上载功能时报错 ERROR [Engine] StandardWrapperValve[jsp]: Servlet.service(

下载功能时报错 ERROR [Engine] StandardWrapperValve[jsp]: Servlet.service(
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下载功能时报错 ERROR [Engine] StandardWrapperValve[jsp]: Servlet.service() for servlet jsp threw exception

代码如下:
  //DownLoda.java
  import java.text.*;
  import java.util.*;
  import javax.servlet.*;
  import javax.servlet.http.*;
  import java.net.*;
  import Com.Fh.Xtpt.Servers.PubServers;
 
  /**
  * 实现下载功能
  */
  public class DownLoad {
 
  public void downLoad(HttpServletResponse response, String headName,
    String fileUrl) throws Exception {
 
  if (headName.endsWith(".txt")) {
  response.setContentType("text;charset=GB2312");
  response.setHeader("Content-disposition",
    "attachment; filename=" + headName);
  }
  else {
  response.setContentType("application/doc;charset=GB2312");
  response.setHeader("Content-disposition",
    "attachment; filename=" + headName);
  }
 
  String fileURL = fileUrl;
  if (fileURL == null) {
  return;
  }
 
  try {
  File file = new File(fileUrl);
  FileInputStream bis = new FileInputStream(file);
  OutputStream bos = response.getOutputStream();
 
  byte[] buff = new byte[1024];
  int readCount = 0;
  int i = 0;
  readCount = bis.read(buff);
  while (readCount != -1) {
  bos.write(buff, 0, readCount);
  readCount = bis.read(buff);
  }
 
  if (bis != null) {
  System.out.println("****** good1 ******");
  bis.close();
  System.out.println("****** good2 ******");
  }
  if (bos != null) {
  System.out.println("****** good3 ******");
  bos.close();     


我的异常网推荐解决方案:Servlet.service() for servlet default threw exception,http://www..net/eclipse/181756.html