jsp 实现文件保存与读取

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<%@ page language="java" import="java.util.*" pageEncoding="GBK"%><%@ page contentType="text/html; charset=GBK" %><%@page import="java.io.File"%><%@page import="java.io.PrintStream"%><%@page import="java.io.FileOutputStream"%><%@page import="java.io.FileInputStream"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>    <title>文件保存与读取</title>  </head>    <body>  <%      request.setCharacterEncoding("GBK");      String name = request.getParameter("filename");      String content = request.getParameter("filecontent");            String filename = this.getServletContext().getRealPath("/") + "file" + File.separator + name;            File file = new File(filename);            if(!file.getParentFile().exists()){          file.getParentFile().mkdir();//如果父文件夹不存在则创建文件夹      }            /************************存文件  start ************************/      PrintStream ps = null;      ps = new PrintStream(new FileOutputStream(file));      ps.println(content);      ps.close();      /************************存文件  end   ************************/  %>    <%      /************************读文件  start ************************/      Scanner scan = new Scanner(new FileInputStream(file));      scan.useDelimiter("\n");      StringBuffer buffer = new StringBuffer();      while(scan.hasNext()){          buffer.append(scan.next()).append("<br/>");      }      scan.close();      /************************读文件  end   ************************/  %>    <%=buffer %>  </body></html>
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