简析Properties对*.xml文件的读取与写入

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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解析代码：

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 {//读取*.xml文件FileInputStream stream = new FileInputStream("conf/test.xml");Properties properties = new Properties();properties.loadFromXML(stream);//1、读取整个*.xml文件内容properties.list(System.out);//2、按键值对的方式读取String name = properties.getProperty("key1");System.out.println(name);//value值1//3、循环遍历读取for(Object obj:properties.keySet()){String key = (String)obj;String value = properties.getProperty(key);System.out.println("key:"+key+",value:"+value);}//写入并保存*.xml文件properties.setProperty("key2","modifyValue2");//改变配置文件中的值properties.put("key3", "value值3");//增加键值对PrintStream print = new PrintStream(new File("conf/testNew2.xml"));//创建新文件//通过storeToXML方法将xml内容写入.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();}}}

执行结果：

新创建的testNew2.xml内容

<?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>

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