全域編碼過濾器

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import java.io.IOException;import java.io.UnsupportedEncodingException; import javax.servlet.Filter;import javax.servlet.FilterChain;import javax.servlet.FilterConfig;import javax.servlet.ServletException;import javax.servlet.ServletRequest;import javax.servlet.ServletResponse;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletRequestWrapper;import javax.servlet.http.HttpServletResponse; public class EncodingFilter implements Filter {         private static String encoding;    private static final String DEFAULT_CHARSET="UTF-8";    @Override    public void destroy() {        System.out.println("--------destroy---------");    }     @Override    public void doFilter(ServletRequest request, ServletResponse response,            FilterChain chain) throws IOException, ServletException {        System.out.println("--------doFilter---------");        HttpServletRequest httpRequest = (HttpServletRequest) request;          HttpServletResponse httpResponse=(HttpServletResponse)response;        if("GET".equals(httpRequest.getMethod())){            EncodingHttpServletRequest wrapper = new EncodingHttpServletRequest(httpRequest, encoding);               chain.doFilter(wrapper, response);          }else{            httpRequest.setCharacterEncoding(encoding);            httpResponse.setContentType("text/html;charset="+encoding);            chain.doFilter(request, response);          }    }    private static class  EncodingHttpServletRequest extends HttpServletRequestWrapper{         private HttpServletRequest request;         public EncodingHttpServletRequest(HttpServletRequest request,String encoding) {           super(request);           this.request = request;         }         @Override        public String getParameter(String name) {               String value = request.getParameter(name);               try {                value = new String(value.getBytes("iso8859-1"), encoding);               } catch (UnsupportedEncodingException e) {                e.printStackTrace();               }               return super.getParameter(name);        }    }    @Override    public void init(FilterConfig config) throws ServletException {         System.out.println("--------init---------");           encoding = config.getInitParameter("encoding");         if(encoding==null||"".equals(encoding))             encoding=DEFAULT_CHARSET;    } }

<!-- 設定全域的編碼格式，針對get，post請求，預設編碼為UTF-8 -->  <filter>      <filter-name>characterFilter</filter-name>      <filter-class>com.mscncn.jsd1404.EncodingFilter</filter-class>      <init-param>          <param-name>encoding</param-name>          <param-value>UTF-8</param-value>      </init-param>  </filter>  <filter-mapping>      <filter-name>characterFilter</filter-name>      <!-- 攔截所有的請求,為所有的請求設定編碼 -->      <url-pattern>/*</url-pattern>  </filter-mapping>

 

全域編碼過濾器