关于Ext中Jason取数据的问题

Question

仅仅是想测试一下Jason取remote数据,使用ext的combobox组件,但出现问题,无解,请教,代码如下Ext.onReady(function(){
         var recordType2 = Ext.data.Record.create([
   {name: "code", type: "string"},
{name: "label", type: "string"}
  ]);
        var store4 = new Ext.data.Store({
         proxy: new Ext.data.HttpProxy({url:'/dwr/MyServlet'}),
         //proxy: new Ext.data.DWRProxy(Person.getAreas, false),
         reader: new Ext.data.JsonReader({
         totalProperty:'results',
         root:'areas',
         id:'area_id'}, recordType2),
         /*
         reader: new Ext.data.ListRangeReader( 
{id:'id', totalProperty:'totalSize'}, recordType),
         */
remoteSort: false
        });
        
        var combo4 = new Ext.form.ComboBox({
         store : store4,
         displayField:'label',
         valueField:'code',
         hiddenName:'street',
         typeAhead:true,
         mode:'local',
         triggerAction: 'all',
         emptyText:'全部',
         selectOnFocus:true,
         applyTo:'p_s'
        });
        combo4.store.load();
      });<input type=text id=p_s size=20 class=picklist>//MyServlet代码为
void service() {
                  req.setCharacterEncoding("GBK");
res.setContentType("text/xml; charset=GBK");
PrintWriter pw = res.getWriter();
pw.print("{'results':2, 'areas':[" +
"{'area_id':1, 'code':'HZ','lable':'HongZhen'}," +
"{'area_id':2, 'code':'SP','lable':'ShiPai'}]}");
pw.flush();
}但是web端无法显示该combobox中的下拉数据,firefox中一直提示字符串(json返回的)未组织好的信息

Answer 1

boolean scriptTag = false; 
String cb = request.getParameter("callback"); 
if (cb != null) { 
scriptTag = true; 
response.setContentType("text/javascript"); 
} else { 
response.setContentType("application/x-json"); 
} 
Writer out = response.getWriter(); 
if (scriptTag) { 
out.write(cb + "("); 
} 
out.print(dataBlock.toJsonString()); 
if (scriptTag) { 
out.write(");"); 
} 
在你的servlet端加如上代码。

Answer 2

http://topic.csdn.net/u/20090324/16/AA352D60-AA19-4458-8711-81BBA7CC8D12.html 这里可以参考

Answer 3

http://topic.csdn.net/u/20090324/16/AA352D60-AA19-4458-8711-81BBA7CC8D12.html 这里可以参考

Answer 4

res.setContentType("text/xml; charset=GBK"); 
这个去掉吧，你不是xmlreader
如果是xmlreader，就要设置为xml

Answer 5

response.setCharacterEncoding("utf-8");
response.setContentType("application/x-json");
servlet这么写应该就没问题了~··