image-download - adding jsp and plain copy to response method
This commit is contained in:
Slavisa Baeldung
parent
a58a896ac8
commit
a72def9d89
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@ -1,54 +1,64 @@
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package com.baeldung.spring.controller;
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import java.io.IOException;
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import java.io.InputStream;
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import javax.servlet.ServletContext;
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import org.apache.commons.io.IOUtils;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.core.io.DefaultResourceLoader;
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import org.springframework.core.io.Resource;
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import org.springframework.core.io.ResourceLoader;
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import org.springframework.http.HttpHeaders;
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import org.springframework.http.HttpStatus;
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import org.springframework.http.MediaType;
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import org.springframework.http.ResponseEntity;
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import org.springframework.http.*;
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import org.springframework.stereotype.Controller;
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import org.springframework.web.bind.annotation.RequestMapping;
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import org.springframework.web.bind.annotation.RequestMethod;
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import org.springframework.web.bind.annotation.ResponseBody;
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import org.springframework.web.context.support.ServletContextResourceLoader;
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import org.springframework.web.context.support.ServletContextResource;
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import javax.servlet.ServletContext;
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import javax.servlet.http.HttpServletResponse;
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import java.io.IOException;
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import java.io.InputStream;
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import java.util.concurrent.TimeUnit;
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@Controller
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public class ImageController {
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@Autowired
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ServletContext servletContext;
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private ServletContext servletContext;
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@RequestMapping(value = "/image-response-entity", method = RequestMethod.GET)
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public ResponseEntity<byte[]> getImageAsREsponseEntity() throws IOException {
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final InputStream in = servletContext.getResourceAsStream("/WEB-INF/images/image-example.jpg");
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byte[] media = IOUtils.toByteArray(in);
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final HttpHeaders headers = new HttpHeaders();
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headers.setContentType(MediaType.IMAGE_JPEG);
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return new ResponseEntity<byte[]>(media, headers, HttpStatus.OK);
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@RequestMapping(value = "/image-view", method = RequestMethod.GET)
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public String imageView() throws IOException {
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return "image-download";
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}
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@RequestMapping(value = "/image-byte-array", method = RequestMethod.GET, produces = MediaType.IMAGE_JPEG_VALUE)
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public @ResponseBody byte[] getImageAsByteArray() throws IOException {
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@RequestMapping(value = "/image-manual-response", method = RequestMethod.GET)
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public void getImageAsByteArray(HttpServletResponse response) throws IOException {
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final InputStream in = servletContext.getResourceAsStream("/WEB-INF/images/image-example.jpg");
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response.setContentType(MediaType.IMAGE_JPEG_VALUE);
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IOUtils.copy(in, response.getOutputStream());
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}
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@RequestMapping(value = "/image-byte-array", method = RequestMethod.GET)
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@ResponseBody
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public byte[] getImageAsByteArray() throws IOException {
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final InputStream in = servletContext.getResourceAsStream("/WEB-INF/images/image-example.jpg");
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return IOUtils.toByteArray(in);
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}
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@RequestMapping(value = "/image-response-entity", method = RequestMethod.GET)
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public ResponseEntity<byte[]> getImageAsResponseEntity() {
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ResponseEntity<byte[]> responseEntity;
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final HttpHeaders headers = new HttpHeaders();
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try {
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final InputStream in = servletContext.getResourceAsStream("/WEB-INF/images/image-example.jpg");
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byte[] media = IOUtils.toByteArray(in);
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headers.setCacheControl(CacheControl.noCache().getHeaderValue());
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responseEntity = new ResponseEntity<>(media, headers, HttpStatus.OK);
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} catch (IOException ioe) {
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responseEntity = new ResponseEntity<>(null, headers, HttpStatus.INTERNAL_SERVER_ERROR);
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}
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return responseEntity;
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}
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@RequestMapping(value = "/image-resource", method = RequestMethod.GET)
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@ResponseBody
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@RequestMapping(value = "/image-resource", method = RequestMethod.GET, produces = MediaType.IMAGE_JPEG_VALUE)
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public Resource getImageAsResource() {
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ResourceLoader resourceLoader = new ServletContextResourceLoader(servletContext);
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return resourceLoader.getResource("/WEB-INF/images/image-example.jpg");
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return new ServletContextResource(servletContext, "/WEB-INF/images/image-example.jpg");
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}
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}
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@ -1,12 +1,16 @@
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<?xml version="1.0" encoding="UTF-8"?>
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<beans xmlns="http://www.springframework.org/schema/beans"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd">
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc"
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xmlns:context="http://www.springframework.org/schema/context"
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xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd
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http://www.springframework.org/schema/mvc
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http://www.springframework.org/schema/mvc/spring-mvc-4.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
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<context:component-scan base-package="com.baeldung.spring.controller"/>
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<!-- Start: Mapping by bean name (BeanNameUrlHandlerMapping) -->
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<bean
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class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping">
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<bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping">
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<property name="order" value="1"/>
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</bean>
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@ -0,0 +1,18 @@
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
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"http://www.w3.org/TR/html4/loose.dtd">
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<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
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<%@ page contentType="text/html;charset=UTF-8" language="java" %>
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<html>
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<head>
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<title>Image download examples</title>
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</head>
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<body>
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<h1>Image download examples</h1>
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<ul>
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<li><a href="<c:url value="/image-manual-response" />">Image manually add to response</a></li>
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<li><a href="<c:url value="/image-byte-array.jpg" />">Image Download <i>byte[]</i> Example</a></li>
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<li><a href="<c:url value="/image-response-entity.jpg" />">Image Download <i>ResponseEntity</i> Example</a></li>
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<li><a href="<c:url value="/image-resource.jpg" />">Image Download <i>Resource</i> Example</a></li>
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</ul>
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</body>
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</html>
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@ -13,6 +13,7 @@
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<ul>
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<li><a href="employee">Welcome Page</a></li>
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<li><a href="spring-handler-index.jsp">Spring Handler Mapping Examples</a></li>
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<li><a href="image-view">Image Download Examples</a></li>
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</ul>
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</body>
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