文本文件读取和写入

package count;
import java.io.*;
public class OP_File
{
public BufferedReader bufread;
public BufferedWriter bufwriter;
File writefile;
String filepath,filecontent,read;
String readStr="";

public String readfile(String path) //从文本文件中读取内容
{
try
{
filepath=path; //得到文本文件的路径
File file=new File(filepath);
FileReader fileread=new FileReader(file);
bufread=new BufferedReader(fileread);
while((read=bufread.readLine())!=null)
{
readStr=readStr+read;
}
}catch(Exception d){System.out.println(d.getMessage());}
return readStr; //返回从文本文件中读取内容
}
//向文本文件中写入内容
public void writefile(String path,String content,boolean append)
{
try
{
boolean addStr=append; //通过这个对象来判断是否向文本文件中追加内容
filepath=path; //得到文本文件的路径
filecontent=content; //需要写入的内容
writefile=new File(filepath);
if(writefile.exists()==false) //如果文本文件不存在则创建它
{
writefile.createNewFile();
writefile=new File(filepath); //重新实例化
}
FileWriter filewriter=new FileWriter(writefile,addStr);
bufwriter=new BufferedWriter(filewriter);
filewriter.write(filecontent);
filewriter.flush();
}catch(Exception d){System.out.println(d.getMessage());}
}
}


////////////////jsp文件
<%@ page contentType="text/html;charset=GB2312" %>
<%@ page import="java.io.*" %>
<html>
<head></head>
<body>
<jsp:useBean id="filecontrol" class="count.OP_File" scope="page"/>
<%
filecontrol.writefile("aa.txt","liuxiantong",false);
//方法参数("路径","内容",true/false)--->是否追加
String string=filecontrol.readfile("aa.txt");
//方法:返回字符串 参数("路径")
out.println(string); //将读到的内容输出
%>
</body>
</html>

你可能感兴趣的:(html,jsp)