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JSP過濾器Filter配置過濾類型全部匯總

一、配置方法

1 映射過濾應用程序中所有資源

filter>
  filter-name>loggerfilter/filter-name>
  filter-class>myfilter.LoggerFilter/filter-class>
/filter>
filter-mapping>
  filter-name>loggerfilter/filter-name>
  url-pattern>/*/url-pattern> //訪問當前主機，當前應用程序根下的所有文件包括多級子目錄下的所有文件，注意這里*前有“/”
/filter-mapping>

2 過濾指定的類型文件資源

filter>
  filter-name>loggerfilter/filter-name>
  filter-class>myfilter.LoggerFilter/filter-class>
/filter>
filter-mapping>
  filter-name>loggerfilter/filter-name>
  url-pattern>*.html/url-pattern> //訪問當前主機，當前應用程序根目錄下的所有html文件，注意：*.html前沒有“/”,否則錯誤
/filter-mapping>

其中*.html要過濾jsp那么就改*.html為*.jsp，但是注意沒有“/”斜杠。如果要同時過濾多種類型資源：

方法1 url-pattern 分開寫

filter>
  filter-name>loggerfilter/filter-name>
  filter-class>myfilter.LoggerFilter/filter-class>
/filter>
filter-mapping>
  filter-name>loggerfilter/filter-name>
  url-pattern>*.html/url-pattern>
/filter-mapping>
filter-mapping>
  filter-name>loggerfilter/filter-name>
  url-pattern>*.jsp/url-pattern>//訪問當前主機，當前應用程序根目錄以所有及子目錄下的所有jsp文件
/filter-mapping>

方法2 將url-pattern合并

filter>
  filter-name>loggerfilter/filter-name>
  filter-class>myfilter.LoggerFilter/filter-class>
/filter>
filter-mapping>
  filter-name>loggerfilter/filter-name>
  url-pattern>*.html;*.jsp/url-pattern>
/filter-mapping>//*.html;*.jsp兩類型之間用分號;間隔

3 過濾指定的目錄下的所有文件

filter>
  filter-name>loggerfilter/filter-name>
  filter-class>myfilter.LoggerFilter/filter-class>
/filter>
filter-mapping>
  filter-name>loggerfilter/filter-name>
  url-pattern>/folder_name/*/url-pattern>//訪問當前主機，當前應用程序根目錄下的folder_name子目錄（可是多級子目錄）下所有文件
/filter-mapping>

4 過濾指定的servlet

filter>
  filter-name>loggerfilter/filter-name>
  filter-class>myfilter.LoggerFilter/filter-class>
/filter>
filter-mapping>
  filter-name>loggerfilter/filter-name>
  servlet-name>loggerservlet/servlet-name>
/filter-mapping>
servlet>
  servlet-name>loggerservlet/servlet-name>
  servlet-class>myfilter.LoggerServlet/servlet-class>
/servlet>

5 過濾指定文件（即單一文件）

filter>
  filter-name>loggerfilter/filter-name>
  filter-class>myfilter.LoggerFilter/filter-class>
/filter>
filter-mapping>
  filter-name>loggerfilter/filter-name>
  url-pattern>/simplefilter.html/url-pattern>
/filter-mapping>

6 過濾指定目錄下的指定類型的所有文件

這種情況下在web.xml中無法一次性配置完成，需要結合filter的實現類

首先在web.xml中配置過濾指定目錄下的所有文件

filter>
  filter-name>loggerfilter/filter-name>
  filter-class>myfilter.LoggerFilter/filter-class>
/filter>
filter-mapping>
  filter-name>loggerfilter/filter-name>
  url-pattern>/dir_name/*/url-pattern>
/filter-mapping>

然后在filter的實現類中的doFilter方法中獲取請求的uri或者url，判斷uri或者url中是否包含指定文件類型的字符串，決定是否過濾

//獲得用戶請求的uri
String uri = request.getRequestURI();
if(uri.contains(".jsp")||uri.contains(".html"))
System.out.println("開始過濾"+url);

7 過濾指定目錄下指定類型的單一文件

filter>
  filter-name>loggerfilter/filter-name>
  filter-class>myfilter.LoggerFilter/filter-class>
/filter>
filter-mapping>
  filter-name>loggerfilter/filter-name>
  url-pattern>/dir_name/index.jsp/url-pattern>
/filter-mapping>

以上都要注意是否有斜杠“/”

二、實例

不緩存文件

filter>
  filter-name>NoCache/filter-name>
  filter-class>com.sys.common.Filters.ResponseHeaderFilter
    /filter-class>
  init-param>
   param-name>Cache-Control/param-name>
   param-value>no-cache, must-revalidate/param-value>
  /init-param>
 /filter>

緩存文件一周

 filter>
  filter-name>CacheForWeek/filter-name>
  filter-class>com.sys.common.Filters.ResponseHeaderFilter
    /filter-class>
  init-param>
   param-name>Cache-Control/param-name>
   param-value>max-age=604800, public/param-value>
  /init-param>
 /filter>
filter-mapping>
  filter-name>CacheForWeek/filter-name>
  url-pattern>/images/*/url-pattern>
 /filter-mapping>
 filter-mapping>
  filter-name>CacheForWeek/filter-name>
  url-pattern>*.js/url-pattern>
 /filter-mapping>
 filter-mapping>
  filter-name>CacheForWeek/filter-name>
  url-pattern>*.css/url-pattern>
 /filter-mapping>

自定義的filter：

public class ResponseHeaderFilter implements Filter {
  FilterConfig fc;
  public void doFilter(ServletRequest req, ServletResponse res,FilterChain chain) throws IOException, ServletException {
    HttpServletResponse response = (HttpServletResponse) res;
    for (Enumeration e = fc.getInitParameterNames(); e.hasMoreElements();) {
      String headerName = (String) e.nextElement();
      response.addHeader(headerName, fc.getInitParameter(headerName));
    }
    chain.doFilter(req, response);
  }

  public void init(FilterConfig filterConfig) {
    this.fc = filterConfig;
  }

  public void destroy() {
    this.fc = null;
  }

}

以上這篇JSP過濾器Filter配置過濾類型全部匯總就是小編分享給大家的全部內容了，希望能給大家一個參考，也希望大家多多支持腳本之家。

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