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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>1.3. Properties</title><link rel="stylesheet" type="text/css" href="..//docbook.css" /><meta name="generator" content="DocBook XSL Stylesheets V1.79.1" /><link rel="home" href="../index.html" title="Netkiller Java 手札" /><link rel="up" href="index.html" title="第 1 章 Java" /><link rel="prev" href="system.html" title="1.2. System" /><link rel="next" href="type.html" title="1.4. 类型" /></head><body><a xmlns="" href="http://www.netkiller.cn/">Home</a> |
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<a xmlns="" href="mailto:[email protected]">Email</a><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">1.3. Properties</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="system.html">上一页</a> </td><th width="60%" align="center">第 1 章 Java</th><td width="20%" align="right"> <a accesskey="n" href="type.html">下一页</a></td></tr></table><hr /></div><table xmlns=""><tr><td><iframe src="http://ghbtns.com/github-btn.html?user=netkiller&repo=netkiller.github.io&type=watch&count=true&size=large" height="30" width="170" frameborder="0" scrolling="0" style="width:170px; height: 30px;" allowTransparency="true"></iframe></td><td><iframe src="http://ghbtns.com/github-btn.html?user=netkiller&repo=netkiller.github.io&type=fork&count=true&size=large" height="30" width="170" frameborder="0" scrolling="0" style="width:170px; height: 30px;" allowTransparency="true"></iframe></td><td><iframe src="http://ghbtns.com/github-btn.html?user=netkiller&type=follow&count=true&size=large" height="30" width="240" frameborder="0" scrolling="0" style="width:240px; height: 30px;" allowTransparency="true"></iframe></td></tr></table><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="properties"></a>1.3. Properties</h2></div></div></div>
<pre class="programlisting">
package cn.netkiller.config;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Properties;
public class Config {
public static void main(String[] args) {
// TODO Auto-generated method stub
Properties prop = new Properties();
OutputStream output = null;
try {
output = new FileOutputStream("config.properties");
// set the properties value
prop.setProperty("host", "localhost");
prop.setProperty("port", "8000");
prop.setProperty("user", "neo");
prop.setProperty("pass", "password");
// save properties to project root folder
prop.store(output, null);
} catch (IOException io) {
io.printStackTrace();
} finally {
if (output != null) {
try {
output.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}
</pre>
<p>getProperty 取出key的值</p>
<pre class="programlisting">
package cn.netkiller.config;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;
public class LoadConfig {
public static void main(String[] args) {
// TODO Auto-generated method stub
Properties prop = new Properties();
InputStream input = null;
try {
input = new FileInputStream("config.properties");
// load a properties file
prop.load(input);
// get the property value and print it out
System.out.println(prop.getProperty("host"));
System.out.println(prop.getProperty("port"));
System.out.println(prop.getProperty("user"));
System.out.println(prop.getProperty("pass"));
} catch (IOException ex) {
ex.printStackTrace();
} finally {
if (input != null) {
try {
input.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}
</pre>
<p>循环打印所有 Properties 内容</p>
<pre class="programlisting">
package test;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Enumeration;
import java.util.Properties;
public class Application {
public static void main(String[] args) {
Application app = new Application();
app.config();
}
private void config() {
Properties prop = new Properties();
InputStream input = null;
try {
String filename = "config.properties";
prop.load(new FileInputStream(filename));
Enumeration<?> e = prop.propertyNames();
while (e.hasMoreElements()) {
String key = (String) e.nextElement();
String value = prop.getProperty(key);
System.out.println(key + ": " + value);
}
} catch (IOException ex) {
ex.printStackTrace();
} finally {
if (input != null) {
try {
input.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}
</pre>
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