Servlet 之文件下载
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.FileInputStream;
import java.io.IOException;
import java.net.URLEncoder;
public class FileDownload extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String filePath = "文件路径";
//通过文件路径获取文件名
String fileName = filePath.substring(filePath.lastIndexOf("\\"));
resp.setHeader("Content-Disposition","attachment;filename=" + URLEncoder.encode(fileName,"utf-8"));
FileInputStream in = new FileInputStream(filePath);
int len;
//字节数组的大小随各人习惯设置；也可以设置为 in.available() ，如此缓冲区大小刚好，不必再循环读取了
byte[] bytes = new byte[8];
ServletOutputStream out = resp.getOutputStream();
while((len = in.read(bytes)) != -1) {
out.write(bytes,0,len);
}
out.flush();
out.close();
in.close();
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doGet(req, resp);
}
}
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