Java Common Code

1. Record the change of an entity class (table)

① Two entity class comparisons, data changes before and after recording, accurate to the values of each column

②,

  1 package Gwm.xtkf.tool;  2 3 Import Java.lang.reflect.Field;  4 Import Java.lang.reflect.Method;  5 Import Java.text.SimpleDateFormat;  6 Import Java.util.Date;  7 Import Java.util.HashMap;  8 Import Java.util.Locale; 9 Import Java.util.Map; Ten import Xs.jszx.systemmanage.domain.Purpose; public class Compareclass {All public static String Compareclass (object from, Object target, Map<str             ING, string> describe) throws exception{if (from.getclass () = = Target.getclass ()) {18 class<? Extends object> C = Target.getclass (); Field field[] = C.getdeclaredfields (); StringBuilder str = new StringBuilder ();    A (Field F:field) {The String type = F.getgenerictype (). toString (); Gets the type of the property, if (Describe.get (F.getname ())!=null) {+ Object FV = i Nvokemethod (from, F.getname (), type);         27            Object TV = InvokeMethod (target, F.getname (), type); if (fv!=null && tv!=null) {if (!fv.equal S (TV)) {Str.append (Describe.get (F.getname ()) + ":" + TV + + "+ FV +"; ");                     (Fv==null && tv==null) {} 35 else{(Fv!=null && fv.tostring (). Trim ( ). Length () >0) {str.append (Describe.get (F.getname ()) + ":" + TV + "+ FV +"; ");                             (Tv!=null && tv.tostring (). Trim (). Length () >0) {41 Str.append (Describe.get (F.getname ()) + ":" + TV + + "+ FV +"; ");           42} 43 44} 45} 46             () str.tostring return (); The else{("Unchecke") is @SuppressWarnings ("         D ") The private static object InvokeMethod (object owner, String methodName, String type) throws Exception {58   @SuppressWarnings ("Rawtypes") ownerclass Class = Owner.getclass ();   MethodName = methodname.substring (0, 1). toUpperCase () + methodname.substring (1);   method = null;   try {n = ownerclass.getmethod ("get" + methodName);   The SecurityException (e) {nosuchmethodexception} catch (e) {n-null; 69} 70//If type is a class type, it is preceded by "class", followed by class name 71//To convert the date type Type.equals ("Class JAV A.util.date ")) {Method.invoke Date date = (date) (owner);= null) {SimpleDateFormat SDF = new SimpleDateFormat ("Yyyy-mm-dd", locale.us);  Sdf.format return (date); Method.invoke} (owner); n} bayi, public static void main (string[] args) {Purpose purpose1 = new Purpose (); 8 5 Purpose purpose2 = new Purpose (); Purpose1.setname ("residential"); Purpose2.setname ("Villa"); map<string, string> Map = new hashmap<string, string> (); Map.put ("name", "title"); 94 try {System.out.println (Compareclass (purpose1, PURPOSE2, map)); (Exception e) {//TODO auto-generated catch block 98 e.printstacktrace (); 99}100}101}

Compareclass

Java Common Code