Java中讀取資源文件的工具類

1. package com.justsy;
3. import java.io.InputStream;
4. import java.util.Properties;
6. public class PropertiesManager {
8. private String resName = "appstore.properties";
10. private Properties prop = new Properties();
12. public PropertiesManager configuration() {
14. try {
15. InputStream is = PropertiesManager.class.getClassLoader()
16. .getResourceAsStream(resName);
17. prop.load(is);
18. if (is != null)
19. is.close();
20. } catch (Exception e) {
21. System.out.println(e + "file " + resName + " not found");
22. }
23. return this;
24. }
26. public String getPara(String url) {
27. return prop.getProperty(url);
28. }
30. public static void main(String[] args) {
31. PropertiesManager pm = new PropertiesManager().configuration() ;
33. System.out.println(pm.getPara("url"));
34. }
36. }

使用單例進行優化後的工具類

[java]

1. package com.justsy.eas.util;
3. import java.io.IOException;
4. import java.io.InputStream;
5. import java.util.Properties;
7. import org.apache.log4j.Logger;
8. /**
9. * 讀取配置文件
10. */
11. public class PropertiesReader {
12. private Logger logger = Logger.getLogger(Properties.class) ;
13. private Properties properties ;
14. private static PropertiesReader propertiesReader = new PropertiesReader() ;
16. private String resName = "eas.properties" ;
18. // 單例私有化構造方法
19. private PropertiesReader(){
20. InputStream is = PropertiesReader.class.getClassLoader()
21. .getResourceAsStream(resName);
22. properties = new Properties() ;
23. try {
24. properties.load(is);
25. logger.info("加載配置信息！！") ;
26. } catch (IOException e) {
27. logger.warn("加載配置文件出錯！") ;
28. //e.printStackTrace();
29. }
30. }
32. // 得到PropertiesReader的實例
33. public static PropertiesReader getInstance(){
34. if(propertiesReader==null){
35. return new PropertiesReader() ;
36. }
37. return propertiesReader ;
38. }
40. // 返回所有屬性
41. public Properties getProperties(){
42. return this.properties ;
43. }
45. public static void main(String[] args) {
46. Properties properties = PropertiesReader.getInstance().getProperties() ;
47. System.out.println(properties.getProperty("dbaddr"));
48. }
50. }