[ckeditor系列]CKEDITOR 通过SERVLET 打开上传功能

在CKEditor中把上传配置给打开，很简单，脚本段改为如下设置：

<script type="text/javascript">
          CKEDITOR.replace('content',{filebrowserUploadUrl : '/ckeditor/ckeditor/uploader?Type=File',
filebrowserImageUploadUrl : '/ckeditor/ckeditor/uploader?Type=Image',
filebrowserFlashUploadUrl : '/ckeditor/ckeditor/uploader?Type=Flash'
          });
</script>

 这里参数我们可以自己设置，加个Type为了区分文件类型，因为都使用同一个Servlet处理。事情没有这么简单，CKEditor毕竟是个复杂的组件，我们这么配置，看看它给我们还原成什么了吧，在FireFox中使用FireBug查看，看到了这些： 
 
    看到了吧，在Type后面它为我们又挂接了几个参数，其中我们需要的是CKEditorFuncNum和file域的name值 upload，CKEditorFuncNum这个参数是用来回调页面的，就是上传成功后，页面自动切换到“图像”选项卡。upload参数是 servlet获取上传文件用的参数名。其余参数就根据需要进行了。 
    这些参数的名称都是查看源码获得的，不能想当然。有了这些东西后面就好办了，就是文件上传了么。很简单了。这里我们使用apache commons组件中的fileupload和io。 
先看web.xml，我们做些设置。

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
    http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

    <servlet>
        <servlet-name>SimpleUploader</servlet-name>
        <servlet-class>ckeditor.CKEditorUploadServlet</servlet-class>
        <init-param>
            <param-name>baseDir</param-name>
            <param-value>/UserFiles/</param-value>
        </init-param>
        <init-param>
            <param-name>debug</param-name>
            <param-value>false</param-value>
        </init-param>
        <init-param>
            <param-name>enabled</param-name>
            <param-value>true</param-value>
        </init-param>
        <init-param>
            <param-name>AllowedExtensionsFile</param-name>
            <param-value></param-value>
        </init-param>
        <init-param>
            <param-name>DeniedExtensionsFile</param-name>
            <param-value>
                html|htm|php|php2|php3|php4|php5|phtml|pwml|inc|asp|aspx|ascx|jsp|cfm|cfc|pl|bat|exe|com|dll|vbs|js|reg|cgi|htaccess|asis|ftl
            </param-value>
        </init-param>
        <init-param>
            <param-name>AllowedExtensionsImage</param-name>
            <param-value>jpg|gif|jpeg|png|bmp</param-value>
        </init-param>
        <init-param>
            <param-name>DeniedExtensionsImage</param-name>
            <param-value></param-value>
        </init-param>
        <init-param>
            <param-name>AllowedExtensionsFlash</param-name>
            <param-value>swf|fla</param-value>
        </init-param>
        <init-param>
            <param-name>DeniedExtensionsFlash</param-name>
            <param-value></param-value>
        </init-param>
        <load-on-startup>0</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>SimpleUploader</servlet-name>
        <url-pattern>/ckeditor/uploader</url-pattern>
    </servlet-mapping>

    <welcome-file-list>
        <welcome-file>index.html</welcome-file>
    </welcome-file-list>
</web-app>

主要是Servlet的初始化参数，规定了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。分为File，Image和FLASH三种，这个上传参数的设置是对应的。Debug是设置servlet知否进行debug，默认是关闭的。enabled是设置该servlet是否有效，如果禁止上传，就打成false。还有一个baseDir是设定CKEditor上传文件的存放位置。 
    下面就是实现类了，比较长，但是有详细的注释：

package ckeditor;
import java.io.*;
import java.text.SimpleDateFormat;
import java.util.*;
import javax.servlet.ServletException;
import javax.servlet.http.*;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
public class CKEditorUploadServlet extends HttpServlet {
    private static String baseDir;// CKEditor的根目录
    private static boolean debug = false;// 是否debug模式
    private static boolean enabled = false;// 是否开启CKEditor上传
    private static Hashtable allowedExtensions;// 允许的上传文件扩展名
    private static Hashtable deniedExtensions;// 阻止的上传文件扩展名
    private static SimpleDateFormat dirFormatter;// 目录命名格式:yyyyMM
    private static SimpleDateFormat fileFormatter;// 文件命名格式:yyyyMMddHHmmssSSS
    /**
     * Servlet初始化方法
     */
    public void init() throws ServletException {
        // 从web.xml中读取debug模式
        debug = (new Boolean(getInitParameter("debug"))).booleanValue();
        if (debug)
            System.out
                    .println("\r\n---- SimpleUploaderServlet initialization started ----");
        // 格式化目录和文件命名方式
        dirFormatter = new SimpleDateFormat("yyyyMM");
        fileFormatter = new SimpleDateFormat("yyyyMMddHHmmssSSS");
        // 从web.xml中获取根目录名称
        baseDir = getInitParameter("baseDir");
        // 从web.xml中获取是否可以进行文件上传
        enabled = (new Boolean(getInitParameter("enabled"))).booleanValue();
        if (baseDir == null)
            baseDir = "/UserFiles/";
        String realBaseDir = getServletContext().getRealPath(baseDir);
        File baseFile = new File(realBaseDir);
        if (!baseFile.exists()) {
            baseFile.mkdirs();
        }
        // 实例化允许的扩展名和阻止的扩展名
        allowedExtensions = new Hashtable(3);
        deniedExtensions = new Hashtable(3);
        // 从web.xml中读取配置信息
        allowedExtensions.put("File",
        stringToArrayList(getInitParameter("AllowedExtensionsFile")));
        deniedExtensions.put("File",
        stringToArrayList(getInitParameter("DeniedExtensionsFile")));
        allowedExtensions.put("Image",
    stringToArrayList(getInitParameter("AllowedExtensionsImage")));
        deniedExtensions.put("Image",            stringToArrayList(getInitParameter("DeniedExtensionsImage")));
        allowedExtensions.put("Flash",            stringToArrayList(getInitParameter("AllowedExtensionsFlash")));
        deniedExtensions.put("Flash",            stringToArrayList(getInitParameter("DeniedExtensionsFlash")));
        if (debug)
            System.out
                    .println("---- SimpleUploaderServlet initialization completed ----\r\n");
    }
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        doPost(request, response);
    }
    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        if (debug)
            System.out.println("--- BEGIN DOPOST ---");
        response.setContentType("text/html; charset=UTF-8");
        response.setHeader("Cache-Control", "no-cache");
        PrintWriter out = response.getWriter();
        // 从请求参数中获取上传文件的类型：File/Image/Flash
        String typeStr = request.getParameter("Type");
        if (typeStr == null) {
            typeStr = "File";
        }
        if (debug)
            System.out.println(typeStr);
        // 实例化dNow对象，获取当前时间
        Date dNow = new Date();
        // 设定上传文件路径
        String currentPath = baseDir + typeStr + "/"
                + dirFormatter.format(dNow);
        // 获得web应用的上传路径
        String currentDirPath = getServletContext().getRealPath(currentPath);
        // 判断文件夹是否存在，不存在则创建
        File dirTest = new File(currentDirPath);
        if (!dirTest.exists()) {
            dirTest.mkdirs();
        }
        // 将路径前加上web应用名
        currentPath = request.getContextPath() + currentPath;
        if (debug)
            System.out.println(currentDirPath);
        // 文件名和文件真实路径
        String newName = "";
        String fileUrl = "";
        if (enabled) {
            // 使用Apache Common组件中的fileupload进行文件上传
            FileItemFactory factory = new DiskFileItemFactory();
            ServletFileUpload upload = new ServletFileUpload(factory);
            try {
                List items = upload.parseRequest(request);
                Map fields = new HashMap();
                Iterator iter = items.iterator();
                while (iter.hasNext()) {
                    FileItem item = (FileItem) iter.next();
                    if (item.isFormField())
                        fields.put(item.getFieldName(), item.getString());
                    else
                        fields.put(item.getFieldName(), item);
                }
                // CEKditor中file域的name值是upload
                FileItem uplFile = (FileItem) fields.get("upload");
                // 获取文件名并做处理
                String fileNameLong = uplFile.getName();
                fileNameLong = fileNameLong.replace('\\', '/');
                String[] pathParts = fileNameLong.split("/");
                String fileName = pathParts[pathParts.length - 1];
                // 获取文件扩展名
                String ext = getExtension(fileName);
                // 设置上传文件名
                fileName = fileFormatter.format(dNow) + "." + ext;
                // 获取文件名(无扩展名)
                String nameWithoutExt = getNameWithoutExtension(fileName);
                File pathToSave = new File(currentDirPath, fileName);
                fileUrl = currentPath + "/" + fileName;
                if (extIsAllowed(typeStr, ext)) {
                    int counter = 1;
                    while (pathToSave.exists()) {
                        newName = nameWithoutExt + "_" + counter + "." + ext;
                        fileUrl = currentPath + "/" + newName;
                        pathToSave = new File(currentDirPath, newName);
                        counter++;
                    }
                    uplFile.write(pathToSave);
                } else {
                    if (debug)
                        System.out.println("无效的文件类型： " + ext);
                }
            } catch (Exception ex) {
                if (debug)
                    ex.printStackTrace();
            }
        } else {
            if (debug)
                System.out.println("未开启CKEditor上传功能");
        }
        // 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
                + ",'" + fileUrl + "',''" + ")");
        out.println("</script>");
        out.flush();
        out.close();
        if (debug)
            System.out.println("--- END DOPOST ---");
    }
    /**
     * 获取文件名的方法
     */
    private static String getNameWithoutExtension(String fileName) {
        return fileName.substring(0, fileName.lastIndexOf("."));
    }
    /**
     * 获取扩展名的方法
     */
    private String getExtension(String fileName) {
        return fileName.substring(fileName.lastIndexOf(".") + 1);
    }
    /**
     * 字符串像ArrayList转化的方法
     */
    private ArrayList stringToArrayList(String str) {
        if (debug)
            System.out.println(str);
        String[] strArr = str.split("\\|");
        ArrayList tmp = new ArrayList();
        if (str.length() > 0) {
            for (int i = 0; i < strArr.length; ++i) {
                if (debug)
                    System.out.println(i + " - " + strArr[i]);
                tmp.add(strArr[i].toLowerCase());
            }
        }
        return tmp;
    }
    /**
     * 判断扩展名是否允许的方法
     */
    private boolean extIsAllowed(String fileType, String ext) {
        ext = ext.toLowerCase();
        ArrayList allowList = (ArrayList) allowedExtensions.get(fileType);
        ArrayList denyList = (ArrayList) deniedExtensions.get(fileType);
        if (allowList.size() == 0) {
            if (denyList.contains(ext)) {
                return false;
            } else {
                return true;
            }
        }
        if (denyList.size() == 0) {
            if (allowList.contains(ext)) {
                return true;
            } else {
                return false;
            }
        }
        return false;
    }
}

 只要在页面中的script中设置了上传属性，我们打开图片时就能看到上传选项卡了，选择图片后，点击上传到服务器，上传成功就会自动跳到图像选项卡，可以看到源文件已经存在服务器的目标目录中了，此时，我们就可以在编辑器中编辑上传的图片了，非常方便。 
 
    下面我们进行图片上传测试，可以看到如下效果。 
 
    提交后可以看到，数据获得效果，是完全一致的，这样使用CKEditor上传文件就已经成功了。 
 
    我们查看源文件，得到如下结果。

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Display Content</title>
</head>
<body>
<center>
<table width="600" border="0" bordercolor="000000"
    style="table-layout: fixed;">
    <tbody>
        <tr>
            <td width="100" bordercolor="ffffff">主题:</td>
            <td width="500" bordercolor="ffffff">图片上传测试</td>
        </tr>
        <tr>
            <td valign="top" bordercolor="ffffff">内容:</td>
            <td valign="top" bordercolor="ffffff">
            <p style="text-align: center;"><span style="color: #f00;"><strong><span
                style="font-family: courier new, courier, monospace;"><span
                style="font-size: 48px;">图片上传测试</span></span></strong></span></p>
            <p style="text-align: center;"><img alt=""
                src="/ckeditor/UserFiles/Image/201002/20100217232748000.gif"
                style=" 133px; height: 41px;"></p>
            <p style="text-align: center;"><span
                style="font-family: courier new, courier, monospace;"><br>
            </span></p>
            </td>
        </tr>
    </tbody>
</table>
</center>
</body>
</html>

原文地址:http://www.cnblogs.com/hannover/archive/2011/07/29/2120580.html