我是新的发展与iso 8583，我需要添加一个标头前的iso消息。但我用这种方式实现它们，并且不将其添加到消息头中。我做错了什么？我希望你能帮助我。

GenericPackager packager = new GenericPackager("tes1.xml");

            // Create a new ISOMsg object using the custom packager
            ISOMsg isoMsg = new ISOMsg();
            isoMsg.setPackager(packager);
                isoMsg.setHeader("ISO008000099".getBytes());
            isoMsg.setMTI("0800");
            isoMsg.set(7, "1011110140");
            isoMsg.set(11, "047478");
            isoMsg.set(70, "401");
            
            
            ASCIIChannel c = new ASCIIChannel("localhost", 6000, packager);
            c.connect();
            c.send(isoMsg);
            System.out.println("ISO message : " + new String(isoMsg.pack()));
            //System.out.println(new String(isoMsg.pack()));

当显示要发送的iso消息时，不观察报头

0000  30 38 30 30 38 32 32 30  30 30 30 30 30 30 30 30  0800822000000000
0010  30 30 30 30 30 34 30 30  30 30 30 30 30 30 30 30  0000040000000000
0020  30 30 30 30 31 30 31 31  31 31 30 31 34 30 30 34  0000101111014004
0030  37 34 37 38 34 30 31                              7478401

已发送消息：0800822000000000000004000000000000001011110140047478401
该信息应按如下方式发送：ISO00800009908008220000000000000004000000000000001011110140047478401
我正在使用以下配置：

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE isopackager SYSTEM "genericpackager3.dtd">

<!-- ISO 8583:1987 (ASCII) field descriptions for GenericPackager -->

<isopackager>

  <header length="12" value =""></header>
<isofield
      id="0"
      length="4"
      name="MESSAGE TYPE INDICATOR"
      class="org.jpos.iso.IFA_NUMERIC"/>
  <isofield
      id="1"
      length="16"
      name="BIT MAP"
      class="org.jpos.iso.IFA_BITMAP"/>
  <isofield
      id="2"
      length="21"
      name="PAN - PRIMARY ACCOUNT NUMBER"
      class="org.jpos.iso.IFA_LLNUM"/>
  <isofield
      id="3"
      length="6"
      name="PROCESSING CODE"
      class="org.jpos.iso.IFA_NUMERIC"/>
  <isofield
      id="4"
      length="12"
      name="AMOUNT, TRANSACTION"
      class="org.jpos.iso.IFA_NUMERIC"/>

和.dtd的配置：

<?xml version="1.0" encoding="UTF-8"?>

<!ELEMENT isopackager (header?,isofield*,isofieldpackager*)>
<!ELEMENT header (#PCDATA)>
<!ATTLIST header
    length CDATA #REQUIRED
    value  CDATA #REQUIRED>

<!ATTLIST isopackager maxValidField     CDATA        #IMPLIED>
<!ATTLIST isopackager bitmapField       CDATA        #IMPLIED>
<!ATTLIST isopackager thirdBitmapField  CDATA        #IMPLIED>
<!ATTLIST isopackager firstField        CDATA        #IMPLIED>
<!ATTLIST isopackager emitBitmap        (true|false) #IMPLIED>
<!ATTLIST isopackager headerLength      CDATA        #IMPLIED>

<!-- isofield -->
<!ELEMENT isofield (#PCDATA)>
<!ATTLIST isofield id     CDATA        #REQUIRED>
<!ATTLIST isofield length CDATA        #REQUIRED>
<!ATTLIST isofield name   CDATA        #REQUIRED>
<!ATTLIST isofield class  NMTOKEN      #REQUIRED>
<!ATTLIST isofield params CDATA        #IMPLIED>
<!ATTLIST isofield encoding CDATA      #IMPLIED>
<!ATTLIST isofield token  CDATA        #IMPLIED>
<!ATTLIST isofield pad    (true|false) #IMPLIED>
<!ATTLIST isofield trim (true|false) #IMPLIED>

<!-- isofieldpackager -->
<!ELEMENT isofieldpackager (isofield*,isofieldpackager*)*>
<!ATTLIST isofieldpackager id       CDATA        #REQUIRED>
<!ATTLIST isofieldpackager name     CDATA        #REQUIRED>
<!ATTLIST isofieldpackager length   CDATA        #REQUIRED>
<!ATTLIST isofieldpackager class    NMTOKEN      #REQUIRED>
<!ATTLIST isofieldpackager params   CDATA        #IMPLIED>
<!ATTLIST isofieldpackager token    CDATA        #IMPLIED>
<!ATTLIST isofieldpackager pad      (true|false) #IMPLIED>
<!ATTLIST isofieldpackager packager NMTOKEN      #REQUIRED>
<!ATTLIST isofieldpackager emitBitmap (true|false) #IMPLIED>
<!ATTLIST isofieldpackager maxValidField CDATA        #IMPLIED>
<!ATTLIST isofieldpackager bitmapField CDATA        #IMPLIED>
<!ATTLIST isofieldpackager firstField  CDATA        #IMPLIED>
<!ATTLIST isofieldpackager headerLength  CDATA        #IMPLIED>
<!ATTLIST isofieldpackager tagMapper     CDATA        #IMPLIED>
<!ATTLIST isofieldpackager tagSize       CDATA        #IMPLIED>
<!ATTLIST isofieldpackager lenSize       CDATA        #IMPLIED>
<!ATTLIST isofieldpackager swapTagAndLen (true|false) #IMPLIED>

在消息中发送的字段：

<isomsg direction="outgoing">
  <!-- org.jpos.iso.packager.GenericPackager[tes1.xml] -->
  <header>49534F303038303030303939</header>
  <field id="0" value="0800"/>
  <field id="7" value="1011110140"/>
  <field id="11" value="047478"/>
  <field id="70" value="401"/>
</isomsg>