quoted-printable 编码与解码

quoted-printable 编码与解码

packagejavas;

importjava.io.ByteArrayOutputStream;
importjava.io.UnsupportedEncodingException;

publicclassTest
...{
publicstaticvoidmain(String[]arg)
...{
System.out.println(qpEncodeing("sd=fsd辰s西南地区dffdf=可耕地sdfsdff"+" "
+"sdfsd "+"可耕地zz"));
System.out.println(qpDecoding(qpEncodeing("sd=fsd辰s西南地区dffdf=可耕地sdfsdff"
+" "+"sdfsd "+"可耕地zz")));
}

/***//**
*quoted-printable编码就是这个方法
*/
publicstaticStringqpEncodeing(Stringstr)
...{
char[]encode=str.toCharArray();
StringBuffersb=newStringBuffer();
for(inti=0;i<encode.length;i++)
...{
if((encode[i]>='!')&&(encode[i]<='~')&&(encode[i]!='=')
&&(encode[i]!=' '))
...{
sb.append(encode[i]);
}
elseif(encode[i]=='=')
...{
sb.append("=3D");
}
elseif(encode[i]==' ')
...{
sb.append("= ");
}
else
...{
StringBuffersbother=newStringBuffer();
sbother.append(encode[i]);
Stringss=sbother.toString();
byte[]buf=null;
try
...{
buf=ss.getBytes("utf-8");
}
catch(UnsupportedEncodingExceptione)
...{
e.printStackTrace();
}
if(buf.length==3)
...{

for(intj=0;j<3;j++)
...{
Strings16=String.valueOf(Integer.toHexString(buf[j]));
//抽取中文字符16进制字节的后两位,也就是=E8等号后面的两位,
//三个代表一个中文字符
charc16_6;
charc16_7;
if(s16.charAt(6)>=97&&s16.charAt(6)<=122)
...{
c16_6=(char)(s16.charAt(6)-32);
}
else
...{
c16_6=s16.charAt(6);
}
if(s16.charAt(7)>=97&&s16.charAt(7)<=122)
...{
c16_7=(char)(s16.charAt(7)-32);
}
else
...{
c16_7=s16.charAt(7);
}
sb.append("="+c16_6+c16_7);
}
}

}
}
returnsb.toString();
}

/***//**
*quoted-printable解码
*
*@authorissuesr
*@paramstr
*@return无
*@date2007-6-24
*/
publicfinalstaticStringqpDecoding(Stringstr)
...{
if(str==null)
...{
return"";
}
try
...{
StringBuffersb=newStringBuffer(str);
for(inti=0;i<sb.length();i++)
...{
if(sb.charAt(i)==' '&&sb.charAt(i-1)=='=')
...{
//解码这个地方也要修改一下
//sb.deleteCharAt(i);
sb.deleteCharAt(i-1);
}
}
str=sb.toString();
byte[]bytes=str.getBytes("US-ASCII");
for(inti=0;i<bytes.length;i++)
...{
byteb=bytes[i];
if(b!=95)
...{
bytes[i]=b;
}
else
...{
bytes[i]=32;
}
}
if(bytes==null)
...{
return"";
}
ByteArrayOutputStreambuffer=newByteArrayOutputStream();
for(inti=0;i<bytes.length;i++)
...{
intb=bytes[i];
if(b=='=')
...{
try
...{
intu=Character.digit((char)bytes[++i],16);
intl=Character.digit((char)bytes[++i],16);
if(u==-1||l==-1)
...{
continue;
}
buffer.write((char)((u<<4)+l));
}
catch(ArrayIndexOutOfBoundsExceptione)
...{
e.printStackTrace();
}
}
else
...{
buffer.write(b);
}
}
returnnewString(buffer.toByteArray(),"UTF-8");
}
catch(Exceptione)
...{
e.printStackTrace();
return"";
}
}
}