javaweb 通过context向网页返回图片

比眉伴天荒 2023-06-19 14:28 25阅读 0赞

package com.my.servlet;
    
    import java.io.IOException;
    import java.io.InputStream;
    
    import javax.servlet.ServletContext;
    import javax.servlet.ServletException;
    import javax.servlet.ServletOutputStream;
    import javax.servlet.annotation.WebServlet;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    /**
     * Servlet implementation class OutputStreamServlet
     */
    @WebServlet("/OutputStreamServlet")
    public class OutputStreamServlet extends HttpServlet {
    	private static final long serialVersionUID = 1L;
           
        /**
         * @see HttpServlet#HttpServlet()
         */
        public OutputStreamServlet() {
            super();
            // TODO Auto-generated constructor stub
        }
    
    	/**
    	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
    	 */
    	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    		response.setContentType("image/jpeg");
    		ServletContext context = getServletContext();
    		InputStream is = context.getResourceAsStream("images/u.jpg");
    		ServletOutputStream os = response.getOutputStream();
    		int i=0;
    		while((i=is.read())!=-1) {
    			os.write(i);
    		}
    		is.close();
    		os.close();
    	}
    
    	/**
    	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
    	 */
    	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    		// TODO Auto-generated method stub
    		doGet(request, response);
    	}
    
    }