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