ServletContext获取文件真实路径

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import java.io.FileInputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import javax.servlet.ServletContext;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;//文件下载public class ServletDemo6 extends HttpServlet {public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {//得到要下载的文件的真实路径ServletContext sc = getServletContext();String path = sc.getRealPath("/WEB-INF/1.jpg");InputStream in = new FileInputStream(path);//告知浏览器去下载response.setHeader("Content-Disposition", "attachment;filename=1.jpg");response.setHeader("Content-Type", "application/octet-stream");OutputStream out = response.getOutputStream();int len = -1;byte b[] = new byte[1024];while((len=in.read(b))!=-1){out.write(b, 0, len);}in.close();out.close();}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {doGet(request, response);}}

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