Servlet实现将图片写入到网页和实现图片下载的功能

package donghongyujava.servlet;import java.io.File;public class ShowImage extends HttpServlet {/** * Constructor of the object. */public ShowImage() {super();}/** * Destruction of the servlet. <br> */public void destroy() {super.destroy(); // Just puts "destroy" string in log// Put your code here}public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {//showImage(request, response);downlodeImage(request, response);}public void showImage(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {// 读取方式// response.setContentType("application/zip");response.setContentType("image/jpeg");// 获取图片绝对路径String path = this.getServletContext().getRealPath("/");File file = new File(path + "/images/WIN_20131027_214421.JPG");// 创建文件输入流FileInputStream is = new FileInputStream(file);// 响应输出流ServletOutputStream out = response.getOutputStream();// 创建缓冲区byte[] buffer = new byte[1024];int len = 0;while ((len = is.read(buffer)) != -1) {out.write(buffer, 0, len);}is.close();out.flush();out.close();}public void downlodeImage(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {// 获取图片绝对路径String path = this.getServletContext().getRealPath("/");File file = new File(path + "/images/WIN_20131027_214421.JPG");//设置头信息,内容处理的方式,attachment以附件的形式打开,就是进行下载,并设置下载文件的命名response.setHeader("Content-Disposition","attachment;filename="+file.getName());// 创建文件输入流FileInputStream is = new FileInputStream(file);// 响应输出流ServletOutputStream out = response.getOutputStream();// 创建缓冲区byte[] buffer = new byte[1024];int len = 0;while ((len = is.read(buffer)) != -1) {out.write(buffer, 0, len);}is.close();out.flush();out.close();}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {this.doGet(request, response);}}