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我在执行将图像字符串转换为.png文件的非常简单的任务时遇到了错误。将图像字符串转换为java中的png文件时出错
byte[] imgByteArray = Base64.decodeBase64(imageData.getBytes());
凡的imageData包含一个长字符串表示的图像,并没有什么错在该字符串(我通过把在一个网站,即转换成PNG检查它)。
但是,执行该行时会抛出一个错误,说。文件名:jasonreq.java
Sep 01, 2014 12:37:44 AM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet jasonreq threw exception
java.lang.ClassNotFoundException: org.apache.commons.codec.binary.Base64
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1387)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1233)
at com.example.fullscreensignature.jasonreq.doPost(jasonreq.java:45)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
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:128)
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:293)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:849)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:454)
at java.lang.Thread.run(Thread.java:745)
请告诉我这个运行时错误背后的原因。 谢谢
非常感谢。有用! – 2014-08-31 20:27:20