Java中有個比較重要的類Properties(Java.util.Properties),主要用于讀取Java的配置文件,各種語言都有自己所支 持的配置文件,配置文件中很多變量是經常改變的,這樣做也是為了方便用戶,讓用戶能夠脫離程序本身去修改相關的變量設置。今天,我們就開始Properties的使用。
Java中Properties的使用
Properties的文檔說明:
The Properties class represents a persistent set of properties. The Properties can be saved to a stream or loaded from a stream. Each key and its corresponding value in the property list is a string.
Properties類的描述:
public class Properties extends Hashtable<Object,Object>
測試的項目結構如下:

一、在huhx.properties文件中,我們為也方便,加入一條數據:
name=huhx
二、將huhx.properties文件加載讀取,得到相應的屬性
Properties properties = new Properties();FileInputStream fis = new FileInputStream("huhx.properties");properties.load(fis);System.out.println(properties.get("name")); 三、Properties的list方法的使用
PrintStream printStream = System.out;properties.list(printStream);
list方法的具體代碼:
public void list(PrintStream out) {out.println("-- listing properties --");Hashtable h = new Hashtable();enumerate(h);for (Enumeration e = h.keys() ; e.hasMoreElements() ;) {String key = (String)e.nextElement();String val = (String)h.get(key);if (val.length() > 40) {val = val.substring(0, 37) + "...";}out.println(key + "=" + val);}}四、Properties的store方法的使用
OutputStream outputStream = new FileOutputStream("huhx.txt");properties.store(outputStream, "comments"); 五、Properties的storeToXML方法的使用
OutputStream outputStream2 = new FileOutputStream("huhx.xml");properties.storeToXML(outputStream2, "comments"); 六、最終生成的文件如下:
huhx.txt:
#comments#Thu May 19 19:19:36 CST 2016name=huhx
huhx.xml:
<?xml version="1.0" encoding="UTF-8" standalone="no"?><!DOCTYPE properties SYSTEM "http://java.sun.com/dtd/properties.dtd"><properties><comment>comments</comment><entry key="name">huhx</entry></properties>
友情鏈接,PropertiesTest.java:
package com.huhx.linux;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.OutputStream;import java.io.PrintStream;import java.util.Properties;public class PropertiesTest {public static void main(String[] args) throws Exception {// 一般Properties的使用Properties properties = new Properties();FileInputStream fis = new FileInputStream("huhx.properties");properties.load(fis);System.out.println(properties.get("name"));// 以下是測試的部分PrintStream printStream = System.out;properties.list(printStream);OutputStream outputStream = new FileOutputStream("huhx.txt");properties.store(outputStream, "comments");OutputStream outputStream2 = new FileOutputStream("huhx.xml");properties.storeToXML(outputStream2, "comments");}}以上所述是小編給大家介紹的Java中Properties的使用詳解,希望對大家有所幫助,如果大家有任何疑問請給我留言,小編會及時回復大家的。在此也非常感謝大家對武林網網站的支持!
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