Java读取Properties文件的六种方法

墨蓝 2022-08-13 11:52 179阅读 0赞

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);  
  
JProperties.java文件  
  
package com.kindani;  
  
//import javax.servlet.ServletContext;  
import java.util.\*;  
import java.io.InputStream;  
import java.io.IOException;  
import java.io.BufferedInputStream;  
import java.io.FileInputStream;  
  
  
public class JProperties \{  
  
public final static int BY\_PROPERTIES = 1;  
public final static int BY\_RESOURCEBUNDLE = 2;  
public final static int BY\_PROPERTYRESOURCEBUNDLE = 3;  
public final static int BY\_CLASS = 4;  
public final static int BY\_CLASSLOADER = 5;  
public final static int BY\_SYSTEM\_CLASSLOADER = 6;  
  
public final static Properties loadProperties(final String name, final int type) throws IOException \{  
Properties p = new Properties();  
InputStream in = null;  
if (type == BY\_PROPERTIES) \{  
in = new BufferedInputStream(new FileInputStream(name));  
assert (in != null);  
p.load(in);  
\} else if (type == BY\_RESOURCEBUNDLE) \{  
ResourceBundle rb = ResourceBundle.getBundle(name, Locale.getDefault());  
assert (rb != null);  
p = new ResourceBundleAdapter(rb);  
\} else if (type == BY\_PROPERTYRESOURCEBUNDLE) \{  
in = new BufferedInputStream(new FileInputStream(name));  
assert (in != null);  
ResourceBundle rb = new PropertyResourceBundle(in);  
p = new ResourceBundleAdapter(rb);  
\} else if (type == BY\_CLASS) \{  
assert (JProperties.class.equals(new JProperties().getClass()));  
in = JProperties.class.getResourceAsStream(name);  
assert (in != null);  
p.load(in);  
// return new JProperties().getClass().getResourceAsStream(name);  
\} else if (type == BY\_CLASSLOADER) \{  
assert (JProperties.class.getClassLoader().equals(new JProperties().getClass().getClassLoader()));  
in = JProperties.class.getClassLoader().getResourceAsStream(name);  
assert (in != null);  
p.load(in);  
// return new JProperties().getClass().getClassLoader().getResourceAsStream(name);  
\} else if (type == BY\_SYSTEM\_CLASSLOADER) \{  
in = ClassLoader.getSystemResourceAsStream(name);  
assert (in != null);  
p.load(in);  
\}  
  
if (in != null) \{  
in.close();  
\}  
return p;  
  
\}  
  
// ---------------------------------------------- servlet used  
  
  
// ---------------------------------------------- support class  
  
  
public static class ResourceBundleAdapter extends Properties \{  
public ResourceBundleAdapter(ResourceBundle rb) \{  
assert (rb instanceof java.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));  
\}  
\}  
  
private ResourceBundle rb = null;  
  
public ResourceBundle getBundle(String baseName) \{  
return ResourceBundle.getBundle(baseName);  
\}  
  
public ResourceBundle getBundle(String baseName, Locale locale) \{  
return ResourceBundle.getBundle(baseName, locale);  
\}  
  
public ResourceBundle getBundle(String baseName, Locale locale, ClassLoader loader) \{  
return ResourceBundle.getBundle(baseName, locale, loader);  
\}  
  
public Enumeration getKeys() \{  
return rb.getKeys();  
\}  
  
public Locale getLocale() \{  
return rb.getLocale();  
\}  
  
public Object getObject(String key) \{  
return rb.getObject(key);  
\}  
  
public String getString(String key) \{  
return rb.getString(key);  
\}  
  
public String\[\] getStringArray(String key) \{  
return rb.getStringArray(key);  
\}  
  
protected Object handleGetObject(String key) \{  
return ((PropertyResourceBundle) rb).handleGetObject(key);  
\}  
  
\}  
  
\}  
  
JPropertiesTest.java文件  
  
  
package com.kindani.test;  
  
import junit.framework.\*;  
import com.kindani.JProperties;  
  
//import javax.servlet.ServletContext;  
import java.util.Properties;  
  
public class JPropertiesTest extends TestCase \{  
JProperties jProperties;  
String key = "helloworld.title";  
String value = "Hello World!";  
  
public void testLoadProperties() throws Exception \{  
String name = null;  
Properties p = new Properties();  
  
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 1.1 2000/08/17 00:57:52 horwat Exp $  
  
\# Default localized resources for example 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 this request:  
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

package com.yorsun;

import java.io.File;  
import java.io.FileInputStream;  
import java.io.FileNotFoundException;  
import java.io.FileOutputStream;  
import java.io.IOException;  
import java.util.Properties;

import javax.servlet.ServletContext;  
import javax.servlet.http.HttpServlet;

public class PropertiesUnit \{  
private String filename;

private Properties p;

private FileInputStream in;

private FileOutputStream out;

public PropertiesUnit(String filename) \{  
this.filename = filename;  
File file = new File(filename);  
try \{  
in = new FileInputStream(file);  
p = new Properties();  
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();  
\}  
\}

public static String getConfigFile(HttpServlet hs) \{  
return getConfigFile(hs, "config.properties");  
\}

private static 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  
return configFile;  
\}

public void list() \{  
p.list(System.out);  
\}

public String getValue(String itemName) \{  
return p.getProperty(itemName);  
\}

public String getValue(String itemName, String defaultValue) \{  
return p.getProperty(itemName, defaultValue);  
\}

public void setValue(String itemName, String value) \{  
p.setProperty(itemName, value);  
\}

public void saveFile(String filename, String description) throws Exception \{  
try \{  
File f = new File(filename);  
out = new FileOutputStream(f);  
p.store(out, description);  
out.close();  
\} catch (IOException ex) \{  
throw new Exception("无法保存指定的配置文件:" + filename);  
\}  
\}  
  
public void saveFile(String filename) throws Exception\{  
saveFile(filename,"");  
\}  
  
public void saveFile() throws Exception\{  
if(filename.length()==0)  
throw new Exception("需指定保存的配置文件名");  
saveFile(filename);  
\}  
  
public void deleteValue(String value)\{  
p.remove(value);  
\}  
  
public static 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=new PropertiesUnit(file);  
pu.list();  
\}

\--------------------------------------------------------------------------------------------------------------------------------------------------------------------

package com.test.TestClass;

import java.io.BufferedInputStream;  
import java.io.File;  
import java.io.FileInputStream;  
import java.io.FileNotFoundException;  
import java.io.IOException;  
import java.io.InputStream;  
import java.util.Properties;

public class ReadPropertiesFile ...\{

public void readPropertiesFile(String fileName) throws FileNotFoundException ...\{  
String str = "";  
Properties prop = new Properties();  
  
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 = new BufferedInputStream(new FileInputStream(new File(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();  
\}  
\}

public static void main(String\[\] args) throws FileNotFoundException ...\{  
// TODO Auto-generated method stub  
new ReadPropertiesFile().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================================

package com.thtf.ezone.ezesb.jmx.admin.service.impl;

import java.io.FileInputStream;  
import java.io.IOException;  
import java.util.Properties;

public class UserServiceImpl implements UserService \{  
  
String filePath = null;

public void setFilePath(String filePath) \{  
this.filePath = filePath;  
\}

public static void main(String dd\[\])throws Exception\{  
  
Properties p = new Properties();  
FileInputStream ferr=new FileInputStream((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