在jsp页面上怎么用Java语言实现图片上传
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发布时间：2022-05-15 07:11
共3个回答
热心网友
时间：2022-04-24 07:07
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<%@ page contentType="text/html;charset=gb2312"%>
<html><title><%= application.getServerInfo() %></title>
<body>
上传文件
<form action="doUpload.jsp" method="post" enctype="multipart/form-data">
<%-- 类型enctype用multipart/form-data，
这样可以把文件中的数据作为流式数据上传，不管是什么文件类型，均可上传。--%>
请选择要上传的文件
<input type="file" name="upfile" size="50">
<input type="submit" value="提交">
</form></body>
</html>
----doUpload.jsp
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://"
+ request.getServerName() + ":" + request.getServerPort()
+ path + "/";
%>
<%@ page contentType="text/html; charset=GBK"%>
<%@ page import="java.io.*"%>
<%@ page import="java.util.*"%>
<%@ page import="javax.servlet.*"%>
<%@ page import="javax.servlet.http.*"%>
<html>
<head>
<title>upFile</title>
</head>
<body bgcolor="#ffffff">
<%
//定义上载文件的最大字节
int MAX_SIZE = 102400 * 102400;
//创建根路径的保存变量
String rootPath;
//声明文件读入类
DataInputStream in = null;
FileOutputStream fileOut = null;
//取得客户端的网络地址
String remoteAddr = request.getRemoteAddr();
//获得服务器的名字
String serverName = request.getServerName();
//取得互联网程序的绝对地址
String realPath = request.getRealPath(serverName);
realPath = realPath.substring(0, realPath.lastIndexOf("\\"));
//创建文件的保存目录
rootPath = realPath + "\\upload\\";
//取得客户端上传的数据类型
String contentType = request.getContentType();
try {
if (contentType.indexOf("multipart/form-data") >= 0) {
//读入上传的数据
in = new DataInputStream(request.getInputStream());
int formDataLength = request.getContentLength();
if (formDataLength > MAX_SIZE) {
out.println("<P>上传的文件字节数不可以超过" + MAX_SIZE + "</p>");
return;
}
//保存上传文件的数据
byte dataBytes[] = new byte[formDataLength];
int byteRead = 0;
int totalBytesRead = 0;
//上传的数据保存在byte数组
while (totalBytesRead < formDataLength) {
byteRead = in.read(dataBytes, totalBytesRead,
formDataLength);
totalBytesRead += byteRead;
}
//根据byte数组创建字符串
String file = new String(dataBytes);
//out.println(file);
//取得上传的数据的文件名
String saveFile = file.substring(file
.indexOf("filename=\"") + 10);
saveFile = saveFile.substring(0, saveFile.indexOf("\n"));
saveFile = saveFile.substring(
saveFile.lastIndexOf("\\") + 1, saveFile
.indexOf("\""));
int lastIndex = contentType.lastIndexOf("=");
//取得数据的分隔字符串
String boundary = contentType.substring(lastIndex + 1,
contentType.length());
//创建保存路径的文件名
String fileName = rootPath + saveFile;//out.print(fileName);
int pos;
pos = file.indexOf("filename=\"");
pos = file.indexOf("\n", pos) + 1;
pos = file.indexOf("\n", pos) + 1;
pos = file.indexOf("\n", pos) + 1;
int boundaryLocation = file.indexOf(boundary, pos) - 4;
//out.println(boundaryLocation);
//取得文件数据的开始的位置
int startPos = ((file.substring(0, pos)).getBytes()).length;
//out.println(startPos);
//取得文件数据的结束的位置
int endPos = ((file.substring(0, boundaryLocation))
.getBytes()).length;
//out.println(endPos);
//检查上载文件是否存在
File checkFile = new File(fileName);
if (checkFile.exists()) {
out.println("<p>" + saveFile + "文件已经存在.</p>");
}
//检查上载文件的目录是否存在
File fileDir = new File(rootPath);
if (!fileDir.exists()) {
fileDir.mkdirs();
}
//创建文件的写出类
fileOut = new FileOutputStream(fileName);
//保存文件的数据
fileOut.write(dataBytes, startPos, (endPos - startPos));
fileOut.close();
out.println(saveFile + "文件成功上载.</p>");
request.getSession().setAttribute("fileName",saveFile);
} else {
String content = request.getContentType();
out.println("<p>上传的数据类型不是multipart/form-data</p>");
}
} catch (Exception ex) {
throw new ServletException(ex.getMessage());
}
%>
</body>
</html>
热心网友
时间：2022-04-24 08:25
<%@ page contentType="text/html; charset=gbk" language="java" import="java.sql.*" errorPage="" pageEncoding="gbk"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%@ page import="com.jspsmart.upload.*,com.eaio.uuid.UUID"%>
<%@ page import="org.vm.common.util.*"%>
<%!
String path="";
boolean isupload=false;
String cmd=null;
String fileName="";
%>
<%
cmd="";
isupload=false;
SmartUpload su=null;
String target=request.getParameter("target");//
String savePath="/soft/markets/000/upload/card/";
//FileUtils.createFolder(savePath);
try{
su=new SmartUpload();
su.initialize(pageContext);
su.setAllowedFilesList("jpg,gif,jpeg,bmp,JPG,GIF,JPEG,BMP");
su.setDeniedFilesList("exe,bat,jsp,asp,aspx,php,htm,html,doc,txt");
//单个文件最大*
su.setMaxFileSize(10240000);
su.upload();
cmd=su.getRequest().getParameter("cmd");
}catch(Exception e)
{
}
if(cmd!=null&&cmd.equals("ok"))
{
//out.println("in upload");
//执行上传操作
com.jspsmart.upload.File file=su.getFiles().getFile(0);
if(file.isMissing())
{
out.println("文件上传失败！");
out.close();
}
else
{
//上传成功
//fileName = System.currentTimeMillis()+"-"+file.getFileName();
String ext=file.getFileExt();
fileName = new UUID().toString()+(ext!=null?"."+ext:"");
try{
path=savePath+fileName;
file.saveAs(path,su.SAVE_VIRTUAL);
isupload=true;
}catch(Exception e){
out.println("fail"+e.getMessage());
try{out.close();}catch(Exception ex){}
}
}
}
%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gbk" />
<%@ include file="../../../../../../check.jsp"%>
<%@ include file="../../../../../../public/js/script.jsp"%>
<link href="../../css/master.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript">
function chkForm()
{
var obj=document.all.form1;
if(obj.file.value=="")
{
alert("没有文件上传！");
return false;
}
return confirm("真的要上传吗？");
}
<% if(isupload) {%>
alert("上传成功！");
cnmarket.closeDialog({filename:"<%=fileName%>"});
<% } %>
</script>
<title></title>
</head>
<body style="height:100px;">
<form action="" method="post" id="form1" name="form1" enctype="multipart/form-data" onSubmit="return chkForm();">
<table width="100%" height="100%" border="0" cellspacing="1" class="listTable">
<input type="hidden" name="cmd" value="ok">
<tr class="listOdd">
<td width="14%" height="20" align="right"><p align="right">上传文件：</p></td>
<td width="50%"><p align="left"><input name="file" id="file" type="file" /></p></td>
</tr>
<tr class="listDual">
<td colspan="2">
<input type="submit" class="dataBtn" value="上传"/>
<input type="button" class="dataBtn" value="关闭" onclick="cnmarket.closeDialog(true)"/>
</td>
</tr>
</table>
</form>
</body>
</html>
其他页面调用这个页面。。。。
<script language="javascript">
upload = function(){
cnmarket.uploadFile("fitment.enclosure",null,null,function(data){
if(data["filename"]){
document.getElementById("fitment.enclosure").value=data["filename"];
}
});
}
</script>
<input name="fitment.enclosure" type="text" class="inpt2" readOnly value="<c:out value="${fitment.enclosure}"/>">
<input type="button" class="dataBtn" value="上传" onclick="upload();"/>
热心网友
时间：2022-04-24 09:59
