java读取Properties文件的方法

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================================

<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