操作属性文件代码,Java代码库,德仔网

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【Java】操作属性文件
作者: / 发布于2011/1/14/ 458
<div><span style="color: #000000">
</span><span style="color: #008000">/*</span><span style="color: #008000">
操作属性文件，可以为我们的程序带来更方便的移植性，下面是一个示例，可以读、写、更改属性
读采用了两种方式，一种是采用Properties类，另外一种是采用资源绑定类ResourceBundle类，
下面是源程序，里面有详细的注释：
</span><span style="color: #008000">*/</span><span style="color: #000000">
</span><span style="color: #0000ff">import</span><span style="color: #000000"> java.io.FileInputStream;
</span><span style="color: #0000ff">import</span><span style="color: #000000"> java.io.FileOutputStream;
</span><span style="color: #0000ff">import</span><span style="color: #000000"> java.io.InputStream;
</span><span style="color: #0000ff">import</span><span style="color: #000000"> java.util.Properties;
</span><span style="color: #0000ff">import</span><span style="color: #000000"> java.util.ResourceBundle;
</span><span style="color: #008000">/**</span><span style="color: #008000">
*对属性文件（xx.properties）的操作
*注：属性文件一定要放在当前工程的根目录下，也就是放在与src目录在同一个目录下（我的JDevelop
*是这样的）
</span><span style="color: #008000">*/</span><span style="color: #000000">
</span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">class</span><span style="color: #000000"> OperatePropertiesFile {
 </span><span style="color: #0000ff">public</span><span style="color: #000000"> OperatePropertiesFile() {
 }
 </span><span style="color: #008000">/**</span><span style="color: #008000">
 *采用Properties类取得属性文件对应值
 *@parampropertiesFileNameproperties文件名，如a.properties
 *@parampropertyName属性名
 *@return根据属性名得到的属性值，如没有返回""
 </span><span style="color: #008000">*/</span><span style="color: #000000">
 </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> String getValueByPropertyName(String propertiesFileName,String propertyName) {
 String s</span><span style="color: #000000">=</span><span style="color: #000000">""</span><span style="color: #000000">;
 Properties p</span><span style="color: #000000">=</span><span style="color: #0000ff">new</span><span style="color: #000000"> Properties();</span><span style="color: #008000">//</span><span style="color: #008000">加载属性文件读取类</span><span style="color: #008000">
</span><span style="color: #000000"> FileInputStream in;
 </span><span style="color: #0000ff">try</span><span style="color: #000000"> {
 </span><span style="color: #008000">//</span><span style="color: #008000">propertiesFileName如test.properties</span><span style="color: #008000">
</span><span style="color: #000000"> in </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #0000ff">new</span><span style="color: #000000"> FileInputStream(propertiesFileName);</span><span style="color: #008000">//</span><span style="color: #008000">以流的形式读入属性文件</span><span style="color: #008000">
</span><span style="color: #000000"> p.load(in);</span><span style="color: #008000">//</span><span style="color: #008000">属性文件将该流加入的可被读取的属性中</span><span style="color: #008000">
</span><span style="color: #000000"> in.close();</span><span style="color: #008000">//</span><span style="color: #008000">读完了关闭</span><span style="color: #008000">
</span><span style="color: #000000"> s</span><span style="color: #000000">=</span><span style="color: #000000">p.getProperty(propertyName);</span><span style="color: #008000">//</span><span style="color: #008000">取得对应的属性值</span><span style="color: #008000">
</span><span style="color: #000000"> } </span><span style="color: #0000ff">catch</span><span style="color: #000000"> (Exception e) {
 e.printStackTrace();
 }
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> s;
 }
 </span><span style="color: #008000">/**</span><span style="color: #008000">
 *采用ResourceBundel类取得属性文件对应值，这个只能够读取，不可以更改及写新的属性
 *@parampropertiesFileNameWithoutPostfixproperties文件名，不带后缀
 *@parampropertyName属性名
 *@return根据属性名得到的属性值，如没有返回""
 </span><span style="color: #008000">*/</span><span style="color: #000000">
 </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> String getValueByPropertyName_(String propertiesFileNameWithoutPostfix,String propertyName) {
 String s</span><span style="color: #000000">=</span><span style="color: #000000">""</span><span style="color: #000000">;
 </span><span style="color: #008000">//</span><span style="color: #008000">如属性文件是test.properties，那此时propertiesFileNameWithoutPostfix的值就是test</span><span style="color: #008000">
</span><span style="color: #000000"> ResourceBundle bundel </span><span style="color: #000000">=</span><span style="color: #000000"> ResourceBundle.getBundle(propertiesFileNameWithoutPostfix);
 s</span><span style="color: #000000">=</span><span style="color: #000000">bundel.getString(propertyName);
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> s;
 }
 </span><span style="color: #008000">/**</span><span style="color: #008000">
*更改属性文件的值，如果对应的属性不存在，则自动增加该属性
*@parampropertiesFileNameproperties文件名，如a.properties
*@parampropertyName属性名
*@parampropertyValue将属性名更改成该属性值
*@return是否操作成功
</span><span style="color: #008000">*/</span><span style="color: #000000">
 </span><span style="color: #0000ff">public</span><span style="color: #000000"> </span><span style="color: #0000ff">static</span><span style="color: #000000"> </span><span style="color: #0000ff">boolean</span><span style="color: #000000"> changeValueByPropertyName(String propertiesFileName,String propertyName,String propertyValue) {
 </span><span style="color: #0000ff">boolean</span><span style="color: #000000"> writeOK</span><span style="color: #000000">=</span><span style="color: #0000ff">true</span><span style="color: #000000">;
 Properties p</span><span style="color: #000000">=</span><span style="color: #0000ff">new</span><span style="color: #000000"> Properties();
 InputStream in;
 </span><span style="color: #0000ff">try</span><span style="color: #000000"> {
 
 in </span><span style="color: #000000">=</span><span style="color: #000000"> </span><span style="color: #0000ff">new</span><span style="color: #000000"> FileInputStream(propertiesFileName);
 p.load(in);</span><span style="color: #008000">//
</span><span style="color: #000000"> in.close();
 p.setProperty(propertyName,propertyValue);</span><span style="color: #008000">//</span><span style="color: #008000">设置属性值，如不属性不存在新建
 </span><span style="color: #008000">//</span><span style="color: #008000">p.setProperty("testProperty","testPropertyValue");</span><span style="color: #008000">
</span><span style="color: #000000"> FileOutputStream out</span><span style="color: #000000">=</span><span style="color: #0000ff">new</span><span style="color: #000000"> FileOutputStream(propertiesFileName);</span><span style="color: #008000">//</span><span style="color: #008000">输出流</span><span style="color: #008000">
</span><span style="color: #000000"> p.store(out,</span><span style="color: #000000">""</span><span style="color: #000000">);</span><span style="color: #008000">//</span><span style="color: #008000">设置属性头，如不想设置，请把后面一个用""替换掉</span><span style="color: #008000">
</span><span style="color: #000000"> out.flush();</span><span style="color: #008000">//</span><span style="color: #008000">清空缓存，写入磁盘</span><span style="color: #008000">
</span><span style="color: #000000"> out.close();</span><span style="color: #008000">//</span><span style="color: #008000">关闭输出流</span><span style="color: #008000">
</span><span style="color: #000000"> } </span><span style="color: #0000ff">catch</span><span style="color: #000000"> (Exception e) {
 e.printStackTrace();
 }
 </span><span style="color: #0000ff">return</span><span style="color: #000000"> writeOK;
 }
}
</span>
</div>
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