?? jsp文件操作之讀取篇.txt
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作者：asp3000
email: coolknight@263.net
日期：2000-8-8 12:00:20
jsp文件操作之讀取篇(本站文章)
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來(lái)源 jsp中國(guó)論壇 http://jspbbs.yeah.net
Read.jsp
<html>
<head>
<title>Read a file</title>
</head>
<body bgcolor="#000000">
<jsp:useBean id="reader" class="DelimitedDataFile" scope="request">
<jsp:setProperty name="reader" property="path" value="/path/to/afile.txt" />
</jsp:useBean>
<h3>Contents of the file:</h3>
<p>
<% int count = 0; %>
<% while (reader.nextRecord() != -1) { %>
<% count++; %>
<b>Line <% out.print(count); %>:</b> <% out.print(reader.returnRecord()); %><br>
<% } %>
</p>
</body>
</html>
import java.io.*;
import java.util.StringTokenizer;
public class DelimitedDataFile
{
/**
* DelimitedDataFile.java
* Written by Morgan Catlin Email: mfcatlin@csclub2.stthomas.edu
* April 6, 1999
*
* Variables:
* String currentRecord = the record the bean is currently working on
* BufferedReader file = the file the bean is working with
* String path = the path to the file (ie. /home/you/afile.txt)
* StringTokenizer token = the currentRecord tokenized
*
* Methods:
* public void setPath() - creates a BufferedReader that reads the file in path
* public String getPath() - returns path
* public void fileClose() - closes the file that is being read
* public int nextRecord() - reads the next record(line) in the file,
* and returns the number of tokens in the record
* or else returns -1 if there aren't anymore records
* public double returnDouble() - returns the next token as a double
* public int returnInt() - returns the next token as an int
* public String returnString() - returns the next token as a String
* public String returnRecord() - returns the entire record as a String
*/
private String currentRecord = null;
private BufferedReader file;
private String path;
private StringTokenizer token;
public DelimitedDataFile()
{
file = new BufferedReader(new InputStreamReader(System.in),1);
} // constructor 1
public DelimitedDataFile(String filePath) throws FileNotFoundException
{
// gets file
path = filePath;
file = new BufferedReader(new FileReader(path));
} // constructor DelimitedDataFile
public void setPath(String filePath)
{
// sets the file
path = filePath;
try {
file = new BufferedReader(new
FileReader(path));
} catch (FileNotFoundException e) {
System.out.println("file not found");
}
} // method setPath
public String getPath() {
return path;
} // method getPath
public void fileClose() throws IOException
{
// closes file
file.close();
} // method fileClose
public int nextRecord()
{
// this method reads the next record and returns the number of
// tokens or else returns -1
int returnInt = -1;
try
{
currentRecord = file.readLine();
} // end try
catch (IOException e)
{
System.out.println("readLine problem, terminating.");
} // end catch
if (currentRecord == null)
returnInt = -1;
else
{
token = new StringTokenizer(currentRecord);
returnInt = token.countTokens();
} // end else
return returnInt;
} // method nextRecord
public double returnDouble()
{
// this method returns the next token as a double
double doubleReturn = Double.valueOf(token.nextToken()).doubleValue();
return doubleReturn;
} // method returnDouble
public int returnInt()
{
// this method returns the next token as an int
int returnint = Integer.parseInt(token.nextToken());
return returnint;
} // method returnInt
public String returnString()
{
// this method returns the next token as a String
String stringReturn = token.nextToken();
return stringReturn;
} // method returnString
public String returnRecord()
{
// this method returna the entire record as a string
return currentRecord;
} // method returnRecord
} // class DelimitedDataFile
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