java基于servlet实现文件上传功能

 

 

 
上传文件
 
 
 
 
  
 
  Submit
  Reset
 
 
 
 
 
 
 
 

<?xml version="1.0" encoding="UTF-8"?>

 myShop
 
 index.html
 index.htm
 index.jsp
 default.html
 default.htm
 default.jsp
 
 
 
 upload
 com.epoint.shop.fileupload.UpLoadServlet
 
 filePath
 E://workspace1/myShop/WebContent/upload
 
 
 tempFilePath
 temp
 
 
 
 
 upload
 /upload
 

package com.epoint.shop.fileupload;
 
import java.io.File;
import java.io.IOException;
 
import java.io.PrintWriter;
import java.lang.reflect.Method;
import java.util.List;
 
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
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.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
@WebServlet("/UpLoad")
public class UpLoadServlet extends HttpServlet {
 private static final long serialVersionUID = 1L;
 private static String TEMP_FOLDER="/upload";
 // 上传配置
 private static final int MEMORY_THRESHOLD = 1024 * 1024 * 3; // 3MB
 private static final int MAX_FILE_SIZE = 1024 * 1024 * 40; // 40MB
 private static final int MAX_REQUEST_SIZE = 1024 * 1024 * 50; // 50MB
 private String filePath; //存放上传文件的目录
 private String tempFilePath; //存放临时文件的目录
 
 public UpLoadServlet() {
 super();
 
 }
 public void init(ServletConfig config)throws ServletException {
 super.init(config);
 filePath=config.getInitParameter("filePath");
 System.out.println(filePath);
 }
 
 
 protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
 doPost(request, response);
 }
 protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
 request.setCharacterEncoding("utf-8"); 
 response.setCharacterEncoding("utf-8");
 String methodName=request.getParameter("method");
 if(methodName!=null){
 try {
  Method method=this.getClass().getDeclaredMethod(methodName,HttpServletRequest.class,HttpServletResponse.class);
 method.invoke(this, request,response);
 } catch (Exception e) {
 e.printStackTrace();
 }
  
 
 }
 }
 public void uploadPic(HttpServletRequest request, HttpServletResponse response) throws Exception{
 
 //检测是否为多媒体上传
 
 if(!ServletFileUpload.isMultipartContent(request)){
 //如果不是就停止
 PrintWriter writer=response.getWriter();
 writer.println("表单中必须包含enctype=multipart/form-data");
 writer.flush();
 return;
 }
 DiskFileItemFactory factory = new DiskFileItemFactory(); // 创建文件项目工厂对象
 factory.setRepository(new File(savePath)); //设置临时文件夹为TEMP_FOLDER
 factory.setSizeThreshold(1024 * 1024);  // 设置缓冲区大小为 1M
 // 构造临时路径来存储上传的文件
 ServletFileUpload upload = new ServletFileUpload(factory);//用工厂实例化上传组件,ServletFileUpload用来解析文件上传请求 
 // 设置最大文件上传值
 upload.setFileSizeMax(MAX_FILE_SIZE);
 // 设置最大请求值 (包含文件和表单数据)
 upload.setSizeMax(MAX_REQUEST_SIZE);
 upload.setHeaderEncoding("UTF-8"); 
 @SuppressWarnings("unchecked")
 List list = upload.parseRequest(request);
 if (list != null && list.size() > 0) {
  for (FileItem item : list) {
  if (!item.isFormField()) {
   String fileName = new File(item.getName()).getName();
   File storeFile = new File(filePath,fileName);
   // 保存文件到硬盘
   item.write(storeFile);
   request.setAttribute("message","文件上传成功!");
  }
  }
 }
 } 
}

List list = upload.parseRequest(request);