[转]Java读取Properties文件的六种方法

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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，可以参考附件文件如何上传文件，谁知道请告诉以下。只好把source都贴上来了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 classpublic 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_UShelloworld.title=Hello World!requestinfo.title=Request Information Examplerequestinfo.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 Examplerequestparams.title=Request Parameters Examplerequestparams.params-in-req=Parameters in this request:requestparams.no-params=No Parameters, Please enter somerequestparams.firstname=First Name:requestparams.lastname=Last Name:cookies.title=Cookies Examplecookies.cookies=Your browser is sending the following cookies:cookies.no-cookies=Your browser isn't sending any cookiescookies.make-cookie=Create a cookie to send to your browsercookies.name=Name:cookies.value=Value:cookies.set=You just sent the following cookie to your browser:sessions.title=Sessions Examplesessions.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 sessionsessions.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 blockSystem.err.println("配置文件config.properties找不到！");e.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blockSystem.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 stubreturn 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 blocke.printStackTrace();}}public static void main(String[] args) throws FileNotFoundException ...{// TODO Auto-generated method stubnew ReadPropertiesFile().readPropertiesFile("config.properties");}}--------------------------------------------------------------------------------------------------------------------------------------//=================sprin配置文件================================//=================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=mssqlDataBaseHost=127.0.0.1:1433DataBase=formproUserName=saPassWord=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:=01DataBaseHost:=127.0.0.1:1433DataBase:=formprodp.sd.DataBaseTyp:=mssqlUserName:=sa