將EBCDIC字符串轉換爲ASCII格式？

Question

我有一個從Db2表中拉出的平面文件，平面文件包含char格式以及壓縮十進制格式的記錄。如何將打包數據轉換爲java string.is有任何轉換方法整個平面文件轉換爲ASCII格式。

Answer 1

以字符串形式讀取文件，將其寫爲EBCDIC。使用OutputStreamWriter和InputStreamWriter並在構造函數中給出編碼。

Answer 2

EBCDIC是一組編碼。您需要詳細瞭解您的EBCDIC編碼細節。

Java有一個號碼的supported encodings，包括：

• IBM500/CP500 - EBCDIC 500V1
• 的x IBM834/Cp834 - IBM EBCDIC DBCS-僅韓語（雙字節）
• IBM1047/Cp1047 - 用於EBCDIC主機的Latin-1字符集

試試這些，看看你得到了什麼。例如：

InputStreamReader rdr = new InputStreamReader(new FileInputStream(<your file>), java.nio.Charset.forName("ibm500")); 
    while((String line = rdr.readLine()) != null) { 
     System.out.println(line); 
} 

Answer 3

從PAP之後，CP037是US EBCDIC編碼。

也看看JRecord項目。它允許您使用Cobol或Xml描述讀取文件，並處理EBCDIC和Comp-3。

最後這裏是壓縮十進制字節轉換爲字符串見方法getMainframePackedDecimal在Conversion

Answer 4

由我供你參考共享樣本代碼的程序：

package mypackage; 
    import java.io.UnsupportedEncodingException; 
    import java.math.BigInteger; 
    public class EtoA { 

public static void main(String[] args) throws UnsupportedEncodingException { 

    System.out.println("########"); 
    String edata = "/ÂÄÀ"; //Some EBCDIC string ==> here the OP can provide the content of flat file which the OP pulled from DB2 table 
    System.out.println("ebcdic source to ascii:"); 
    System.out.println("ebcdic: " + edata); 
    String ebcdic_encoding = "IBM-1047"; //Setting the encoding in which the source was encoded 
    byte[] result = edata.getBytes(ebcdic_encoding); //Getting the raw bytes of the EBCDIC string by mentioning its encoding 
    String output = asHex(result); //Converting the raw bytes into hexadecimal format 
    byte[] b = new BigInteger(output, 16).toByteArray(); //Now its easy to convert it into another byte array (mentioning that this is of base16 since it is hexadecimal) 
    String ascii = new String(b, "ISO-8859-1"); //Now convert the modified byte array to normal ASCII string using its encoding "ISO-8859-1" 
    System.out.println("ascii: " + ascii); //This is the ASCII string which we can use universally in JAVA or wherever 

    //Inter conversions of similar type (ASCII to EBCDIC) are given below: 
    System.out.println("########"); 
    String adata = "abcd"; 
    System.out.println("ascii source to ebcdic:"); 
    System.out.println("ascii: " + adata); 
    String ascii_encoding = "ISO-8859-1"; 
    byte[] res = adata.getBytes(ascii_encoding); 
    String out = asHex(res); 
    byte[] bytebuff = new BigInteger(out, 16).toByteArray(); 
    String ebcdic = new String(bytebuff, "IBM-1047"); 
    System.out.println("ebcdic: " + ebcdic); 

    //Converting from hexadecimal string to EBCDIC if needed 
    System.out.println("########"); 
    System.out.println("hexcode to ebcdic"); 
    String hexinput = "81828384"; //Hexadecimal which we are converting to EBCDIC 
    System.out.println("hexinput: " + hexinput); 
    byte[] buffer = new BigInteger(hexinput, 16).toByteArray(); 
    String eout = new String(buffer, "IBM-1047"); 
    System.out.println("ebcdic out:" + eout); 

    //Converting from hexadecimal string to ASCII if needed 
    System.out.println("########"); 
    System.out.println("hexcode to ascii"); 
    String hexin = "61626364"; 
    System.out.println("hexin: " + hexin); 
    byte[] buff = new BigInteger(hexin, 16).toByteArray(); 
    String asciiout = new String(buff, "ISO-8859-1"); 
    System.out.println("ascii out:" + asciiout); 
} 

//This asHex method converts the given byte array to a String of Hexadecimal equivalent 
public static String asHex(byte[] buf) { 
    char[] HEX_CHARS = "abcdef".toCharArray(); 
    char[] chars = new char[2 * buf.length]; 
    for (int i = 0; i < buf.length; ++i) { 
     chars[2 * i] = HEX_CHARS[(buf[i] & 0xF0) >>> 4]; 
     chars[2 * i + 1] = HEX_CHARS[buf[i] & 0x0F]; 
    } 
    return new String(chars); 
} 
}