图片的上传
Posted 西瓜的小弟西西瓜
tags:
篇首语：本文由小常识网(cha138.com)小编为大家整理，主要介绍了图片的上传相关的知识，希望对你有一定的参考价值。
一：需要的jar包
commons—io.jar
commons—fileupload.jar这个包对io有依赖
二：上传三部曲
相关类：
工厂：DiskFileItemFactory
解析器：ServletFileUpload
表单项：FileItem
1)创建工厂
DiskFileItemFactory factory = new DiskFileItemFactory ();
2)创建解析器
ServletFileUpload servletFileUpload = new ServletFileUpload(factory);
3)使用解析器来解析request，得到FileItem集合
List<FileItem> fileItem = servletFileUpload.parseRequest(request);
三：源码
1.jsp
<%-- Created by IntelliJ IDEA. User: YuWenHui Date: 2017/4/12 0012 Time: 14:00 To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> <html> <head> <title>上传图片</title> </head> <body> <h1>上传1</h1> <form action="<c:url value=‘/FileUploadServlet‘/>" method="post" enctype="multipart/form-data"> 用户名；<input type="text" name="username"/><br/> 照 片：<input type="file" name="zhaoPian"/><br/> <input type="submit" value="上传"/> </form> </body> </html>
2：配置文件
servlet>
<servlet-name>FileUploadServlet</servlet-name>
<servlet-class>servlet.FileUploadServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>FileUploadServlet</servlet-name>
<url-pattern>/FileUploadServlet</url-pattern>
</servlet-mapping>
3:servlet
package servlet; 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 java.io.File; import java.io.IOException; import java.util.List; /** * Created by YuWenHui on 2017/4/12 0012. */ public class FileUploadServlet extends javax.servlet.http.HttpServlet { protected void doPost(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) throws javax.servlet.ServletException, IOException { request.setCharacterEncoding("utf-8"); response.setContentType("text/html;charset=utf-8"); // 得到工厂 DiskFileItemFactory diskFileItemFactory=new DiskFileItemFactory(); // 创建解析器 ServletFileUpload servletFileUpload =new ServletFileUpload(diskFileItemFactory); // 得到FIleItem集合 try { List<FileItem> fileItemList = servletFileUpload.parseRequest(request); FileItem fileItem1 = fileItemList.get(0); FileItem fileItem2 = fileItemList.get(1); // 演示普通表单项 System.out.println("普通表单项："+fileItem1.getFieldName()+":"+fileItem1.getString("utf-8")); // 演示文件表单项 System.out.println("文件表单项目演示："); System.out.println("ContentType："+fileItem2.getContentType()); System.out.println("名称："+fileItem2.getName()); System.out.println("size:"+fileItem2.getSize()); // 创建一个文件,这里的文件目录就是上传文件的真实路径 File distFile = new File("E:/JavaWebSrc/FileUpload/destFile.jpg"); // 保存文件 fileItem2.write(distFile); } catch (FileUploadException e) { throw new RuntimeException(e); } catch (Exception e) { throw new RuntimeException(e); } } protected void doGet(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) throws javax.servlet.ServletException, IOException { } }
以上是关于图片的上传的主要内容，如果未能解决你的问题，请参考以下文章