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package web.servlet.file;
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import com.sun.image.codec.jpeg.JPEGCodec;
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import com.sun.image.codec.jpeg.JPEGImageDecoder;
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import com.sun.image.codec.jpeg.JPEGImageEncoder;
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import domain.Photo;
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import domain.Student;
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import domain.Teacher;
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import service.PhotoService;
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import service.impl.PhotoServiceImpl;
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import javax.servlet.ServletContext;
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import javax.servlet.ServletException;
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import javax.servlet.annotation.WebServlet;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import javax.servlet.http.HttpSession;
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import java.awt.image.BufferedImage;
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import java.io.*;
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import java.net.ServerSocket;
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@WebServlet("/showPhotoServlet")
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public class ShowPhotoServlet extends HttpServlet {
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private static final String GIF = "image/gif;charset=GB2312";// 设定输出的类型
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private static final String JPG = "image/jpeg;charset=GB2312";
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protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
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String spec = request.getParameter("spec");// 输出图片的类型的标志
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request.setCharacterEncoding("utf-8");
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HttpSession session = request.getSession();
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Student student = (Student) session.getAttribute("student");
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Teacher teacher = (Teacher) session.getAttribute("teacher");
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Photo p;
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if (student != null) {
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PhotoService service = new PhotoServiceImpl();
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p = service.findPhotoByPhotoId(student.getS_id());
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}else{
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PhotoService service = new PhotoServiceImpl();
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p = service.findPhotoByPhotoId(teacher.getT_id());
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}
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String imagePath = "";
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if (p == null) {
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imagePath = this.getServletContext().getRealPath("/photos/") + "0.jpg";
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System.out.println(imagePath);
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} else {
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String photoName = p.getPhotoName();
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imagePath = this.getServletContext().getRealPath("/photos/") + photoName;
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System.out.println(imagePath);
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}
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response.reset();
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OutputStream output = response.getOutputStream();// 得到输出流
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if (imagePath.toLowerCase().endsWith(".jpg"))// 使用编码处理文件流的情况：
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{
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response.setContentType(JPG);// 设定输出的类型
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// 得到图片的真实路径
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// 得到图片的文件流
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InputStream imageIn = new FileInputStream(new File(imagePath));
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// 得到输入的编码器，将文件流进行jpg格式编码
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JPEGImageDecoder decoder = JPEGCodec.createJPEGDecoder(imageIn);
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// 得到编码后的图片对象
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BufferedImage image = decoder.decodeAsBufferedImage();
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// 得到输出的编码器
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JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(output);
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encoder.encode(image);// 对图片进行输出编码
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imageIn.close();// 关闭文件流
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}
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if (imagePath.toLowerCase().endsWith(".gif"))// 不使用编码处理文件流的情况：
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{
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response.setContentType(GIF);
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ServletContext context = getServletContext();// 得到背景对象
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InputStream imageIn = context.getResourceAsStream(imagePath);// 文件流
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BufferedInputStream bis = new BufferedInputStream(imageIn);// 输入缓冲流
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BufferedOutputStream bos = new BufferedOutputStream(output);// 输出缓冲流
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byte data[] = new byte[4096];// 缓冲字节数
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int size = 0;
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size = bis.read(data);
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while (size != -1) {
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bos.write(data, 0, size);
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size = bis.read(data);
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}
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bis.close();
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bos.flush();// 清空输出缓冲流
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bos.close();
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}
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output.close();
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}
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protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
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doPost(request,response);
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}
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}
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