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最新推荐文章于 2024-09-27 16:45:26 发布

原创最新推荐文章于 2024-09-27 16:45:26 发布 · 511 阅读

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文章标签：

#string #file #exception #function #null #byte

java - BIO/NIO/AIO 专栏收录该内容

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本文介绍了一个具体的文件下载Action实现过程，包括从系统参数中获取导出路径、设置响应头、读取文件并将其内容输出到客户端等关键步骤。同时提供了两种不同的实现方式，一种使用FileInputStream，另一种使用BufferedReader。

  public ActionForward openFile(
  ActionMapping mapping,
  ActionForm form,
  HttpServletRequest request,
  HttpServletResponse response)
  throws IOException, ServletException
{
  System.err.println("===com.eastpro.batch.action.BankBillingAction.openFile===begin===");

String fileName=request.getParameter("fileName");
String filePath="";

  try{
   response.setContentType("text/plain; charset=UTF-8");
   response.setHeader("Cache-Control", "no-cache");
   response.setHeader("Charset", "UTF-8");

   Function ff = new Function();
   Collection sys_result = ff.getSysParam();
   Data sys_data = (Data) sys_result.iterator().next();
   String exportPath = sys_data.getVcharProperty("export_path").trim();
   sys_data = null;
   sys_result = null;
   ff = null;
   filePath=exportPath+fileName;
   OutputStream out=response.getOutputStream();
   File file=new File(filePath);
   InputStream is = new FileInputStream(file);
   byte temp[] = new byte[100 * 1024];
   int i=0;
   while((i=is.read(temp))!=-1){
    out.write(temp, 0, i);
   }
   out.flush();
   out.close();
   out=null;

  }catch (Exception e){
   System.err.println("Error: com.eastpro.batch.action.BankBillingAction.openFile()");
   e.printStackTrace();
  }
  System.err.println("===com.eastpro.batch.action.BankBillingAction.openFile===end===");

return null;
}

public ActionForward openFileOri(
  ActionMapping mapping,
  ActionForm form,
  HttpServletRequest request,
  HttpServletResponse response)
  throws IOException, ServletException
{
  System.err.println("===com.eastpro.batch.action.BankBillingAction.openFile===begin===");

String fileName=request.getParameter("fileName");
String filePath="";

  try{

   response.setContentType("text/plain; charset=UTF-8");
   response.setHeader("Cache-Control", "no-cache");
   response.setHeader("Charset", "UTF-8");

   Function ff = new Function();
   Collection sys_result = ff.getSysParam();
   Data sys_data = (Data) sys_result.iterator().next();
   String exportPath = sys_data.getVcharProperty("export_path").trim();
   sys_data = null;
   sys_result = null;
   ff = null;
   filePath=exportPath+fileName;
   OutputStream out=response.getOutputStream();

   File file=new File(filePath);
   BufferedReader in=new BufferedReader(new FileReader(file));
   String strLine="";
   byte temp[] = new byte[100 * 1024];
   while((strLine=in.readLine())!=null){
    temp=strLine.getBytes();
    out.write(temp, 0, temp.length);
   }
   out.flush();
   out.close();
   out=null;

  }catch (Exception e){
   System.err.println("Error: com.eastpro.batch.action.BankBillingAction.openFile()");
   e.printStackTrace();
  }
  System.err.println("===com.eastpro.batch.action.BankBillingAction.openFile===end===");

return null;
}