Summary of some of the JSON format and object/string/map/list, such as the Transfer tool class

Original: Some of the/string/map/list tools for JSON format and object

Source code: Http://www.zuidaima.com/share/1550463691508736.htm

Summed up some of the JSON format and object/string/map/list, such as the mutual transfer tool class, there is need to see, need to introduce Jackson-core-asl-1.7.1.jar, Jackson-jaxrs-1.7.1.jar, Jackson-mapper-asl-1.7.1.jar these three jar packages

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{/** * Ignore extra attributes when deserializing */ Mapper.getdeserializationconfig (). Set (DeserializationConfig.Feature.FAIL_ON_UNKNOWN_PROPERTIES, FALSE);/** *                  The null value is ignored, saving space. * @author www.zuidaima.com */Mapper.getserializationconfig (). Setserializationinclusion (JsonSerialize.Inclusion.NO        N_null); /** * Ignore default value wood has changed properties, more space-saving, for the receiver to have the same class * as the Int property initial value is 0, then this property will not be serialized */MApper.getserializationconfig (). Setserializationinclusion (JsonSerialize.Inclusion.NON_DEFAULT);} /** * * @Title: Isjson * @author Kaka * @Description: Determine if jsonstring can be converted to JSON format * @param @param jsonstring * @param @ return * @return Boolean * @throws */public static Boolean Isjson (String jsonstring) {return mapper.canserialize (Ha Shmap.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 Mapp Er.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 Jsont Olist (content, clazz);} /** * * @Title: Jsontolist * @author Kaka * @Description: JSON to list, list element type, will be converted to complete such as list<user> * @param @pa Ram <E> * @param @param content * @param @param clazz * @param @return Element type E's list * @param @throws Exception * @return list<e> * @throws */public static <E> list<e> jsontolist (String content,class<? extends e& Gt Clazz) throws Exception {return Mapper.readvalue (content, Typefactory.collectiontype (Arraylist.class, Clazz));} /** * * @Title: Jsontointarray * @author Kaka * @Description: JSON goto array * @param @param content * @param @return * @p Aram @throws Exception * @return integer[] * @throws */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, Inte Ger.class);} /** * * @Title: Jsontoarray * @author Kaka * @Description: JSON to object array * @param @param <E> * @param @param conte NT * @param @param the object type in the clazz array * @param an array of type @return E, such as user[] * @param @throws Exception * @return e[] * @throw  s */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;}} /** * * @Title: Fromjsontoobject * @author Kaka * @Description: JSON to Java object, compatible with original Util class * @param @param <T> * @par Am @param content * @param @param clazz target type * @param @return * @param @throws Exception * @return T returns an object of type T * @thr oWS */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.read Value (content, clazz);} /** * * @Title: Jsontoobject * @author Kaka * @Description: A jsonstr contains multiple Java objects, taking one of the methods that translates to Java objects * @param @param &l T t> * @param @param content JSON-formatted string * @param @param key to convert the sub-JSON string key * @param @param clazz target type * @param @return return object of type T * @param @throws Exception * @return T * @throws */public static <T> t Jsontoobject (String content, S Tring 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, J Sonnode.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, Jso Nnode.class); Jsonnode path = Rootnode.path (key), if (!path.ismissingnode ()) {return Jsontoobject (path.tostring (), date.class);} Else{return null;}} /** * A JSONSTR contains multiple Java objects, converting the JSON of the specified key into an array of objects * @param content raw JSON String * @param key to convert the part * @param clazz target type * @retu An array of objects of the RN target type * @throws Exception */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 (con Tent, Jsonnode.class); Jsonnode path = Rootnode.path (key), if (!path.ismissingnode ()) {return Jsontoarray (path.tostring (), integer.class);} Else{return null;}} /** * * @Title: Jsontolist * @author Kaka * @Description: A jsonstr contains multiple Java objects and converts the JSON of the specified key into a list<e> method * @para M @param <E> * @param @param content Raw JSON String * @param @param key to convert that part of JSON * @param @param clazz target type * @param @r The Eturn element is a List * @param of the target type @throws Exception * @return list<e> * @throws */public static <E> list<e > jsontolist (String content, string key,class<? extends E> Clazz) throws Exception {Jsonnode RootNode = mapper.re Advalue (content, Jsonnode.class); Jsonnode path = Rootnode.path (key), if (!path.ismissingnode ()) {return toList (path.tostring (), clazz);} Else{return null;}} /** * * @Title: ToJson * @author Kaka * @Description: Object converted to JSON, known issues a b b b in A,a, if A and B are in one o will not convert normally * @para M @param o the object to convert * @param @return JSON-formatted string * @param @throws Exception * @return String * @throws */public Stati C String ToJson (Object o) throws Exception {return mapper.writevalueasstring (o);} /** * * @Title: ToJson * @author Kaka * @Description: Convert to JSON string to out * @param @param out * @param @param o * @param @ Throws Exception * @return void * @throws */public static void ToJson (OutputStream out, Object o) throws Exception {Mapper.writevalue (out, O);} /** * * @Title: ToJson * @author Kaka * @Description: Convert to a JSON string to writer * @param @param out * @param @param o * @para M @throws Exception * @return void * @throws */public static void ToJson (Writer out, Object o) throws Exception {Ma Pper.writevalue (out, O);} public static String Map2json (map map) throws Exception{return ToJson (map);} /** * * @Title: Formatjson * @author Kaka * @Description: JSON string formatting * @param @param json * @param @param fillstringunit * @param @return * @return String * @throws */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;                 Pre-read 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 = Tokenli             St.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); Left justified if (I < tokenlist.size ()-1 && tokenlist.get (i + 1). Equals (":")) {int Filll Ength = 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); }     }     }

Summary of some of the JSON format and object/string/map/list, such as the Transfer tool class