js 对XML文件的保存与读取

一、保存(在前端用js创建xml格式)

function exportToXml(jsonStr){
    var obj = eval('('+ jsonStr + ')');
    var xmlDoc = new ActiveXObject("Microsoft.XMLDOM");
    //创建两条处理指令
    var newPI=xmlDoc.createProcessingInstruction("xml","version=\"1.0\" encoding=\"utf-8\" standalone=\"yes\"");
    xmlDoc.appendChild(newPI);
    //创建根元素
    var documentElement=xmlDoc.createElement("root");
    xmlDoc.appendChild(documentElement);
    //创建CDATA
    //var newCD=xmlDoc.createCDATASection("This is a CDATASection node");
    //xmlDoc.documentElement.appendChild(newCD);     

    var row=xmlDoc.createElement("row");  

    var task=xmlDoc.createElement("Task");
    task.setAttribute("TaskID",obj.AJGUID);
    var aj_dj_guid=xmlDoc.createElement("AJ_DJ_GUID");
    aj_dj_guid.setAttribute("name", "案件编号");
    var taskname=xmlDoc.createElement("TaskName");
    taskname.setAttribute("name", "任务名称");
    var aj_mc=xmlDoc.createElement("AJ_MC");
    aj_mc.setAttribute("name", "案件名称");
    var aj_dd=xmlDoc.createElement("AJ_DD");
    aj_dd.setAttribute("name", "案件地点");
    var sfhcwc=xmlDoc.createElement("SFHCWC");
    sfhcwc.setAttribute("name", "是否核查完成");
    var hcsj=xmlDoc.createElement("HCSJ");
    hcsj.setAttribute("name", "核查时间");
    var refpointx=xmlDoc.createElement("RefPointX");
    refpointx.setAttribute("name", "巡查地点X坐标");
    var refpointy=xmlDoc.createElement("RefPointY");
    refpointy.setAttribute("name", "巡查地点Y坐标");
    var taskdesc=xmlDoc.createElement("TaskDesc");
    taskdesc.setAttribute("name", "任务说明");
    //添加子元素
    task.appendChild(aj_dj_guid);
    task.appendChild(taskname);
    task.appendChild(aj_mc);
    task.appendChild(aj_dd);
    task.appendChild(sfhcwc);
    task.appendChild(hcsj);
    task.appendChild(refpointx);
    task.appendChild(refpointy);
    task.appendChild(taskdesc);
    //创建text节点，作为元素的内容
    var aj_dj_guidtext=xmlDoc.createTextNode('');
    var tasknametext=xmlDoc.createTextNode('');
    var aj_mctext=xmlDoc.createTextNode('');
    var aj_ddtext=xmlDoc.createTextNode('');
    var sfhcwctext=xmlDoc.createTextNode('');
    var hcsjtext=xmlDoc.createTextNode('');
    var refpointxtext=xmlDoc.createTextNode('');
    var refpointytext=xmlDoc.createTextNode('');
    var taskdesctext=xmlDoc.createTextNode('');
    //为元素赋值
    aj_dj_guid.appendChild(aj_dj_guidtext);
    taskname.appendChild(tasknametext);
    aj_mc.appendChild(aj_mctext);
    aj_dd.appendChild(aj_ddtext);
    sfhcwc.appendChild(sfhcwctext);
    hcsj.appendChild(hcsjtext);
    refpointx.appendChild(refpointxtext);
    refpointy.appendChild(refpointytext);
    taskdesc.appendChild(taskdesctext);
    row.appendChild(task);//添加到row元素中

    var project=xmlDoc.createElement("Project");
    var aj_dj_guid_project=xmlDoc.createElement("AJ_DJ_GUID");
    var xzqdm=xmlDoc.createElement("XZQDM");
    var ajmc=xmlDoc.createElement("AJMC");
    var bz=xmlDoc.createElement("BZ");
    //添加子元素
    project.appendChild(aj_dj_guid_project);
    project.appendChild(xzqdm);
    project.appendChild(ajmc);
    project.appendChild(bz);
    //创建text节点，作为元素的内容
    var aj_dj_guid_projecttext=xmlDoc.createTextNode(obj.AJGUID);
    var xzqdmtext=xmlDoc.createTextNode('');
    var ajmctext=xmlDoc.createTextNode(obj.DKMC);
    var bztext=xmlDoc.createTextNode('');
    //为元素赋值
    aj_dj_guid_project.appendChild(aj_dj_guid_projecttext);
    xzqdm.appendChild(xzqdmtext);
    ajmc.appendChild(ajmctext);
    bz.appendChild(bztext); 

    var ajdks=xmlDoc.createElement("AJDKS");
    ajdks.setAttribute("count", "1");
    var ajdk=xmlDoc.createElement("AJDK");
    var attribute=xmlDoc.createElement("Attribute");
    var dkbh=xmlDoc.createElement("DKBH");
    var dkmc=xmlDoc.createElement("DKMC");
    var tdyt=xmlDoc.createElement("TDYT");
    var dkmj=xmlDoc.createElement("DKMJ");
    //添加子元素
    attribute.appendChild(dkbh);
    attribute.appendChild(dkmc);
    attribute.appendChild(tdyt);
    attribute.appendChild(dkmj);
    //创建text节点，作为元素的内容
    var dkbhtext=xmlDoc.createTextNode('');
    var dkmctext=xmlDoc.createTextNode(obj.DKMC);
    var tdyttext=xmlDoc.createTextNode('');
    var dkmjtext=xmlDoc.createTextNode('');
    //为元素赋值
    dkbh.appendChild(dkbhtext);
    dkmc.appendChild(dkmctext);
    tdyt.appendChild(tdyttext);
    dkmj.appendChild(dkmjtext);
    ajdk.appendChild(attribute);//添加到ajdk元素中

    var shape=xmlDoc.createElement("Shape");
    for(i=0;i<obj.PointNumber;i++){
     var point=xmlDoc.createElement("Point");
     point.setAttribute("NO", ""+(i+1)+"");
     point.setAttribute("X", ""+obj.SHAPE[i].X+"");
     point.setAttribute("Y", ""+obj.SHAPE[i].Y+"");
     //添加子元素
     shape.appendChild(point);
    }

    ajdk.appendChild(shape);//添加到ajdk元素中

    var appendix=xmlDoc.createElement("Appendix");
    ajdk.appendChild(appendix);//添加到ajdk元素中
    var appendixtext=xmlDoc.createTextNode('')
    appendix.appendChild(appendixtext);      

    ajdks.appendChild(ajdk);//添加到ajdks元素中
    project.appendChild(ajdks);//添加到project元素中
    row.appendChild(project);//添加到row元素中

    xmlDoc.documentElement.appendChild(row);
    //alert(xmlDoc.xml);
    xmlDoc.save("D:\\"+obj.DKMC+".xml");
    alert("保存到【D:\\"+obj.DKMC+".xml】成功！");
}

二、保存（在后台组成xml格式字符串传到前端）

1、后台flex代码

    private function expertCMJFYWXML():void{
                var ajmc:String = this.ajmctxt.text;
                if(ajmc == "请先填写案件名称"){
                    ajmc = "临时案件";
                }
                var pointNunber:int = 0;
                var points:Array = null;
                var pnt:MapPoint = null;
                var guid:String = UIDUtil.createUID();
                var resultXml = "<?xml version='1.0' encoding='utf-8' standalone='yes'?><root><row>" +
                    "<Task TaskID='"+guid+"'><AJ_DJ_GUID name='案件编号'></AJ_DJ_GUID><TaskName name='任务名称'></TaskName>" +
                    "<AJ_MC name='案件名称'></AJ_MC><AJ_DD name='案件地点'></AJ_DD><SFHCWC name='是否核查完成'></SFHCWC><HCSJ name='核查时间'></HCSJ>" +
                    "<RefPointX name='巡查地点X坐标'></RefPointX><RefPointY name='巡查地点Y坐标'></RefPointY><TaskDesc name='任务说明'>" +
                    "</TaskDesc></Task><Project><AJ_DJ_GUID>"+guid+"</AJ_DJ_GUID><XZQDM></XZQDM><AJMC>"+ajmc+"</AJMC><BZ></BZ>" +
                    "<AJDKS count='1'><AJDK><Attribute><DKBH></DKBH><DKMC>"+ajmc+"</DKMC><TDYT></TDYT><DKMJ></DKMJ></Attribute><Shape>";
                if(this._arrPoints != null && _arrPoints.length>0){
                    for(var i:int = 0; i<_arrPoints.length;i++){
                        points = _arrPoints[i];
                        if(points!=null && points.length>0){
                            for (var j:int=0; j<points.length-1; j++){
                                pointNunber = j+1;
                                pnt = MapPoint(points[j]);
                                resultXml += "<Point NO='"+pointNunber+"' X='"+pnt.y.toFixed(4)+"' Y='"+pnt.x.toFixed(4)+"'/>";
                            }
                        }
                    }
                }
                resultXml +="</Shape><Appendix></Appendix></AJDK></AJDKS></Project></row></root>";
                if(pointNunber >= 3){//是面状图形
                    callJsToExportXML(resultXml);
                }
            }

public static function callJsToExportXML(rsXml:String):void {
                var f:String = "exportToXml";
                var rs:String = ExternalInterface.call(f,rsXml);
                if (rs == "fail"){
                    //    promptMessage("导出Excel失败！",this);
                }
            }

2.1、前端代码（直接保存到本地）

function exportToXml(resultXml){
    var xmlDoc = new ActiveXObject("Microsoft.XMLDOM");
    xmlDoc.loadXML(resultXml);
    var ajmc = xmlDoc.getElementsByTagName("AJMC")[0].childNodes[0].text;
    xmlDoc.save("D:\\"+ajmc+".xml");
    alert("保存到【D:\\"+ajmc+".xml】成功！");
}

2.2弹窗选择保存路径

function exportToXml(resultXml){
    try {
        var Message = "\u8bf7\u9009\u62e9\u6587\u4ef6\u5939"; //选择框提示信息
        var Shell = new ActiveXObject("Shell.Application");
        var Folder = Shell.BrowseForFolder(0, Message, 64, 17); //起始目录为：我的电脑
        //var Folder = Shell.BrowseForFolder(0, Message, 0); //起始目录为：桌面
        if (Folder != null) {
            Folder = Folder.items(); // 返回 FolderItems 对象
            Folder = Folder.item(); // 返回 Folderitem 对象
            Folder = Folder.Path; // 返回路径
            if (Folder.charAt(Folder.length - 1) != "\\") {
                Folder = Folder + "\\";
            }
            if(Folder != "" && Folder != "undefined"){
                var xmlDoc = new ActiveXObject("Microsoft.XMLDOM");
                xmlDoc.loadXML(resultXml);
                var ajmc = xmlDoc.getElementsByTagName("AJMC")[0].childNodes[0].text;
                var filepath = Folder+ajmc+".xml";
                var fso=new ActiveXObject("Scripting.FileSystemObject");
                if(fso.FileExists(filepath)){
                    if(confirm('文件已存在，要替换吗？')){//选择是
                         xmlDoc.save(filepath);
                    }
                }else{
                    xmlDoc.save(filepath);
                }

            }
        }
    }
    catch (e) {
        alert(e.message);
    }
}

三、读取

function importXmlCoord(filePath){
    try{
        if(window.ActiveXObject) {
        var xmlDoc=new ActiveXObject("Microsoft.XMLDOM");
        xmlDoc.async="false"
        xmlDoc.load(filePath);
        var points = xmlDoc.documentElement.getElementsByTagName("Point");
        var coordStr = "1,"+points.length+",";//只有一个圈（不含多圈地）
        for(i=0;i<points.length;i++){
            var no=points[i].getAttribute("NO");
            var x=points[i].getAttribute("X");
            var y=points[i].getAttribute("Y");
            var tempI = y.indexOf(".");
            var tempY = "";
            if (tempI > 0){
                tempY = y.substring(0,tempI);  //y坐标整数位
            }else{
                tempY = yCoords;
            }
            if(isDegreeZone == "0"){
                if (tempY.length == 8){  //y坐标整数位为8，则去掉带号2位
                    tempY = yCoords.substring(2,y.length);
                }else{
                    tempY = y;
                }
            }else{
                tempY = y;
            }
            coordStr += no+","+x+","+y+",";
        }
        coordStr += "0,0,0,1,";
        return coordStr;
      }
    }catch(e){
        alert("导入XML格式坐标失败，请检查格式是否正确。");
    }
}