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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>
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