commonbean.java

以当前时间生成yyyyMMddHHmmss格式的字符串 合并hashmap 等多项功能

package common.beans;

import java.util.ArrayList;
import java.util.Set;
import java.util.HashMap;
import common.db.DatabaseBean;
public class CommonBean {
	/**
	 * 以当前时间生成yyyyMMddHHmmss格式的字符串
	 * @return
	 */
	public static String generateNameByTime(){
		java.util.Date   date   =   new   java.util.Date();   
		java.text.SimpleDateFormat   sd   =   new   java.text.SimpleDateFormat("yyyyMMddHHmmss");   
		String   fileName   =   sd.format(date);
		return fileName;
	}
	public static String replaceString(String src,char c,String s2){
		StringBuffer buffer=new StringBuffer();
		char[]b=src.toCharArray(); 
		for(int i=0;i<b.length;i++){
			if(c==b[i])buffer.append(s2);
			else buffer.append(b[i]);
		}
		return buffer.toString();
	}
	public static String eNull(Object obj){
		return (obj==null)?"":obj.toString();
	}
	public static String getKeysStr(HashMap map){ 		
		Object [] keys=CommonBean.getMapKeys(map);
		StringBuffer buffer=new StringBuffer();
		for(int i=0;i<keys.length-1;i++)
			buffer.append(keys[i].toString()+",");
		
		if(keys[keys.length-1]!=null)
			buffer.append(keys[keys.length-1].toString());
		return buffer.toString();
	}
	/**
	 * 将map2中合并到map1
	 * @param map1
	 * @param map2
	 */
	public static HashMap mergetHashMap(HashMap map1,HashMap map2){
		Object [] keys;
		HashMap map=new HashMap();
		keys=getMapKeys(map1);
		for(int i=0;i<keys.length;i++){
			map.put(keys[i], map1.get(keys[i]));
		}
		keys=getMapKeys(map2);
		for(int i=0;i<keys.length;i++){
			map.put(keys[i], map2.get(keys[i]));
		}
		return map;
	}
	public static Object[] getMapKeys(HashMap map){
		Object [] keys;
		Set set = map.keySet();
		keys = set.toArray();
		return keys;
	}
	public static int getSequence(DatabaseBean db,String sequence){
		int id=-1;
		String sql="values nextval for " + sequence;
		db.executeQuery(sql);
		try{
			db.rs.next();
			id=db.rs.getInt(1);
		}catch(Exception e){
			e.printStackTrace();
		}finally{
			db.close();
		}
		return id;
	} 
	/**
	 * 显示一个ArrayList，调试程序使用
	 * @param al
	 */
	public static void showAl(ArrayList al){
		for(int i=0;i<al.size();i++){
			String [] temp=(String [])al.get(i);
			for(int j=0;j<temp.length;j++){
				System.out.print(temp[j]+"	");
			}
			System.out.println();
		}
	}
	/**
	 * 显示一个String [][]，调试程序使用
	 * @param al
	 */
	public static void showArray(String [][]al){
		for(int i=0;i<al.length;i++){
			String [] temp=(String [])al[i];
			for(int j=0;j<temp.length;j++){
				System.out.print(temp[j]+"	");
			}
			System.out.println();
		}
	}
}