我有一个从Db2表中提取的平面文件,平面文件包含char格式的记录以及压缩十进制格式。将打包数据转换为java字符串。有没有办法转换整个平面文件到ASCII格式。
EBCDIC is a family of encodings. You'll need to know more in details which EBCDIC encoding you're after.
Java has a number of supported encodings , including:
Try those and see what you get. Something like:
InputStreamReader rdr = new InputStreamReader(new FileInputStream(<your file>), java.nio.Charset.forName("ibm500"));
while((String line = rdr.readLine()) != null) {
System.out.println(line);
}
Following from PAP, CP037 is US EBCDIC encoding.
Also have a look at JRecord Project. It allows you to read a file with either a Cobol or Xml description and will handle EBCDIC and Comp-3.
Finally here is a routine to convert packed decimal bytes to String see method getMainframePackedDecimal in Conversion
Read the file as a String, write it as EBCDIC. Use the OutputStreamWriter and InputStreamWriter and give the encoding in the constructor.
Sharing a sample code by me for your reference:
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 = "0123456789abcdef".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);
}
}
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