BlogJava-我的java生涯-随笔分类-java文件操作

解决RandomAccessFile写入文件乱码的办法

我的java生涯 — Wed, 26 Mar 2008 06:19:00 GMT

try { RandomAccessFile out = new RandomAccessFile(file, " rw " );
out.seek(out.length()); // 将指针移动到文件末尾
out.writeBytes( " \r\n " );
mess = " 写入文件 " ;
byte buffer[] = new byte [ 1024 ];
buffer = mess.getBytes();
out.write(buffer);
out.close(); // 关闭文件流
} catch (IOException e) {
e.printStackTrace();
}

我的java生涯 2008-03-26 14:19 发表评论

读取指定的文件并转成字符串

我的java生涯 — Mon, 19 Nov 2007 07:26:00 GMT

InputStream filein = new FileInputStream( " C://1.txt " );
OutputStream output = response.getOutputStream(); // 得到输出流
BufferedOutputStream bos = new BufferedOutputStream(output); // 输出缓冲流
BufferedInputStream bis = new BufferedInputStream(filein); // 输入缓冲流
byte data[] = new byte [ 4096 ]; // 缓冲字节数
int size = 0 ;
size = bis.read(data);
while (size !=- 1 )     {
  bos.write(data, 0 ,size);
  size = bis.read(data);
  }
bis.close();
bos.flush(); // 清空输出缓冲流
bos.close();
    output.close();
filein.close();

我的java生涯 2007-11-19 15:26 发表评论

java读写删.text,.xml文件内容

我的java生涯 — Wed, 15 Aug 2007 07:10:00 GMT

1 package com.paiao.bdpm.flow.base;
2
3 import java.io.BufferedReader;
4 import java.io.BufferedWriter;
5 import java.io.File;
6 import java.io.FileReader;
7 import java.io.FileWriter;
8
9 public class ReadTextFile {
10      public BufferedReader bufread;
11      public BufferedWriter bufwriter;
12     File writefile;
13     String filepath, filecontent, read;
14     String readStr = "" ;
15      // 从文本文件中读取内容
16      public String readfile(String path)
17      {
18          try {
19             filepath = path; // 得到文本文件的路径
20             File file = new File(filepath);
21             FileReader fileread = new FileReader(file);
22             bufread = new BufferedReader(fileread);
23              while ((read = bufread.readLine()) != null ) {
24                 read = read + " \r\n " ;
25                 readStr = readStr + read;
26             }
27         } catch (Exception d) {
28             System.out.println(d.getMessage());
29         }
30          return readStr; // 返回从文本文件中读取内容
31     }
32
33      // 向文本文件中写入内容
34      public void writefile(String path, String content, boolean append) {
35          try {
36              boolean addStr = append; // 通过这个对象来判断是否向文本文件中追加内容
37             filepath = path; // 得到文本文件的路径
38             filecontent = content; // 需要写入的内容
39             writefile = new File(filepath);
40              if (writefile.exists() == false ) // 如果文本文件不存在则创建它
41              {
42                 writefile.createNewFile();
43                 writefile = new File(filepath); // 重新实例化
44             }
45             FileWriter filewriter = new FileWriter(writefile, addStr);
46              // 删除原有文件的内容
47             java.io.RandomAccessFile file = new java.io.RandomAccessFile(path, " rw " );
48             file.setLength( 0 );
49              // 写入新的文件内容
50             filewriter.write(filecontent);
51             filewriter.close();
52             filewriter.flush();
53         } catch (Exception d) {
54             System.out.println(d.getMessage());
55         }
56     }
57
58      public static void main(String[] args) throws Exception {
59         ReadTextFile parse = new ReadTextFile();
60         String filecontent = parse.readfile( " c:/applicationContext.xml " );
61         parse.writefile( " c:/applicationContext.xml " ,filecontent, true );
62
63     }
64 }

我的java生涯 2007-08-15 15:10 发表评论

拷贝一个文件到另一个地方

我的java生涯 — Sat, 24 Mar 2007 16:33:00 GMT

package codemaking.util;

import java.awt.*;
import java.io.*;
/**
* @author Administrator
*
* Class Function:
*/
public class copyDirectory {
public static void main(String args[]) throws IOException {
String url1="D:/download";
String url2="f:/download";
(new File(url2)).mkdirs();
File[] file=(new File(url1)).listFiles();
for(int i=0;iif(file[i].isFile()){
FileInputStream input=new FileInputStream(file[i]);
FileOutputStream output=new FileOutputStream(url2+"/"+file[i].getName());
byte[] b=new byte[1024*5];
int len;
while((len=input.read(b))!=-1){
output.write(b,0,len);
}
output.flush();
output.close();
input.close();
}
if(file[i].isDirectory()){
copyDirectiory(url2+"/"+file[i].getName(),url1+"/"+file[i].getName());
}
}
}

public static void copyDirectiory(String file1,String file2) throws IOException{
(new File(file1)).mkdirs();
File[] file=(new File(file2)).listFiles();
for(int i=0;i if(file[i].isFile()){
FileInputStream input=new FileInputStream(file[i]);
FileOutputStream output=new FileOutputStream(file1+"/"+file[i].getName());
byte[] b=new byte[1024*5];
   int len;
   while((len=input.read(b))!=-1){
    output.write(b,0,len);
    }
    output.flush();
       output.close();
    input.close();
   }
if(file[i].isDirectory()){
copyDirectiory(file1+"/"+file[i].getName(),file2+"/"+file[i].getName());
}

}

}
}

我的java生涯 2007-03-25 00:33 发表评论