字符串中抽取某类型的字符串

旧代码，先贴上来，待整理

import java.io.UnsupportedEncodingException;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;

public class StringHandler {

	public static final int CH_STR = 1;
	public static final int ALPHA_STR = 2;
	public static final int NUM_STR = 3;

	/**
	 * 1.抽取中文字符串
	 * 
	 * @param str
	 * @return
	 * @throws UnsupportedEncodingException
	 */
	public String extraChinese(String str) throws UnsupportedEncodingException {

		String result;

		byte[] bytes = str.getBytes("gbk");
		byte[] bc = new byte[bytes.length];
		int j = 0;
		for (int i = 0; i < bytes.length;) {
			if (bytes[i] < 0) {
				bc[j++] = bytes[i++];
				bc[j++] = bytes[i];
			}
			i++;
		}

		byte[] br = new byte[j];
		for (int i = 0; i < j; i++) {
			br[i] = bc[i];
		}
		result = new String(br, "gbk");
		return result;
	}

	/**
	 * 抽取字母
	 * @param str
	 * @return
	 * @throws UnsupportedEncodingException
	 */
	public String extraAlpha(String str) throws UnsupportedEncodingException {

		String result;

		byte[] bytes = str.getBytes("gbk");
		byte[] bc = new byte[bytes.length];
		int j = 0;
		for (int i = 0; i < bytes.length;) {
			if ((bytes[i] >= 0x41 && bytes[i] <= 0x5a)
					|| (bytes[i] >= 0x61 && bytes[i] <= 0x7a)) {
				bc[j++] = bytes[i];
			}
			i++;
		}

		byte[] br = new byte[j];
		for (int i = 0; i < j; i++) {
			br[i] = bc[i];
		}
		result = new String(br, "gbk");
		return result;
	}

	/**
	 * 抽取数字
	 * @param str
	 * @return
	 * @throws UnsupportedEncodingException
	 */
	public String extraNum(String str) throws UnsupportedEncodingException {

		String result;

		byte[] bytes = str.getBytes("gbk");
		byte[] bc = new byte[bytes.length];
		int j = 0;
		for (int i = 0; i < bytes.length;) {
			if (bytes[i] >= 0x30 && bytes[i] <= 0x39) {
				bc[j++] = bytes[i];
			}
			i++;
		}

		byte[] br = new byte[j];
		for (int i = 0; i < j; i++) {
			br[i] = bc[i];
		}
		result = new String(br, "gbk");
		return result;
	}

	/**
	 * 2.根据类型抽取字符串
	 * @param str
	 * @param type
	 * @return
	 * @throws UnsupportedEncodingException
	 */
	public String extraStr(String str, int type)
			throws UnsupportedEncodingException {

		String result;
		if (this.CH_STR == type) {
			result = extraChinese(str);
		} else if (this.ALPHA_STR == type) {
			result = this.extraAlpha(str);
		} else if (this.NUM_STR == type) {
			result = this.extraNum(str);
		} else {
			result = "";
		}
		return result;
	}

	/**
	 * 3 根据多个类型抽取多个字符串组
	 * @param str
	 * @param types
	 * @return
	 * @throws UnsupportedEncodingException
	 */
	public Map<Integer, String> extraStr(String str, int... types)
			throws UnsupportedEncodingException {
		Map<Integer, String> map = new HashMap<Integer, String>();
		if (types.length > 3) {
			throw new ArrayIndexOutOfBoundsException();
		} else {
			for (int i = 0; i < types.length; i++) {

				map.put(types[i], extraStr(str, types[i]));
			}

		}
		return map;
	}

	/**
	 * @param args
	 * @throws UnsupportedEncodingException
	 */
	public static void main(String[] args) throws UnsupportedEncodingException {
		// TODO Auto-generated method stub

		StringHandler sh = new StringHandler();

		String test = new String("hello你world好2a!");
		
		//test1
		System.out.println(sh.extraChinese(test));

		//test2
		System.out.println(sh.extraStr(test, ALPHA_STR));

		//test3
		Map<Integer, String> result = sh.extraStr(test, ALPHA_STR, CH_STR, NUM_STR);
		Set<Integer> types = result.keySet();
		for(int type : types){
			if(type == StringHandler.ALPHA_STR){
				System.out.println("字母：" + result.get(type));
			}else if (type == StringHandler.CH_STR){
				System.out.println("中文：" + result.get(type)) ;
			}else{
				System.out.println("数字：" + result.get(type));
			}
			
		}
	}

}