Java converts other data formats into JSON string formats

 PackageCom.wangbo.util;Importjava.beans.IntrospectionException;ImportJava.beans.Introspector;ImportJava.beans.PropertyDescriptor;ImportJava.math.BigDecimal;ImportJava.math.BigInteger;ImportJava.util.HashMap;Importjava.util.List;ImportJava.util.Map;ImportJava.util.Set;/*** Convert other data formats to JSON string format*/ Public classJsonutil {/** object is converted to JSON string*/@SuppressWarnings ("Unchecked")     Public StaticString Object2json (Object obj) {StringBuilder json=NewStringBuilder (); if(obj = =NULL) {json.append ("\"\""); } Else if(objinstanceofString | | ObjinstanceofInteger | | ObjinstanceofFloat|| ObjinstanceofBoolean | | ObjinstanceofShort | | ObjinstanceofDouble|| ObjinstanceofLong | | ObjinstanceofBigDecimal | | ObjinstanceofBigInteger|| ObjinstanceofByte) {Json.append ("\" "). Append (String2json (obj.tostring ())). Append (" \ ""); } Else if(objinstanceofobject[])          {Json.append (Array2json ((object[)) obj); } Else if(objinstanceofList) {Json.append (List2json (List<?>) (obj)); } Else if(objinstanceofMap) {Json.append (Map2json (Map<?,? >) (obj)); } Else if(objinstanceofSet) {Json.append (Set2json (Set<?>) (obj)); } Else{json.append (Bean2json (obj)); }          returnjson.tostring (); }    /** Bean converted to JSON string*/     Public StaticString Bean2json (Object Bean) {StringBuilder json=NewStringBuilder (); Json.append ("{"); propertydescriptor[] Props=NULL; Try{Props= Introspector.getbeaninfo (Bean.getclass (), Object.class). Getpropertydescriptors (); } Catch(Introspectionexception e) {}if(Props! =NULL) {               for(inti = 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 ("}"); }           returnjson.tostring (); }    /** List collection converted to JSON string*/     Public StaticString List2json (list<?>list) {StringBuilder JSON=NewStringBuilder (); 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 ("]"); }          returnjson.tostring (); }    /** Array to JSON string*/     Public StaticString Array2json (object[] array) {StringBuilder json=NewStringBuilder (); 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 ("]"); }          returnjson.tostring (); }    /** Map collection to JSON string*/     Public StaticString Map2json (map<?,? >map) {StringBuilder JSON=NewStringBuilder (); 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 ("}"); }          returnjson.tostring (); }    /** Set set to JSON string*/     Public StaticString Set2json (set<?>set) {StringBuilder JSON=NewStringBuilder (); 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 ("]"); }          returnjson.tostring (); }    /** String converted to JSON string*/     Public Staticstring String2json (string s) {if(s = =NULL)              return""; StringBuilder SB=NewStringBuilder ();  for(inti = 0; I < s.length (); i++) {              CharCH =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 >= ' \u0000 ' && ch <= ' \u001f ') {String ss=integer.tohexstring (CH); Sb.append ("\\u");  for(intk = 0; K < 4-ss.length (); k++) {sb.append (' 0 ');                     } sb.append (Ss.touppercase ()); } Else{sb.append (ch); }            }        }        returnsb.tostring (); }        /** Test Main method*/     Public Static voidMain (string[] args) {Map<string, string> map =NewHashmap<string, string>(); Map.put ("AA", "SSS"); Map.put ("BB", "SSD"); Map.put ("CC", "SUA");    SYSTEM.OUT.PRINTLN (Object2json (map)); }}  

Java converts other data formats into JSON string formats