java.util.properties使用总结

public class PropertyUtil...{
    public static void getSysInfo() ...{
        
        Properties properties = new Properties();
        
        // 通过获得系统属性构造属性类 properties 
        properties = System.getProperties();
        properties.list(System.out);
    }

    public void loadFile() ...{
        
        try ...{
            
            Properties properties = new Properties();
            
            // 文件位置:当前package
            properties.load(getClass().getResourceAsStream("test.property"));
            System.err.println(properties.getProperty("key1")+properties.getProperty("key2"));
        } 
        catch (IOException e) ...{
            e.printStackTrace();
        }
    }

public void loadFileByIO() ...{
        
        InputStream in = null;

        try ...{
            
            in = new FileInputStream("TestSource/com/vs/test/test.property");
            Properties properties = new Properties();
            properties.load(in);
            properties.list(System.out);
            System.err.println(properties.getProperty("key1")+properties.getProperty("key2"));
        } 
        catch (IOException e) ...{
            e.printStackTrace();
        }
    }
public void loadXmlFileByIO() ...{
        
        InputStream in = null;

        try ...{
            
            in = new FileInputStream("TestSource/com/vs/test/test.xml");
            Properties properties = new Properties();
            properties.loadFromXML(in);
            properties.list(System.out);
            System.err.println(properties.getProperty("key1")+properties.getProperty("key2"));
        } 
        catch (IOException e) ...{
            e.printStackTrace();
        }
    }
public void storeXmlFileByIO() ...{
        
        OutputStream out = null;
        InputStream in = null;
        try ...{
            
            Properties properties = new Properties();
            properties.setProperty("test", "testStore");
            
            // 写文件时是以覆盖的方式写入的 ,如果不把原文件内容读出来 ,原文件的内容就会丢失 
            // 所以要把原文件的信息先读出来 
            in = new FileInputStream("TestSource/com/vs/test/test.xml");
            properties.loadFromXML(in);
            
            out = new FileOutputStream("TestSource/com/vs/test/test.xml");
            properties.storeToXML(out, "writeToXml");
            properties.list(System.out);
            out.close();
        } 
        catch (IOException e) ...{
            e.printStackTrace();
        }
public void storeFileByIO() ...{
        
        OutputStream out = null;
        InputStream in = null;
        try ...{
            
            Properties properties = new Properties();
            properties.setProperty("test", "testStore");
            
            // 写文件时是以覆盖的方式写入的 ,如果不把原文件内容读出来 ,原文件的内容就会丢失 
            // 所以要把原文件的信息先读出来 
            in = new FileInputStream("TestSource/com/vs/test/test.property");
            properties.load(in);
            
            out = new FileOutputStream("TestSource/com/vs/test/test.property");
            properties.store(out, "writeToXml");
            properties.list(System.out);
            out.close();
        } 
        catch (IOException e) ...{
            e.printStackTrace();
        }


}