dom4j解析xml

@RequestMapping("/getGridColumn")
    public void getGridColumn(HttpServletRequest request,HttpServletResponse response,String model) throws Exception{
        //xml存在web-inf目录下
        String filePath = request.getSession().getServletContext().getRealPath("/WEB-INF")+"/columnName.xml";
        Map<String, Object> map = new HashMap<String, Object>();
        SAXReader reader = new SAXReader();
        Document doc = reader.read(new File(filePath));
        Element root = doc.getRootElement();
        Iterator<?> iters = root.elementIterator("column");
        while(iters.hasNext()){
            Element column = (Element)iters.next();
            //取得column节点的名称
            String columnName = column.attributeValue("name");
            if(columnName!=null && columnName.equals(model)){
                List<Map<String, Object>> list = new ArrayList<Map<String,Object>>();
                map.put("className", columnName);
                map.put("isMultiple", column.attributeValue("isMultiple"));
                Iterator<?> items = column.elementIterator("item");
                //设置行号
                Map<String, Object> columnNumber = new HashMap<String, Object>();
                columnNumber.put("text", "行号");
                columnNumber.put("xtype", "rownumberer");
                columnNumber.put("align", "center");
                columnNumber.put("width", 40);            
                list.add(columnNumber);
                while(items.hasNext()){
                    Element item = (Element)items.next();                
                    Map<String, Object> itemMap = new HashMap<String, Object>();
                    itemMap.put("dataIndex",item.attributeValue("name"));
                    itemMap.put("text",item.attributeValue("value"));
                    int width = 128;
                    if(item.attributeValue("width")!=null && !item.attributeValue("width").equals("")){
                        width = Integer.parseInt(item.attributeValue("width"));
                    }
                    if(item.attributeValue("hidden")!=null && !item.attributeValue("hidden").equals("")){
                        if(item.attributeValue("hidden").equals("true")){
                            itemMap.put("hidden",true);
                        }    
                    }
                    List<Map<String, Object>> renderersList = new ArrayList<Map<String,Object>>();
                    @SuppressWarnings("unchecked")
                    List<Element> renderers = item.elements("renderer");
                    if(renderers!=null && renderers.size()>0){
                        for(Element renderer : renderers){
                            Map<String, Object> rendererMap = new HashMap<String, Object>();
                            rendererMap.put("name",renderer.attributeValue("name"));
                            rendererMap.put("value",renderer.attributeValue("value"));
                            if(renderer.attributeValue("color")!=null && !renderer.attributeValue("color").equals("")){
                                rendererMap.put("color",renderer.attributeValue("color"));
                            }
                            renderersList.add(rendererMap);
                        }
                    }
                    itemMap.put("width",width);
                    itemMap.put("align","center");
                    if(renderersList.size()>0){
                        itemMap.put("renderers",renderersList);
                    }
                    list.add(itemMap);
                }
                map.put("columns", list);
                //如果找到和Model匹配的名称则跳出循环
                break;
            }
        }
        Gson gson = new Gson();
        outPrint.printSting(request, response,true, gson.toJson(map));
    }