Java中讀取配置檔案(properties、xml)
阿新 • • 發佈:2019-02-12
1. 利用java.util提供的工具類Properties
- 首先我這邊有個file.properties檔案
- 然後去讀取這個檔案
注意專案路徑
//注意ProConfigUtil是當前類,也可用this替代
InputStream inputStream = PropConfigUtil.class.getClassLoader()
.getResourceAsStream("config/file.properties");
Properties pro = new Properties();
pro.load(inputStream);
String fileType = pro.getProperty("file.fileType").trim();
完整程式碼
package com.zsl.uploadfile;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;
import org.apache.commons.configuration.ConfigurationException;
public final class ImagePropConfigUtil
{
public ImagePropConfigUtil()
{}
public static class SingleTon
{
private static InputStream inputStream = null;
private static Properties pro = null;
static
{
inputStream = ImagePropConfigUtil.class.getClassLoader().getResourceAsStream(
"config/file.properties" );
pro = new Properties();
try
{
pro.load(inputStream);
}
catch (IOException e)
{
e.printStackTrace();
}
}
}
public static String getVal(String key)
{
return SingleTon.pro.getProperty(key);
}
public static void main(String[] args)
throws ConfigurationException
{
System.out.println("--------------------");
String val = ImagePropConfigUtil.getVal("file.fileType");
System.out.println("-------檔案型別為:\t" + val);
}
}
PropertiesConfiguration prop = new PropertiesConfiguration("config/file.properties");
prop.setDelimiterParsingDisabled(true);
String val = prop.getProperty("image.imageType").toString();
System.out.println(val);
完整程式碼
package com.zsl.uploadfile;
import org.apache.commons.configuration.ConfigurationException;
import org.apache.commons.configuration.PropertiesConfiguration;
public class Util
{
public Util()
{}
public static class Single
{
private static PropertiesConfiguration prop = null;
static
{
try
{
prop = new PropertiesConfiguration("config/file.properties");
prop.setDelimiterParsingDisabled(true);
}
catch (ConfigurationException e)
{
System.out.println(e.getMessage());
e.printStackTrace();
}
}
}
public static String getVal(String key)
{
String value = Single.prop.getProperty(key).toString();
return value;
}
public static void main(String[] args)
{
System.out.println(Util.getVal("file.fileType"));
}
}
上面這兩種方法就可以讀取配置檔案。相比較而言比較高效率的讀取配置檔案,模擬單例模式,程式只調用一次,
列印結果如下: