对前台传过来的json对象或数组进行转化

当后台需要获取前台的多个json对象或json数组时使用

1.创建转化类

<span style="font-family:Microsoft YaHei;">/** * 对象及对象数组传输类 */public class ListMapConverter {/** * 接受的json数组对象，key值必须为objArr */protected List<Map<String,Object>> objArr ;/** * 接受的为一json对象，key值必须为obj */protected Map<String,Object> obj ;public List<Map<String, Object>> getObjArr() {return objArr;}public void setObjArr(List<Map<String, Object>> objArr) {this.objArr = objArr;}public Map<String, Object> getObj() {return obj;}public void setObj(Map<String, Object> obj) {this.obj = obj;}/** * 返回得到的list对象集合 * @return */public <T> List<T> getListModel(Class<T> clz){return null == this.objArr || this.objArr.isEmpty() ? null : GsonUtil.fromJsonToList(this.objArr, clz) ;}/** * 返回得到model对象 * @return */public <T> T getModel(Class<T> clz){return null == this.obj || this.obj.isEmpty() ? null : GsonUtil.fromJsonToObject(this.obj,clz) ;}}</span>

2.json工具

<span style="font-family:Microsoft YaHei;">/** * json工具 * @description json的转换工具 */public final class GsonUtil {private static final Gson gson = new Gson() ;/** * 这里不能直接使用new TypeToken<List<T>>(){}.getType()来转换，由于在运行时会擦除对泛型的检查，所以运行期间的泛型T被擦除之后，再转换时就会出现object的现象 * (如果要使用的话，在指定泛型的时候就将类型指定完整new TypeToken<List<xxx>>(){}.getType()) * @param json * @param clz * @return */public static <T> List<T> fromJsonToList(String json,Class<T> clz){List<T> mList = new ArrayList<T>() ;JsonArray array = new JsonParser().parse(json).getAsJsonArray() ;for(final JsonElement elem:array){mList.add(GsonUtil.getGson().fromJson(elem,clz)) ;}return mList ;}public static <T> List<T> fromJsonToList(Object obj,Class<T> clz){return fromJsonToList(toJson(obj),clz) ;}public static <T> T fromJsonToObject(String json,Class<T> clz){JsonElement elem = new JsonParser().parse(json).getAsJsonObject() ;return gson.fromJson(elem,clz) ;}public static <T> T fromJsonToObject(Object obj,Class<T> clz){return fromJsonToObject(toJson(obj),clz) ;}public static String toJson(Object src){return gson.toJson(src) ;}public static Gson getGson(){return gson ;}}</span>

3.Service

<span style="font-family:Microsoft YaHei;">public CommentGoods update(ListMapConverter con) throws Exception;</span>

4.impl

<span style="font-family:Microsoft YaHei;">@Overridepublic CommentGoods insertOrder(ListMapConverter con) throws Exception {try {String id = UUIDUtil.generateKey();CommentGoods goods = con.getModel(CommentGoods.class);goods.setCreated(BaseUtil.timeToString(new Date()));goods.setId(id);commentGoodsMapper.insert(goods);saveImgs(con, goods);return goods;} catch (Exception e) {e.printStackTrace();logger.error(e.getMessage());throw new DBException(e);}}</span>

5.对List<String,Object>进行封装

<span style="font-family:Microsoft YaHei;">/** * 对List<Map<String, Object>>进行封装 * 格式：[{"id":"","content":""...,"imgList":[{"imageName",""...}]   }] * imgList：是图片附件 * @param objest * @param result */@SuppressWarnings("unchecked")public void transf(List<Map<String, Object>> objest,List<Map<String,Object>> result) {for (Map<String, Object> map : objest) {boolean istrue = false;for (Map<String, Object> r : result) {if(r.get("id").equals(map.get("goods_id"))){istrue = true;Map<String,Object> code = new HashMap<String,Object>() ;code.put("attid", map.get("attachment_id"));code.put("imageName", map.get("imageName"));code.put("imageUpdateName", map.get("imageUpdateName"));code.put("url", map.get("url"));code.put("commentId", map.get("commentId"));code.put("createDate", map.get("createDate"));((List<Map<String,Object>>)r.get("imgList")).add(code);}}if(!istrue){Map<String,Object> temp = new HashMap<String,Object>() ;List<Map<String,Object>> codeList = new ArrayList<Map<String,Object>>() ;temp.put("id", map.get("goods_id"));temp.put("content", map.get("content"));temp.put("startLevel", map.get("startLevel"));temp.put("service", map.get("service"));temp.put("stream", map.get("stream"));temp.put("conform", map.get("conform"));temp.put("userid", map.get("userid"));temp.put("goodsId", map.get("goodsId"));temp.put("created", map.get("created"));Map<String,Object> code = new HashMap<String,Object>() ;code.put("attid", map.get("attachment_id"));code.put("imageName", map.get("imageName"));code.put("imageUpdateName", map.get("imageUpdateName"));code.put("url", map.get("url"));code.put("commentId", map.get("commentId"));code.put("createDate", map.get("createDate"));codeList.add(code);temp.put("imgList", codeList);result.add(temp) ;}}}</span>

6.Controller

<span style="font-family:Microsoft YaHei;">@RequestMapping(value="/addCommentGoods",method=RequestMethod.POST)public ResultData addCommentGoods(ListMapConverter con){try {return new ResultData(commentGoodsService.insertOrder(con));} catch (Exception e) {return SchExceptionUtil.ExceptionConvertState(e);}}</span>