kindeditor图片上传 struts2实现

一、kindeditor以及struts2部署搭建不再赘述,如需要请参考kindeditor使用方法 Struts2框架搭建

二、kindeditor图片上传所依赖jar包在kindeditor\jsp\lib下有

三、以下列出部分核心代码,如需要全部源码可点击下载

JSP

Struts

Action
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.text.SimpleDateFormat;
import java.util.Arrays;
import java.util.Date;
import java.util.HashMap;
import java.util.Random;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.struts2.ServletActionContext;
import org.apache.struts2.dispatcher.multipart.MultiPartRequestWrapper;
import org.json.simple.JSONObject;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;

public class ImgUploadAction extends ActionSupport {
	private static final long serialVersionUID = 1L;

	public String imgUpload() {
		//获取response、request对象
		ActionContext ac = ActionContext.getContext();
		HttpServletResponse response = (HttpServletResponse) ac.get(ServletActionContext.HTTP_RESPONSE);
		HttpServletRequest request = (HttpServletRequest) ac.get(ServletActionContext.HTTP_REQUEST);

		PrintWriter out = null; //输出流
		try {
			out = response.getWriter();
		} catch (IOException e1) {
			e1.printStackTrace();
		}

		String savePath = ServletActionContext.getServletContext().getRealPath("/") + "attached/";

		// 文件保存目录URL
		String saveUrl = request.getContextPath() + "/attached/";

		// 定义允许上传的文件扩展名
		HashMap<String, String> extMap = new HashMap<String, String>();
		extMap.put("image", "gif,jpg,jpeg,png,bmp");
		extMap.put("flash", "swf,flv");
		extMap.put("media", "swf,flv,mp3,wav,wma,wmv,mid,avi,mpg,asf,rm,rmvb");
		extMap.put("file", "doc,docx,xls,xlsx,ppt,htm,html,txt,zip,rar,gz,bz2");

		// 最大文件大小
		long maxSize = 1000000;

		response.setContentType("text/html; charset=UTF-8");

		if (!ServletFileUpload.isMultipartContent(request)) {
			out.println(getError("请选择文件。"));
			return null;
		}
		// 检查目录
		File uploadDir = new File(savePath);
		if (!uploadDir.isDirectory()) {
			out.println(getError("上传目录不存在。"));
			return null;
		}
		// 检查目录写权限
		if (!uploadDir.canWrite()) {
			out.println(getError("上传目录没有写权限。"));
			return null;
		}

		String dirName = request.getParameter("dir");
		if (dirName == null) {
			dirName = "image";
		}
		if (!extMap.containsKey(dirName)) {
			out.println(getError("目录名不正确。"));
			return null;
		}
		// 创建文件夹
		savePath += dirName + "/";
		saveUrl += dirName + "/";
		File saveDirFile = new File(savePath);
		if (!saveDirFile.exists()) {
			saveDirFile.mkdirs();
		}
		SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
		String ymd = sdf.format(new Date());
		savePath += ymd + "/";
		saveUrl += ymd + "/";
		File dirFile = new File(savePath);
		if (!dirFile.exists()) {
			dirFile.mkdirs();
		}

		FileItemFactory factory = new DiskFileItemFactory();
		ServletFileUpload upload = new ServletFileUpload(factory);
		upload.setHeaderEncoding("UTF-8");
		MultiPartRequestWrapper wrapper = (MultiPartRequestWrapper) request;
		// 获得上传的文件名
		String fileName = wrapper.getFileNames("imgFile")[0];// imgFile,imgFile,imgFile
		// 获得文件过滤器
		File file = wrapper.getFiles("imgFile")[0];

		// 检查扩展名
		String fileExt = fileName.substring(fileName.lastIndexOf(".") + 1).toLowerCase();
		if (!Arrays.<String> asList(extMap.get(dirName).split(",")).contains(fileExt)) {
			out.println(getError("上传文件扩展名是不允许的扩展名。\n只允许" + extMap.get(dirName)
					+ "格式。"));
			return null;
		}
		// 检查文件大小
		if (file.length() > maxSize) {
			out.println(getError("上传文件大小超过限制。"));
			return null;
		}

		// 重构上传图片的名称
		SimpleDateFormat df = new SimpleDateFormat("yyyyMMddHHmmss");
		String newImgName = df.format(new Date()) + "_"
				+ new Random().nextInt(1000) + "." + fileExt;
		byte[] buffer = new byte[1024];
		// 获取文件输出流
		FileOutputStream fos;
		// 获取内存中当前文件输入流
		InputStream in;
		try {
			fos = new FileOutputStream(savePath + "/" + newImgName);
			in = new FileInputStream(file);
			int num = 0;
			while ((num = in.read(buffer)) > 0) {
				fos.write(buffer, 0, num);
			}
			in.close();
			fos.close();
		} catch (FileNotFoundException e1) {
			e1.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		
		// 发送给 kindeditor
		JSONObject obj = new JSONObject();
		obj.put("error", 0);
		obj.put("url", saveUrl + "/" + newImgName);
		out.println(obj.toJSONString());
		return null;
	}

	private String getError(String message) {
		JSONObject obj = new JSONObject();
		obj.put("error", 1);
		obj.put("message", message);
		return obj.toJSONString();
	}
}
kindeditor有自带的jsp图片上传demo
uploadJson : '../jsp/upload_json.jsp'
但如果按照upload_json.jsp中的程序进行上传时执行到

List items = upload.parseRequest(request);
Iterator itr = items.iterator();
while (itr.hasNext()) {}
发现itr为空 取不到上传文件 故没有执行while循环,也就没有返回值,kindeditor报服务器错误.为什么取不到值,是因为：
struts2过滤访问jsp时,会改变reqeust的类型,由HttpServletRequest变成MultiPartRequestWrapper,所以parseRequest就返回了null
于是我们就需要对request进行转换

MultiPartRequestWrapper wrapper = (MultiPartRequestWrapper) request;
这样就可以通过wrapper获取上传文件

效果如图：




作者：itmyhome
源码：下载