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【Java】工具类
作者:贱贱 / 发布于2014/5/20/ 299

	package com.common.util;

	import java.text.DecimalFormat;
	import java.text.ParseException;
	import java.text.SimpleDateFormat;
	import java.util.Date;
	import java.util.regex.Matcher;
	import java.util.regex.Pattern;

	import javax.servlet.http.HttpServletRequest;

	public class CheckData {
	public CheckData()
	{
	}

	
	public static String checkString(String start)
	{
	 String end = null;
	 if(start == null)
	 return "";
	 int length = start.length();
	 int sub = start.indexOf("'");
	 if(sub == -1)
	 end = start;
	 else
	 if(length == sub)
	 end = (new StringBuilder(String.valueOf(start))).append("'").toString();
	 else
	 end = (new StringBuilder(String.valueOf(start.substring(0, sub + 1)))).append("'").append(checkString(start.substring(sub + 1, length))).toString();
	 return end;
	}
	
	/***
	 * 判断是否为中文
	 * @param str
	 * @return
	 */
	public static boolean isCn(String str)
	{
	
	 if(str==null || str.equals("")){
	 return false;
	 }
	 Pattern pattern = Pattern.compile("^[\u4e00-\u9fa5]+$");
	 Matcher isNum = pattern.matcher(str);
	 if( !isNum.matches() )
	 {
	 return false;
	
	 }
	 return true;
	}
	
	/***
	 * 判断是否为数字
	 * @param str
	 * @return
	 */
	public static boolean isNumer(String str)
	{
	 if(str==null || str.equals("")){
	 return false;
	 }
	 Pattern pattern = Pattern.compile("[0-9]*");
	 Matcher isNum = pattern.matcher(str);
	 if( !isNum.matches() )
	 {
	 return false;
	 }
	 return true;
	}
	/***
	 * 判断是否为字母
	 * @param str
	 * @return
	 */
	public static boolean isLetters(String str)
	{
	 if(str==null || str.equals("")){
	 return false;
	 }
	 Pattern pattern = Pattern.compile("[a-zA-Z]+");
	 Matcher isNum = pattern.matcher(str);
	 if( !isNum.matches() )
	 {
	 return false;
	 }
	 return true;
	}

	/******************时间转换********************/
	public String getDate(){
	 SimpleDateFormat df = new SimpleDateFormat("yyyyMMddhhmmss");//设置日期格式
	 String date=df.format(new Date());// new Date()为获取当前系统时间
	 return date;
	}
	public Date getDate(String reqDate){
	 try {
	 SimpleDateFormat df = new SimpleDateFormat("yyyyMMddhhmmss");
	 Date date= df.parse(reqDate);
	 return date;
	 } catch (ParseException e) {
	 // TODO Auto-generated catch block
	 e.printStackTrace();
	 return null;
	 }
	}
	
	/******************数据类型转换********************/
	public static Long getLong(String str){
	 if(str!=null && !str.equals("")){
	 return Long.parseLong(str);
	 }else{
	 return null;
	 }
	}
	public static Integer getInteger(String str){
	 if(str!=null && !str.equals("")){
	 return Integer.parseInt(str);
	 }else{
	 return null;
	 }
	}
	public static String getDouble(Double dob){
	 DecimalFormat df=new DecimalFormat("0.00");
	 return df.format(dob);
	}
	/**
	 * 获取客户端IP
	 * @param request
	 * @return
	 */
	public static String getIpAddr(HttpServletRequest request) {
	 String ip = request.getHeader("x-forwarded-for");
	 if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
	 ip = request.getHeader("Proxy-Client-IP");
	 }
	 if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
	 ip = request.getHeader("WL-Proxy-Client-IP");
	 }
	 if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
	 ip = request.getRemoteAddr();
	 }
	 return ip;
	 }
	public static String utf8Togb2312(String str){
	 StringBuffer sb = new StringBuffer();
	 for(int i=0; i<str.length(); i++) {
	 char c = str.charAt(i);
	 switch (c) {
	 case '+':
	 sb.append(' ');
	 break;
	 case '%':
	 try {
	 sb.append((char)Integer.parseInt(
	 str.substring(i+1,i+3),16));
	 }
	 catch (NumberFormatException e) {
	 throw new IllegalArgumentException();
	 }
	 i += 2;
	 break;
	 default:
	 sb.append(c);
	 break;
	 }
	 }
	 // Undo conversion to external encoding
	 String result = sb.toString();
	 String res=null;
	 try{
	 byte[] inputBytes = result.getBytes("8859_1");
	 res= new String(inputBytes,"UTF-8");
	 }
	 catch(Exception e){}
	 return res;
	}

	
	}
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