Java 文件上传

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index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
	String path = request.getContextPath();
	String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort()
			+ path + "/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">

<title>My JSP 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->
<script type="text/javascript"
	src="https://www.idaobin.com/js/jquery-3.2.1.js"></script>
<script type="text/javascript"
	src="https://www.idaobin.com/test/ajaxfileupload.js"></script>
<script type="text/javascript">
	function ajaxFileUpload() {
		$.ajaxFileUpload(
			{
				url : '/testweb/upload', //用于文件上传的服务器端请求地址
				secureuri : false, //一般设置为false
				fileElementId : 'file', //文件上传空间的id属性 <input type="file" id="file" name="file" />
				dataType : 'text', //返回值类型 一般设置为json
				success : function(data, status) //服务器成功响应处理函数
				{
					//方法一,用后台返回值
					alert(data); //后台out输出的值
					
				},
				error : function(data, status, e) //服务器响应失败处理函数
				{
					//方法一,用后台返回值
					alert(data); //后台out输出的值
					
				}
			}
		)

		return false;

	}
</script>
</head>

<body>
	This is my JSP page.
	<br>
	<div id="btn">click</div>
	<input type="file" id="file" name="file" />
    <br />
    <input type="button" value="上传" onclick="return ajaxFileUpload();">
    
    <br>
    <p><span id="myspan"></span></p>
</body>
</html>

servlet:

package test;

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

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;


/**
 * Servlet implementation class upload
 */
@WebServlet("/upload")
public class upload extends HttpServlet {
	private static final long serialVersionUID = 1L;
	private static final String UPLOAD_DIRECTORY = "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
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public upload() {
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		response.getWriter().append("Served at: ").append(request.getContextPath());
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		response.setCharacterEncoding("UTF-8"); 
		request.setCharacterEncoding("UTF-8");
        response.setContentType("text/html;charset=utf-8");

		//PrintWriter writer = response.getWriter();
        // 检测是否为多媒体上传
        if (!ServletFileUpload.isMultipartContent(request)) {
            // 如果不是则停止
        	response.getWriter().print("上传失败!");
        	response.getWriter().flush();
            //writer.println("上传失败!");
            //writer.flush();
            return;
        }
 
        // 配置上传参数
        DiskFileItemFactory factory = new DiskFileItemFactory();
        // 设置内存临界值 - 超过后将产生临时文件并存储于临时目录中
        factory.setSizeThreshold(MEMORY_THRESHOLD);
        // 设置临时存储目录
        factory.setRepository(new File(System.getProperty("java.io.tmpdir")));
 
        ServletFileUpload upload = new ServletFileUpload(factory);
         
        // 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);
 
        // 构造临时路径来存储上传的文件
        // 这个路径相对当前应用的目录
        String uploadPath = request.getContextPath() + File.separator + UPLOAD_DIRECTORY;
        
        //获取项目发布路径  下的upload文件夹
        uploadPath = request.getSession().getServletContext().getRealPath("/upload");
        
         
        // 如果目录不存在则创建
        File uploadDir = new File(uploadPath);
        if (!uploadDir.exists()) {
            uploadDir.mkdir();
        }
 
        try {
            // 解析请求的内容提取文件数据
            List<FileItem> formItems = upload.parseRequest(request);
 
            if (formItems != null && formItems.size() > 0) {
                // 迭代表单数据
                for (FileItem item : formItems) {
                    // 处理不在表单中的字段
                    if (!item.isFormField()) {
                        System.out.println(item.getName());
                        String fileName = new File(item.getName()).getName();
                        String filePath = uploadPath + File.separator + getDate() +"-" + fileName.replace(" ", "");
                        String suffix = fileName.substring(fileName.lastIndexOf(".") + 1).toLowerCase(); //后缀名 ,没有.
                        File storeFile = new File(filePath);
                        // 在控制台输出文件的上传路径
                        System.out.println(filePath);
                        System.out.println(suffix);
                        // 保存文件到硬盘
                        item.write(storeFile);
                        //writer.println("上传成功!");
                        response.getWriter().print("上传成功!");
                    }
                }
            }
            
        } catch (Exception ex) {
            ex.printStackTrace();
        }
	}
	/**
	 * 日期-文件名
	 * @return
	 */
	private String getDate() {
		SimpleDateFormat df = new SimpleDateFormat("yyyyMMddHHmmss");
		String dt=df.format(new Date());
		return dt;
	}
}

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原文链接:https://www.idaobin.com/archives/2068.html

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