java数据库唯一id生成工具类

本文实例为大家分享了java数据库唯一id生成工具类的具体代码，供大家参考，具体内容如下

import java.io.file;
import java.text.simpledateformat;
import java.util.date;
import java.util.map;
import java.util.random;
import java.util.uuid;
import org.springframework.dao.emptyresultdataaccessexception;
import org.springframework.jdbc.core.jdbctemplate;

public class uniqueidutil
{
 private static long adjust = 1l;
 private static long nextid = 0l;
 private static long lastid = -1l;
 private static long randomleng = 6l;
 private static jdbctemplate jdbctemplate;
 private static simpledateformat dateformat = new simpledateformat("yyyymmddhhmmss");
 
 private static void init()
 {
  try
  {
   jdbctemplate = (jdbctemplate)apputil.getbean("jdbctemplatesn");
   string str2 = appconfigutil.get("genid.adjust");
   if (str2 != null) {
    adjust = integer.parseint(str2);
   }
  }
  catch (exception localexception)
  {
   adjust = 1l;
   string str3 = appconfigutil.get("genid.adjust");
   if (str3 != null) {
    adjust = integer.parseint(str3);
   }
  }
 }
 
 private static void getnextidblock()
 {
  if (jdbctemplate == null) {
   init();
  }
  long locallong = long.valueof(-1l);
  integer localinteger = integer.valueof(-1);
  string str1 = "select bound,incremental from sys_db_id t where t.id=?";
  string str2 = "update sys_db_id set bound=? where id=?";
  try
  {
   map localmap = jdbctemplate.queryformap(str1, new object[] { long.valueof(adjust) });
   locallong = long.valueof(long.parselong(localmap.get("bound").tostring()));
   localinteger = integer.valueof(integer.parseint(localmap.get("incremental").tostring()));
   nextid = locallong.longvalue();
   lastid = locallong.longvalue() + localinteger.intvalue();
   jdbctemplate.update(str2, new object[] { long.valueof(lastid), long.valueof(adjust) });
  }
  catch (emptyresultdataaccessexception localemptyresultdataaccessexception)
  {
   insertnewcomputer();
  }
 }
 
 private static void insertnewcomputer()
 {
  try
  {
   lastid = 10000l;
   string str = "insert into sys_db_id (id,incremental,bound) values(" + adjust + ",10000," + lastid + ")";
   jdbctemplate.update(str);
  }
  catch (exception localexception)
  {
   localexception.printstacktrace();
  }
 }
 
 public static synchronized long genid()
 {
  if (lastid <= nextid) {
   getnextidblock();
  }
  long l = nextid++;
  return l + adjust * 10000000000000l;
 }
 
 public static final string getguid()
 {
  uuid localuuid = uuid.randomuuid();
  return localuuid.tostring();
 }
 
 public static final string getrandom()
 {
  random localrandom = new random();
  string str1 = "";
  for (int i = 0; i < randomleng; i++)
  {
   string str2 = string.valueof(localrandom.nextint(10));
   str1 = str1 + str2;
  }
  return str1;
 }
 
 public static string genorderno()
 {
  long l = genid();
  string str = dateformat.format(new date());
  return str + l;
 }
 
 public static void main(string[] paramarrayofstring)
  throws exception
 {}
}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。