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jsp+iframe+serverlet实现文件上传

2024-07-15 23:24:36   214人阅读

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:&nbsp;<input  name="gname"/><br /><br />类别:&nbsp;<input name="gtype"/><br /><br />价格:&nbsp;<input name="gprice"/><br /><br />数量:&nbsp;<input name="gnumber"/><br /><br />照片:&nbsp;<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:&nbsp;<textarea style="width: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

 


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