Java对各种文件的操作详解

ChinaItLab

lingwen2…

2006-11-16

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直接下载网上的文件
<%@ page contentType="text/html;charset=gb2312"%>
<%@ page import="java.io.*"%>
<%@ page import="java.net.*"%>
<%
  int bytesum=0;
  int byteread=0;
  URL url = new URL("http://java.chinaitlab.com/UploadFiles_8734/200611/20061116101405957.gif");
  byte[]  buffer =new  byte[1444];
    while ((byteread=inStream.read(buffer))!=-1)
    {
       out.println("<DT><B>"+byteread+"</B></DT>");
       bytesum+=byteread;
       //System.out.println(bytesum);
       fs.write(buffer,0,byteread);
     }
%>

按行读文件
<%@ page contentType="text/html; charset=gb2312" %>
<%@ page import="java.io.*" %>
<%
FileReader myFileReader=new FileReader("c:/哈哈.txt");
BufferedReader myBufferedReader=new BufferedReader(myFileReader);
String myString=null;
String resultString=new String();
while((myString=myBufferedReader.readLine())!=null) {
resultString=resultString+myString+"<br>";
}
out.println(resultString);
myFileReader.close();
%>

对word文档的处理（上传与下载）
<%@ page contentType="application/msword" %>

<%
   response.setHeader("Content-disposition","inline; filename=test1.doc"); //线上浏览方式
  // response.setHeader("Content-disposition","attachment; filename=test1.doc");//下载方式
   //以上这行设定传送到前端浏览器时的档名为test1.doc
   //就是靠这一行，让前端浏览器以为接收到一个word档
%>
//然后输出动态内容就可以得到一个word文档了

1,打开：
1）文件头上加：<%@ page  contentType="application/msword"%>
xml文件里：
<mime-mapping>
        <extension>doc</extension>
        <mime-type>application/msword</mime-type>
</mime-mapping>
2）可以用js,以下代码来自引用：
<%@ page contentType="text/html;charset=gb2312" import= "java.io.*"%>
<HTML>
<script>
var wrd=new ActiveXObject("Word.Application")
wrd.visible=true
alert ("您的"+wrd.Application.Caption+"安装路径为：\n"+wrd.Application.Path+"\n版本号是："+ wrd.Application.version+"\n注册使用者是："+wrd.Application.UserName)
wrd.Documents.Add()
//wrd.Documents.Open("c:\\exam.doc")
wrd.Selection.TypeText("This is some text.")
wrd.Application.Activate()
wrd.ActiveDocument.SaveAs("c:\\exam111.doc")
wrd=null
</script>
</HTML>

2，下载：
<%@ page contentType="text/html;charset=gb2312" import= "java.io.*"%>
<%// 得到文件名字和路径
  String filename = "jsp.doc";
  String filepath = "C:\\";

  // 设置响应头和下载保存的文件名
  response.setContentType("APPLICATION/OCTET-STREAM");
  response.setHeader("Content-Disposition","attachment; filename=\"" + filename + "\"");

  // 打开指定文件的流信息
  java.io.FileInputStream fileInputStream = new java.io.FileInputStream(filepath + filename);
  //FileOutputStream out  = new FileOutputStream(filepath+"测试\\" + filename);
  // 写出流信息
  int i;
  while ((i=fileInputStream.read()) != -1) {
   out.write(i);
  }
  fileInputStream.close();
  out.close();
%>