簡析Properties對*.xml文件的讀取與寫入

test.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE properties SYSTEM "http://java.sun.com/dtd/properties.dtd">
<properties>
	<entry key="key1">value值1</entry>
	<entry key="key2">value2</entry>
</properties>

java解析代碼：

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.PrintStream;
import java.util.Properties;

public class xmlTest {

	public static void main(String[] args) {
		try {
//			讀取*.xml文件
			FileInputStream stream = new FileInputStream("conf/test.xml");
			Properties properties = new Properties();
			properties.loadFromXML(stream);
//			1、讀取整個*.xml文件內容
			properties.list(System.out);
//			2、按鍵值對的方式讀取
			String name = properties.getProperty("key1");
			System.out.println(name);//value值1
//			3、循環遍歷讀取
			for(Object obj:properties.keySet()){
				String key = (String)obj;
				String value = properties.getProperty(key);
				System.out.println("key:"+key+",value:"+value);
			}
			
//			寫入並保存*.xml文件
			properties.setProperty("key2","modifyValue2");//改變配置文件中的值
			properties.put("key3", "value值3");//增加鍵值對
			PrintStream print = new PrintStream(new File("conf/testNew2.xml"));//創建新文件
//			通過storeToXML方法將xml內容寫入.xml文件
			properties.storeToXML(print,"test");//配置文件中增加<comment>test</comment>
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
}

執行結果：

新創建的testNew2.xml內容

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE properties SYSTEM "http://java.sun.com/dtd/properties.dtd">
<properties>
<comment>test</comment>
<entry key="key3">value值3</entry>
<entry key="key2">modifyValue2</entry>
<entry key="key1">value值1</entry>
</properties>