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