jsp文件操作之追加篇(本站文章)
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如何用jsp将数据追加到一个文件中，下面是实现方法
writeAppend.jsp
<html>
<head>
<title>Append a file</title>
</head>
<body bgcolor="#000000">
<jsp:useBean id="writer" class="WriteAppend" scope="request">
<jsp:setProperty name="writer" property="path" value="/path/to/afile.txt" />
<jsp:setProperty name="writer" property="something" value="Something already set as a property in WriteAppend" />
</jsp:useBean>
<h3>Write to the file</h3>
<p>
<% writer.setSomething("Something to write to the file"); %>
<% out.print(writer.getSomething()); %>
<% out.print(writer.writeSomething()); %>
</p>
</body>
</html>
WriteAppend.java
import java.io.*;
/**
* WriteAppend.java
* Written by Morgan Catlin Email: mfcatlin@csclub2.stthomas.edu
* August 19, 1999
*
* Variables:
* String path = path to file to write to (ie. /you/afile.txt)
* String something = something to write to the file
*
* Methods:
* void setPath() = sets path
* String getPath() = returns path
* void setSomething() = sets something
* String getSomething() = returns something
* String writeSomething() = writes something to the path,
* returns a message that indicates success or failure(an Exception)
*/
public class WriteAppend {
private String path;
private String something;
public WriteAppend() {
path = null;
something = "Default message";
} // constructor WriteAppend
/**
* Mutator for the path property
*/
public void setPath(String apath) {
path = apath;
} // mutator setPath
/**
* Accessor for the path property
*/
public String getPath() {
return path;
} // accessor getPathClient
/**
* Mutator for the something property
*/
public void setSomething(String asomething) {
something = asomething;
} // mutator setSomething
/**
* Accessor for the something property
*/
public String getSomething() {
return something;
} // accessor getSomething
/**
* This method writes something to the path
*/
public String writeSomething() {
try {
FileWriter theFile = new FileWriter(path,true);
PrintWriter out = new PrintWriter(theFile);
out.print(something + "\n");
out.close();
theFile.close();
return "Das war sehr gut!";
} catch (IOException e) {
return e.toString();
}
} // method writeSomething
} // class WriteAppend
