function saveUser(){  
            $('#addForm').form('submit',{  
                url: url,  
                success: function(result){
                    alert(result);  
                    var result = eval('('+result+')');  
                    alert(result); 
                    if (result.success){  
                        $('#addDialog').dialog('close');      // close the dialog  
                        $('#test').datagrid('reload');    // reload the user data  
                    } else {  
                        $.messager.show({  
                            title: 'Error',  
                            msg: result.message  
                        });  
                    }  
                }
            });  
        }  

<action name="addRyxx" class="com.impms.action.RyxxAction" method="add">
               <result name="success" type="json" >
               </result>
       </action>

public String add() {
        int flag = RyxxImpl.addRyxx(ryxx);
        if(flag==1){
            //添加成功
            success = true;
            message = "人员信息添加成功！";
        }else{
            //添加不成功
            success = false;
            message = "人员信息添加不成功，请检查！";
        }
        Map<String, Object> jsonMap = new HashMap<String, Object>();//定义map 
        jsonMap.put("status", success);
        jsonMap.put("message", message);
        result = JSONObject.fromObject(jsonMap);//格式化result   一定要是JSONObject 
        System.out.println(result);
        return SUCCESS; 
    }