org.dom4j.DocumentException: Error on line 1 of document : 前言中不允許有內容。
我收到的應答報文：
00000827<?xml version="1.0" encoding="UTF-8"?><transaction>
<header>
<ver>1.0</ver>
<msg>
<rcvAppCd>UCP</rcvAppCd>
<callTyp>SYN</callTyp>
<msgCd>WWWK.00066661.01</msgCd>
<refSndAppCd>UCP</refSndAppCd>
<refSndDt>20220506</refSndDt>
<replyToQ>REP.TCP.GWIN</replyToQ>
<seqNb>24718917283998</seqNb>
<refMsgCd>WWWK.00066660.01</refMsgCd>
<sndTm>161158</sndTm>
<sndDt>20220506</sndDt>
<sndAppCd>WWWK</sndAppCd>
<refSeqNb>2471835137</refSeqNb>
</msg>
<status>
<desc>success</desc>
<appCd>WWWK</appCd>
<retCd>000000</retCd>
</status>
</header>
<body>
<response>
<studentId>1</studentId>
<studentName>aoligei</studentName>
<studentSex>men</studentSex>
<studentAge>15</studentAge>
</response>
</body>
</transaction>
應答報文前面有個8位的報文長度的字串，把這個去掉就可以了