WriteOver.Jsp

<html>
<head>
<title>Write over a file</title>
</head>
<body bgcolor="#000000">

<jsp:useBean id="writer" class="WriteOver" 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 WriteOver" />
</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>


import java.io.*;

/**
* WriteOver.java
* Written by　Morgan Catlin Email: [email protected]
*　 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 WriteOver {

　 private String path;
　 private String something;

　 public WriteOver() {
　　　 path = null;
　　　 something = "Default message";
　 } // constructor WriteOver

　 /**
　　 * 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 {

　　　　 File f = new File(path);
　　　　 PrintWriter out = new PrintWriter(new FileWriter(f));

　　　　 out.print(this.getSomething() + "\n");
　　　　 out.close();
　　　　 return "Alles ist Gut.";
　　　 } catch (IOException e) {
　　　　 return e.toString();
　　　 }　　　　
　 } // method writeSomething
} // class WriteOver


jsp文件操作之追加篇

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: [email protected]
*　 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