ckeditor插入图片servlet实现
在博客中看到了一位大侠的ckeidtor的图片上传的servlet实现，写的很好，也给了我思路，但是图片上传后，是自动保存在了tomcat的服务器上的，对于图片的管理有些不方便，现对代码进行一些改进，支持将图片放在指定的目录下。
首先在ckeidtor的配置文件config.js中将上传配置打开：脚本如下：
config.filebrowserImageUploadUrl = '../CKEditorImageServlet?Type=Image';
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然后就是web.xml文件的配置了：
<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5"> <servlet> <servlet-name>CKEditorImageServlet</servlet-name> <servlet-class>com.jabberchina.poms.servlet.CKEditorImageServlet</servlet-class> <init-param> <param-name>allowedImageExtensions</param-name> <param-value>jpg|gif|jpeg|png|bmp</param-value> </init-param> <load-on-startup>0</load-on-startup> </servlet> <servlet-mapping> <servlet-name>CKEditorImageServlet</servlet-name> <url-pattern>/CKEditorImageServlet</url-pattern> </servlet-mapping> <session-config> <session-timeout>30</session-timeout> </session-config> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list></web-app>
? 主要是Servlet文件上传的扩展名规则，就是允许上传的类型和阻止上传的类型。与要拦截的URL。
下面就是Servlet的实现了:
package com.servlet;import java.awt.image.BufferedImage;import java.io.IOException;import java.io.PrintWriter;import javax.imageio.ImageIO;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.apache.commons.io.FilenameUtils;import org.springframework.context.ApplicationContext;import org.springframework.web.context.support.WebApplicationContextUtils;import com.dao.CkeditorImageDAO;public class CKEditorImageServlet extends HttpServlet {/** * */private static final long serialVersionUID = -735481391001655214L;private CkeditorImageDAO ckeditorImageDAO;/** * Servlet初始化方法 */public void init() throws ServletException {ApplicationContext ac = WebApplicationContextUtils.getRequiredWebApplicationContext(getServletContext());ckeditorImageDAO = (CkeditorImageDAO) ac.getBean("ckeditorImageDAO");}public void destroy() {ckeditorImageDAO = null;}public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {String fileName = request.getParameter("fileName");String extensionName = FilenameUtils.getExtension(fileName);response.setContentType("image/" + extensionName);BufferedImage bufferImage = ckeditorImageDAO.getFromDisk(fileName);ImageIO.write(bufferImage, extensionName, response.getOutputStream());}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {response.setContentType("text/html; charset=UTF-8");response.setHeader("Cache-Control", "no-cache");PrintWriter out = response.getWriter();String imageURL = "";try {imageURL = ckeditorImageDAO.saveTODisk(request);} catch (Exception e) {e.printStackTrace();}// CKEditorFuncNum是回调时显示的位置，这个参数必须有String callback = request.getParameter("CKEditorFuncNum");out.println("<script type="text/javascript">");out.println("window.parent.CKEDITOR.tools.callFunction(" + callback+ ",'" + imageURL + "',''" + ");");out.println("</script>");out.flush();out.close();}}package com.dao.impl;import java.awt.image.BufferedImage;import java.io.File;import java.io.IOException;import java.util.Date;import java.util.List;import javax.imageio.ImageIO;import javax.servlet.http.HttpServletRequest;import org.apache.commons.fileupload.FileItem;import org.apache.commons.fileupload.disk.DiskFileItemFactory;import org.apache.commons.fileupload.servlet.ServletFileUpload;import org.apache.commons.io.FilenameUtils;import com.dao.CkeditorImageDAO;public class CkeditorImageDAOImpl implements CkeditorImageDAO{private String dataFilePath;private String ckeditorImageServletPath;public String getCkeditorImageServletPath() {return ckeditorImageServletPath;}public void setCkeditorImageServletPath(String ckeditorImageServletPath) {this.ckeditorImageServletPath = ckeditorImageServletPath;}public String getDataFilePath() {return dataFilePath;}public void setDataFilePath(String dataFilePath) {this.dataFilePath = dataFilePath;}@SuppressWarnings("unchecked")public String saveTODisk(HttpServletRequest request) throws Exception {String imageURL = "";// 判断文件夹是否存在，不存在则创建File dirTest = new File(dataFilePath);if (!dirTest.exists()) {dirTest.mkdirs();}ServletFileUpload upload = new ServletFileUpload(new DiskFileItemFactory());try {List<FileItem> items = upload.parseRequest(request);if (items != null && !items.isEmpty()) {FileItem fileItem = items.get(0);//目前ckeditor编辑器只允许同时上传一个图片文件，所以只处理第一个即可String fileName = new Date().getTime() + "."+ FilenameUtils.getExtension(fileItem.getName());//获取文件扩展名File pathToSave = new File(dataFilePath, fileName);fileItem.write(pathToSave);imageURL = this.ckeditorImageServletPath + fileName;}} catch (Exception ex) {throw ex;}return imageURL;}public BufferedImage getFromDisk(String fileName) throws IOException {File file = new File(dataFilePath + fileName);BufferedImage bufferImage = ImageIO.read(file);return bufferImage;}}??dataFilePath为图片要上传到磁盘路径：如为：D:/poms_workspace/upload/
ckeditorImageDAO与ckeditorImageServletPath 需要在spring的配置文件中进行配置：
<bean id="ckeditorImageDAO" name="ckeditorImageDAO"scope="prototype"> <property name="dataFilePath" value="${dataFilePath}"></property> <property name="ckeditorImageServletPath" value="../CKEditorImageServlet?fileName="></property></bean>?
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package com.dao;import java.awt.image.BufferedImage;import java.io.IOException;import javax.servlet.http.HttpServletRequest;public interface CkeditorImageDAO {public String saveTODisk(HttpServletRequest request) throws Exception;public BufferedImage getFromDisk(String fileName) throws IOException;}?
此servlet实现写在了一个servlet中，可以分别写两个servlet，一个是上传图片，一个是读取图片。在此取了个巧，因为上传文件时，是以表单的方式post上去的，所以写在doPost方法中，而对于图片的读取我们用的是"URL?fileName="的get形式发送的请求，所以写在了doGet方法中实现。