JSON character class, used to convert objects and JSON strings

JSON character class, used to convert objects and JSON strings

JSON character class, used to convert objects and JSON strings

Import java. beans. introspectionException; import java. beans. introspector; import java. beans. propertyDescriptor; import java. lang. reflect. field; import java. math. bigDecimal; import java. math. bigInteger; import java. util. arrayList; import java. util. list; import java. util. map; import java. util. set; /*** JSON character class * is used to convert objects and JSON strings ** @ author aven * @ date 2015-01-14 */public class JSONUtil {public static String object2json (Object obj) {StringBuilder json = new StringBuilder (); if (obj = null) {json. append ("\"\"");} else if (obj instanceof String | obj instanceof Integer | obj instanceof Float | obj instanceof Boolean | obj instanceof Short | obj instanceof Double | obj instanceof Long | obj instanceof Integer bigDecimal | obj instanceof BigInteger | obj instanceof Byte) {json. append ("\""). append (string2json (obj. toString ())). append ("\" ");} else if (obj instanceof Object []) {json. append (array2json (Object []) obj);} else if (obj instanceof List) {json. append (list2json (List
 ) Obj);} else if (obj instanceof Map) {json. append (map2json (Map
 ) Obj);} else if (obj instanceof Set) {json. append (set2json (Set
 ) Obj);} else {json. append (bean2json (obj);} return json. toString ();} public static String bean2json (Object bean) {StringBuilder json = new StringBuilder (); json. append ("{"); PropertyDescriptor [] props = null; try {props = Introspector. getBeanInfo (bean. getClass (), Object. class ). getPropertyDescriptors ();} catch (IntrospectionException e) {} if (props! = Null) {for (int I = 0; I <props. length; I ++) {try {String name = object2json (props [I]. getName (); String value = object2json (props [I]. getReadMethod (). invoke (bean); json. append (name); json. append (":"); json. append (value); json. append (",");} catch (Exception e) {}} json. setCharAt (json. length ()-1, '}');} else {json. append ("}");} return json. toString ();} public static String list2json (List
 List) {StringBuilder json = new StringBuilder (); json. append ("["); if (list! = Null & list. size ()> 0) {for (Object obj: list) {json. append (object2json (obj); json. append (",");} json. setCharAt (json. length ()-1, ']');} else {json. append ("]");} return json. toString ();} public static String array2json (Object [] array) {StringBuilder json = new StringBuilder (); json. append ("["); if (array! = Null & array. length> 0) {for (Object obj: array) {json. append (object2json (obj); json. append (",");} json. setCharAt (json. length ()-1, ']');} else {json. append ("]");} return json. toString ();} public static String map2json (Map
 Map) {StringBuilder json = new StringBuilder (); json. append ("{"); if (map! = Null & map. size ()> 0) {for (Object key: map. keySet () {json. append (object2json (key); json. append (":"); json. append (object2json (map. get (key); json. append (",");} json. setCharAt (json. length ()-1, '}');} else {json. append ("}");} return json. toString ();} public static String set2json (Set
 Set) {StringBuilder json = new StringBuilder (); json. append ("["); if (set! = Null & set. size ()> 0) {for (Object obj: set) {json. append (object2json (obj); json. append (",");} json. setCharAt (json. length ()-1, ']');} else {json. append ("]");} return json. toString ();} public static String string2json (String s) {if (s = null) return ""; StringBuilder sb = new StringBuilder (); for (int I = 0; I <s. length (); I ++) {char ch = s. charAt (I); switch (ch) {case '"': sb. append ("\" "); break; case '\': sb. append ("\\\\"); break; case '\ B': sb. append ("\ B"); break; case '\ F': sb. append ("\ f"); break; case '\ N': sb. append ("\ n"); break; case '\ R': sb. append ("\ r"); break; case '\ t': sb. append ("\ t"); break; case '/': sb. append ("\/"); break; default: if (ch> = '\ u000000' & ch <=' \ u001f') {String ss = Integer. toHexString (ch); sb. append ("\ u"); for (int k = 0; k <4-ss. length (); k ++) {sb. append ('0');} sb. append (ss. toUpperCase ();} else {sb. append (ch) ;}} return sb. toString ();} public static
 
  
T json2Object (String jsonString, Class
  
   
PojoCalss) {if (pojoCalss = null | jsonString. trim (). isEmpty () {return null;} try {T pojo = (T) pojoCalss. newInstance (); Field [] fields = pojo. getClass (). getDeclaredFields (); String simpleName = ""; for (Field f: fields) {try {if (f. getName () = null) {continue;} if (f. getModifiers ()> 2) {continue;} f. setAccessible (true); simpleName = f. getType (). getSimpleName (); String propName =" \ "" + F. getName () + "\": "; Integer idx = jsonString. indexOf (propName); if (idx =-1) {continue;} Integer idxStart = idx + propName. length (); if (jsonString. length () <idxStart) {continue;} String valStart = jsonString. substring (idxStart, idxStart + 1); if (valStart. equals ("[") {valStart = "]";} else if (valStart. equals ("{") {valStart = "}" ;}else {if (! ValStart. equals ("\" ") {valStart =", ";}} String propValue = null; Integer idxEnd =-1; if (valStart. equals (",") {idxEnd = jsonString. indexOf (valStart, idxStart); if (idxEnd =-1) {continue;} propValue = jsonString. substring (idxStart, idxEnd);} else {idxEnd = jsonString. indexOf (valStart, idxStart + 1); if (idxEnd =-1) {continue;} propValue = jsonString. substring (idxStart + 1, idxEnd);} if (propValue = null) {continue;} if (simpleName. equals ("String") | simpleName. equals ("Object") {f. set (pojo, propValue); continue;} if (simpleName. equals ("Long") | simpleName. equals ("long") {f. set (pojo, getLong (propValue); continue;} if (simpleName. equals ("Integer") | simpleName. equals ("int") {f. set (pojo, getInteger (propValue); continue;} if (simpleName. equals ("Boolean") {f. set (pojo, getBoolean (propValue); continue;} if (simpleName. equals ("Double") {f. set (pojo, getDouble (propValue); continue;} if (simpleName. equals ("Float") {f. set (pojo, getFloat (propValue); continue;} if (simpleName. equals ("Byte") {f. set (pojo, getByte (propValue); continue;} if (simpleName. equals ("List") {f. set (pojo, getList (propValue); continue ;}} catch (Exception ex) {ex. printStackTrace () ;}} return pojo;} catch (Exception e) {e. printStackTrace (); return null ;}} public static Long getLong (String propValue) {Long val = 0L; try {val = Long. parseLong (propValue);} catch (Exception el) {} return val;} public static Integer getInteger (String propValue) {Integer val = 0; try {val = Integer. parseInt (propValue);} catch (Exception el) {} return val;} public static Boolean getBoolean (String propValue) {Boolean val = ("1 ". equals (propValue) | "true ". inclusignorecase (propValue); return val;} public static Double getDouble (String propValue) {Double val = 0D; try {val = Double. parseDouble (propValue);} catch (Exception el) {} return val;} public static Float getFloat (String propValue) {Float val = 0F; try {val = Float. parseFloat (propValue);} catch (Exception el) {} return val;} public static Byte getByte (String propValue) {Byte val = 0; try {val = Byte. parseByte (propValue);} catch (Exception el) {} return val;} public static List
   
    
GetList (String propValue) {List
    
     
ValList = new ArrayList
     
      
(); If (propValue! = Null &&! PropValue. trim (). isEmpty () {try {String [] aptEvents = propValue. replace ("\"",""). toLowerCase (). split (","); valList = java. util. arrays. asList (aptEvents);} catch (Exception ex) {ex. printStackTrace () ;}} return valList;} public static void main (String [] args) {String json = JSONUtil. object2json (new Data (); System. out. println (json );}}