Source code for index.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<!-- JSP -->
<img src="${pageContext.request.contextPath}/image/demo1.jpg" />
<img src="${pageContext.request.contextPath}/image/demo2.jpg" />
</body>
</html>
Source code for ImageServlet.java
package com.t4b.demo.controller;
import java.io.File;
import java.io.IOException;
import java.net.URLDecoder;
import java.nio.file.Files;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet("/image/*")
public class ImageServlet extends HttpServlet {
private String imagePath;
public void init() throws ServletException {
this.imagePath = "D:/image";
}
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String requestedImage = request.getPathInfo();
if (requestedImage == null) {
response.sendError(HttpServletResponse.SC_NOT_FOUND);
return;
}
File image = new File(imagePath, URLDecoder.decode(requestedImage, "UTF-8"));
if (!image.exists()) {
response.sendError(HttpServletResponse.SC_NOT_FOUND); // 404.
return;
}
String contentType = getServletContext().getMimeType(image.getName());
if (contentType == null || !contentType.startsWith("image")) {
response.sendError(HttpServletResponse.SC_NOT_FOUND); // 404.
return;
}
response.reset();
response.setContentType(contentType);
response.setHeader("Content-Length", String.valueOf(image.length()));
Files.copy(image.toPath(), response.getOutputStream());
}
}
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