利用servlet3.0 實現檔案上傳

2.專案環境

servlet  jsp  javabean

3.功能實現

package com.demo.action;

import java.io.File;
import java.io.IOException;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.annotation.MultipartConfig;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.Part;


@WebServlet("/uploadServlet")
@MultipartConfig
public class UploadServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;

	@Override
	protected void service(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		request.setCharacterEncoding("UTF-8");
		response.setContentType("text/html;charset=UTF-8");
		String status="success";
		String fileName="demo";
		request.setCharacterEncoding("utf-8");
		response.setCharacterEncoding("utf-8");
		response.setContentType("text/html;charset=utf-8");
		// 儲存路徑
		String savePath = request.getServletContext().getRealPath("uploadfile");
		    // 上傳單個檔案
			// Servlet3.0將multipart/form-data的POST請求封裝成Part，通過Part對上傳的檔案進行操作。
			Part part = request.getPart("file");// 通過表單file控制元件(<input type="file" name="file">)的名字直接獲取Part物件
			// Servlet3沒有提供直接獲取檔名的方法,需要從請求頭中解析出來
			// 獲取請求頭，請求頭的格式：form-data; name="file"; filename="demo.zip"
			String header = part.getHeader("content-disposition");
			// 獲取檔名
			String fileName = getFileName(header);
			String filePath = savePath + File.separator + fileName;
			String newFileName = File.separator+System.currentTimeMillis()+".zip";//寫成zip字尾，能夠在window環境，瀏覽器下直接下載
			String resultFielPath=savePath+newFileName;
			String downloadpath="uploadfile"+newFileName;
			// 把檔案寫到指定路徑
			part.write(filePath);
			List<String> strlist = FileUtil.readFile(filePath);
			if(strlist!=null && imeilist.size()>0){
				for (int i = 0; i < strlist.size(); i++) {
				       //檔案寫入
					FileUtil.writeFile(strlist.get(i)+"\t"+result+"\n", resultFielPath);
				}
			}
			request.setAttribute("downloadpath",downloadpath); //檔案下載路徑
			request.setAttribute("message", "上傳解析成功");
			request.setAttribute("status", status);

    	request.getRequestDispatcher("index.jsp").forward(request,response);
	}

	
	/**
	 * 根據請求頭解析出檔名
	 * @param header 請求頭
	 * @return 檔名
	 */
	public String getFileName(String header) {
		String[] tempArr1 = header.split(";");
		String[] tempArr2 = tempArr1[2].split("=");
		// 獲取檔名，相容各種瀏覽器
		String fileName = tempArr2[1].substring(tempArr2[1].lastIndexOf("\\") + 1).replaceAll("\"", "");
		return fileName;
	}

}