Java处理全角半角问题

import java.io.UnsupportedEncodingException;
import org.apache.axis.utils.StringUtils;

/**
*
* ClassName: CharByteConverter <br/>
* Function:  半角全角转换工具<br/>
* date: 2017年6月19日 下午6:20:17 <br/>
* @version
*/
public class CharByteConverter {

/**
* 全角转半角
*
* @param str
* @return
*
* @author mjorcen
* @email mjorcen@gmail.com
* @dateTime Sep 27, 2014 2:51:50 PM
* @version 1
*/
@Deprecated
public static final String toSingleByte(String str) {
StringBuffer outStrBuf = new StringBuffer("");

String Tstr = "";
byte[] b = null;
for (int i = 0; i < str.length(); i++) {
Tstr = str.substring(i, i + 1);
// 全角空格转换成半角空格
if (Tstr.equals("　")) {
outStrBuf.append(" ");
continue;
}
try {
b = Tstr.getBytes("unicode");
// 得到 unicode 字节数据
if (b[2] == -1) {
// 表示全角
b[3] = (byte) (b[3] + 32);
b[2] = 0;
outStrBuf.append(new String(b, "unicode"));
} else {
outStrBuf.append(Tstr);
}
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

} // end for.
return outStrBuf.toString();

}

/**
* 半角转全角
*
* @param str
* @return
*
* @author mjorcen
* @email mjorcen@gmail.com
* @dateTime Sep 27, 2014 2:52:06 PM
* @version 1
*/
@Deprecated
public static final String toDoubleByte(String str) {
if(StringUtils.isEmpty(str)){
return null;
}
StringBuffer outStrBuf = new StringBuffer("");
String Tstr = "";
byte[] b = null;
for (int i = 0; i < str.length(); i++) {
Tstr = str.substring(i, i + 1);
if (Tstr.equals(" ")) {
// 半角空格
outStrBuf.append(Tstr);
continue;
}
try {
b = Tstr.getBytes("unicode");
if (b[2] == 0) {
// 半角
b[3] = (byte) (b[3] - 32);
b[2] = -1;
outStrBuf.append(new String(b, "unicode"));
} else {
outStrBuf.append(Tstr);
}
return outStrBuf.toString();
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

}
return outStrBuf.toString();
}

/**
* 半角转全角
*
* @param str
* @return
*
* @author mjorcen
* @email mjorcen@gmail.com
* @dateTime Sep 27, 2014 2:52:31 PM
* @version 1
*/
public static String ToSBC(String str) {
if(StringUtils.isEmpty(str)){
return null;
}
char c[] = str.toCharArray();
for (int i = 0; i < c.length; i++) {
if (c[i] == ' ') {
c[i] = '\u3000';
} else if (c[i] < '\177') {
c[i] = (char) (c[i] + 65248);

}
}
return new String(c);
}

/**
* 全角转半角
*
* @param str
* @return
*
* @author mjorcen
* @email mjorcen@gmail.com
* @dateTime Sep 27, 2014 2:52:50 PM
* @version 1
*/
public static String ToDBC(String str) {
char c[] = str.toCharArray();
for (int i = 0; i < c.length; i++) {
if (c[i] == '\u3000') {
c[i] = ' ';
} else if (c[i] > '\uFF00' && c[i] < '\uFF5F') {
c[i] = (char) (c[i] - 65248);

}
}
String returnString = new String(c);
return returnString;
}

public static void main(String[] args) {
String str = "８１４乡道阿斯蒂芬１２３／．１２，４１２看２家１快２看了就２；看了２叫看来＋看来家１２考虑就２３；了３接口２了２会２，．水电费苦辣时间的２　　１２５１２３１２３１２１２０９－０２１～！＠＃＄％＾＆＊（）＿";
String result = ToDBC(str);
System.out.println(result);
String newstr=ToSBC(result);
System.out.println(newstr);
String newstr1=ToSBC(null);
System.out.println(newstr);
String newstr2=ToSBC("");
System.out.println(newstr);
}

}