jsp文件输入输出流，FileReader,BufferedReader, FileWriter, BufferedWriter,FileInputStream,BufferedInputStream,FileOutputStream,BufferedOutputStream

底层流：FileReader, FileWriter, FileInputStream,FileOutputStream

高层流：BufferedReader,BufferedWriter,BufferedInputStream,BufferedOutputStream

高层流必须由底层流构建。

文件关闭顺序必须为先关高层流，再关底层流，否则将会导致高层流异常关闭。

贴一些代码：

功能为从本地test1.txt中读取内容显示在页面上，并写入本地test2.txt中。

<%@ page contentType="text/html;charset=gb2312" language="java" %>
<%@ page import = "java.io.*" %>
<HTML>
<BODY bgcolor=yellow>
<%
    int n = 0;
    File f1 = new File("C:/tomcat/ch3","test1.txt");
    File f2 = new File("C:/tomcat/ch3","test2.txt");
    FileInputStream in = new FileInputStream(f1);
    BufferedInputStream bufferin = new BufferedInputStream(in);
    byte b[] = new byte[1000];
    String temp = "";
    while((n=bufferin.read(b))!=-1){
        temp = new String(b, 0, n);
        out.println(temp);
    }
    FileOutputStream o = new FileOutputStream(f2);
    BufferedOutputStream bufferout = new BufferedOutputStream(o);
    bufferout.write(b);
    bufferout.flush();
    bufferout.close();
    in.close();
    bufferin.close();
　　o.close();

%>
</BODY>
</HTML>
<%@ page contentType="text/html;charset=gb2312" language="java" %>
<%@ page import = "java.io.*" %>
<HTML>
<BODY bgcolor=yellow>
<%
try{
    int n = 0;
    File f1 = new File("C:/tomcat/ch3","test1.txt");
    File f2 = new File("C:/tomcat/ch3","test2.txt");
    char b[] = new char[10000];
    FileReader fr = new FileReader(f1);
    BufferedReader br = new BufferedReader(fr);
    br.read(b);
    out.println(b);
    FileWriter o = new FileWriter(f2);
    BufferedWriter bw = new BufferedWriter(o);
    o.write(b);
    
    
    fr.close();
    br.close();
    bw.close();
    o.close();

}
catch(IOException e){
    out.println(e);
}

    
%>
</BODY>
</HTML>

 

posted @ 2017-11-09 13:46  深圳地铁Princess  阅读(299)  评论(0)  编辑  收藏  举报