javaEE 文件上传, commons-fileupload插件

文件上传Jar包下载(2个)：https://pan.baidu.com/s/1QsY36UrPfkLClDqmXL81dg  密码：hfvy

FileuploadServlet.java：

package com.xxx;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
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;
import org.apache.commons.io.IOUtils;

public class FileuploadServlet extends HttpServlet {

	public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

		try {

			//1、创建磁盘文件项工厂
			//作用：设置缓存文件的大小;设置临时文件存储的位置
			String path_temp = this.getServletContext().getRealPath("temp");
			//DiskFileItemFactory factory = new DiskFileItemFactory(1024*1024, new File(path_temp));
			DiskFileItemFactory factory = new DiskFileItemFactory();
			factory.setSizeThreshold(1024*1024);
			factory.setRepository(new File(path_temp));
			//2、创建文件上传的核心类
			ServletFileUpload upload = new ServletFileUpload(factory);
			//设置上传文件的名称的编码
			upload.setHeaderEncoding("UTF-8");

			//ServletFileUpload的API
			boolean multipartContent = upload.isMultipartContent(request);//判断表单是否是文件上传的表单
			if(multipartContent){
				//是文件上传的表单
				//***解析request获得文件项集合
				List<FileItem> parseRequest = upload.parseRequest(request);
				if(parseRequest!=null){
					for(FileItem item : parseRequest){
						//判断是不是一个普通表单项
						boolean formField = item.isFormField();
						if(formField){
							//username=zhangsan
							String fieldName = item.getFieldName();
							String fieldValue = item.getString("UTF-8");//对普通表单项的内容进行编码
							
							System.out.println(fieldName+"----"+fieldValue);
							
							//当表单是enctype="multipart/form-data"时,request.getParameter相关的方法会失效
							
						}else{
							//文件上传项
							//上传的文件名
							String fileName = item.getName();
							//获得上传文件的内容
							InputStream in = item.getInputStream();
							String path_store = this.getServletContext().getRealPath("upload");
							OutputStream out = new FileOutputStream(path_store+"/"+fileName);
							IOUtils.copy(in, out);
							in.close();
							out.close();
							
							//删除临时文件
							item.delete();
							
						}
					}
				}

			}else{
				//不是文件上传表单
				//使用原始的表单数据的获得方式 request.getParameter("username");
			}
		} catch (FileUploadException e) {
			e.printStackTrace();
		}

	}

	public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		doGet(request, response);
	}
}