Properties属性文件操作类

package test;

import java.io.BufferedInputStream;
import java.io.File;

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 TestMain {

// 根据key读取value
public static String readValue(String filePath, String key) {
Properties props = new Properties();
try {
// InputStream in = new BufferedInputStream(new FileInputStream(filePath));
InputStream in = new BufferedInputStream(TestMain.class.getResourceAsStream(filePath));
props.load(in);
String value = props.getProperty(key);
System.out.println(value);
return value;

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

// 读取properties的全部信息

public static void readProperties(String filePath) {
Properties props = new Properties();
try {
// InputStream in = new BufferedInputStream(new FileInputStream(filePath));
InputStream in = new BufferedInputStream(TestMain.class.getResourceAsStream(filePath));
props.load(in);
Enumeration en = props.propertyNames();
while (en.hasMoreElements()) {
String key = (String) en.nextElement();
String Property = props.getProperty(key);
System.out.println(Property);
}
} catch (Exception e) {
e.printStackTrace();
}

}

// 写入properties信息

public static void writeProperties(String filePath, String parameterName,String parameterValue) {
Properties prop = new Properties();
String path = null;
try {
// InputStream fis = new FileInputStream(filePath);
InputStream fis = TestMain.class.getResourceAsStream(filePath);
// 从输入流中读取属性列表(键和元素对)
prop.load(fis);
// 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。
path = "conf/"+filePath;
OutputStream fos = new FileOutputStream(new File(path));
prop.setProperty(parameterName, parameterValue);
// 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
prop.store(fos, "Update '" + parameterName + "' value");
} catch (IOException e) {
System.err.println("Visit " + path + " for updating "
+ parameterName + " value error");
}

}

public static void main(String[] args) {

readValue("/test/info.properties", "url");

writeProperties("info.properties", "age1", "221");
//
// readProperties("info.properties");

System.out.println("OK");

}

}