<%@ page contentType="text/html; charset=gb2312" language="java" import="java.sql.*" errorPage="" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>写一个文件</title>
</head>
<body>
<%--创建javabean并设置属性--%>
<jsp:useBean id="writer" class="ch9.WriteFile" scope="request">
<jsp:setProperty name="writer" property="path" value="e:\\jsp\\writefile.txt" />
<jsp:setProperty name="writer" property="something" value="初始化something属性" />
</jsp:useBean>
<h3>写一个文件</h3>
<p>
<%--设置要写入的字符串--%>
<% writer.setSomething("这是写到文件的内容"); %>
<%--读取上面设置的字符串--%>
<% out.print(writer.getSomething()); %>
<%--调用writer的writeSomething方法写入文件并返回成功或出错信息--%>
<% out.print(writer.writeSomething()); %>
</p>
</body>
</html>
jsp文件源码如上，用到的javabean源码如下：
package ch9;
import java.io.*;
public class WriteFile{
private String path;//文件路径
private String something;//写入的字符串
//初始化
public String WriteOver(){
path=null;
something="缺省文字";
return something;
}
//设置文件路径
public void setPath(String apath){
path=apath;
}
//得到文件路径
public String getPath(){
return path;
}
//得到字符串
public void setSomething(String asomething){
something=asomething;
}
//设置字符串
public String getSomething(){
return something;
}
//写入字符串到文件中,成功则返回success字符串
public String writeSomething(){
try{
File f=new File(path);
PrintWriter out=new PrintWriter(new FileWriter(f));
out.print(this.getSomething()+"\n");
out.close();
return "Success.";
}
catch(IOException e){
return e.toString();
}
}
}
编译之后，放到相应的目录下面，就可以调用了
以上例程已经运行通过。运行结果如下：
写一个文件
这是写到文件的内容 Success.
评论