Java读取Properties文件的六种方法

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文章来源:http://www.open-open.com/lib/view/open1400721838050.html

使用J2SE API读取Properties文件的六种方法

1。使用java.util.Properties类的load()方法
示例： InputStream in = lnew BufferedInputStream(new FileInputStream(name));
Properties p = new Properties();
p.load(in);

2。使用java.util.ResourceBundle类的getBundle()方法
示例： ResourceBundle rb = ResourceBundle.getBundle(name, Locale.getDefault());

3。使用java.util.PropertyResourceBundle类的构造函数
示例： InputStream in = new BufferedInputStream(new FileInputStream(name));
ResourceBundle rb = new PropertyResourceBundle(in);

4。使用class变量的getResourceAsStream()方法
示例： InputStream in = JProperties.class.getResourceAsStream(name);
Properties p = new Properties();
p.load(in);

5。使用class.getClassLoader()所得到的java.lang.ClassLoader的getResourceAsStream()方法
示例： InputStream in = JProperties.class.getClassLoader().getResourceAsStream(name);
Properties p = new Properties();
p.load(in);

6。使用java.lang.ClassLoader类的getSystemResourceAsStream()静态方法
示例： InputStream in = ClassLoader.getSystemResourceAsStream(name);
Properties p = new Properties();
p.load(in);

补充

Servlet中可以使用javax.servlet.ServletContext的getResourceAsStream()方法
示例：InputStream in = context.getResourceAsStream(path);
Properties p = new Properties();
p.load(in);

完整的示例，可以参考附件文件

JProperties.java文件

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//import javax.servlet.ServletContext;
importjava.util.*;
importjava.io.InputStream;
importjava.io.IOException;
importjava.io.BufferedInputStream;
importjava.io.FileInputStream;
 
 
publicclass JProperties {
 
publicfinal static int BY_PROPERTIES = 1;
publicfinal static int BY_RESOURCEBUNDLE = 2;
publicfinal static int BY_PROPERTYRESOURCEBUNDLE = 3;
publicfinal static int BY_CLASS = 4;
publicfinal static int BY_CLASSLOADER = 5;
publicfinal static int BY_SYSTEM_CLASSLOADER = 6;
 
publicfinal static Properties loadProperties(finalString name, finalint type) throwsIOException {
Properties p = newProperties();
InputStream in = null;
if(type == BY_PROPERTIES) {
in = newBufferedInputStream(newFileInputStream(name));
assert(in != null);
p.load(in);
} elseif (type == BY_RESOURCEBUNDLE) {
ResourceBundle rb = ResourceBundle.getBundle(name, Locale.getDefault());
assert(rb != null);
p = newResourceBundleAdapter(rb);
} elseif (type == BY_PROPERTYRESOURCEBUNDLE) {
in = newBufferedInputStream(newFileInputStream(name));
assert(in != null);
ResourceBundle rb = newPropertyResourceBundle(in);
p = newResourceBundleAdapter(rb);
} elseif (type == BY_CLASS) {
assert(JProperties.class.equals(newJProperties().getClass()));
in = JProperties.class.getResourceAsStream(name);
assert(in != null);
p.load(in);
// return new JProperties().getClass().getResourceAsStream(name);
} elseif (type == BY_CLASSLOADER) {
assert(JProperties.class.getClassLoader().equals(newJProperties().getClass().getClassLoader()));
in = JProperties.class.getClassLoader().getResourceAsStream(name);
assert(in != null);
p.load(in);
// return new JProperties().getClass().getClassLoader().getResourceAsStream(name);
} elseif (type == BY_SYSTEM_CLASSLOADER) {
in = ClassLoader.getSystemResourceAsStream(name);
assert(in != null);
p.load(in);
}
 
if(in != null) {
in.close();
}
returnp;
 
}
 
// ---------------------------------------------- servlet used
 
 
// ---------------------------------------------- support class
 
 
publicstatic class ResourceBundleAdapter extendsProperties {
publicResourceBundleAdapter(ResourceBundle rb) {
assert(rb instanceofjava.util.PropertyResourceBundle);
this.rb = rb;
java.util.Enumeration e = rb.getKeys();
while(e.hasMoreElements()) {
Object o = e.nextElement();
this.put(o, rb.getObject((String) o));
}
}
 
privateResourceBundle rb = null;
 
publicResourceBundle getBundle(String baseName) {
returnResourceBundle.getBundle(baseName);
}
 
publicResourceBundle getBundle(String baseName, Locale locale) {
returnResourceBundle.getBundle(baseName, locale);
}
 
publicResourceBundle getBundle(String baseName, Locale locale, ClassLoader loader) {
returnResourceBundle.getBundle(baseName, locale, loader);
}
 
publicEnumeration getKeys() {
returnrb.getKeys();
}
 
publicLocale getLocale() {
returnrb.getLocale();
}
 
publicObject getObject(String key) {
returnrb.getObject(key);
}
 
publicString getString(String key) {
returnrb.getString(key);
}
 
publicString[] getStringArray(String key) {
returnrb.getStringArray(key);
}
 
protectedObject handleGetObject(String key) {
return((PropertyResourceBundle) rb).handleGetObject(key);
}
 
}
 
}
 
JPropertiesTest.java文件
 
 
packagecom.kindani.test;
 
importjunit.framework.*;
importcom.kindani.JProperties;
 
//import javax.servlet.ServletContext;
importjava.util.Properties;
 
publicclass JPropertiesTest extendsTestCase {
JProperties jProperties;
String key = "helloworld.title";
String value = "Hello World!";
 
publicvoid testLoadProperties() throwsException {
String name = null;
Properties p = newProperties();
 
name = "C:\\IDEAP\\Properties4Methods\\src\\com\\kindani\\test\\LocalStrings.properties";
p = JProperties.loadProperties(name, JProperties.BY_PROPERTIES);
assertEquals(value, p.getProperty(key));
 
name = "com.kindani.test.LocalStrings";
p = JProperties.loadProperties(name,JProperties.BY_RESOURCEBUNDLE);
assertEquals(value, p.getProperty(key));
assertEquals(value,((JProperties.ResourceBundleAdapter)p).getString(key));
 
name = "C:\\IDEAP\\Properties4Methods\\src\\com\\kindani\\test\\LocalStrings.properties";
p = JProperties.loadProperties(name, JProperties.BY_PROPERTYRESOURCEBUNDLE);
assertEquals(value, p.getProperty(key));
assertEquals(value,((JProperties.ResourceBundleAdapter)p).getString(key));
 
name = "\\com\\kindani\\test\\LocalStrings.properties";
p = JProperties.loadProperties(name, JProperties.BY_SYSTEM_CLASSLOADER);
assertEquals(value, p.getProperty(key));
 
name = "\\com\\kindani\\test\\LocalStrings.properties";
p = JProperties.loadProperties(name, JProperties.BY_CLASSLOADER);
assertEquals(value, p.getProperty(key));
 
name = "test\\LocalStrings.properties";
p = JProperties.loadProperties(name, JProperties.BY_CLASS);
assertEquals(value, p.getProperty(key));
}
 
 
}
 
properties文件与JPropertiesTest.java文件相同的目录下
LocalStrings.properties文件
# $Id: LocalStrings.properties,v 1.12000/08/1700:57:52horwat Exp $
 
# Default localized resources forexample servlets
# This locale is en_US
 
helloworld.title=Hello World!
 
requestinfo.title=Request Information Example
requestinfo.label.method=Method:
requestinfo.label.requesturi=Request URI:
requestinfo.label.protocol=Protocol:
requestinfo.label.pathinfo=Path Info:
requestinfo.label.remoteaddr=Remote Address:
 
requestheader.title=Request Header Example
 
requestparams.title=Request Parameters Example
requestparams.params-in-req=Parameters in thisrequest:
requestparams.no-params=No Parameters, Please enter some
requestparams.firstname=First Name:
requestparams.lastname=Last Name:
 
cookies.title=Cookies Example
cookies.cookies=Your browser is sending the following cookies:
cookies.no-cookies=Your browser isn't sending any cookies
cookies.make-cookie=Create a cookie to send to your browser
cookies.name=Name:
cookies.value=Value:
cookies.set=You just sent the following cookie to your browser:
 
sessions.title=Sessions Example
sessions.id=Session ID:
sessions.created=Created:
sessions.lastaccessed=Last Accessed:
sessions.data=The following data is in your session:
sessions.adddata=Add data to your session
sessions.dataname=Name of Session Attribute:
sessions.datavalue=Value of Session Attribute:
 
-----------------------------------------------------------------------------------------------------------------------------------------------
 
Java对properties配置文件的操作
 
 
packagecom.yorsun;
 
importjava.io.File;
importjava.io.FileInputStream;
importjava.io.FileNotFoundException;
importjava.io.FileOutputStream;
importjava.io.IOException;
importjava.util.Properties;
 
importjavax.servlet.ServletContext;
importjavax.servlet.http.HttpServlet;
 
 
publicclass PropertiesUnit {
privateString filename;
 
privateProperties p;
 
privateFileInputStream in;
 
privateFileOutputStream out;
 
publicPropertiesUnit(String filename) {
this.filename = filename;
File file = newFile(filename);
try{
in = newFileInputStream(file);
p = newProperties();
p.load(in);
in.close();
} catch(FileNotFoundException e) {
// TODO Auto-generated catch block
System.err.println("配置文件config.properties找不到！");
e.printStackTrace();
} catch(IOException e) {
// TODO Auto-generated catch block
System.err.println("读取配置文件config.properties错误！");
e.printStackTrace();
}
}
 
publicstatic String getConfigFile(HttpServlet hs) {
returngetConfigFile(hs, "config.properties");
}
 
 
privatestatic String getConfigFile(HttpServlet hs, String configFileName) {
String configFile = "";
ServletContext sc = hs.getServletContext();
configFile = sc.getRealPath("/"+ configFileName);
if(configFile == null|| configFile.equals("")) {
configFile = "/"+ configFileName;
}
// TODO Auto-generated method stub
returnconfigFile;
}
 
publicvoid list() {
p.list(System.out);
}
 
publicString getValue(String itemName) {
returnp.getProperty(itemName);
}
 
publicString getValue(String itemName, String defaultValue) {
returnp.getProperty(itemName, defaultValue);
}
 
publicvoid setValue(String itemName, String value) {
p.setProperty(itemName, value);
}
 
publicvoid saveFile(String filename, String description) throwsException {
try{
File f = newFile(filename);
out = newFileOutputStream(f);
p.store(out, description);
out.close();
} catch(IOException ex) {
thrownew Exception("无法保存指定的配置文件:"+ filename);
}
}
 
publicvoid saveFile(String filename) throwsException{
saveFile(filename,"");
}
 
publicvoid saveFile() throwsException{
if(filename.length()==0)
thrownew Exception("需指定保存的配置文件名");
saveFile(filename);
}
 
publicvoid deleteValue(String value){
p.remove(value);
}
 
publicstatic void main(String args[]){
String file="/eclipse/workspace/NewsTest/WEB-INF/config.properties";
// String file="D:\\eclipse\\workspace\\NewsTest\\WEB-INF\\config.properties";
PropertiesUnit pu=newPropertiesUnit(file);
pu.list();
}
 
}
 
---------------------------------------------------------------------------------------------------------------------------------
 
importjava.io.BufferedInputStream;
importjava.io.File;
importjava.io.FileInputStream;
importjava.io.FileNotFoundException;
importjava.io.IOException;
importjava.io.InputStream;
importjava.util.Properties;
 
publicclass ReadPropertiesFile ...{
 
publicvoid readPropertiesFile(String fileName) throwsFileNotFoundException ...{
String str = "";
Properties prop = newProperties();
 
InputStream stream = null;
 
//读取这个类在同一包中的properties文件
//stream = getClass().getClassLoader().getResourceAsStream(fileName);
System.out.println("path:"+ getClass().getResource(fileName));
 
 
//读取SRC下的的properties文件
String path = getClass().getResource("/").getPath();
stream = newBufferedInputStream(newFileInputStream(newFile(path+fileName)));
 
try...{
prop.load(stream);
str = prop.getProperty("localname");
System.out.println("localname:"+ str);
System.out.println("properties:"+ prop);
stream.close();
 
} catch(IOException e) ...{
// TODO Auto-generated catch block
e.printStackTrace();
}
}
 
 
publicstatic void main(String[] args) throwsFileNotFoundException ...{
// TODO Auto-generated method stub
newReadPropertiesFile().readPropertiesFile("config.properties");
 
}
 
}
 
--------------------------------------------------------------------------------------------------------------------------------------
 
//=================sprin配置文件================================
<bean
id="userService"
class="com.thtf.ezone.ezesb.jmx.admin.service.impl.UserServiceImpl">
<property
name="filePath"
value="config/userInfo.properties"/>
</bean>
 
//=================java文件================================
 
packagecom.thtf.ezone.ezesb.jmx.admin.service.impl;
 
importjava.io.FileInputStream;
importjava.io.IOException;
importjava.util.Properties;
 
publicclass UserServiceImpl implementsUserService {
 
String filePath = null;
 
publicvoid setFilePath(String filePath) {
this.filePath = filePath;
}
 
publicstatic void main(String dd[])throwsException{
 
Properties p = newProperties();
FileInputStream ferr=newFileInputStream((getClass().getClassLoader()
.getResource("") + filePath).toString().substring(6));// 用subString(6)去掉：file:/try{
p.load(ferr);
ferr.close();
Set s = p.keySet();
Iterator it = s.iterator();
while(it.hasNext()){
String id = (String)it.next();
String value = p.getProperty(id);
System.out.println(id+":="+value);
}
}catch(Exception e){
e.printStackTrace();
}
}
}

//==============databaseconfing.properties 文件=====================

#----------------------------------
# sql server 2000数据厍连接信息
#----------------------------------
dp.sd.DataBaseTyp=mssql
DataBaseHost=127.0.0.1:1433
DataBase=formpro
UserName=sa
PassWord=01
#----------------------------------
# mysql 数据厍连接信息
#----------------------------------
#DataBaseHost=127.0.0.1:3306
#DataBaseTyp=mysql
#DataBase=snow
#UserName=root
#PassWord=01
//==========================运行结果=======================

PassWord:=01
DataBaseHost:=127.0.0.1:1433
DataBase:=formpro
dp.sd.DataBaseTyp:=mssql
UserName:=sa

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