java调用Dll文件中的函数出错

Question

java.lang.UnsatisfiedLinkError: cn.com.wudi.common.util.JiamiJNICore.b64_des([B[B[BJC)[B
at cn.com.wudi.common.util.JiamiJNICore.b64_des(Native Method)
at cn.com.wudi.common.util.JiamiJNI.b64_des(JiamiJNI.java:22)
at cn.com.wudi.tax.daoImpl.CodeDAOImpl.export(CodeDAOImpl.java:258)
at cn.com.wudi.tax.daoImpl.CodeDAOImpl$$EnhancerByCGLIB$$983e601b_2.export(<generated>)
at cn.com.wudi.tax.action.ExportDMinfoAction.execute(ExportDMinfoAction.java:56)
at org.springframework.web.struts.DelegatingActionProxy.execute(DelegatingActionProxy.java:105)
at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:484)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:274)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:525)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:75)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:174)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:151)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:874)
at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)
at java.lang.Thread.run(Thread.java:619)

Answer 1

java.lang.UnsatisfiedLinkError: cn.com.wudi.common.util.JiamiJNICore.b64_des([B[B[BJC)[B JVM认为没有找到b64_des(byte[], byte[]...)这个方法
可能是你的DLL定义参数类型、个数不一样

Answer 2

public   native byte[] b64_des(byte[] szin,byte[] szout,byte[]key,long inlen,char flag);这是我在java中写的方法..

Answer 3

b64_des（ref string szin,ref string szout,string key,int inlen
,uint flag）这是VC写的函数,我也不大懂。 

Answer 4

你的函数参数定义是错误的。你必须使用javah来生成.h文件，并用.h文件中所声明的参数类型！
javah -classpath ...   cn.com.wudi.common.util.JiamiJNICore 这样生成.h文件时JiamiJNICore最好先暂时屏蔽loadLibrary这句，否则javah有时候会出错的