JAVA全角和半角的转换

publicclasschange{

publicstaticvoidmain(String[]args){

StringQJstr="全角转半角ＤＡＯ";

Stringresult=SBCchange(QJstr);

System.out.println(QJstr+"\n"+result);

}


publicstaticfinalStringSBCchange(StringQJstr)
{
StringoutStr="";
StringTstr="";
byte[]b=null;

for(inti=0;i<QJstr.length();i++)<qjstr.length><br>{<br>try<br>{<br>Tstr=QJstr.substring(i,i+1);<br>b=Tstr.getBytes("unicode");<br>}<br>catch(java.io.UnsupportedEncodingExceptione)<br>{<br>e.printStackTrace();<br>}<br><br>if(b[3]==-1)<br>{<br>b[2]=(byte)(b[2]+32);<br>b[3]=0;<br><br>try<br>{<br>outStr=outStr+newString(b,"unicode");<br>}<br>catch(java.io.UnsupportedEncodingExceptione)<br>{<br>e.printStackTrace();<br>}<br>}elseoutStr=outStr+Tstr;<br>}<br><br>returnoutStr;<br>}<br><br>}<br></qjstr.length>






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;
}
}



/**/// /<summary><br>// / 转全角的函数(SBC case)<br>// /</summary>
// /任意字符串
// /<returns>全角字符串</returns>
// /<remarks><br>// /全角空格为12288，半角空格为32<br>// /其他字符半角(33-126)与全角(65281-65374)的对应关系是：均相差65248<br>// /</remarks>
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);
}

/**/// /<summary><br>// / 转半角的函数(DBC case)<br>// /</summary>
// /任意字符串
// /<returns>半角字符串</returns>
// /<remarks><br>// /全角空格为12288，半角空格为32<br>// /其他字符半角(33-126)与全角(65281-65374)的对应关系是：均相差65248<br>// /</remarks>
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);
}