Java web 圖片上傳(文件上傳)


1、首先布局界面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">
-->

</head>

<body>
<form action="uploadpic" enctype="multipart/form-data" method="post">
<input type="file" name="file1">
<input type="submit" value="上傳">
</form>
</body>
</html>

2、編寫提交表單對應的servlet (PicUpload .java)
將圖片上傳到項目對應的upload文件加下,查看圖片是否上傳成功要到項目所在的磁盤中查看

package com.upload;
import java.io.File;
import java.io.IOException;
import java.util.List;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletContext;
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.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import com.beans.Pic;
public class PicUpload extends HttpServlet {

private static final long serialVersionUID = 1L;
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
// TODO Auto-generated method stub
super.doGet(req, resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
// TODO Auto-generated method stub
System.out.println("nihao");
req.setCharacterEncoding("utf-8");
resp.setContentType("text/html;charset=utf-8");
// 為解析類提供配置信息
DiskFileItemFactory factory = new DiskFileItemFactory();
// 創建解析類的實例
ServletFileUpload sfu = new ServletFileUpload(factory);
// 開始解析
// sfu.setSizeMax(1024 * 400);
// 每個表單域中數據會封裝到一個對應的FileItem對象上
try {
List<FileItem> items = sfu.parseRequest(req);
// 區分表單域
for (int i = 0; i < items.size(); i++) {
System.out.println("01");
FileItem item = items.get(i);
// isFormField為true,表示這不是文件上傳表單域
if (!item.isFormField()) {
ServletContext sctx = getServletContext();
// 獲得存放文件的物理路徑
// upload下的某個文件夾 得到當前在線的用戶 找到對應的文件夾
String path = sctx.getRealPath("");
System.out.println(path);
// 獲得文件名
String fileName = item.getName();
String lind = fileName.substring(fileName.lastIndexOf("."));
String picname =String.valueOf(System.currentTimeMillis())
+ lind;
File file = new File(path +"\\"+"upload"+"\\"+picname);
System.out.println(picname);
if (!file.exists()) {
item.write(file);
// 將上傳圖片的名字記錄到數據庫中

List<Pic> allpic=picDao.getAllPic();
req.setAttribute("piclist", allpic);
req.setAttribute("name", "1443751877241.jpg");
RequestDispatcher dispatcher = req.getRequestDispatcher("ok.jsp"); // 使用req對象獲取RequestDispatcher對象
dispatcher.forward(req, resp);
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
}

3、配置servlet(web.xml)

<servlet>
<servlet-name>Uploadpic</servlet-name>
<servlet-class>com.upload.PicUpload</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Uploadpic</servlet-name>
<url-pattern>/uploadpic</url-pattern>
</servlet-mapping>

4、注意事項
上傳圖片使用了fileupload組件,需要添加對應的jar包
jar包下載地址click here


注意!

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