求请教tomcat为什么不能调用org.apache.commons.codec.binary.Base64

[xcfdszzr]

严重: Servlet.service() for servlet formServlet threw exception
java.lang.ClassNotFoundException: org.apache.commons.codec.binary.Base64
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1645)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1491)
at com.shu.edu.servletjsp.MD5.md5(MD5.java:22)
at com.shu.edu.servletjsp.formServlet.doGet(formServlet.java:16)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:857)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:745)

[LinY_X]

有导入这个包么commons-codec-1.3.jar

[S117]

去下载最新的commons-codec jar包，然后放到你项目的lib目录里！

[etnet]

java.lang.ClassNotFoundException: org.apache.commons.codec.binary.Base64 这句你不看的吗?英文有差到这种程度吗?告诉你找不到这个类文件还能是什么问题?