SpringBoot ajax发送请求到后台接受完整例子

前端ajax写法：

function middleCategoryChange(url) {
  var middleCategory = $("select[name='middleCategory']").val();
    var json ={};
    json.middleCategory = middleCategory;
    var windowToken = $('input[name="windowToken"]').val();
    $.ajax({
      async: true,
      headers: { "X-CSRF-Token": windowToken },
        url  : url,
        type : "post", //使用post方法
        contentType: "application/json", //指定为json格式，不然后台接受会报错
        data : JSON.stringify(json),   // 用JSON.stringify转换为json对象，不然后台接受的值不对
        cache: false,
        dataType: "json"
      }).done(function(data, status, jqxhr) {
       var minorCategoryList = data[0];
       var subCategoryList = data[1];
        if (minorCategoryList) {
          $("select[name='minorCategory']").empty();
          for(var i = 0; i < minorCategoryList.length; i++) {
            $("select[name='minorCategory']").append("<option value='" + minorCategoryList[i].categoryCd + "'>" +  minorCategoryList[i].categoryNm + "</option>");
          }
        }
        if (subCategoryList) {
          $("select[name='subCategory']").empty();
          for(var i = 0; i < subCategoryList.length; i++) {
            $("select[name='subCategory']").append("<option value='" + subCategoryList[i].categoryCd + "'>" +  subCategoryList[i].categoryNm + "</option>");
          }
        }

      }).fail(function(data, status, jqxhr) {
        alert("error!");
      });


}

后台代码：

controller

@RequestMapping("minorCategory/search")
    @ResponseBody
    public List<List<CategoryEntity>> minorCategorySearch(
            @RequestBody ProductFormEntity formEntity) throws JSONException {
         // 后台接受参数时需要加上 @RequestBody注解，头部需要加上@ResponseBody注解

        List<CategoryEntity> minorCategoryList
                = categoryUtil.getMinorCategoryList(formEntity.middleCategory);

        List<CategoryEntity> subCategoryList
                = categoryUtil.getSubCategoryList(formEntity.middleCategory, null);

        List<List<CategoryEntity>> list = new ArrayList<>();
        list.add(minorCategoryList);
        list.add(subCategoryList);
        // 因为需要返回两个List,所以返回的是list的list
        return list;
    }

formEntity

public String middleCategory;

public String minorCategory;

public String subCategory;