实现文件上传我想大家也都会
这是jsp页面的代码
index.jsp
<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>Insert title here</title> </head> <body> <table> <tr> <td colspan="2" align="center"> 商品添加 </td> </tr> <tr> <td> <form action="Iframe.jsp" target="My_Iframe" method="post"> 名称: <input name="gname"/><br /><br /> 类别: <input name="gtype"/><br /><br /> 价格: <input name="gprice"/><br /><br /> 数量: <input name="gnumber"/><br /><br /> 照片: <input id="photo" name="gphoto"/><br /><br /> </td> <td > <iframe name="My_Iframe" src="Iframe.jsp?filename=1407170231464.jpg" style="height:180px"> </iframe> </td> </tr> <tr> <td colspan="2"> 描述: <textarea style="450px" cols="30" rows="5"></textarea> </td> </tr> </table> </form> </body> </html>
这是iframe框架所引用的界面
Iframe.jsp
<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>Insert title here</title> </head> <% String path = request.getContextPath(); String filename = request.getParameter("filename"); String image = path+"/"+filename; // if(image==null||image=="") // { // image=path+"/"+"1407170231464.jpg"; // } System.out.print(image); %> <body onload="returnParent()"> <img src="<%=image %>" width="100px" height="100px"/> <input id="image1" value="<%=filename %>" type="hidden"/> <form action="image" method="post" enctype="multipart/form-data"> <input type="file" name="goodsImage" /> <input type="submit" value="上传" /> </form> <script type="text/javascript"> function returnParent() { var frameValue = document.getElementById("image1").value; //window表示当前的页面 //window.parent表示获取到父窗体 window.parent.document.getElementById("photo").value = frameValue; } </script> </body> </html>
这里学到了新知识就是将iframe窗体中的某个元素的值赋给父窗体
var frameValue = document.getElementById("image1").value;
//window表示当前的页面
//window.parent表示获取到父窗体
window.parent.document.getElementById("photo").value = frameValue;
下面的这个是iframe内点击上传时 anction所对应的Serverlet代码
imageservlets.java
package com.shxt.lesson16homework.Servlets; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.commons.fileupload.FileItemIterator; import org.apache.commons.fileupload.FileItemStream; import org.apache.commons.fileupload.disk.DiskFileItemFactory; import org.apache.commons.fileupload.servlet.ServletFileUpload; public class imageservlets extends HttpServlet { protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setCharacterEncoding("utf-8"); try{ DiskFileItemFactory factory = new DiskFileItemFactory(); ServletFileUpload upload = new ServletFileUpload(factory); FileItemIterator iter = upload.getItemIterator(request); FileItemStream stream = iter.next(); //获取到文件（流默认是闭合的） InputStream input = stream.openStream(); //openStream方法将流打开，转化为标准的InputStream（字节流） // File f = new File(input); // FileInputStream fs = new FileInputStream(input); // String filename=stream.getName(); // // String kzm = filename.substring(filename.length()-4); //文件名称 String tomcatPath = request.getSession().getServletContext().getRealPath("/"); String imgname= new java.util.Date().getTime()+".jpg"; String newfilename =tomcatPath+"/"+ imgname; File file = new File(newfilename); FileOutputStream output = new FileOutputStream(file); byte[] buffer = new byte[1024]; //字节数组类型的缓冲区 while (true) { //输入流input指向源，从源中读取数据，暂时存储在buffer中 int count1 = input.read(buffer); System.out.println(count1); if (count1 == -1) { break; } //输出流output指向目标，向目标写入数据，数据从buffer中获取 output.write(buffer, 0, count1); } //System.out.print(kzm); response.sendRedirect("Iframe.jsp?filename="+imgname); }catch(Exception e){ e.printStackTrace(); } } }
Serverlet处理上传文件时引入了3个包
commons-fileupload-1.2.2.jar commons-io-2.0.1.jar commons-logging.jar