Java如何打包ISO 8583消息？
下面的代码段显示了如何打包ISO8583消息。
package org.nhooo.example.jpos;
import org.jpos.iso.ISOException;
import org.jpos.iso.ISOMsg;
import org.jpos.iso.packager.GenericPackager;
import java.io.InputStream;
public class PackISOMessage {
public static void main(String[] args) {
PackISOMessage iso = new PackISOMessage();
try {
String message = iso.buildISOMessage();
System.out.printf("Message = %s", message);
} catch (Exception e) {
e.printStackTrace();
}
}
private String buildISOMessage() throws Exception {
try {
//从资源目录加载程序包。
InputStream is = getClass().getResourceAsStream("/fields.xml");
GenericPackager packager = new GenericPackager(is);
ISOMsg isoMsg = new ISOMsg();
isoMsg.setPackager(packager);
isoMsg.setMTI("0200");
isoMsg.set(3, "000010");
isoMsg.set(4, "1500");
isoMsg.set(7, "1206041200");
isoMsg.set(11, "000001");
isoMsg.set(41, "12340001");
isoMsg.set(49, "840");
printISOMessage(isoMsg);
byte[] result = isoMsg.pack();
return new String(result);
} catch (ISOException e) {
throw new Exception(e);
}
}
private void printISOMessage(ISOMsg isoMsg) {
try {
System.out.printf("MTI = %s%n", isoMsg.getMTI());
for (int i = 1; i <= isoMsg.getMaxField(); i++) {
if (isoMsg.hasField(i)) {
System.out.printf("Field (%s) = %s%n", i, isoMsg.getString(i));
}
}
} catch (ISOException e) {
e.printStackTrace();
}
}
}运行该程序时，将获得以下输出：
MTI = 0200 Field (3) = 000010 Field (4) = 1500 Field (7) = 1206041200 Field (11) = 000001 Field (41) = 12340001 Field (49) = 840 Message = 02003220000000808000000010000000001500120604120000000112340001840
fields.xml可以从以下链接下载xml打包程序（）：fields.xml。
Maven依赖
<!-- https://search.maven.org/remotecontent?filepath=org/jpos/jpos/2.1.3/jpos-2.1.3.jar --> <dependency> <groupId>org.jpos</groupId> <artifactId>jpos</artifactId> <version>2.1.3</version> </dependency>