java全角半角转换

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);   
    }   
}