学步园

properties文件读写 自己写的几个方法

/**<br /> * 描述：数据库初始化基本类<br /> *<br /> * @作者 王群<br /> * @创建日期 2010-04-08<br /> * @修改人 xxx<br /> * @修改日期 xxx<br /> * @检查人 xxx<br /> * @检查日期 xxx<br /> */<br /> import java.sql.SQLException;</p> <p>import com.ibatis.sqlmap.client.SqlMapClient;<br /> import com.oumasoft.bstmanage.ibatis.SqlMapConfig;<br /> import com.oumasoft.bstmanage.ibatis.data.JsgnPo;<br /> import com.oumasoft.bstmanage.ibatis.data.Test;</p> <p>import java.util.*;<br /> import org.w3c.dom.*;<br /> import java.io.*;<br /> import javax.servlet.http.HttpServletRequest;<br /> import javax.xml.transform.stream.*;<br /> import org.w3c.dom.*;<br /> import javax.xml.transform.*;<br /> import javax.xml.parsers.*;<br /> import javax.xml.transform.dom.*;<br /> import org.apache.log4j.Logger;<br /> import com.oumasoft.bstmanage.ibatis.dao.ClientDao;</p> <p>public class InitDBDao{<br /> static Logger logger = Logger.getLogger(ClientDao.class.getName());<br /> static SqlMapClient sqlMap = null;<br /> private static File file = null;//读写文件<br /> private static DocumentBuilderFactory factory = null;<br /> private static DocumentBuilder builder = null;</p> <p> /**<br /> * 修改properties文件,参数是map键值集合,根据键修改值,如果没有键值对就创建<br /> * @param filePath 文件路径<br /> * @param keyVal 内容参数<br /> * @param over是否覆盖，true的话就覆盖，false的话就是更新<br /> * @return<br /> */<br /> public static boolean writeProperties(String filePath, Map<String, String> keyVal ,boolean over) {<br /> boolean flag = false;<br /> Properties props = new Properties();<br /> InputStream ips = null;<br /> try {<br /> ips = new BufferedInputStream(new FileInputStream(filePath));<br /> props.load(ips);<br /> } catch (FileNotFoundException e) {<br /> // TODO Auto-generated catch block<br /> e.printStackTrace();<br /> } catch (IOException e) {<br /> // TODO Auto-generated catch block<br /> e.printStackTrace();<br /> } finally {<br /> try {<br /> ips.close();<br /> } catch (IOException e) {<br /> // TODO Auto-generated catch block<br /> e.printStackTrace();<br /> logger.error("输入关闭出错");<br /> }</p> <p> }</p> <p> OutputStream fos = null;<br /> if (over) {<br /> // 将新添加的内容覆盖原来的内容<br /> try {<br /> fos = new FileOutputStream(filePath);<br /> // 将keys转换成数组<br /> // 将键值逐一添加到property中<br /> for (Object str : keyVal.keySet().toArray()) {<br /> props.setProperty(str.toString(), keyVal.get(str));<br /> }<br /> props.store(fos, "set");<br /> flag = true;<br /> } catch (IOException e) {<br /> e.printStackTrace();<br /> } finally {<br /> try {<br /> fos.close();<br /> } catch (IOException e) {<br /> // TODO Auto-generated catch block<br /> e.printStackTrace();<br /> logger.error("输出流无法关闭");<br /> }<br /> }<br /> }else{<br /> try {<br /> fos = new FileOutputStream(filePath);<br /> for (Object key : keyVal.keySet().toArray()) {<br /> props.setProperty(key.toString(), keyVal.get(key).toString());<br /> }<br /> props.store(fos,"");<br /> flag = true;<br /> } catch (FileNotFoundException e) {<br /> // TODO Auto-generated catch block<br /> e.printStackTrace();<br /> } catch (IOException e) {<br /> // TODO Auto-generated catch block<br /> e.printStackTrace();<br /> }<br /> finally {<br /> try {<br /> fos.close();<br /> } catch (IOException e) {<br /> // TODO Auto-generated catch block<br /> e.printStackTrace();<br /> logger.error("输出流关闭出错");<br /> }<br /> }<br /> }<br /> return flag;<br /> }</p> <p> /**<br /> * properties文件按键得值<br /> *<br /> * @param filePath properties 文件的路径<br /> * @param key 要取值的键<br /> * @return 得到的值<br /> */<br /> public static String readValue(String filePath, String key) {<br /> Properties props = new Properties();<br /> InputStream ips = null;<br /> try {<br /> ips = new BufferedInputStream(new FileInputStream(filePath));<br /> props.load(ips);<br /> String value = props.getProperty(key);<br /> return value;<br /> } catch (FileNotFoundException e) {<br /> e.printStackTrace();<br /> return null;<br /> } catch (IOException e) {<br /> e.printStackTrace();<br /> return null;<br /> } finally {<br /> try {<br /> if(null != ips){<br /> ips.close();<br /> }<br /> } catch (IOException e) {<br /> e.printStackTrace();<br /> }<br /> }<br /> }</p> <p>}<br />

properties文件调用路径的三种方法

1.方法一
InputStream fis =TestProperties.class.getClassLoader().getResourceAsStream("init.properties")

2.方法二(要求TestProperties和init.properties在同一目录下)
InputStream fis =TestProperties.class.getResourceAsStream("init.properties")

3.方法三，对于Web工程也可以这样。
先获取ServletContext,然后
InputStream in=context.getResourceAsStream("/WEB-INF/classes/init.properties");