我是java的新手。我正在尝试在jsp页面上调用java函数。该函数应该将文件从一个目录复制到另一个目录。通过Jsp我必须浏览ahd选择一个文件..在此之后，我必须单击运行按钮然后它应该执行我在java程序中给出的操作。如何在jsp调用这个java程序..请帮帮我..
Java代码：
package copy;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
public class CopyDirectoryExample {
public static void main(String[] args) {
File srcFolder = new File("D:\\CETAF");
File destFolder = new File("C:\\ExecFolder");
//make sure source exists
if(!srcFolder.exists()){
System.out.println("Directory does not exist.");
//just exit
System.exit(0);
} else {
try {
copyFolder(srcFolder,destFolder);
} catch(IOException e) {
e.printStackTrace();
//error, just exit
System.exit(0);
}
}
System.out.println("Done");
}
public static void copyFolder(File src, File dest) throws IOException {
if(src.isDirectory()) {
//if directory not exists, create it
if(!dest.exists()){
dest.mkdir();
System.out.println("Directory copied from "
+ src + " to " + dest);
}
//list all the directory contents
String files[] = src.list();
for (String file : files) {
//construct the src and dest file structure
File srcFile = new File(src, file);
File destFile = new File(dest, file);
//recursive copy
copyFolder(srcFile,destFile);
}
} else {
//if file, then copy it
//Use bytes stream to support all file types
InputStream in = new FileInputStream(src);
OutputStream out = new FileOutputStream(dest);
byte[] buffer = new byte[1024];
int length;
//copy the file content in bytes
while ((length = in.read(buffer)) > 0){
out.write(buffer, 0, length);
}
in.close();
out.close();
System.out.println("File copied from " + src + " to " + dest);
}
}
}
的index.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<HTML><HEAD><TITLE>Display file upload form to the user</TITLE>
</HEAD>
<BODY>
<FORM ENCTYPE="multipart/form-data" ACTION="upload.jsp" METHOD=POST>
<br>
<br>
<br>
<center>
<table border="0" >
<tr>
<center>
<td colspan="2" align="center"><B>UPLOAD THE FILE</B>
<center>
</td>
</tr>
<tr>
<td colspan="2" align="center"></td>
</tr>
<tr>
<td><b>Choose the file To Upload:</b></td>
<td><INPUT NAME="file" TYPE="file"></td>
</tr>
<tr>
<td colspan="2" align="center"></td>
</tr>
<tr>
<td colspan="2" align="center"><input type="submit"
value="RUN"></td>
</tr>
</table>
</center>
</FORM>
</BODY>
</HTML>
Upload.jsp
<%@ page import="java.io.*"%>
<% String saveFile = "";
String contentType = request.getContentType();
if ((contentType != null) && (contentType.indexOf
("multipart/form-data") >= 0)) {
DataInputStream in = new DataInputStream(request.getInputStream());
int formDataLength = request.getContentLength();
byte dataBytes[] = new byte[formDataLength];
int byteRead = 0;
int totalBytesRead = 0;
while (totalBytesRead < formDataLength) {
byteRead = in.read(dataBytes, totalBytesRead, formDataLength);
totalBytesRead += byteRead;
}
String file = new String(dataBytes);
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("=");
String boundary = contentType.substring(lastIndex+ 1, contentType.length());
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;
int startPos = ((file.substring(0, pos)).getBytes()).length;
int endPos = ((file.substring(0, boundaryLocation)).getBytes()).length;
saveFile = "D:/CETAF/Configuration/" + saveFile;
File ff = new File(saveFile);
FileOutputStream fileOut = new FileOutputStream(ff);
fileOut.write(dataBytes, startPos, (endPos - startPos));
fileOut.flush();
fileOut.close();%><Br><table border="2">
<tr>
<td><b>You have successfully upload the file by the name of:</b>
<%
out.println(saveFile);
}
%>
</td>
</tr>
</table>
以上两个是我的jsp文件...如果我点击运行按钮，它应该调用那个java文件并执行dat action..how来调用那个java文件??