Java读取资源文件

读取资源文件的种方法- -

如何读取资源文件：
（一）

The java code:

代码后运行！">

Properties props = 
new
 Properties();
props.load(new
 FileInputStream(
"db.properties"
));

Properties props = new Properties(); 
props.load(new FileInputStream("db.properties")); 

（二）
blog.properties文件如下

The java code:

dbdriver=oracle.jdbc.driver.OracleDriver
dburl=jdbc:oracle:thin:@127
.0.
0.1
:
1521
:ora92
dbuser=blog
dbpwd=blog
--------------
public
 
class
 Config {
  public
 Config() {
    this
.initDBConfig();
  }
  public
 String DBdriver;
  public
 String DBuser;
  public
 String DBpwd;
  public
 String DBurl;
  private
 
void
 initDBConfig() {
    try
 {
      ResourceBundle bundle = ResourceBundle.getBundle("blog"
);
      DBdriver = bundle.getString("dbdriver"
);
      DBurl = bundle.getString("dburl"
);
      DBuser = bundle.getString("dbuser"
);
      DBpwd = bundle.getString("dbpwd"
);
    }
    catch
 (Exception ex) {
      ex.printStackTrace();
    }
  }
}
----------------
public
 
class
 DAO {
  public
 DAO() {
  }
  public
 Connection getConnection() {
    Connection conn = null
;
    Config config = new
 Config();
    String DBdriver = config.DBdriver;
    String DBuser = config.DBuser;
    String DBpwd = config.DBpwd;
    String DBurl = config.DBurl;
    try
 {
      Class.forName(DBdriver);
      conn = DriverManager.getConnection(DBurl, DBuser, DBpwd);
    }
    catch
 (Exception ex) {
      System.out.println("********************"
);
      System.out.println("不能得到数据库连接"
);
      System.out.println("DBdriver: "
 + DBdriver);
      System.out.println("DBuser: "
 + DBuser);
      System.out.println("DBpwd: "
 + DBpwd);
      System.out.println("DBurl: "
 + DBurl);
      ex.printStackTrace();
    }
    return
 conn;
  }
}

 
dbdriver=oracle.jdbc.driver.OracleDriver   
dburl=jdbc:oracle:thin:@127.0.0.1:1521:ora92   
dbuser=blog   
dbpwd=blog   
--------------   
public class Config {   
  public Config() {   
    this.initDBConfig();   
  }   
  public String DBdriver;   
  public String DBuser;   
  public String DBpwd;   
  public String DBurl;   
  private void initDBConfig() {   
    try {   
      ResourceBundle bundle = ResourceBundle.getBundle("blog");   
      DBdriver = bundle.getString("dbdriver");   
      DBurl = bundle.getString("dburl");   
      DBuser = bundle.getString("dbuser");   
      DBpwd = bundle.getString("dbpwd");   
    }   
    catch (Exception ex) {   
      ex.printStackTrace();   
    }   
  }   
}   
----------------   
public class DAO {   
  public DAO() {   
  }   
  public Connection getConnection() {   
    Connection conn = null;   
    Config config = new Config();   
    String DBdriver = config.DBdriver;   
    String DBuser = config.DBuser;   
    String DBpwd = config.DBpwd;   
    String DBurl = config.DBurl;   
    try {   
      Class.forName(DBdriver);   
      conn = DriverManager.getConnection(DBurl, DBuser, DBpwd);   
    }   
    catch (Exception ex) {   
      System.out.println("********************");   
      System.out.println("不能得到数据库连接");   
      System.out.println("DBdriver: " + DBdriver);   
      System.out.println("DBuser: " + DBuser);   
      System.out.println("DBpwd: " + DBpwd);   
      System.out.println("DBurl: " + DBurl);   
      ex.printStackTrace();   
    }   
    return conn;   
  }   
}  

（三）

The java code:

Properties props=new
 Properties();
props.load(BugFactory.class
.getResourceAsStream(
"xx.properties"
));
String name = props.getPropery("xxxx"
);

 
Properties props=new Properties();   
props.load(BugFactory.class.getResourceAsStream("xx.properties"));   
String name = props.getPropery("xxxx");  

此时xx.properties应该与该类放在同一个目录.
（四）

The java code:

ResourceBundle res = ResourceBundle.getBundle(
"yy.properties"
);
String name = res.getString("yyyy"
);

 ResourceBundle res = ResourceBundle.getBundle("yy.properties");   
 String name = res.getString("yyyy");  

yy.properties应放在/WEB-INF/classes目录（五）
如果你这个Bean打包的话，就把这个文件放在包内。
我一般是这样写的

The java code:

 Properties prop = 
new
 Properties();
try
{
 InputStream is = getClass().getResourceAsStream("db.properties"
);
 prop.load(is);
 if
(is!=
null
)
    is.close();
}

 Properties prop = new Properties();   
try  
{   
 InputStream is = getClass().getResourceAsStream("db.properties");   
 prop.load(is);   
 if(is!=null)   
    is.close();   
}  

另：

The java code:

 props.load(
new
 FileInputStream(
"db.properties"
)); 是读取当前目录的db.properties文件
getClass.getResourceAsStream("db.properties"
); 是读取当前类所在位置一起的db.properties文件
getClass.getResourceAsStream("/db.properties"
); 是读取ClassPath的根的db.properties文件,注意

 props.load(new FileInputStream("db.properties")); 是读取当前目录的db.properties文件   
getClass.getResourceAsStream("db.properties"); 是读取当前类所在位置一起的db.properties文件   
getClass.getResourceAsStream("/db.properties"); 是读取ClassPath的根的db.properties文件,注意  

ClassPath如果是多个路径或者jar文件的,只要在任意一个路径目录下或者jar文件里的根下都可以,如果存在于多个路径下的话,按照ClassPath中的先后顺序,使用先找到的,其余忽略.