java代码获取本地文件,java从服务器上获取文件到本地

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用java代码如何查看本地一个文件的大小

public static void getFileSize(String path){

//传入文件路径

File file = new File(path);

//测试此文件是否存在

if(file.exists()){

//如果是文件夹

//这里只检测了文件夹中第一层如果有需要可以继续递归检测

if(file.isDirectory()){

int size = 0;

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

if(zf.isDirectory()) continue;

size += zf.length();

}

System.out.println("文件夹 "+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");

}

相关问答

Q1: 使用java实现创建本地文件的代码

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 = "需要写入的字";

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

OutputStream output = null;// 输出字节流

OutputStreamWriter outputWrite = null;// 输出字符流

PrintWriter print = null;// 输出缓冲区

try {

output = new FileOutputStream(fileName);

outputWrite = new OutputStreamWriter(output);

print = new PrintWriter(outputWrite);

print.print(str);

print.flush();// 一定不要忘记此句，否则数据有可能不能被写入文件

output.close();

} catch (FileNotFoundException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

再一个问题就是只要你编码正确就可以正常打开。

Q2: JAVA读取本地TXT文件转换为XML文件输出

txt文件格式如下，采用的是一个服务端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)'

转换代码如下

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");

}

转换结果如下

?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

Q3: 在java中我读取本地txt文件，txt文件中有两行数据，要在这个文件中每一行后加数据，该怎么写

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)

{

}

Q4: java代码读取本地文件读不到，不是路径问题，不是文件隐藏名问题。

你确定有这个文件吗？为什么我试了下都是可以的啊，是不是你的编码有问题不支持中文的啊

你换个英文的文件名称试试可以不可以。看是不是中文编码的问题。如果是的你是是修改下属性

filename = new String(filename.getBytes("GBK"), "iso8859-1");//文件名要转一下编码。

再试试希望能帮到你！

正文

用java代码如何查看本地一个文件的大小

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