properties类读取.properties 、简单XML文件、txt文件

Java中读写资源文件最重要的类是Properties,功能大致如下：

1. 读写Properties文件

2. 读写XML文件

3. 不仅可以读写上述两类文件，还可以读写其它格式文件如txt等，只要符合key=value格式即可.

注意：资源文件中含有中文时的处理方法

1. 将中文字符通过工作转成utf8编码，可以通过Java自带的nativetoascii或Eclipse中的属性编辑器。

2. 直接调用 new String(youChineseString.getBytes("ISO-8859-1"),"GBK");

附：WEB程序中加载资源文件的方法

Properties prop = null;

1. prop = Thread.currentThread().getContextClassLoader().getResourceAsStream("filename");

2. prop =this.getClass().getClassLoader().getResourceAsStream("filename");

Properties能读取以key,value存储的任何格式文件，究竟有什么神奇，猫一眼类结构，

原来它继承了Hashtable并实现了Map接口,这样大家放心了吧。

[java]view plaincopyprint? 
   
 packageapistudy;
importjava.io.File;
importjava.io.FileInputStream;
importjava.io.FileOutputStream;
importjava.io.IOException;
importjava.io.InputStream;
importjava.io.OutputStream;
importjava.io.UnsupportedEncodingException;
importjava.util.Properties;
publicclassPropertiesTest
{
staticvoidmain(String[]args)
{
Stringreadfile="d:"+File.separator+"readfile.properties";
Stringwritefile="writefile.properties";
Stringreadxmlfile="readxmlfile.xml";
Stringwritexmlfile="writexmlfile.xml";
Stringreadtxtfile="readtxtfile.txt";
Stringwritetxtfile="writetxtfile.txt";
readPropertiesFile(readfile);//读取properties文件
writePropertiesFile(writefile);//写properties文件
readPropertiesFileFromXML(readxmlfile);//读取XML文件
writePropertiesFileToXML(writexmlfile);//写XML文件
readPropertiesFile(readtxtfile);//读取txt文件
writePropertiesFile(writetxtfile);//写txt文件
}
//读取资源文件,并处理中文乱码
voidreadPropertiesFile(Stringfilename)
Propertiesproperties=newProperties();
try
InputStreaminputStream=newFileInputStream(filename);
properties.load(inputStream);
inputStream.close();//关闭流
}
catch(IOExceptione)
e.printStackTrace();
Stringusername=properties.getProperty("username");
Stringpasssword=properties.getProperty("password");
Stringchinese=properties.getProperty("chinese");
try
chinese=newString(chinese.getBytes("ISO-8859-1"),"GBK");//处理中文乱码
catch(UnsupportedEncodingExceptione)
e.printStackTrace();
System.out.println(username);
System.out.println(passsword);
System.out.println(chinese);
//读取XML文件,255); font-weight:bold; background-color:inherit">voidreadPropertiesFileFromXML(Stringfilename)
properties.loadFromXML(inputStream);
inputStream.close();
"chinese");//XML中的中文不用处理乱码，正常显示
//写资源文件，含中文
voidwritePropertiesFile(Stringfilename)
OutputStreamoutputStream=newFileOutputStream(filename);
properties.setProperty("username",0); background-color:inherit">"myname");
"password",0); background-color:inherit">"mypassword");
"chinese",0); background-color:inherit">"中文");
properties.store(outputStream,"author:shixing_11@sina.com");
outputStream.close();
catch(IOExceptione)
//写资源文件到XML文件，含中文
voidwritePropertiesFileToXML(Stringfilename)
newProperties();
newFileOutputStream(filename);
"myname");
"mypassword");
"中文");
properties.storeToXML(outputStream,0); background-color:inherit">"author:shixing_11@sina.com");
outputStream.close();
}

运行本程序所需的资源文件，我是放在D盘根目录，如D:/readfile.properties

1. readfile.properties

username=myname

password=mypassword

chinese=中文

2.writefile.properties

#author: shixing_11@sina.com

#Fri May 28 22:19:44 CST 2010

chinese=/u4E2D/u6587

username=myname

3.readxmlfile.xml
<?xml version="1.0" encoding="UTF-8" standalone="no"?>

<!DOCTYPE properties SYSTEM "http://java.sun.com/dtd/properties.dtd">

<properties>

<entry key="password">mypassword</entry>

<entry key="chinese">中文</entry>

<entry key="username">myname</entry>

</properties>

4.writexmlfile.xml

<?xml version="1.0" encoding="UTF-8" standalone="no"?>

<comment>author: shixing_11@sina.com</comment>

</properties>

5. readtxtfile.txt

username=myname

password=mypassword

chinese=中文

6.writetxtfile.txt

#author: shixing_11@sina.com

#Fri May 28 22:25:16 CST 2010

password=mypassword

chinese=/u4E2D/u6587

username=myname

properties类读取.properties 、简单XML文件、txt文件

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