私はこのアクションクラスを持っています、このクラスは私の応答を処理します
更新DownloadStatus
クラスからの応答を渡すようになりましたが、nullのようです
public final class DownloadStatus extends ActionSupport implements ServletRequestAware,ServletResponseAware
{
static Logger logger = Logger.getLogger(DownloadStatus.class);
private HttpServletRequest request;
private HttpServletResponse response;
private File cfile;
private String cfileFileName;
@Override
public String execute()
{
logger.debug("Inside DownloadStatus.execute method")
try {
ChainsInvoker invoker = new ChainsInvoker()
def executionResponse = invoker.invoke(request, MYChains.download, cfile, cfileFileName)
if(executionResponse == null || ErrorHandler.checkIfError(executionResponse))
{
return ERROR
}
response.setContentType("APPLICATION/xml")
logger.debug("filename: $cfileFileName")
response.addHeader("Content-Disposition", "attachment; filename=\""+cfileFileName+"\"")
response.getWriter().print(executionResponse)
logger.debug("executionResponse :" + executionResponse)
invoker.invoke(MYChains.clean)
}catch (Exception exp) {
logger.error("Exception while Creating Status ")
logger.error(exp.printStackTrace())
}
return NONE
}
@Override
public void setServletRequest(HttpServletRequest request) { this.request = request; }
@Override
public void setServletResponse(HttpServletResponse response) { this.response = response; }
public File getcfile() { cfile }
public void setcfile(File cfile) { this.cfile = cfile }
public String getcfileFileName() { cfileFileName }
public void setcfileFileName(String cfileFileName){ this.cfileFileName = cfileFileName }
}
ストリームを応答に書き込むクラスの下
class DownloadStatusResponse implements Command {
static Logger logger = Logger.getLogger(DownloadStatusResponse.class);
@Override
public boolean execute(Context ctx) throws Exception
{
logger.debug("Inside DownloadStatusResponse.execute() method")
OutputStream response = null;
if(ctx.get(ContextParams.absFileName) != null && ctx.get(ContextParams.absFileName).toString().trim().length() != 0 )
{
HttpServletResponse resp = ctx.get(ContextParams.response)
/*I am trying to get Response here*/
response=downloadStatusFile(ctx.get(ContextParams.absFileName).toString(),resp)
}
logger.debug("Response: " + response)
ctx.put(ContextParams.response,response); /*ContextParams is a enum of keywords, having response*/
return false;
}
private OutputStream downloadStatusFile(String filename,HttpServletResponse resp)
{
logger.info("Inside downloadStatusFile() method")
File fname = new File(filename)
if(!fname.exists())
{
logger.info("$filename does not exists")
return null
}
else
{
resp.setContentType("APPLICATION/xml")
/*Exception: cannot setContentType on null object*/
resp.addHeader("Content-Disposition", "attachment; filename=\""+fname.getName()+"\"")
FileInputStream istr = new FileInputStream(fname)
OutputStream ostr = resp.getOutputStream()
/*I need to use resp.getOutputStream() for ostr*/
int curByte=-1;
while( (curByte=istr.read()) !=-1)
ostr.write(curByte)
ostr.flush();
}
return ostr
}
}
私の質問は、ostr
をresponse
クラスのDownloadStatus
に戻すにはどうすればよいですか?
更新(動作テストサーブレット)
ファイルコンテンツをストリームに取得してHttpServletResponseに返すジョブを実行する以下のサーブレットがありますが、上記のコードで使用したいと思います。
public class DownloadServlet extends HttpServlet {
public void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
String fileName = req.getParameter("zipFile");
if(fileName == null) return;
File fname = new File(fileName);
System.out.println("filename");
if(!fname.exists()) {System.out.println("Does not exists"); return;}
FileInputStream istr = null;
OutputStream ostr = null;
//resp.setContentType("application/x-download");
resp.setContentType("APPLICATION/Zip");
resp.addHeader("Content-Disposition", "attachment; filename=\""+fname.getName()+"\"");
System.out.println(fname.getName());
try {
istr = new FileInputStream(fname);
ostr = resp.getOutputStream();
int curByte=-1;
while( (curByte=istr.read()) !=-1)
ostr.write(curByte);
ostr.flush();
} catch(Exception ex){
ex.printStackTrace(System.out);
} finally{
try {
if(istr!=null) istr.close();
if(ostr!=null) ostr.close();
} catch(Exception ex){
ex.printStackTrace();
System.out.println(ex.getMessage());
}
}
try {
resp.flushBuffer();
} catch(Exception ex){
ex.printStackTrace();
System.out.println(ex.getMessage());
}
}
}
私が理解している限り、必要なのはStruts2を使用してファイルをダウンロードする方法だけです。
あなたはこのようなものがあなたのstruts.xmlファイルである必要があります
<action name="downloadfile" class="DownloadAction">
<result name="success" type="stream">
<param name="contentType">application/pdf</param>
<param name="inputName">inputStream</param>
<param name="contentDisposition">attachment;filename="document.pdf"</param>
<param name="bufferSize">1024</param>
</result>
</action>
コード:
public class DownloadAction extends ActionSupport {
private InputStream inputStream;
public InputStream getInputStream() {
return inputStream;
}
public void setInputStream(InputStream inputStream) {
this.inputStream = inputStream;
}
public String execute() throws FileNotFoundException {
String filePath = ServletActionContext.getServletContext().getRealPath("/uploads");
File f = new File(filePath + "/nn.pdf");
System.out.println(f.exists());
inputStream = new FileInputStream(f);
return SUCCESS;
}
}