Java全角半角转换（转载）

package com.test;      
      
public class test {      
    public static void main(String[] args) {      
    String QJstr = "hello";      
    String QJstr1 = "ｈｅ，。ｈ‘“”ｅ";      
      
    String result = BQchange(QJstr);      
    String result1 = QBchange(QJstr1);      
      
    System.out.println(QJstr + "\n" + result);      
    System.out.println(QJstr1 + "\n" + result1);      
    }      
      
    //半角转全角      
    public static final String BQchange(String QJstr) {      
    String outStr = "";      
    String Tstr = "";      
    byte[] b = null;      
      
    for (int i = 0; i< QJstr.length(); i++) {      
    try {      
    Tstr = QJstr.substring(i, i + 1);      
    b = Tstr.getBytes("unicode");      
    } catch (java.io.UnsupportedEncodingException e) {      
    e.printStackTrace();      
    }      
    if (b[3] != -1) {      
    b[2] = (byte) (b[2] - 32);      
    b[3] = -1;      
    try {      
    outStr = outStr + new String(b, "unicode");      
    } catch (java.io.UnsupportedEncodingException e) {      
    e.printStackTrace();      
    }      
    } else      
    outStr = outStr + Tstr;      
    }      
    return outStr;      
    }      
      
    //全角转半角      
    public static final String QBchange(String QJstr) {      
    String outStr = "";      
    String Tstr = "";      
    byte[] b = null;      
      
    for (int i = 0; i< QJstr.length(); i++) {      
    try {      
    Tstr = QJstr.substring(i, i + 1);      
    b = Tstr.getBytes("unicode");      
    } catch (java.io.UnsupportedEncodingException e) {      
    e.printStackTrace();      
    }      
    if (b[3] == -1) {      
    b[2] = (byte) (b[2] + 32);      
    b[3] = 0;      
    try {      
    outStr = outStr + new String(b, "unicode");      
    } catch (java.io.UnsupportedEncodingException e) {      
    e.printStackTrace();      
    }      
    } else      
    outStr = outStr + Tstr;      
    }      
    return outStr;      
    }      
          
      
    /**/// /      
    /// 转全角的函数(SBC case)      
    ///      
    /// 任意字符串      
    ///全角字符串      
    ///      
    ///全角空格为12288，半角空格为32      
    ///其他字符半角(33-126)与全角(65281-65374)的对应关系是：均相差65248      
    ///      
    public static String ToSBC(String input) {      
    //半角转全角：      
    char[] c = input.toCharArray();      
    for (int i = 0; i< c.length; i++) {      
    if (c[i] == 32) {      
    c[i] = (char) 12288;      
    continue;      
    }      
    if (c[i]< 127)      
    c[i] = (char) (c[i] + 65248);      
    }      
    return new String(c);      
    }      
      
    /**/// /      
    /// 转半角的函数(DBC case)      
    ///      
    /// 任意字符串      
    ///半角字符串      
    ///      
    ///全角空格为12288，半角空格为32      
    ///其他字符半角(33-126)与全角(65281-65374)的对应关系是：均相差65248      
    ///      
    public static String ToDBC(String input) {      
    char[] c = input.toCharArray();      
    for (int i = 0; i< c.length; i++) {      
    if (c[i] == 12288) {      
    c[i] = (char) 32;      
    continue;      
    }      
    if (c[i]> 65280&& c[i]< 65375)      
    c[i] = (char) (c[i] - 65248);      
    }      
    return new String(c);      
    }      
}

本文出自：http://goby2008.iteye.com/blog/413249