[英]how to detect wrong encoding
該程序寫入2個文件。
在正確的文件中,字符串為“ IL RITROVO AL 1°PIANO”
在錯誤的文件中,字符串為“ IL RITROVO AL 1NUL PIANO”。
在第二種情況下,“°”字符有錯誤的解釋; 在寫之前如何檢測到這種情況?
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
public class WrongWriter {
static File wrongFile = new File("C:/Users/utente/Desktop/wrongFile.txt");
static File rightFile = new File("C:/Users/utente/Desktop/rightFile.txt");
public static void main(String[] args) throws IOException {
byte[] wrongBytes = new byte[]{
73, 76, 32, 82, 73, 84, 82, 79, 86, 79, 32, 65, 76, 32, 49, 0, 32, 80, 73, 65, 78, 79, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32
};
write(wrongFile, wrongBytes) ;
byte[] rightBytes = "IL RITROVO AL 1° PIANO".getBytes();
write(rightFile, rightBytes) ;
}
static void write(File file, byte[] bytes) throws IOException{
OutputStreamWriter stream = null; //10227
stream = new OutputStreamWriter( new FileOutputStream( file ) , "ISO-8859-15");
stream.write( new String( bytes ) );
stream.flush();
stream.close();
}
}
String/char/Writer/Reader
是Java中的Unicode文本。 (這使得Java在其他語言中是唯一的。)Java文本始終可以包含腳本的任何混合。
byte[]/InputStream/OutputStream
是Java中的二進制數據。 要被解釋為文本,必須為其提供編碼。
因此,您可以執行以下操作:
OutputStreamWriter stream = null; //10227
stream = new OutputStreamWriter( new FileOutputStream(file), "ISO-8859-15");
stream.print("IL RITROVO AL 1° PIANO");
stream.close();
OuputStreamWriter類將其橋接,並將Unicode文本寫入具有該編碼的字節中。
通常,轉換為:
bytes[] inISO15 = "IL RITROVO AL 1° PIANO".getBytes("ISO-8859-15");
String s = new String(inISO15, "ISO-8859-15");
您采用了OutputStream功能來寫入字節,從而繞過了轉換。 這應該通過以下方式完成:
stream.write(inISO5015);
但是最好不要使用Writer,而應立即使用FileOutputStream或BufferedOutputStream。
謝謝,但這是我想要的,但是我無法使用CharsetDecoder。
package dummy;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
public class WrongWriter {
static File wrongFile = new File("C:/Users/utente/Desktop/wrongFile.txt");
static File rightFile = new File("C:/Users/utente/Desktop/rightFile.txt");
public static void main(String[] args) throws IOException {
byte[] wrongBytes = new byte[]{
73, 76, 32, 82, 73, 84, 82, 79, 86, 79, 32, 65, 76, 32, 49, 0, 32, 80, 73, 65, 78, 79, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32
};
if (CharacterChecker.isISO_8859_1(wrongBytes)) {
write(wrongFile, wrongBytes) ;
} else{
System.out.println("Bad input");
}
byte[] rightBytes = "IL RITROVO AL 1° PIANO".getBytes("ISO-8859-15");
write(rightFile, rightBytes) ;
}
static void write(File file, byte[] bytes) throws IOException{
OutputStreamWriter stream = null; //10227
stream = new OutputStreamWriter( new FileOutputStream( file ) , "ISO-8859-15");
stream.write( new String( bytes, "ISO-8859-15" ) );
stream.flush();
stream.close();
}
}
class CharacterChecker {
static public boolean isISO_8859_1(byte[] bytes) throws UnsupportedEncodingException{
for(int i=0;i< bytes.length;i++)
{
if(
( bytes[i]<32 && bytes[i] >=0)
|| (bytes[i]<-65 && bytes[i]>-69)
|| bytes[i]==-72
|| bytes[i]==-76
|| bytes[i]==-88
|| bytes[i]==-90
|| bytes[i]==-92
) {
return false;
}
}
return true;
}
static public boolean isISO_8859_1(String s) throws UnsupportedEncodingException{
byte[] bytes = s.getBytes("ISO-8859-1");
return isISO_8859_1(bytes);
}
static public String replaceNotISO_8859_1_characters(String s, char chracter) throws UnsupportedEncodingException{
String cString = Character.toString(chracter);
byte sobs = cString.getBytes("ISO-8859-1")[0];
byte[] bytes = s.getBytes("ISO-8859-1");
for(int i=0;i< bytes.length;i++)
{
if(
( bytes[i]<32 && bytes[i] >=0)
|| (bytes[i]<-65 && bytes[i]>-69)
|| bytes[i]==-72
|| bytes[i]==-76
|| bytes[i]==-88
|| bytes[i]==-90
|| bytes[i]==-92
) {
bytes[i] = sobs;
}
}
return new String(bytes,"ISO-8859-1");
}
}
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