2种方式;
保存文件路径;
将文件写入数据库,使用blob字段
2. java实现文件的上传和下载
用输出流 接受 一个下载地址的网络流
然后将这个输出流 保存到本地一个文件 后缀与下载地址的后缀相同··
上传的话 将某个文件流 转成字节流 上传到某个webservice方法里
-------要代码来代码
URL url=new URL("http://www..com/1.rar");
URLConnection uc=url.openConnection();
InputStream in=uc.getInputStream();
BufferedInputStream bis=new BufferedInputStream(in);
FileOutputStream ft=new FileOutputStream("E://1.rar");
这是下载 上传太麻烦就不给写了
3. java如何实现文件上传
public static int transFile(InputStream in, OutputStream out, int fileSize) {
int receiveLen = 0;
final int bufSize = 1000;
try {
byte[] buf = new byte[bufSize];
int len = 0;
while(fileSize - receiveLen > bufSize)
{
len = in.read(buf);
out.write(buf, 0, len);
out.flush();
receiveLen += len;
System.out.println(len);
}
while(receiveLen < fileSize)
{
len = in.read(buf, 0, fileSize - receiveLen);
System.out.println(len);
out.write(buf, 0, len);
receiveLen += len;
out.flush();
}
} catch (IOException e) {
// TODO 自动生成 catch 块
e.printStackTrace();
}
return receiveLen;
}
这个方法从InputStream中读取内容，写到OutputStream中。
那么发送文件方，InputStream就是FileInputStream，OutputStream就是Socket.getOutputStream.
接受文件方，InputStream就是Socket.getInputStream,OutputStream就是FileOutputStream。
就OK了。 至于存到数据库里嘛，Oracle里用Blob。搜索一下，也是一样的。从Blob能获取一个输出流。
4. java中怎样上传文件
Java代码实现文件上传
FormFilefile=manform.getFile();
StringnewfileName=null;
Stringnewpathname=null;
StringfileAddre="/numUp";
try{
InputStreamstream=file.getInputStream();//把文件读入
StringfilePath=request.getRealPath(fileAddre);//取系统当前路径
Filefile1=newFile(filePath);//添加了自动创建目录的功能
((File)file1).mkdir();
newfileName=System.currentTimeMillis()
+file.getFileName().substring(
file.getFileName().lastIndexOf('.'));
ByteArrayOutputStreambaos=newByteArrayOutputStream();
OutputStreambos=newFileOutputStream(filePath+"/"
+newfileName);
newpathname=filePath+"/"+newfileName;
System.out.println(newpathname);
//建立一个上传文件的输出流
System.out.println(filePath+"/"+file.getFileName());
intbytesRead=0;
byte[]buffer=newbyte[8192];
while((bytesRead=stream.read(buffer,0,8192))!=-1){
bos.write(buffer,0,bytesRead);//将文件写入服务器
}
bos.close();
stream.close();
}catch(FileNotFoundExceptione){
e.printStackTrace();
}catch(IOExceptione){
e.printStackTrace();
}
5. java上传文件怎么弄
jsp: <input id="file" name="doc" type="file" style="position:absolute;filter:alpha(opacity=0);width:152px;height:120px;top:40px;left:10px" >
public String dbUpload(){
ActionContext ctx = ActionContext.getContext();
HttpServletRequest req = (HttpServletRequest) ctx.get(ServletActionContext.HTTP_REQUEST);
MultiPartRequestWrapper wrapper = (MultiPartRequestWrapper)req;
File doc =wrapper.getFile("doc");
String fileName=null;
if(doc!=null){
fileName="/"+String.valueOf(System.currentTimeMillis())+"."+wrapper.getContentTypes("doc")[0].substring(6);
try {
// String dri=req.getRealPath("img"); //代表图片上传的地方为img文件夹里
String dri=imagdirectory;
File target =new File(dri+fileName);
FileUtils.File(doc, target);
}catch(Exception e) {
e.printStackTrace();
}finally {
if(doc.exists()){
doc.delete();
}
}
}
return fileName;
}
6. 上传附件 java 代码
SmartUpload上传图片
记得下载jar包啊
别忘了把名改成smartUpload.jar
http://www.ciw.com.cn/blog/UploadFiles/2006-8/816529534.rar
Utility类：
package com.tidyinfo.utils;
import java.util.Calendar;
public class Utility {
//生成形如:\2006\08\18的路径
private String path;
//生成形如: 20060818125012的唯一id号
private String id;
//生成形如：/2006/08/18的路径
private String url;
private String hour;
private String year;
private String month;
private String day;
private String minate;
private String second;
/** Creates a new instance of Utility */
public Utility() {
this.year =new Integer(Calendar.getInstance().get(Calendar.YEAR)).toString();
this.month = parseToString(Calendar.getInstance().get(Calendar.MONTH)+1);
this.day = parseToString(Calendar.getInstance().get(Calendar.DAY_OF_MONTH));
this.hour = parseToString(Calendar.getInstance().get(Calendar.HOUR_OF_DAY));
this.minate = parseToString(Calendar.getInstance().get(Calendar.MINUTE));
this.second = parseToString(Calendar.getInstance().get(Calendar.SECOND));
this.setId();
this.setPath();
this.setUrl();
}
protected String parseToString(int i){
return i<10?("0"+i):new Integer(i).toString();
}
public String getId(){
return this.id;
}
public String getPath(){
return this.path;
}
public String getUrl(){
return this.url;
}
protected void setId(){
this.id = this.year+this.month+this.day+this.hour+this.minate+this.second;
}
protected void setPath(){
this.path = "\\"+this.year + "\\" + this.month + "\\" +
this.day ;
}
protected void setUrl(){
this.url = this.path.replace('\\','/');
}
}
Action：（根据不同情况要更改相关代码）
User userForm = new User();
String result = new String();
SmartUpload su = new SmartUpload();
//文件名
String filename = new String();
//文件扩展名
String fileext = new String();
//文件上传后存储的路径
String path = request.getRealPath(request.getContextPath());
path = path.substring(0,path.lastIndexOf("\\"));
path += "\\images";
//图片的url
String url = new String();
//创建文件夹
java.io.File file = new java.io.File(path);
file.mkdirs();
try{
// 上传初始化
su.initialize(this.servlet.getServletConfig(),request,response);
//设定上传限制
//1.限制每个上传照片的最大长度。
su.setMaxFileSize(5000000);
//2.限制总上传数据的长度。
su.setTotalMaxFileSize(10000000);
//3.设定允许上传的照片（通过扩展名限制）。
su.setAllowedFilesList("jpg,gif,GIF,JPG");
//上传照片
su.upload();
//获得请求的表单数据
String username = su.getRequest().getParameter("username");//username
String password = su.getRequest().getParameter("password");//password
String sex = su.getRequest().getParameter("sex");//sex
String email =su.getRequest().getParameter("email");//email
String apwd =su.getRequest().getParameter("apwd");//question of password
String rpwd =su.getRequest().getParameter("rpwd");//anser of password
userForm.setUsername(username);
userForm.setPassword(password);
userForm.setSex(sex);
userForm.setEmail(email);
userForm.setApwd(apwd);
userForm.setRpwd(rpwd);
//将上传照片全部保存到指定目录
if(!su.getFiles().getFile(0).isMissing()){
su.save(path,su.SAVE_PHYSICAL);
//文件名
filename = su.getFiles().getFile(0).getFileName();
//得到扩展名
fileext = su.getFiles().getFile(0).getFileExt();
//给图片改名，命名形如：20060814135411.gif
Utility u = new Utility();
String newName = u.getId()+"."+fileext;
java.io.File oldFile = new java.io.File(path+"\\"+filename);
java.io.File newFile = new java.io.File( path + "\\"+newName);
//上传图片的url
url = request.getContextPath()+"/images/"+newName;
if(oldFile!=null){
oldFile.renameTo(newFile);
}else{
result+="命名出错！";
}
System.out.println("0000000000000000000"+filename);
System.out.println("0000000000000000000"+path+"\\"+newName);
System.out.println("0000000000000000000"+url);
System.out.println(result);
}
}catch(com.jspsmart.upload.SmartUploadException e){
result += "file出错信息：";
result += e.getMessage();
System.out.println(result);
}
7. java实现文件上传，代码尽量简洁~~~~~·
普通方法实现任意上传？本地文件？本地文件直接用FileInputStream即可。
jspsmartupload需要在提交的form表单中添加一个属性，具体内容忘了=。=
8. java：上传附件功能，点击上传，上传成功后还在本页面，问附件的路径怎么才能保存下来不清空求解啊谢谢了
您好，这样：第一,jsp上传页面内容:
<%@ page contentType="text/html; charset=GBK" %>
<%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html" %>
<html>
<head>
<title>
jsp1
</title>
</head>
<body bgcolor="#ffffff">
<html:form action="myupload.do" method="post" enctype="multipart/form-data">
<html:file property="thisFile"/><br>
<html:file property="thisFile"/><br>
<html:submit/>
</html:form>
</body>
</html>
第二,一个javabean
package upload;
import org.apache.struts.action.ActionForm;
import org.apache.struts.upload.FormFile;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionMapping;
import javax.servlet.http.HttpServletRequest;
public class FileInfo extends ActionForm {
private FormFile thisFile;
public FormFile getThisFile() {
return thisFile;
}
public void setThisFile(FormFile thisFile) {
this.thisFile = thisFile;
}
public ActionErrors validate(ActionMapping actionMapping,
HttpServletRequest httpServletRequest) {
/** @todo: finish this method, this is just the skeleton.*/
return null;
}
public void reset(ActionMapping actionMapping,
HttpServletRequest servletRequest) {
}
}
第三,一个action
package upload;
import java.io.*;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionForm;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.Action;
import org.apache.struts.upload.FormFile;
public class myupload extends Action {
public ActionForward execute(ActionMapping actionMapping,
ActionForm actionForm,
HttpServletRequest request,
HttpServletResponse response) throws
FileNotFoundException, IOException {
FileInfo fileInfo = (FileInfo) actionForm;
//获取上传文件
FormFile f=fileInfo.getThisFile();
InputStream is=f.getInputStream();
//将文件存入服务器上
String filename=request.getSession().getServletContext().getRealPath("/shangchuan/"+f.getFileName());
OutputStream os=new FileOutputStream(filename);
int x=0;
//优化流处理过程
byte[] buffer = new byte[8192];
while((x=is.read(buffer, 0, 8192))!=-1)
{
os.write(buffer,0,x);
}
os.close();
response.sendRedirect("jsp1.jsp");//根据实际情况跳转
return null;
}
}
9. java 上传附件实现方法
上传附件，实际上就是将文件存储到远程服务器，进行临时存储。举例：
**
* 上传文件
*
* @param fileName
* @param plainFilePath 文件路径路径
* @param filepath
* @return
* @throws Exception
*/
public static String fileUploadByFtp(String plainFilePath, String fileName, String filepath) throws Exception {
FileInputStream fis = null;
ByteArrayOutputStream bos = null;
FTPClient ftpClient = new FTPClient();
String bl = "false";
try {
fis = new FileInputStream(plainFilePath);
bos = new ByteArrayOutputStream(fis.available());
byte[] buffer = new byte[1024];
int count = 0;
while ((count = fis.read(buffer)) != -1) {
bos.write(buffer, 0, count);
}
bos.flush();
Log.info("加密上传文件开始");
Log.info("连接远程上传服务器"+CCFCCBUtil.CCFCCBHOSTNAME+":"+22);
ftpClient.connect(CCFCCBUtil.CCFCCBHOSTNAME, 22);
ftpClient.login(CCFCCBUtil.CCFCCBLOGINNAME, CCFCCBUtil.CCFCCBLOGINPASSWORD);
FTPFile[] fs;
fs = ftpClient.listFiles();
for (FTPFile ff : fs) {
if (ff.getName().equals(filepath)) {
bl="true";
ftpClient.changeWorkingDirectory("/"+filepath+"");
}
}
Log.info("检查文件路径是否存在：/"+filepath);
if("false".equals(bl)){
ViewUtil.dataSEErrorPerformedCommon( "查询文件路径不存在："+"/"+filepath);
return bl;
}
ftpClient.setBufferSize(1024);
ftpClient.setControlEncoding("GBK");
// 设置文件类型（二进制）
ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE);
ftpClient.storeFile(fileName, fis);
Log.info("上传文件成功："+fileName+"。文件保存路径："+"/"+filepath+"/");
return bl;
} catch (Exception e) {
throw e;
} finally {
if (fis != null) {
try {
fis.close();
} catch (Exception e) {
Log.info(e.getLocalizedMessage(), e);
}
}
if (bos != null) {
try {
bos.close();
} catch (Exception e) {
Log.info(e.getLocalizedMessage(), e);
}
}
}
}
备注：只需要修改上传的服务器地址、用户名、密码即可进行服务器访问上传。根据实际需要修改即可。