大家帮帮我啊,weblogic上报错java.lang.ClassCastException

最新推荐文章于 2024-05-27 22:30:03 发布

原创最新推荐文章于 2024-05-27 22:30:03 发布 · 1.6k 阅读

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CC 4.0 BY-SA版权

文章标签：

#weblogic #byte #buffer #null #file #string

本文介绍了一个在WebLogic服务器上处理BLOB数据导出的问题及解决方案。作者尝试从数据库中读取BLOB数据并将其写入文件，在Tomcat上运行正常但在WebLogic上遇到ClassCastException错误。通过分析堆栈跟踪，可以找到解决此跨平台问题的方法。

各位大哥大姐帮帮我啊,谢谢了

String fvd_id = request.getParameter("fvd_id");
     System.out.println(fvd_id);
      InputStream in = null; // 建立输入流
      ResultSet rs = null;
      BLOB blob = null;
      java.io.ByteArrayOutputStream outs = null;
      String filename = "";
     long size = 0;
     FileConfigs filecon = FileConfigs.getInstance();
     CommonModel cm = DBUtil.getArchDBModel(filecon.getDBType(),filecon.getDBURL(),filecon.getDBUSER(),filecon.getDBPASSWD());
      rs=cm.querySQL("select FORMATAFFIX from IssueContent where fvd_id='"+fvd_id+"'");
     while(rs.next()){
         blob = (BLOB) rs.getBlob("FORMATAFFIX");
         size = blob.length();
         System.out.println(size+"00000000000000000000");
          int bsize = blob.getBufferSize();
          byte[] buffer = new byte[bsize]; // 建立缓冲区
          in = blob.getBinaryStream();
          outs = new java.io.ByteArrayOutputStream();
          int nk = 0;
          while ( (nk = in.read(buffer)) != -1) {
            outs.write(buffer, 0, nk);
          }
          byte[] databytes = outs.toByteArray();
         InputStream ins = blob.getBinaryStream();
          File file = new File("c://WINDOWS//COOATemplate//Printfile.ceb");
          OutputStream fout = new FileOutputStream(file);
          //下面将BLOB数据写入文件
          byte[] b = new byte[blob.getBufferSize()];
          int len = 0;
          while ( (len = ins.read(b)) != -1) {
          fout.write(b, 0, len);
        }
        fout.close();
        ins.close();
                }

tomcat 上运行没问题,weblogic上报下面的错误:

Error 500--Internal Server Error
java.lang.ClassCastException
at jsp_servlet._issue.__trans_ceb._jspService(__trans_ceb.java:209)
at weblogic.servlet.jsp.JspBase.service(JspBase.java:33)
at weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run(ServletStubImpl.java:1053)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:387)
at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:28)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)
at com.bstek.dorado.core.FilterHandle.c(Unknown Source)
at com.bstek.dorado.core.FilterHandle.doFilter(Unknown Source)
at com.bstek.dorado.core.DoradoFilter.doFilter(Unknown Source)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:6316)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:317)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:118)
at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:3622)
at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2569)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:197)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:170)