后台获取json格式数据。
直接上代码。 最后有一张官方ajax获取tree的说明。

var ajaxTreeSample = function() {

        $("#tree_4").jstree({
            "core" : {
                "themes" : {
                    "responsive": false
                },// so that create works
                "check_callback" : true,'data' : function (obj,callback) {
                    var jsonstr="[]";
                    var jsonarray = eval('('+jsonstr+')');
                    $.ajax({
                        type: "POST",url:"/bms/wechat/wemenu/show.do",dataType:"json",async: false,success:function(result) {
                            var arrays= result.data;
                            for(var i=0 ; i<arrays.length; i++){
                                var arr = {
                                        "id":arrays[i].menuId,"parent":arrays[i].parentId=="root"?"#":arrays[i].parentId,"text":arrays[i].menuName
                                }
                                jsonarray.push(arr);
                            }
                        }

                    });
                    callback.call(this,jsonarray);
                }
            },"types" : {
                "default" : {
                    "icon" : "fa fa-folder icon-state-warning icon-lg"
                },"file" : {
                    "icon" : "fa fa-file icon-state-warning icon-lg"
                }
            },"state" : { "key" : "demo3" },"plugins" : [ "dnd","state","types" ]
        });

    }