cater",password:"123456"}) ,//转成字符串
                    contentType: "application/json;charset=utf-8",//不使用contentType: “application/json”则data可以是对象,使用contentType: “application/json”则data只能是json字符串
                    success: function (data) {}
                })
            }

原文地址：https://www.cnblogs.com/zhaoyanhaoBlog/p/9357027.html