📄 decode.java
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//package mypub;
import java.io.*;
public class Decode
{
static int num=0;
public char DecodeAscII(String hex) //八位，一个字节，
{
StringToInt to=new StringToInt();
int i=to.HexStringToInt(hex);//调用HexStringToInt
return (char)i;
}
public String DecodeGB2312(String in)
{
StringToInt to=new StringToInt();
String a=String.valueOf(in.charAt(0));
String b=String.valueOf(in.charAt(1));
String hex=a+b;
int i=to.HexStringToInt(hex);
String c=String.valueOf(in.charAt(2));
String d=String.valueOf(in.charAt(3));
hex=c+d;
int j=to.HexStringToInt(hex);
byte bytes[] = {(byte)i,(byte)j};
String s="";
try
{
s=new String(bytes,"gb2312");
}
catch(UnsupportedEncodingException e)
{
System.out.println (e.toString());
}
return s;
}
public String Decodebig5(String in)
{
StringToInt to=new StringToInt();
String a=String.valueOf(in.charAt(0));
String b=String.valueOf(in.charAt(1));
String hex=a+b;
int i=to.HexStringToInt(hex);
String c=String.valueOf(in.charAt(2));
String d=String.valueOf(in.charAt(3));
hex=c+d;
int j=to.HexStringToInt(hex);
byte bytes[] = {(byte)i,(byte)j};
String s="";
try
{
s=new String(bytes,"big5");
}
catch(UnsupportedEncodingException e)
{
System.out.println (e.toString());
}
return s;
}
public String DecodeUTF(String s) //传过来的是16进制
{
UnicodeStringToInt toInt=new UnicodeStringToInt();
String r="";
int len=s.length();
for(int i=0;i<len;i+=6)
{
String temp="";
String a=String.valueOf(s.charAt(i+0));
String b=String.valueOf(s.charAt(i+1));
String hex=a+b;
int x=toInt.UnicodeStringToInt(hex);
a=String.valueOf(s.charAt(i+2));
b=String.valueOf(s.charAt(i+3));
hex=a+b;
int y=toInt.UnicodeStringToInt(hex);
a=String.valueOf(s.charAt(i+4));
b=String.valueOf(s.charAt(i+5));
hex=a+b;
int z=toInt.UnicodeStringToInt(hex);
byte bytes[] = {(byte)x,(byte)y,(byte)z};
try
{
temp=new String(bytes,"utf-8");
}
catch(UnsupportedEncodingException e)
{
System.out.println (e.toString());
}
r=r+temp;
}
return r;
}
public String ToDecode(String input) //第一步
{
Decode d=new Decode();
String result="",h="";
if(input=="")return result;
int count=0;
int len=input.length();
String hex[]=new String[len/2];
EncodeMethod m=new EncodeMethod(); //EncodeMethod
String method=m.method(input);
int num=0;
for(int i=0;i<input.length();i+=2)
{ String temp="";
temp=temp+String.valueOf(input.charAt(i));
temp=temp+String.valueOf(input.charAt(i+1));
hex[num]=temp;//num表示字节的个数
num++;
}
if(method=="big5")
{
for(int j=0;j<num;j++)//每次加一个字节
{
char c=hex[j].charAt(0);
char e=hex[j].charAt(1);
switch(c)
{
case '8':
case '9':
case 'A':
case 'B':
case 'C':
case 'D':
case 'E':
case 'F':
{
int i=j+1;
char u=hex[i].charAt(0);
char v=hex[i].charAt(1);
if(u>='4'&&u<='7'||u>='A'&&u<='F')
{
String str=hex[j]+hex[i];//两个字节16位，呵呵
result=result+d.Decodebig5(str);
}
else
{
result=result+d.DecodeAscII(hex[j]);
result=result+d.DecodeAscII(hex[i]);
}
++j;
} break;//为什么是高8位是从8开始呢？因为0x80~0xFF是中文字符表示范围
default:result=result+d.DecodeAscII(hex[j]);break;
}
}
}
if(method=="gb2312")
{
for(int j=0;j<num;j++)
{
char c=hex[j].charAt(0);
switch(c)
{
case '8':
case '9':
case 'A':
case 'B':
case 'C':
case 'D':
case 'E':
case 'F':
{
count++;
if((count%2)!=0)
{
if(j<num-1)
{
String str=hex[j]+hex[j+1];//两个字节16位，呵呵
result=result+d.DecodeGB2312(str);
}
}
} break;//为什么是高8位是从8开始呢？因为0x80~0xFF是中文字符表示范围
default:result=result+d.DecodeAscII(hex[j]);break;
}
}
}
if(method=="utf-8")
{
for(int j=0;j<num;j++)
{
char a=hex[j].charAt(0);
// char b=hex[j].charAt(1);
switch(a)
{
case'0':h="0000";break;
case'1':h="0001";break;
case'2':h="0010";break;
case'3':h="0011";break;
case'4':h="0100";break;
case'5':h="0101";break;
case'6':h="0110";break;
case'7':h="0111";break;
case'8':h="1000";break;
case'9':h="1001";break;
case'A':h="1010";break;
case'B':h="1011";break;
case'C':h="1100";break;
case'D':h="1101";break;
case'E':h="1110";break;
case'F':h="1111";break;
}
if(h.startsWith("1110"))
{
String str=hex[j]+hex[j+1]+hex[j+2];
result=result+d.DecodeUTF(str);
j+=2;
}
else
result=result+d.DecodeAscII(hex[j]);
}
}
return result;
}
public static void main(String args[])//static 必须在void 之前
{
String input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
Decode d=new Decode();
String result=d.ToDecode(input); //ToDecode
File myFile=new File("result.txt");
try
{
byte[] b=result.getBytes();
FileOutputStream fout=new FileOutputStream(myFile);
fout.write(b);
fout.close();
}
catch(FileNotFoundException e)
{
System.err.println(e);
}
catch(IOException e)
{
System.err.println(e);
}
System.out.println("The Decode result is :\n"+result);
}
}
class StringToInt //被调用
{
public int HexStringToInt(String hex)
{
String a=String.valueOf(hex.charAt(0));
String b=String.valueOf(hex.charAt(1));
char c=hex.charAt(0);
char d=hex.charAt(1);
int h=0;
switch(c)
{
case 'A':h=10*16;break;
case 'B':h=11*16;break;
case 'C':h=12*16;break;
case 'D':h=13*16;break;
case 'E':h=14*16;break;
case 'F':h=15*16;break;
default:h=Integer.parseInt(a)*16;break;
}
switch(d)
{
case 'A':h=h+10;break;
case 'B':h=h+11;break;
case 'C':h=h+12;break;
case 'D':h=h+13;break;
case 'E':h=h+14;break;
case 'F':h=h+15;break;
default:h=h+Integer.parseInt(b);break;
}
return h;
}
}
class UnicodeStringToInt
{
public int UnicodeStringToInt(String hex)
{
String a=String.valueOf(hex.charAt(0));
String b=String.valueOf(hex.charAt(1));
char c=hex.charAt(0);
char d=hex.charAt(1);
int r=0;
switch(c)
{
case 'A':r=r+10*16;break;
case 'B':r=r+11*16;break;
case 'C':r=r+12*16;break;
case 'D':r=r+13*16;break;
case 'E':r=r+14*16;break;
case 'F':r=r+15*16;break;
default:r=r+Integer.parseInt(a)*16;break;
}
switch(d)
{
case 'A':r=r+10;break;
case 'B':r=r+11;break;
case 'C':r=r+12;break;
case 'D':r=r+13;break;
case 'E':r=r+14;break;
case 'F':r=r+15;break;
default:r=r+Integer.parseInt(b);break;
}
return r;
}
}
class EncodeMethod //第二步
{
public String method(String s)
{
Decode de=new Decode(); //调用编码
String result="";
int num=0;
int len=s.length();
String hex[]=new String[len/2];
for(int i=0;i<s.length();i+=2)
{ String temp="";
temp=temp+String.valueOf(s.charAt(i));
temp=temp+String.valueOf(s.charAt(i+1));
hex[num]=temp;
num++;
}
for(int j=0;j<num;j++)
{
result=result+de.DecodeAscII(hex[j]); //调用DecodeAscII
}
int i=result.indexOf("charset=gb2312");
if(i!=-1)
{
System.out.println("charset=gb2312");return "gb2312";
}
i=result.indexOf("charset=utf-8");
if(i!=-1)
{System.out.println("Content-Encoding: utf-8");return "utf-8";
}
i=result.indexOf("charset=big5");
if(i!=-1)
{System.out.println("Content-Encoding: big5");return "big5";
}
return "utf-8";
}
}
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