使用JSON，在SERVLET或者STRUTS的ACTION中取得数据时，如果会出现异常：java.lang.NoClassDefFoundError: net/sf/ezmorph/Morpher

是因为需要的类没有找到，一般，是因为少导入了JAR包，

使用JSON时，除了要导入JSON网站上面下载的json-lib-2.2-jdk15.jar包之外，还必须有其它几个依赖包：commons-beanutils.jar，commons-httpclient.jar，commons-lang.jar，ezmorph.jar，morph-1.0.1.jar

这几个包也是需要导入的．如果缺少里面的：ezmorph.jar包，则即出现上述异常

commons系列的包，可在网站：http://www.docjar.com/上面搜索下载，其它包可下载网站如下：

http://json-lib.sourceforge.net/
http://ezmorph.sourceforge.net/
http://morph.sourceforge.net/

那么怎么从后台传数据到前台呢:

action里

JSONObject json = new JSONObject();
??json.put("result", list);
??json.put("totalCount", list.size());
??System.out.println("-------------="+json.toString());
??HttpServletResponse response = ServletActionContext.getResponse();?
??????? // 编制响应的格式??
??????? response.setContentType("text/html;charset=UTF-8");?

??
??try {
???response.getWriter().write(json.toString());
??} catch (IOException e) {
???e.printStackTrace();
??}

return null;

前台mygrid.js:

ListGridPanel=function(viewer,config){
?Ext.apply(this,viewer);
?this.init(config);
?ListGridPanel.superclass.constructor.call(this,{
?
?});
};

Ext.extend(ListGridPanel,Ext.grid.GridPanel,{
?init:function(config){??
??var col=[];
??var rcol=[];
??for(var i=0,j=config.columns;i<j.length;i++){
???
???if(j[i]["dataIndex"]!=""){
????col.push(j[i]);
???rcol.push({name:j[i]["dataIndex"]});
???}
???
??}
??this.columns=col;
??alert("我来了数据="+config.url);
??var store = new Ext.data.Store({
???url:config.url,

???baseParams:{method:config.method,limit:10,start:0},

???reader:new Ext.data.JsonReader({totalProperty: 'totalCount',root:"result"},Ext.data.Record.create(rcol)),
???autoLoad:true
??});

??
??this.store = store,
??this.region='center',
??this.loadMask=true,
??this.bbar= new Ext.PagingToolbar({store:store,pageSize:10,displayMsg:'显示第 {0} 条到 {1} 条记录，一共 {2} 条', emptyMsg:'没有记录'});
?}

});

自己的jsp:

var usercheckbox =new Ext.grid.CheckboxSelectionModel();
??var userrownumber=new Ext.grid.RowNumberer();
??var widthValue=61;
??var yoyo = "123";
??//权限表头
??var purview=[usercheckbox,userrownumber,
?????????? {header:'应用提供商编号',dataIndex:'bpid',sortable:true},
?????????? {header:'服务名称',dataIndex:'bsName',sortable:true},
?????????? {header:'密码',dataIndex:'password',sortable:true},
?????????? {header:'用系统名称',dataIndex:'userName',sortable:true}
????????????? ?];
????????????? ?
???????? var config={columns:purview,url:'<%=basePath%>/AdminLogin/login/adminLoginAction_loginQueryUserList',method:'loginQueryUserList'}; ?
?? var gridpanel=new ListGridPanel({height:500,width:1200,sm:usercheckbox,id:"grid"},config);

记得:

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
??<title>Insert title here</title>
??<script type="text/javascript"
???src="<%=basePath%>/AdminLogin/common/ext/ext-base.js"></script>
??<script type="text/javascript"
???src="<%=basePath%>/AdminLogin/common/ext/ext-all.js"></script>
??<link rel="stylesheet" type="text/css"
???href="<%=basePath%>/AdminLogin/common/ext/resources/css/ext-all.css" />
??<script type="text/javascript"
???src="<%=basePath%>/AdminLogin/common/myGrid.js"></script>
??<script type="text/javascript">