Java读取Properties文件的六种方法

fengfujie 贡献于2013-08-02

作者 蔡程  创建于2012-10-20 07:45:00   修改者蔡程  修改于2012-10-20 07:45:00字数12048

文档摘要:Java读取Properties文件的六种方法
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Java读取Properties文件的六种方法 Java读取properties文件 【转】 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 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================================ //=================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

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