[英]Servlet java, server side, send a string as a new txt file
我有一個Java Web應用程序。 用戶能夠上傳文件(通過POST請求),然后servlet將對該文件執行一些代碼。 此代碼的輸出是字符串。
如何在不創建文件的情況下將文件返回給用戶? 那可能嗎?
是的,您必須設置內容處置頭,然后將流寫入響應。
嘗試使用該代碼
package com.hainasoft.web;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class DownloadServlet extends javax.servlet.http.HttpServlet implements
javax.servlet.Servlet {
static final long serialVersionUID = 1L;
private static final int BUFSIZE = 4096;
private String filePath;
public void init() {
// the file data.xls is under web application folder
filePath = getServletContext().getRealPath("") + File.separator + "data.xls";
}
protected void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
File file = new File(filePath);
int length = 0;
ServletOutputStream outStream = response.getOutputStream();
ServletContext context = getServletConfig().getServletContext();
String mimetype = context.getMimeType(filePath);
// sets response content type
if (mimetype == null) {
mimetype = "application/octet-stream";
}
response.setContentType(mimetype);
response.setContentLength((int)file.length());
String fileName = (new File(filePath)).getName();
// sets HTTP header
response.setHeader("Content-Disposition", "attachment; filename=\"" + fileName + "\"");
byte[] byteBuffer = new byte[BUFSIZE];
DataInputStream in = new DataInputStream(new FileInputStream(file));
// reads the file's bytes and writes them to the response stream
while ((in != null) && ((length = in.read(byteBuffer)) != -1))
{
outStream.write(byteBuffer,0,length);
}
in.close();
outStream.close();
}
}
設置myme類型很重要
mimetype = "application/octet-stream";
並以此為用戶設置一個下載對話框
response.setHeader("Content-Disposition", "attachment; filename=\"" + fileName + "\"");
我已經從http://www.java-forums.org/blogs/servlet/668-how-write-servlet-sends-file-user-download.html中檢索了所有這些信息
因此,請查看它以獲得更准確的信息。
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