propert文件增删改查-蒲公英云

propert文件增删改查

============= 增删改查祝你好运 ===========================

public static void main(String args[]) throws IOException {
Properties prop = new Properties();
OutputStream out = new FileOutputStream(“D:\\workspace\\JavaStudy\\src\\test\\test.properties”);

/**
* 新增逻辑：
* 1.必须先读取文件原有内容
* 2.增加新的记录以后，再一起保存
*/
//1.先读取文件原有内容
Map toSaveMap = new HashMap();
Set keys = prop.keySet();
for(Iterator itr = keys.iterator(); itr.hasNext();){
String key = (String) itr.next();
Object value = prop.get(key);
toSaveMap.put(key, value);
}
//2.增加你需要增加的属性内容
toSaveMap.put(“name”, “zhang san”);
toSaveMap.put(“age”, “25”);
prop.putAll(toSaveMap);
prop.store(out, “==== after add ====”);

/**
* 修改逻辑：重新设置对应Key的值即可，非常简单
*/
prop.clear();
toSaveMap.put(“name”, “li si”);
toSaveMap.put(“age”, “26”);
prop.putAll(toSaveMap);
prop.store(out, “==== after modify ====”);

/**
* 删除逻辑：找到对应的key，删除即可
*/
prop.clear();
toSaveMap.remove(“name”);
prop.putAll(toSaveMap);
prop.store(out, “==== after remove ====”));

/**
* 查询逻辑：你是知道滴
*/
InputStream in = new FileInputStream(“D:\\workspace\\JavaStudy\\src\\test\\test.properties”);
prop.load(in);
System.out.println(“name: “ + prop.get(“name”));
System.out.println(“age: “ + prop.get(“age”));

}

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