Java的properties文件读取和属性修改

package Test;

import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Enumeration;
import java.util.Properties;

public class AttributesrUtils{

//根据属性Key读取属性Value
public static String AttributesRead(String filePath, String key) {
Properties properties= new Properties();
try {
InputStream in = new BufferedInputStream (new FileInputStream(filePath));
properties.load(in);
String value = properties.getProperty(key);
System.out.println(key + " = " + value);
return value;

}catch (IOException e) {
e.printStackTrace();
return null;
}
}

//读取Properties的全部信息
public static void GetAllProperties(String filePath) throws IOException {
Properties properties= new Properties();
InputStream in = new BufferedInputStream(new FileInputStream(filePath));
pps.load(in);
Enumeration en = properties.propertyNames(); //得到配置文件的名字

while(en.hasMoreElements()) {
String strKey = (String) en.nextElement();
String strValue = properties.getProperty(strKey);
System.out.println(strKey + "=" + strValue);
}

//写入Properties信息
public static void WriteProperties (String filePath, String pKey, String pValue) throws IOException {
Properties pps = new Properties();

InputStream in = new FileInputStream(filePath);
//从输入流中读取属性列表（键和元素对）
pps.load(in);
//调用 Hashtable 的方法 put。使用 getProperty 方法提供并行性。
//强制要求为属性的键和值使用字符串。返回值是 Hashtable 调用 put 的结果。
OutputStream out = new FileOutputStream(filePath);
pps.setProperty(pKey, pValue);
//以适合使用 load 方法加载到 Properties 表中的格式，
//将此 Properties 表中的属性列表（键和元素对）写入输出流
pps.store(out, "Update " + pKey + " name");
}

public static void main(String [] args) throws IOException{
String value = GetValueByKey("data/config.properties", "name");
System.out.println(value);
GetAllProperties("data/config.properties");
WriteProperties("data/config.properties","long", "212");
}