Java Properties 类读取和修改配置文件信息

来源：互联网发布：json高亮js 编辑：程序博客网时间：2024/06/07 19:36

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.Properties;
/**
* Java读写修改Property文件
* @author xiewanzhi
* @date 2011-4-7上午09:19:03
* @version 1.0
*/
public class PropertiesConfig {
/**
* 根据KEY，读取文件对应的值
* @param filePath 文件路径，即文件所在包的路径，例如：java/util/config.properties
* @param key 键
* @return key对应的值
*/
public static String readData(String filePath, String key) {
//获取绝对路径
filePath = PropertiesConfig.class.getResource("/" + filePath).toString();
//截掉路径的”file:“前缀
filePath = filePath.substring(6);
Properties props = new Properties();
try {
InputStream in = new BufferedInputStream(new FileInputStream(filePath));
props.load(in);
in.close();
String value = props.getProperty(key);
return value;
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
/**
* 修改或添加键值对如果key存在，修改, 反之，添加。
* @param filePath 文件路径，即文件所在包的路径，例如：java/util/config.properties
* @param key 键
* @param value 键对应的值
*/
public static void writeData(String filePath, String key, String value) {
//获取绝对路径
filePath = PropertiesConfig.class.getResource("/" + filePath).toString();
//截掉路径的”file:/“前缀
filePath = filePath.substring(6);
Properties prop = new Properties();
try {
File file = new File(filePath);
if (!file.exists())
file.createNewFile();
InputStream fis = new FileInputStream(file);
prop.load(fis);
//一定要在修改值之前关闭fis
fis.close();
OutputStream fos = new FileOutputStream(filePath);
prop.setProperty(key, value);
//保存，并加入注释
prop.store(fos, "Update '" + key + "' value");
fos.close();
} catch (IOException e) {
System.err.println("Visit " + filePath + " for updating " + value + " value error");
}
}
public static void main(String[] args) {
System.out.println(PropertiesConfig.readData("com/xiewanzhi/property/config.properties", "port"));
// PropertiesConfig.writeData("com/xiewanzhi/property/config.properties", "port", "12345");
}
}
来源： <http://zhizaibide1987.iteye.com/blog/1014308>

properties的配置添加、删除、修改操作

博客分类：

j2ee
jsp/java
Java.Util

Java代码  
public void saveProperties()  
    {  
        try  
        {  
            Properties properties = new Properties();  
  
            Properties p = new Properties();  
            File file = new File("F://test.properties");  
            p.load(new FileInputStream(file));  
            Set<String> pSet = p.stringPropertyNames();  
            Iterator i = pSet.iterator();  
            while(i.hasNext())  
            {  
                String propertiesName = i.next().toString();  
                //删除一个当获取的名称hk相同时，就返回到下一步;break;是退出循环  
                if("hk".equalsIgnoreCase(propertiesName)) continue;  
                properties.setProperty(propertiesName, p.getProperty(propertiesName));  
                //修改  
                if("japan".equalsIgnoreCase(propertiesName))  
                {  
                    properties.setProperty(propertiesName, "123456789");  
                }  
            }  
            properties.setProperty("usa", "美国");      
            properties.setProperty("hk", "香港");   
            properties.setProperty("japan", "日本");                
            properties.setProperty("china", "中国");    
                                                //添加              
            properties.store(new FileOutputStream(file), properties.toString());  
              
        } catch (IOException e)  
        {  
            e.printStackTrace();  
        }  
    }  
 

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