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java代碼獲取本地文件,java從服務(wù)器上獲取文件到本地

用java代碼如何查看本地一個(gè)文件的大小

public?static?void?getFileSize(String?path){

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//傳入文件路徑

File?file?=?new?File(path);

//測試此文件是否存在

if(file.exists()){

//如果是文件夾

//這里只檢測了文件夾中第一層?如果有需要?可以繼續(xù)遞歸檢測

if(file.isDirectory()){

int?size?=?0;

for(File?zf?:?file.listFiles()){

if(zf.isDirectory())?continue;

size?+=?zf.length();

}

System.out.println("文件夾?"+file.getName()+"?Size:?"+(size/1024f)+"kb");

}else{

System.out.println(file.getName()+"?Size:?"+(file.length()/1024f)+"kb");

}

//如果文件不存在

}else{

System.out.println("此文件不存在");

}

}

使用java實(shí)現(xiàn)創(chuàng)建本地文件的代碼

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.OutputStream;

import java.io.OutputStreamWriter;

import java.io.PrintWriter;

public class CreateFile {

public static void main(String[] args) {

String str = "需要寫入的字";

String fileName = "D:\\a\\a.xml";

OutputStream output = null;// 輸出字節(jié)流

OutputStreamWriter outputWrite = null;// 輸出字符流

PrintWriter print = null;// 輸出緩沖區(qū)

try {

output = new FileOutputStream(fileName);

outputWrite = new OutputStreamWriter(output);

print = new PrintWriter(outputWrite);

print.print(str);

print.flush();// 一定不要忘記此句，否則數(shù)據(jù)有可能不能被寫入文件

output.close();

} catch (FileNotFoundException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

}

}

再一個(gè)問題就是只要你編碼正確就可以正常打開。

JAVA讀取本地TXT文件轉(zhuǎn)換為XML文件輸出

txt文件格式如下，采用的是一個(gè)服務(wù)端tomcat的log日志

[06/Mar/2013:18:43:55]?110.110.1.1?GET?/rest/keyword/getallids/aid/3/os/android2.3.5/ver/1.0/?HTTP/1.1?200?210?1453?1.453?'Dalvik/1.4.0?(Linux;?U;?Android?2.3.5;?T550?Build/MocorDroid2.3.5)'

[06/Mar/2013:18:43:55]?110.110.1.1?GET?/rest/keyword/getallids/aid/3/os/android2.3.4/ver/1.0/?HTTP/1.1?200?210?1453?1.453?'Dalvik/1.4.0?(Linux;?U;?Android?2.3.4;?LG-E730?Build/GRJ22)'

[06/Mar/2013:18:43:55]?110.110.1.1?GET?/rest/keyword/getallids/aid/3/os/android2.3.5/ver/1.0/?HTTP/1.1?200?210?1453?1.453?'Dalvik/1.4.0?(Linux;?U;?Android?2.3.5;?MI-ONE?Plus?Build/GINGERBREAD)'

[06/Mar/2013:18:43:55]?110.110.1.1?GET?/rest/keyword/getallids/aid/3/os/android2.3.6/ver/1.0/?HTTP/1.1?200?210?1453?1.453?'Dalvik/1.4.0?(Linux;?U;?Android?2.3.6;?GT-I9220?Build/GINGERBREAD)'

[06/Mar/2013:18:43:55]?110.110.1.1?POST?/rest/keyword/getallids/aid/3/os/android4.0.3/ver/1.0/?HTTP/1.1?200?210?1469?1.469?'Dalvik/1.6.0?(Linux;?U;?Android?4.0.3;?HUAWEI?C8812?Build/HuaweiC8812)'

[06/Mar/2013:18:43:55]?110.110.1.1?GET?/rest/keyword/getallids/aid/3/os/android2.2.2/ver/1.0/?HTTP/1.1?200?210?1453?1.453?'Dalvik/1.2.0?(Linux;?U;?Android?2.2.2;?HUAWEI?T8300?Build/FRF91)'

[06/Mar/2013:18:43:55]?110.110.1.1?GET?/rest/keyword/getallids/aid/3/os/android2.3.6/ver/1.0/?HTTP/1.0?200?210?1484?1.484?'Dalvik/1.4.0?(Linux;?U;?Android?2.3.6;?Mytel?Build/GRK39F)'

[06/Mar/2013:18:43:55]?110.110.1.1?POST?/rest/keyword/getallids/aid/3/os/android4.1.1/ver/1.0/?HTTP/1.1?200?210?1406?1.406?'Dalvik/1.6.0?(Linux;?U;?Android?4.1.1;?GT-N7100?Build/JRO03C)'

轉(zhuǎn)換代碼如下

package?test;

import?java.io.BufferedReader;

import?java.io.File;

import?java.io.FileReader;

import?java.io.FileWriter;

import?java.io.IOException;

import?java.io.Writer;

import?org.dom4j.Document;

import?org.dom4j.DocumentHelper;

import?org.dom4j.Element;

import?org.dom4j.io.XMLWriter;

public?class?promble04?{

@SuppressWarnings("resource")

public?static?void?txtToXML(String?txtPath)?throws?IOException

{

File?file?=?new?File(txtPath);

Document?document?=?DocumentHelper.createDocument();

Element?list?=?document.addElement("list");

BufferedReader?br?=?new?BufferedReader(new?FileReader(file));

String?line?=?br.readLine();

while(line!=null)

{

String?temp[]??=?line.split("?");

Element?log?=?list.addElement("log");

Element?time?=?log.addElement("time");

Element?ip?=?log.addElement("ip");

Element?httpType?=?log.addElement("httpType");

Element?url?=?log.addElement("url");

Element?httplevel?=?log.addElement("httplevel");

Element?linuxVersion?=?log.addElement("linuxVersion");

Element?os?=?log.addElement("os");

Element?AndroidVersion?=?log.addElement("AndroidVersion");

Element?phoneType?=?log.addElement("phoneType");

for(int?i?=?0;itemp.length;i++)

{

time.setText(temp[0]);

ip.setText(temp[1]);

httpType.setText(temp[2]);

url.setText(temp[3]);

httplevel.setText(temp[4]);

linuxVersion.setText(temp[9]);

os.setText(temp[10]);

AndroidVersion.setText(temp[12]);

phoneType.setText(temp[13]);

}

line?=?br.readLine();

}

Writer?filewriter?=?new?FileWriter("D:\\log\\test.xml");

XMLWriter?xmlWriter?=?new?XMLWriter(filewriter);

xmlWriter.write(document);

xmlWriter.close();

}

public?static?void?main(String?args[])?throws?IOException

{

promble04.txtToXML("D:\\log\\test.txt");

}

}

轉(zhuǎn)換結(jié)果如下

?xml?version="1.0"?encoding="UTF-8"?

list

log

time[06/Mar/2013:18:43:55]/time

ip110.110.1.1/ip

httpTypeGET/httpType

url/rest/keyword/getallids/aid/3/os/android2.3.5/ver/1.0//url

httplevelHTTP/1.1/httplevel

linuxVersion'Dalvik/1.4.0/linuxVersion

os(Linux;/os

AndroidVersionAndroid/AndroidVersion

phoneType2.3.5;/phoneType

/log

log

time[06/Mar/2013:18:43:55]/time

ip110.110.1.1/ip

httpTypeGET/httpType

url/rest/keyword/getallids/aid/3/os/android2.3.4/ver/1.0//url

httplevelHTTP/1.1/httplevel

linuxVersion'Dalvik/1.4.0/linuxVersion

os(Linux;/os

AndroidVersionAndroid/AndroidVersion

phoneType2.3.4;/phoneType

/log

log

time[06/Mar/2013:18:43:55]/time

ip110.110.1.1/ip

httpTypeGET/httpType

url/rest/keyword/getallids/aid/3/os/android2.3.5/ver/1.0//url

httplevelHTTP/1.1/httplevel

linuxVersion'Dalvik/1.4.0/linuxVersion

os(Linux;/os

AndroidVersionAndroid/AndroidVersion

phoneType2.3.5;/phoneType

/log

log

time[06/Mar/2013:18:43:55]/time

ip110.110.1.1/ip

httpTypeGET/httpType

url/rest/keyword/getallids/aid/3/os/android2.3.6/ver/1.0//url

httplevelHTTP/1.1/httplevel

linuxVersion'Dalvik/1.4.0/linuxVersion

os(Linux;/os

AndroidVersionAndroid/AndroidVersion

phoneType2.3.6;/phoneType

/log

log

time[06/Mar/2013:18:43:55]/time

ip110.110.1.1/ip

httpTypePOST/httpType

url/rest/keyword/getallids/aid/3/os/android4.0.3/ver/1.0//url

httplevelHTTP/1.1/httplevel

linuxVersion'Dalvik/1.6.0/linuxVersion

os(Linux;/os

AndroidVersionAndroid/AndroidVersion

phoneType4.0.3;/phoneType

/log

log

time[06/Mar/2013:18:43:55]/time

ip110.110.1.1/ip

httpTypeGET/httpType

url/rest/keyword/getallids/aid/3/os/android2.2.2/ver/1.0//url

httplevelHTTP/1.1/httplevel

linuxVersion'Dalvik/1.2.0/linuxVersion

os(Linux;/os

AndroidVersionAndroid/AndroidVersion

phoneType2.2.2;/phoneType

/log

log

time[06/Mar/2013:18:43:55]/time

ip110.110.1.1/ip

httpTypeGET/httpType

url/rest/keyword/getallids/aid/3/os/android2.3.6/ver/1.0//url

httplevelHTTP/1.0/httplevel

linuxVersion'Dalvik/1.4.0/linuxVersion

os(Linux;/os

AndroidVersionAndroid/AndroidVersion

phoneType2.3.6;/phoneType

/log

log

time[06/Mar/2013:18:43:55]/time

ip110.110.1.1/ip

httpTypePOST/httpType

url/rest/keyword/getallids/aid/3/os/android4.1.1/ver/1.0//url

httplevelHTTP/1.1/httplevel

linuxVersion'Dalvik/1.6.0/linuxVersion

os(Linux;/os

AndroidVersionAndroid/AndroidVersion

phoneType4.1.1;/phoneType

/log

/list

在java中我讀取本地txt文件，txt文件中有兩行數(shù)據(jù)，要在這個(gè)文件中每一行后加數(shù)據(jù)，該怎么寫

import java.io.*;

public class FileExample{

public static void main(String args[])

{

try

{

char str[]=new char[20];

FileReader f1=new FileReader("a.txt");

FileWriter f2=new FileWriter("b.txt");

f1.read(str);

f2.write(str);

f2.close();

f1.close();

}

catch(Exception e)

{

}

}

}

java代碼讀取本地文件讀不到，不是路徑問題，不是文件隱藏名問題。

你確定有這個(gè)文件嗎？為什么我試了下都是可以的啊，是不是你的編碼有問題不支持中文的啊

你換個(gè)英文的文件名稱試試可以不可以?？词遣皇侵形木幋a的問題。如果是的 你是是修改下屬性

filename = new String(filename.getBytes("GBK"), "iso8859-1");//文件名要轉(zhuǎn)一下編碼。

再試試 希望能幫到你！


當(dāng)前名稱：java代碼獲取本地文件,java從服務(wù)器上獲取文件到本地
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