服務端：通過Servlet + fileupload 等實現

jar：commons-fileupload-1.3.1.jar，commons-io-2.4.jar

客戶端上傳見：Java 上傳檔案客戶端程式碼(二)

package com.http.servlet;

import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Iterator;
import java.util.List;

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

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
 
public class HttpServletUpload extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public HttpServletUpload() {
		super();
	}

	/**
	 * Destruction of the servlet. <br>
	 */
	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}

	/**
	 * The doGet method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		 this.doPost(request, response);
	}

	/**
	 * The doPost method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to post.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		request.setCharacterEncoding("UTF-8");
		response.setCharacterEncoding("UTF-8");
		 PrintWriter out = null;  
	     response.setContentType("text/html;charset=UTF-8"); 
		 //利用apache的common-upload上傳元件來進行  來解析獲取到的流檔案   
		//把上傳來的檔案放在這裡  
        String uploadPath = getServletContext().getRealPath("/upload");//獲取檔案路徑 
        //檢測是不是存在上傳檔案  
        // Check that we have a file upload request  
        boolean isMultipart = ServletFileUpload.isMultipartContent(request);  
        if(isMultipart){   
            DiskFileItemFactory factory = new DiskFileItemFactory();  
            //指定在記憶體中快取資料大小,單位為byte,這裡設為1Mb  
            factory.setSizeThreshold(1024*1024);  
            //設定一旦檔案大小超過getSizeThreshold()的值時資料存放在硬碟的目錄   
            factory.setRepository(new File("D://temp"));  
            // Create a new file upload handler  
            ServletFileUpload upload = new ServletFileUpload(factory);  
            // 指定單個上傳檔案的最大尺寸,單位:位元組，這裡設為5Mb    
            upload.setFileSizeMax(5 * 1024 * 1024);    
            //指定一次上傳多個檔案的總尺寸,單位:位元組，這裡設為10Mb    
            upload.setSizeMax(10 * 1024 * 1024);     
            upload.setHeaderEncoding("UTF-8"); //設定編碼，因為我的jsp頁面的編碼是utf-8的   
            List<FileItem> items = null;   
            try {  
                // 解析request請求  
                items = upload.parseRequest(request);  
            } catch (FileUploadException e) {  
                e.printStackTrace();  
            }  
            if(items!=null){  
                //把上傳檔案放到伺服器的這個目錄下  
                if (!new File(uploadPath).isDirectory()){    
                    new File(uploadPath).mkdirs(); //選定上傳的目錄此處為當前目錄，沒有則建立    
                }   
                //解析表單專案  
                // Process the uploaded items  
                Iterator<FileItem> iter = items.iterator();  
                while (iter.hasNext()) {  
                    FileItem item = iter.next();  
                    //如果是普通表單屬性  
                    if (item.isFormField()) {  
                        //<input type="text" name="content">  
                        String name = item.getFieldName();//相當於input的name屬性  
                        String value = item.getString();//input的value屬性  
                        System.out.println("屬性:"+name+" 屬性值:"+value);  
                    }  
                    //如果是上傳檔案  
                    else {  
                        //屬性名  
                        String fieldName = item.getFieldName();  
                        SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss");
                        //上傳檔案路徑  
                        String fileName = item.getName();  
                        fileName = fileName.substring(fileName.lastIndexOf("/")+1);// 獲得上傳檔案的檔名  
                        fileName = sdf.format(new Date()) + ".jpg";
                        try {  
                            item.write(new File(uploadPath,fileName));  
                        } catch (Exception e) {  
                            e.printStackTrace();  
                        }  
                        //給請求頁面返回響應  
                        response.getWriter().println("檔案上傳成功! 檔名是:"+fileName);  
                    }  
                }   
            }   
        }
        
        try {  
            out = response.getWriter();  
            out.print("{success:true, msg:'接收成功'}");  
            out.close();  
        } catch (IOException e) {  
            e.printStackTrace();  
        }  
       
	}

	/**
	 * Initialization of the servlet. <br>
	 *
	 * @throws ServletException if an error occurs
	 */
	public void init() throws ServletException {
		// Put your code here
	}

}