ckeditor安插图片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';

?

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"
	class="com.jabberchina.poms.dao.impl.CkeditorImageDAOImpl" scope="prototype">
    <property name="dataFilePath" value="${dataFilePath}"></property>
    <property name="ckeditorImageServletPath" value="../CKEditorImageServlet?fileName="></property>
</bean>

?

?

?

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。