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   1: MyCharsetFilter.java 編碼過(guò)濾器

   2: package ...;

   3: import ...;

   4:  

   5: // 主要目的：過(guò)濾字符編碼；其次，做一些應用邏輯判斷等.

   6: // Filter跟web應用一起啟動(dòng)

   7: // 當web應用重新啟動(dòng)或銷(xiāo)毀時(shí)，Filter也被銷(xiāo)毀

   8: public class MyCharsetFilter implements Filter {

   9:     private FilterConfig config = null;

  10:     

  11:     public void destroy() {

  12:         System.out.println("MyCharsetFilter準備銷(xiāo)毀...");

  13:     }

  14:  

  15:     public void doFilter(ServletRequest arg0, ServletResponse arg1,

  16:             FilterChain chain) throws IOException, ServletException {

  17:         // 強制類(lèi)型轉換

  18:         HttpServletRequest request = (HttpServletRequest)arg0;

  19:         HttpServletResponse response = (HttpServletResponse)arg1;

  20:         // 獲取web.xm設置的編碼集，設置到Request、Response中

  21:         request.setCharacterEncoding(config.getInitParameter("charset"));

  22:         response.setContentType(config.getInitParameter("contentType"));

  23:         response.setCharacterEncoding(config.getInitParameter("charset"));

  24:         

  25:         // 將請求轉發(fā)到目的地

  26:         chain.doFilter(request, response);

  27:     }

  28:  

  29:     public void init(FilterConfig arg0) throws ServletException {

  30:         this.config = arg0;

  31:         System.out.println("MyCharsetFilter初始化...");

  32:     }

  33: }

   1: <filter>

   2:       <filter-name>filter</filter-name>

   3:       <filter-class>dc.gz.filters.MyCharsetFilter</filter-class>

   4:       <init-param>

   5:           <param-name>charset</param-name>

   6:           <param-value>UTF-8</param-value>

   7:       </init-param>

   8:       <init-param>

   9:           <param-name>contentType</param-name>

  10:           <param-value>text/html;charset=UTF-8</param-value>

  11:       </init-param>

  12:   </filter>

  13:   <filter-mapping>

  14:       <filter-name>filter</filter-name>

  15:       <!-- * 代表截獲所有的請求  或指定請求/test.do  /xxx.do -->

  16:       <url-pattern>/*</url-pattern>

  17:   </filter-mapping>

   1: MyServletContextListener.java

   2: package dc.gz.listeners;

   3: import javax.servlet.ServletContext;

   4: import javax.servlet.ServletContextEvent;

   5: import javax.servlet.ServletContextListener;

   6: import org.apache.commons.dbcp.BasicDataSource;

   7:  

   8: /**

   9:  * Web應用監聽(tīng)器

  10:  */

  11: public class MyServletContextListener implements ServletContextListener {

  12:  

  13:     // 應用監聽(tīng)器的銷(xiāo)毀方法

  14:     public void contextDestroyed(ServletContextEvent event) {

  15:         ServletContext sc = event.getServletContext();

  16:         // 在整個(gè)web應用銷(xiāo)毀之前調用，將所有應用空間所設置的內容清空

  17:         sc.removeAttribute("dataSource");

  18:         System.out.println("銷(xiāo)毀工作完成...");

  19:     }

  20:  

  21:     // 應用監聽(tīng)器的初始化方法

  22:     public void contextInitialized(ServletContextEvent event) {

  23:         // 通過(guò)這個(gè)事件可以獲取整個(gè)應用的空間

  24:         // 在整個(gè)web應用下面啟動(dòng)的時(shí)候做一些初始化的內容添加工作

  25:         ServletContext sc = event.getServletContext();

  26:         // 設置一些基本的內容；比如一些參數或者是一些固定的對象

  27:         // 創(chuàng  )建DataSource對象，連接池技術(shù) dbcp

  28:         BasicDataSource bds = new BasicDataSource();

  29:         bds.setDriverClassName("com.mysql.jdbc.Driver");

  30:         bds.setUrl("jdbc:mysql://localhost:3306/hibernate");

  31:         bds.setUsername("root");

  32:         bds.setPassword("root");

  33:         bds.setMaxActive(10);//最大連接數

  34:         bds.setMaxIdle(5);//最大管理數

  35:         //bds.setMaxWait(maxWait); 最大等待時(shí)間

  36:         // 把 DataSource 放入ServletContext空間中，

  37:         // 供整個(gè)web應用的使用(獲取數據庫連接)

  38:         sc.setAttribute("dataSource", bds);

  39:         System.out.println("應用監聽(tīng)器初始化工作完成...");

  40:         System.out.println("已經(jīng)創(chuàng  )建DataSource...");

  41:     }

  42: }

   1: <!-- 配置應用監聽(tīng)器  -->

   2:   <listener>

   3:       <listener-class>dc.gz.listeners.MyServletContextListener</listener-class>

   4:   </listener>