生活随笔
收集整理的這篇文章主要介紹了
总结的一些json格式和对象/String/Map/List等的互转工具类
小編覺得挺不錯的,現在分享給大家,幫大家做個參考.
?總結的一些json格式和對象/String/Map/List等的互轉工具類，有需要的可以看看,需要引入jackson-core-asl-1.7.1.jar、jackson-jaxrs-1.7.1.jar、jackson-mapper-asl-1.7.1.jar這三個jar包
package?com.zuidaima.util.json;??import?java.io.InputStream;??import?java.io.OutputStream;??import?java.io.Reader;??import?java.io.Writer;??import?java.net.URL;??import?java.util.ArrayList;??import?java.util.Date;??import?java.util.HashMap;??import?java.util.List;??import?java.util.Map;????import?org.codehaus.jackson.JsonNode;??import?org.codehaus.jackson.map.DeserializationConfig;??import?org.codehaus.jackson.map.ObjectMapper;??import?org.codehaus.jackson.map.annotate.JsonSerialize;??import?org.codehaus.jackson.map.type.TypeFactory;????public?class?JsonUtil?{????????private?static?ObjectMapper?mapper?=?new?ObjectMapper();??????static{????????????????????mapper.getDeserializationConfig().set(DeserializationConfig.Feature.FAIL_ON_UNKNOWN_PROPERTIES,?false);????????????????????????????mapper.getSerializationConfig().setSerializationInclusion(JsonSerialize.Inclusion.NON_NULL);??????????????????mapper.getSerializationConfig().setSerializationInclusion(JsonSerialize.Inclusion.NON_DEFAULT);??????}??????????public?static?boolean?isJSON(String?jsonString)?{??????????return?mapper.canSerialize(HashMap.class);??????}????????public?static?<V>?Map<String,?V>?toMap(String?content,Class<??extends?V>?clazz)?throws?Exception?{??????????return?mapper.readValue(content,?TypeFactory.mapType(HashMap.class,String.class,?clazz));??????}????????public?static?<V>?Map<String,?V>?toMap(InputStream?is,Class<??extends?V>?clazz)?throws?Exception?{??????????return?mapper.readValue(is,?TypeFactory.mapType(HashMap.class,String.class,?clazz));??????}????????public?static?<V>?Map<String,?V>?toMap(Reader?is,?Class<??extends?V>?clazz)throws?Exception?{??????????return?mapper.readValue(is,?TypeFactory.mapType(HashMap.class,String.class,?clazz));??????}????????public?static?<V>?Map<String,?V>?toMap(URL?is,?Class<??extends?V>?clazz)throws?Exception?{??????????return?mapper.readValue(is,?TypeFactory.mapType(HashMap.class,String.class,?clazz));??????}??????????public?static?<E>?List<E>?toList(String?content,?Class<??extends?E>?clazz)throws?Exception?{??????????return?jsonToList(content,?clazz);??????}????????????????public?static?<E>?List<E>?jsonToList(String?content,Class<??extends?E>?clazz)?throws?Exception?{??????????return?mapper.readValue(content,?TypeFactory.collectionType(ArrayList.class,?clazz));??????}??????????public?static?Integer[]?jsonToIntArray(String?content)?throws?Exception?{??????????return?jsonToArray(content,?Integer.class);??????}????????public?static?Integer[]?jsonToIntArray(String?content,String?key)?throws?Exception?{??????????return?jsonToArray(content,?key,?Integer.class);??????}??????????public?static?<E>?E[]?jsonToArray(String?content,?Class<??extends?E>?clazz)throws?Exception?{??????????if(content?!=?null){??????????????return?mapper.readValue(content,?TypeFactory.arrayType(clazz));??????????}else{??????????????return?null;??????????}??????}????????????public?static?<T>?T?fromJsonToObject(String?content,Class<??extends?T>?clazz)?throws?Exception?{??????????return?jsonToObject(content,?clazz);??????}????????public?static?<T>?T?jsonToObject(String?content,?Class<??extends?T>?clazz)throws?Exception?{??????????return?mapper.readValue(content,?clazz);??????}????????????public?static?<T>?T?jsonToObject(String?content,?String?key,Class<??extends?T>?clazz)?throws?Exception?{??????????JsonNode?rootNode?=?mapper.readValue(content,?JsonNode.class);??????????JsonNode?path?=?rootNode.path(key);??????????if(!path.isMissingNode()){??????????????return?jsonToObject(path.toString(),?clazz);??????????}else{??????????????return?null;??????????}??????}????????????public?static?Integer?getInt(String?content,?String?key)?throws?Exception?{??????????JsonNode?rootNode?=?mapper.readValue(content,?JsonNode.class);??????????JsonNode?path?=?rootNode.path(key);??????????if(!path.isMissingNode()){??????????????return?jsonToObject(path.toString(),?Integer.class);??????????}else{??????????????return?null;??????????}??????}????????????public?static?String?getString(String?content,?String?key)?throws?Exception?{??????????JsonNode?rootNode?=?mapper.readValue(content,?JsonNode.class);??????????JsonNode?path?=?rootNode.path(key);??????????if(!path.isMissingNode()){??????????????return?jsonToObject(rootNode.path(key).toString(),?String.class);??????????}else{??????????????return?null;??????????}??????}????????????public?static?Date?getDate(String?content,?String?key)?throws?Exception?{??????????JsonNode?rootNode?=?mapper.readValue(content,?JsonNode.class);??????????JsonNode?path?=?rootNode.path(key);??????????if(!path.isMissingNode()){??????????????return?jsonToObject(path.toString(),?Date.class);??????????}else{??????????????return?null;??????????}??????}????????????public?static?<E>?E[]?jsonToArray(String?content,?String?key,Class<??extends?E>?clazz)?throws?Exception?{??????????JsonNode?rootNode?=?mapper.readValue(content,?JsonNode.class);??????????JsonNode?path?=?rootNode.path(key);??????????if(!path.isMissingNode()){??????????????return?jsonToArray(rootNode.path(key).toString(),?clazz);??????????}else{??????????????return?null;??????????}??????}????????????public?static?Integer[]?jsonToArray(String?content,?String?key)?throws?Exception?{??????????JsonNode?rootNode?=?mapper.readValue(content,?JsonNode.class);??????????JsonNode?path?=?rootNode.path(key);??????????if(!path.isMissingNode()){??????????????return?jsonToArray(path.toString(),?Integer.class);??????????}else{??????????????return?null;??????????}??????}????????????public?static?<E>?List<E>?jsonToList(String?content,?String?key,Class<??extends?E>?clazz)?throws?Exception?{??????????JsonNode?rootNode?=?mapper.readValue(content,?JsonNode.class);??????????JsonNode?path?=?rootNode.path(key);??????????if(!path.isMissingNode()){??????????????return?toList(path.toString(),?clazz);??????????}else{??????????????return?null;??????????}??????}????????????public?static?String?toJson(Object?o)?throws?Exception?{??????????return?mapper.writeValueAsString(o);??????}????????????public?static?void?toJson(OutputStream?out,?Object?o)?throws?Exception?{??????????mapper.writeValue(out,?o);??????}????????????public?static?void?toJson(Writer?out,?Object?o)?throws?Exception?{??????????mapper.writeValue(out,?o);??????}????????????public?static?String?map2Json(Map?map)?throws?Exception{??????????return?toJson(map);??????}??????????public?static?String?formatJson(String?json,?String?fillStringUnit)?{???????????if?(json?==?null?||?json.trim().length()?==?0)?{???????????????return?null;???????????}??????????????????????int?fixedLenth?=?0;???????????ArrayList<String>?tokenList?=?new?ArrayList<String>();???????????{???????????????String?jsonTemp?=?json;???????????????????????????while?(jsonTemp.length()?>?0)?{???????????????????String?token?=?getToken(jsonTemp);???????????????????jsonTemp?=?jsonTemp.substring(token.length());???????????????????token?=?token.trim();???????????????????tokenList.add(token);???????????????}??????????????????????}??????????????????????for?(int?i?=?0;?i?<?tokenList.size();?i++)?{???????????????String?token?=?tokenList.get(i);???????????????int?length?=?token.getBytes().length;???????????????if?(length?>?fixedLenth?&&?i?<?tokenList.size()?-?1?&&?tokenList.get(i?+?1).equals(":"))?{???????????????????fixedLenth?=?length;???????????????}???????????}??????????????????????StringBuilder?buf?=?new?StringBuilder();???????????int?count?=?0;???????????for?(int?i?=?0;?i?<?tokenList.size();?i++)?{??????????????????????????????String?token?=?tokenList.get(i);??????????????????????????????if?(token.equals(","))?{???????????????????buf.append(token);???????????????????doFill(buf,?count,?fillStringUnit);???????????????????continue;???????????????}???????????????if?(token.equals(":"))?{???????????????????buf.append("?").append(token).append("?");???????????????????continue;???????????????}???????????????if?(token.equals("{"))?{???????????????????String?nextToken?=?tokenList.get(i?+?1);???????????????????if?(nextToken.equals("}"))?{???????????????????????i++;???????????????????????buf.append("{?}");???????????????????}?else?{???????????????????????count++;???????????????????????buf.append(token);???????????????????????doFill(buf,?count,?fillStringUnit);???????????????????}???????????????????continue;???????????????}???????????????if?(token.equals("}"))?{???????????????????count--;???????????????????doFill(buf,?count,?fillStringUnit);???????????????????buf.append(token);???????????????????continue;???????????????}???????????????if?(token.equals("["))?{???????????????????String?nextToken?=?tokenList.get(i?+?1);???????????????????if?(nextToken.equals("]"))?{???????????????????????i++;???????????????????????buf.append("[?]");???????????????????}?else?{???????????????????????count++;???????????????????????buf.append(token);???????????????????????doFill(buf,?count,?fillStringUnit);???????????????????}???????????????????continue;???????????????}???????????????if?(token.equals("]"))?{???????????????????count--;???????????????????doFill(buf,?count,?fillStringUnit);???????????????????buf.append(token);???????????????????continue;???????????????}??????????????????????????????buf.append(token);???????????????????????????if?(i?<?tokenList.size()?-?1?&&?tokenList.get(i?+?1).equals(":"))?{???????????????????int?fillLength?=?fixedLenth?-?token.getBytes().length;???????????????????if?(fillLength?>?0)?{???????????????????????for(int?j?=?0;?j?<?fillLength;?j++)?{???????????????????????????buf.append("?");???????????????????????}???????????????????}???????????????}???????????}???????????return?buf.toString();???????}??????????????private?static?String?getToken(String?json)?{???????????StringBuilder?buf?=?new?StringBuilder();???????????boolean?isInYinHao?=?false;???????????while?(json.length()?>?0)?{???????????????String?token?=?json.substring(0,?1);???????????????json?=?json.substring(1);??????????????????????????????if?(!isInYinHao?&&????????????????????????(token.equals(":")?||?token.equals("{")?||?token.equals("}")????????????????????????????????||?token.equals("[")?||?token.equals("]")???????????????????????????????||?token.equals(",")))?{???????????????????if?(buf.toString().trim().length()?==?0)?{?????????????????????????????????????????buf.append(token);???????????????????}??????????????????????????????????????break;???????????????}??????????????????if?(token.equals("\\"))?{???????????????????buf.append(token);???????????????????buf.append(json.substring(0,?1));???????????????????json?=?json.substring(1);???????????????????continue;???????????????}???????????????if?(token.equals("\""))?{???????????????????buf.append(token);???????????????????if?(isInYinHao)?{???????????????????????break;???????????????????}?else?{???????????????????????isInYinHao?=?true;???????????????????????continue;???????????????????}??????????????????????????????}???????????????buf.append(token);???????????}???????????return?buf.toString();???????}??????????private?static?void?doFill(StringBuilder?buf,?int?count,?String?fillStringUnit)?{???????????buf.append("\n");???????????for?(int?i?=?0;?i?<?count;?i++)?{???????????????buf.append(fillStringUnit);???????????}???????} ????} ??
引用原文：https://blog.csdn.net/springmvc_springdata/article/details/44056043
?
寫博客是為了記住自己容易忘記的東西，另外也是對自己工作的總結，文章可以轉載，無需版權。希望盡自己的努力，做到更好，大家一起努力進步！
如果有什么問題，歡迎大家一起探討，代碼如有問題，歡迎各位大神指正！
轉載于:https://www.cnblogs.com/summary-2017/p/8965074.html
總結
以上是生活随笔為你收集整理的总结的一些json格式和对象/String/Map/List等的互转工具类的全部內容，希望文章能夠幫你解決所遇到的問題。
如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。
