kindEditor上傳圖片時將upload_json.jsp轉成action時，功能很差用

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() {
		//獲取response、request對象
		ActionContext ac = ActionContext.getContext();
		HttpServletResponse response = (HttpServletResponse) ac.get(ServletActionContext.HTTP_RESPONSE);
		HttpServletRequest request = (HttpServletRequest) ac.get(ServletActionContext.HTTP_REQUEST);
 
		PrintWriter out = null; //輸出流
		try {
			out = response.getWriter();
		} catch (IOException e1) {
			e1.printStackTrace();
		}
 
		String savePath = ServletActionContext.getServletContext().getRealPath("/") + "attached/";
 
		// 文件保存目錄URL
		String saveUrl = request.getContextPath() + "/attached/";
 
		// 定義容許上傳的文件擴展名
		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("請選擇文件。"));
			return null;
		}
		// 檢查目錄
		File uploadDir = new File(savePath);
		if (!uploadDir.isDirectory()) {
			out.println(getError("上傳目錄不存在。"));
			return null;
		}
		// 檢查目錄寫權限
		if (!uploadDir.canWrite()) {
			out.println(getError("上傳目錄沒有寫權限。"));
			return null;
		}
 
		String dirName = request.getParameter("dir");
		if (dirName == null) {
			dirName = "image";
		}
		if (!extMap.containsKey(dirName)) {
			out.println(getError("目錄名不正確。"));
			return null;
		}
		// 建立文件夾
		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;
		// 得到上傳的文件名
		String fileName = wrapper.getFileNames("imgFile")[0];// imgFile,imgFile,imgFile
		// 得到文件過濾器
		File file = wrapper.getFiles("imgFile")[0];
 
		// 檢查擴展名
		String fileExt = fileName.substring(fileName.lastIndexOf(".") + 1).toLowerCase();
		if (!Arrays.<String> asList(extMap.get(dirName).split(",")).contains(fileExt)) {
			out.println(getError("上傳文件擴展名是不容許的擴展名。\n只容許" + extMap.get(dirName)
					+ "格式。"));
			return null;
		}
		// 檢查文件大小
		if (file.length() > maxSize) {
			out.println(getError("上傳文件大小超過限制。"));
			return null;
		}
 
		// 重構上傳圖片的名稱
		SimpleDateFormat df = new SimpleDateFormat("yyyyMMddHHmmss");
		String newImgName = df.format(new Date()) + "_"
				+ new Random().nextInt(1000) + "." + fileExt;
		byte[] buffer = new byte[1024];
		// 獲取文件輸出流
		FileOutputStream fos;
		// 獲取內存中當前文件輸入流
		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();
		}
		
		// 發送給 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有自帶的jsp圖片上傳demo

uploadJson : '../jsp/upload_json.jsp'

但若是按照upload_json.jsp中的程序進行上傳時執行到

List items = upload.parseRequest(request);
Iterator itr = items.iterator();
while (itr.hasNext()) {}

發現itr爲空 取不到上傳文件 故沒有執行while循環,也就沒有返回值,kindeditor報服務器錯誤.爲何取不到值,是由於：

struts2過濾訪問jsp時,會改變reqeust的類型,由HttpServletRequest變成MultiPartRequestWrapper,因此parseRequest就返回了null

因而咱們就須要對request進行轉換
 

MultiPartRequestWrapper wrapper = (MultiPartRequestWrapper) request;

這樣就能夠經過wrapper獲取上傳文件

String fileName = wrapper.getFileNames("imgFile")[0];
File file = wrapper.getFiles("imgFile")[0];