Mystringutils (convert object to JSON)

Import Java. beans. introspectionexception; import Java. beans. introspector; import Java. beans. propertydescriptor; import Java. math. bigdecimal; import Java. math. biginteger; import Java. text. simpledateformat; import Java. util. date; import Java. util. list; import Java. util. map; import Java. util. set;/*** 2011-4-22 *** @ author chen_liang */public class mystringutils {/*** @ Param Str * Format: yyyy-mm-dd ** @ return J Ava. util. date */public static date string2date (string Str) throws exception {simpledateformat SDF = new simpledateformat ("yyyy-mm-dd"); Return SDF. parse (STR);}/*** convert the date to a string in the format of yyyy-mm-dd ** @ return */public static string data2string (date) {simpledateformat SDF = new simpledateformat ("yyyy-mm-dd"); Return SDF. format (date);}/*** @ Param OBJ * any object * @ return string */public static string object2js On (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. to String ())). 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 ();}/*** @ Param bean * bean object * @ return string */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) {e. printstacktrace ();} 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) {e. printstacktrace () ;}} JSON. setcharat (JSON. length ()-1, '}');} else {JSON. append ("}");} return JSON. tostring ();} // Private methods ............ .................................... /*** @ Param map * map object * @ return string */Private 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 ();}/*** @ Param Set * Collection object * @ return string */Private 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 ();}/*** @ Param S * parameter * @ return string */Private 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. le Ngth (); k ++) {sb. append ('0');} sb. append (ss. touppercase ();} else {sb. append (CH) ;}} return sb. tostring ();}/*** @ Param array * object array * @ return string */Private 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 ();}/*** @ Param list * list object * @ return string */Private 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 ();}}