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文件上傳伺服器代碼

發布時間:2021-01-01 16:27:24

1、java中怎麼把文件上傳到伺服器的指定路徑?

文件從本地到伺服器的功能,其實是為了解決目前瀏覽器不支持獲取本地文件全路徑。不得已而想到上傳到伺服器的固定目錄,從而方便項目獲取文件,進而使程序支持EXCEL批量導入數據。

java中文件上傳到伺服器的指定路徑的代碼:

在前台界面中輸入:

<form method="post" enctype="multipart/form-data"  action="../manage/excelImport.do">

請選文件:<input type="file"  name="excelFile">

<input type="submit" value="導入" onclick="return impExcel();"/>

</form>

action中獲取前台傳來數據並保存

/**

* excel 導入文件

* @return

* @throws IOException

*/

@RequestMapping("/usermanager/excelImport.do")

public String excelImport(

String filePath,

MultipartFile  excelFile,HttpServletRequest request) throws IOException{

log.info("<<<<<<action:{} Method:{} start>>>>>>","usermanager","excelImport" );

if (excelFile != null){

String filename=excelFile.getOriginalFilename();

String a=request.getRealPath("u/cms/www/201509");

SaveFileFromInputStream(excelFile.getInputStream(),request.getRealPath("u/cms/www/201509"),filename);//保存到伺服器的路徑

}

log.info("<<<<<<action:{} Method:{} end>>>>>>","usermanager","excelImport" );

return "";

}

/**

* 將MultipartFile轉化為file並保存到伺服器上的某地

*/

public void SaveFileFromInputStream(InputStream stream,String path,String savefile) throws IOException

{  

FileOutputStream fs=new FileOutputStream( path + "/"+ savefile);

System.out.println("------------"+path + "/"+ savefile);

byte[] buffer =new byte[1024*1024];

int bytesum = 0;

int byteread = 0;

while ((byteread=stream.read(buffer))!=-1)

{

bytesum+=byteread;

fs.write(buffer,0,byteread);

fs.flush();

}

fs.close();

stream.close();

}

2、如何文件上傳至伺服器某一目錄下

common-fileupload是jakarta項目組開發的一個功能很強大的上傳文件組件
下面先介紹上傳文件到伺服器(多文件上傳):
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
import java.util.regex.*;
import org.apache.commons.fileupload.*;

public class upload extends HttpServlet {
private static final String CONTENT_TYPE = "text/html; charset=GB2312";
//Process the HTTP Post request
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType(CONTENT_TYPE);
PrintWriter out=response.getWriter();
try {
DiskFileUpload fu = new DiskFileUpload();
// 設置允許用戶上傳文件大小,單位:位元組,這里設為2m
fu.setSizeMax(2*1024*1024);
// 設置最多隻允許在內存中存儲的數據,單位:位元組
fu.setSizeThreshold(4096);
// 設置一旦文件大小超過getSizeThreshold()的值時數據存放在硬碟的目錄
fu.setRepositoryPath("c://windows//temp");
//開始讀取上傳信息
List fileItems = fu.parseRequest(request);
// 依次處理每個上傳的文件
Iterator iter = fileItems.iterator();
//正則匹配,過濾路徑取文件名
String regExp=".+////(.+)$";
//過濾掉的文件類型
String[] errorType={".exe",".com",".cgi",".asp"};
Pattern p = Pattern.compile(regExp);
while (iter.hasNext()) {
FileItem item = (FileItem)iter.next();
//忽略其他不是文件域的所有表單信息
if (!item.isFormField()) {
String name = item.getName();
long size = item.getSize();
if((name==null||name.equals("")) && size==0)
continue;
Matcher m = p.matcher(name);
boolean result = m.find();
if (result){
for (int temp=0;temp<ERRORTYPE.LENGTH;TEMP++){
if (m.group(1).endsWith(errorType[temp])){
throw new IOException(name+": wrong type");
}
}
try{
//保存上傳的文件到指定的目錄
//在下文中上傳文件至資料庫時,將對這里改寫
item.write(new File("d://" + m.group(1)));
out.print(name+" "+size+"");
}
catch(Exception e){
out.println(e);
}
}
else
{
throw new IOException("fail to upload");
}
}
}
}
catch (IOException e){
out.println(e);
}
catch (FileUploadException e){
out.println(e);
}

}
}
現在介紹上傳文件到伺服器,下面只寫出相關代碼:
以sql2000為例,表結構如下:
欄位名:name filecode
類型: varchar image
資料庫插入代碼為:PreparedStatement pstmt=conn.prepareStatement("insert into test values(?,?)");
代碼如下:
。。。。。。
try{
這段代碼如果不去掉,將一同寫入到伺服器中
//item.write(new File("d://" + m.group(1)));

int byteread=0;
//讀取輸入流,也就是上傳的文件內容
InputStream inStream=item.getInputStream();
pstmt.setString(1,m.group(1));
pstmt.setBinaryStream(2,inStream,(int)size);
pstmt.executeUpdate();
inStream.close();
out.println(name+" "+size+" ");
}
。。。。。。
這樣就實現了上傳文件至資料庫

3、如何實現上傳文件到伺服器

common-fileupload是jakarta項目組開發的一個功能很強大的上傳文件組件
下面先介紹上傳文件到伺服器(多文件上傳):
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
import java.util.regex.*;
import org.apache.commons.fileupload.*;

public class upload extends HttpServlet {
private static final String CONTENT_TYPE = "text/html; charset=GB2312";
//Process the HTTP Post request
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType(CONTENT_TYPE);
PrintWriter out=response.getWriter();
try {
DiskFileUpload fu = new DiskFileUpload();
// 設置允許用戶上傳文件大小,單位:位元組,這里設為2m
fu.setSizeMax(2*1024*1024);
// 設置最多隻允許在內存中存儲的數據,單位:位元組
fu.setSizeThreshold(4096);
// 設置一旦文件大小超過getSizeThreshold()的值時數據存放在硬碟的目錄
fu.setRepositoryPath("c://windows//temp");
//開始讀取上傳信息
List fileItems = fu.parseRequest(request);
// 依次處理每個上傳的文件
Iterator iter = fileItems.iterator();
//正則匹配,過濾路徑取文件名
String regExp=".+////(.+)$";
//過濾掉的文件類型
String[] errorType={".exe",".com",".cgi",".asp"};
Pattern p = Pattern.compile(regExp);
while (iter.hasNext()) {
FileItem item = (FileItem)iter.next();
//忽略其他不是文件域的所有表單信息
if (!item.isFormField()) {
String name = item.getName();
long size = item.getSize();
if((name==null||name.equals("")) && size==0)
continue;
Matcher m = p.matcher(name);
boolean result = m.find();
if (result){
for (int temp=0;temp<ERRORTYPE.LENGTH;TEMP++){
if (m.group(1).endsWith(errorType[temp])){
throw new IOException(name+": wrong type");
}
}
try{
//保存上傳的文件到指定的目錄
//在下文中上傳文件至資料庫時,將對這里改寫
item.write(new File("d://" + m.group(1)));
out.print(name+" "+size+"");
}
catch(Exception e){
out.println(e);
}
}
else
{
throw new IOException("fail to upload");
}
}
}
}
catch (IOException e){
out.println(e);
}
catch (FileUploadException e){
out.println(e);
}

}
}
現在介紹上傳文件到伺服器,下面只寫出相關代碼:
以sql2000為例,表結構如下:
欄位名:name filecode
類型: varchar image
資料庫插入代碼為:PreparedStatement pstmt=conn.prepareStatement("insert into test values(?,?)");
代碼如下:
。。。。。。
try{
這段代碼如果不去掉,將一同寫入到伺服器中
//item.write(new File("d://" + m.group(1)));

int byteread=0;
//讀取輸入流,也就是上傳的文件內容
InputStream inStream=item.getInputStream();
pstmt.setString(1,m.group(1));
pstmt.setBinaryStream(2,inStream,(int)size);
pstmt.executeUpdate();
inStream.close();
out.println(name+" "+size+" ");
}
。。。。。。
這樣就實現了上傳文件至資料庫

4、asp上傳文件到伺服器的代碼怎麼寫?

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>無標題文檔</title>
</head>
<body>
<%
'On Error Resume Next
Response.Expires=0
if Request.TotalBytes then
set a=createobject("adodb.stream")
a.Type=1
a.Open
a.write Request.BinaryRead(Request.TotalBytes)
a.Position=0
b=a.Read
c=chrB(13)&chrB(10)
d=clng(instrb(b,c))
e=instrb(d+1,b,c)
set f=createobject("adodb.stream")
f.type=1
f.open
a.Position=d+1
a.copyto f,e-d-3
f.Position=0
f.type=2
f.CharSet="GB2312"
g=f.readtext
f.Close
h=mid(g,instrRev(g,"\")+1,e)
i=instrb(b,c&c)+4
j=instrb(i+1,b,leftB(b,d-1))-i-2
if j <1 then
set f =nothing
set a =nothing
response.write "未選擇要上傳的文件<a href='?'>重新上傳</a>"
response.end
end if
f.Type=1
f.Open
a.Position=i-1
a.CopyTo f,j

h = Mid(h, InStrRev(h, "filename=""") + 10) '這是我幫你添加的,文件名的獲取沒有正確
f.SaveToFile server.mappath("/EXCEL/"& h),2
f.Close
set f=Nothing
a.Close
set a=Nothing
'response.write "<a href="&Server.URlEncode(h)&">"&h&"</a>"
end if
If Err.number<> 0 Then
response.Write err.number
response.Write err.Description
Response.End
End If
%>
<script language="javascript">
function checkupload() {
if (document.upload_form.fe.value == "") {
alert("未選擇要上傳的文件");
return false;
}
}
</script>
<form name="upload_form" enctype="multipart/form-data" method="post" onsubmit="return(checkupload())">
<input type="file" name="fe"/>
<input type="submit" value="上傳" name="B1"/>
</form>
</body>
</html>

5、asp上傳文件到伺服器的代碼怎麼寫呢。。。。。。

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>無標題文檔</title>
</head>
<body>
<%
'On Error Resume Next
Response.Expires=0
if Request.TotalBytes then
set a=createobject("adodb.stream")
a.Type=1
a.Open
a.write Request.BinaryRead(Request.TotalBytes)
a.Position=0
b=a.Read
c=chrB(13)&chrB(10)
d=clng(instrb(b,c))
e=instrb(d+1,b,c)
set f=createobject("adodb.stream")
f.type=1
f.open
a.Position=d+1
a.copyto f,e-d-3
f.Position=0
f.type=2
f.CharSet="GB2312"
g=f.readtext
f.Close
h=mid(g,instrRev(g,"\")+1,e)
i=instrb(b,c&c)+4
j=instrb(i+1,b,leftB(b,d-1))-i-2
if j <1 then
set f =nothing
set a =nothing
response.write "未選擇要上傳的文件<a href='?'>重新上傳</a>"
response.end
end if
f.Type=1
f.Open
a.Position=i-1
a.CopyTo f,j

h = Mid(h, InStrRev(h, "filename=""") + 10) '這是我幫你添加的,文件名的獲取沒有正確
f.SaveToFile server.mappath("/EXCEL/"& h),2
f.Close
set f=Nothing
a.Close
set a=Nothing
'response.write "<a href="&Server.URlEncode(h)&">"&h&"</a>"
end if
If Err.number<> 0 Then
response.Write err.number
response.Write err.Description
Response.End
End If
%>
<script language="javascript">
function checkupload() {
if (document.upload_form.fe.value == "") {
alert("未選擇要上傳的文件");
return false;
}
}
</script>
<form name="upload_form" enctype="multipart/form-data" method="post" onsubmit="return(checkupload())">
<input type="file" name="fe"/>
<input type="submit" value="上傳" name="B1"/>
</form>
</body>
</html>

6、求上傳圖片到伺服器上文件夾的代碼

t1.htm:

<center>
<form name=x0 method=post ENCTYPE="multipart/form-data" action="http://xxxxxxx..../t1.asp">
<input type=file name="f1">
<input type=submit name=b1 value="上傳圖片">
</form>

t1.asp:

<%
Set str=Server.CreateObject("adodb.stream")
str.Type=1
str.Mode=3
str.Open
Set dec=Server.CreateObject("adodb.stream")
dec.Type=1
dec.Mode=3
dec.Open
str.write Request.BinaryRead(Request.TotalBytes)
str.position=0
sa1=str.Read
'''''''''''''
h1=chrb(13)&chrb(10)
t0=InStrB(sa1,h1 & h1)+4
if InStrB(sa1,h1)>0 then
tz=LeftB(sa1,InStrB(sa1,h1)-1)
end if
tt=InStrB(t0+1,sa1,tz)-t0-2
str.position=t0-1
str.copyto dec,tt
wj="c:\1.jpg" '指定文件路徑及文件名
dec.SaveToFile wj,2 '生成文件
%>
<%="OK!"%>

7、java 求jsp上傳圖片到伺服器代碼

提交頁面表單
<form action="up.jsp" enctype="multipart/form-data" method="post">
<input type="file" name="file">
<input type="submit" value="確定">
</form>
上傳頁面up.jsp
<%@page import="java.io.FileWriter"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
import="java.io.*"
pageEncoding="UTF-8"%>
<%
/**
協議頭四行內容
45 -----------------------------7de231211204c4
80 Content-Disposition: form-data; name="file"; filename="xx.txt"
26 Content-Type: text/plain
2
標記文件結尾
-----------------------------7de231211204c4--
**/
ServletInputStream sin = request.getInputStream();
byte[] buffer = new byte[1024 * 8];
int length = 0, row = 0;
String mark = "";
String filename = "";
while ((length = sin.readLine(buffer, 0, buffer.length)) > 0) {
out.println(length + " " + new String(buffer, 0, length, "UTF-8") + "<br>");
String s = new String(buffer, 0, length, "UTF-8");
if (row == 0)
mark = s.trim();
else if (s.indexOf("filename=") > 0) {
int end = s.lastIndexOf("\"");
int start = s.substring(0, end).lastIndexOf("\"");
filename = s.substring(start + 1, end);
} else if ("".equals(s.trim()))
break;
row ++;
}

out.println("filename: " + filename + "<br>");
filename = request.getRealPath("/") + "../" + filename;
FileOutputStream fout = new FileOutputStream(filename);
while ((length = sin.readLine(buffer, 0, buffer.length)) > 0) {
String s = new String(buffer, 0, length);
if (s.startsWith(mark))
break;
fout.write(buffer, 0, length);
}
fout.flush();
fout.close();
File f = new File(filename);
out.println(f.exists());
out.println(f.getAbsolutePath());
%>

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