Do the tools that are commonly used in Java EE projects!

One: Convert time Date type to string type

1. 1 /** 2 * Convert date type to String type3      * @paramDate4      * @return 5      */  6      Public StaticString datetostring (date date) {7DateFormat format =NewSimpleDateFormat ("Yyyy-mm-dd HH:mm:ss"); 8         returnFormat.format (date); 9}

Two: Convert string type to date type

1     /** 2 3 * Convert String type to date type4      * @paramDate5      * @return 6      */  7      Public StaticDate stringtodate (String date) {8DateFormat format =NewSimpleDateFormat ("Yyyy-mm-dd HH:mm:ss"); 9Date d =NULL; Ten         Try {   OneD =format.parse (date);  A}Catch(java.text.ParseException e) { - E.printstacktrace ();  -         }   the         returnD;  -}

Three: Simultaneous judgment of "'" and null two cases

1 /** 2 * Determine if the variable is empty3      * @params4      * @return 5      */  6      Public Static BooleanIsEmpty (String s) {7         if(NULL= = S | | ". Equals (s) | |" ". Equals (S.trim ()) | | "NULL". Equalsignorecase (s)) {  8             return true; 9}Else{  Ten             return false;  One         }   A}

Four: Remove the space before and after the string

1     /** 2 * Remove spaces before and after a string3      * @params4      * @return 5      */  6      Public Staticstring Trim (string s) {7         if(NULL==s) {  8             return""; 9}Else{  Ten             returnS.trim ();  One         }   A}

V: Used to remove the list of empty values and the same items.  

1     /** 2 * Used to remove the list of empty values and the same items. 3      * @paramList4      * @return 5      */  6      PublicList<string> Removesameitem (list<string>list) {  7List<string> diflist =NewArraylist<string>(); 8          for(String t:list) {9             if(t! =NULL&&!diflist.contains (t)) {  Ten Diflist.add (t);  One             }   A         }   -         returndiflist;  -}

Six: The current days plus one day  

1  　　  /** 2 * Number of days plus one3      * @paramDateTime4      * @return 5      * @throwsException6      */  7      Public StaticString Datefamte (String dateTime)throwsexception{8SimpleDateFormat format =NewSimpleDateFormat ("Yyyy-mm-dd"); 9Date Date =Format.parse (dateTime); TenCalendar calendar = Calendar.getinstance ();//Calendar Object OneCalendar.settime (date);//set the current date ACalendar.add (Calendar.day_of_month, 1);//days plus One -         returnFormat.format (Calendar.gettime ());  -}

Seven: Convert a JSON string to a Java object

1  　　  /**     2 * Get an array of Java objects from a JSON array, such as:3 * [{"id": Idvalue, "name": Namevalue}, {"id": Idvalue, "name": Namevalue}, ...] 4      * @paramObject5      * @paramClazz6      * @return     7      */       8      Public Staticobject[] Getdtoarray (String jsonstring, Class clazz) {9Jsonarray array =Jsonarray.fromobject (jsonstring); Tenobject[] obj =Newobject[array.size ()];  One          for(inti = 0; I < array.size (); i++){         AJsonobject Jsonobject =Array.getjsonobject (i);  -Obj[i] =Jsonobject.tobean (Jsonobject, clazz);  -         }         the         returnobj; -}

Do the method in the tool class commonly used in the Java EE Project!