jsp文件操作之追加篇


答案：jsp文件操作之追加篇(本站文章)
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来源 jsp中国论坛 http://jspbbs.yeah.net

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
转载请注明来源
来源 jsp中国论坛 http://jspbbs.yeah.net
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