原来中间件的temp目录也有大作用
程序员文章站
2022-07-13 10:37:22
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最近,小编在使用jcaptcha 来生成验证码时,无意间发现个问题~多方谷歌、度娘后,方知答案!!
参阅:http://blog.sina.com.cn/s/blog_5999840701009t06.html
一直用eclipse-jetty 插件在运行,没发现生成用jcaptcha验证码对temp目录的作用,直到部署到tomcat上是,无意间把tomcat-temp目录删除后,程序报
javax.imageio.IIOException: Can't create output stream! at javax.imageio.ImageIO.write(ImageIO.java:1560) at com.csair.cas.web.servlet.ImageCaptchaServlet.generateCaptchaImage(ImageCaptchaServlet.java:58) at com.csair.cas.web.servlet.ImageCaptchaServlet.doGet(ImageCaptchaServlet.java:31) 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.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88) at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76) at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346) at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:259) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at com.github.inspektr.common.web.ClientInfoThreadLocalFilter.doFilter(ClientInfoThreadLocalFilter.java:63) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) 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:852) 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:662) Caused by: javax.imageio.IIOException: Can't create cache file! at javax.imageio.ImageIO.createImageOutputStream(ImageIO.java:397) at javax.imageio.ImageIO.write(ImageIO.java:1558) ... 25 more Caused by: java.io.IOException: 系统找不到指定的路径。 at java.io.WinNTFileSystem.createFileExclusively(Native Method) at java.io.File.checkAndCreate(File.java:1704) at java.io.File.createTempFile(File.java:1792) at javax.imageio.stream.FileCacheImageOutputStream.<init>(FileCacheImageOutputStream.java:71) at com.sun.imageio.spi.OutputStreamImageOutputStreamSpi.createOutputStreamInstance(OutputStreamImageOutputStreamSpi.java:50) at javax.imageio.ImageIO.createImageOutputStream(ImageIO.java:393) ... 26 more
在调用jcaptcha的servlet里,这个方法
ImageIO.write(image, "jpeg", response.getOutputStream());
需要写缓存文件....估计使用jcaptcha 生产验证码时需要用到temp目录,但是却又不往里写数据...奇怪吧~~
吸取教训~~原来每个中间件的temp目录是有可能有作用~~切记勿删除哈~~~