J2EE之ServletContext讀取資源檔

標籤：

ServletContext讀取資源檔內容的方式有兩種：

方法1.

public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {InputStream in = this.getServletContext().getResourceAsStream("/WEB-INF/classes/data.properties");Properties pros = new Properties();pros.load(in);String username = pros.getProperty("username");String password = pros.getProperty("password");System.out.println("username = " + username);System.out.println("password = " + password);}

這裡須要注意的是data.properties檔案的位置在Myeclipse的src檔案夾下，為啥getResourceAsStream方法傳入的參數確實"/WEB-INF/classes/data.properties"

這是由於這些代碼有webserver運行，當項目公布以後。data.properties檔案就會被放到tomcat安裝檔案所在目錄下。

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所以這裡傳入參數就解釋清楚了。

方法2

public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {String path = this.getServletContext().getRealPath("/WEB-INF/classes/data.properties");FileInputStream in = new FileInputStream(path);Properties pros = new Properties();pros.load(in);String username = pros.getProperty("username");String password = pros.getProperty("password");System.out.println("username = " + username);System.out.println("password = " + password);}

這裡首先通過getRealPath方法擷取data.properties檔案的絕對路徑，然後通過FileInputStream擷取檔案流。

J2EE之ServletContext讀取資源檔