前台调用后台返回json的事例

来源：互联网发布：理财软件哪个好编辑：程序博客网时间：2024/05/14 04:04

前台调用代码：

var defineIdStore = new Ext.data.JsonStore({
    url : this.rootPath
      + "/busi/templateCfg_getDefineNameData.do",
    root : 'root',
    fields : [
      'defineId',
      'defineName' ]
    });

         header : '表单名称',
         width : 150,
         dataIndex : 'defineId',
         id : "defineId",
         editor : new Ext.form.ComboBox({
           typeAhead : true,
           triggerAction : 'all',
           mode : 'remote',
           editable : false,
           scope : this,
           forceSelection : true,
           id : "defineId_combo",
           hiddenName : 'defineId',// 提交到后台的input的name
           store : defineIdStore,
           valueField : 'defineId',
           displayField : 'defineName',
           allowBlank : false,
           triggerAction : 'all'
          }),
         renderer : function(value, cellmeta, record) {
          var index = defineIdStore
            .find(Ext.getCmp('defineId_combo').valueField,value);
          var record = defineIdStore.getAt(index);
          var displayText = "";
          if (record == null) {
           displayText = value;
          } else {
           displayText = record.data.defineName;//
          }
          return displayText;
         }

后台action类中方法的返回：

public String getDefineNameData() throws IOException{
  HttpRequestUtil.printParams(request);
  CriteriaExample example = new CriteriaExample();
  List<TransDefine> transDefines = transDefineService.selectByExample(example);
  StringBuffer sb = new StringBuffer();
  sb.append("{\"root\":[");
  for(int i=0;i<transDefines.size();i++){
   TransDefine define = transDefines.get(i);
   if(i==transDefines.size()-1){
    sb.append("{\"defineId\":"+define.getDefineId()+",\"defineName\":\""+define.getDefineName()+"\"}");
   }else{
    sb.append("{\"defineId\":"+define.getDefineId()+",\"defineName\":\""+define.getDefineName()+"\"},");
   }
  }
  sb.append("]}");
  System.out.println(sb.toString());
  response.setCharacterEncoding("UTF-8");
  response.setHeader("Cache-Control", "no-cache,must-revalidate");
  response.setHeader("Pragma", "no-cache");
  response.setDateHeader("Expires", 0);
  response.getWriter().print(sb.toString());
  response.getWriter().flush();
  response.getWriter().close();
  return null;
}

虽然这种方法很挫，但是解决了我的问题，希望对初学者能有帮助。

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