Java中全半角之间如何转换

      下面提供给大家的是JAVA中全半角之间转换的代码，相信对刚学JAVA的朋友会有很大帮助。

      public class change {
      public static void main(String[] args) {
      String QJstr="全角转半角ＤＡＯ";
      String result=SBCchange(QJstr);
      System.out.println(QJstr+"\n"+result);
      }
      public static final String SBCchange(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;
      }
      }
      public class Test {
      public static void main(String[] args) {
      String QJstr = "hello";
      String QJstr1 = "ｈｅｈｅ";
      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);