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2011-06-16 14:09:26

•   在web工程中，jsp页面上的请求时要进行字符编码转换的 通常在web。xml中添加过滤器作用是把request对象中的头信息参数等等进行编码转换 然后继续后续过滤链。
  web。xml加入 （尽可能考前排放 过滤器是有顺序的）
  	
  		Set Character Encoding
  		
  			 lter。
    SetCharacterEncodingFilter
  		
  		
  			encoding
  			GB18030
  		
  		
  			ignore
  			true
  		
  	
  	
  		Set Character Encoding
  		/*
  	
  下面要创建这个过滤器 上面配置中有个指定路径下的“ lter。
    SetCharacterEncodingFilter”当然你要换成你的包路径
  //SetCharacterEncodingFilter过滤器java代码：
  package  lter;
  import  rvlet。Filter;
  import  。
    IOException;
  import  rvlet。*;
  /**
   * @author longyue
   *
   * TODO To change the template for this generated type comment go to
   * Window - Preferences - Java - Code Style - Code Templates
   */
  public class SetCharacterEncodingFilter implements Filter {
  	 
  	 /**
  	 * The default character encoding to set for requests that pass through
  	 * this filter。
    
  	 */
  	 protected String encoding = null;
  	 
  	 /**
  	 * The filter configuration object we are associated with。 If this value
  	 * is null, this filter instance is not currently configured。
    
  	 */
  	 protected FilterConfig filterConfig = null;
  	 /**
  	 * Should a character encoding specified by the client be ignored?
  	 */
  	 protected boolean ignore = true;
  	 // --------------------------------------------------------- Public Methods
  	 /**
  	 * Take this filter out of service。
    
  	 */
  	 public void destroy() {
  	     this。encoding = null;
  	      lterConfig = null;
  	 }
  	 public void doFilter(ServletRequest request, ServletResponse response,
  	     FilterChain chain) throws IOException, ServletException {
  	     if (ignore || ( tCharacterEncoding() == null)) {
  	         String encoding = selectEncoding(request);
  	         if (encoding != null) {
  	              tCharacterEncoding(encoding);
  	         }
  	     }
  	     
  	     // Pass control on to the next filter
  	      Filter(request, response);
  	 }
  	 /**
  	 * Place this filter into service。
    
  	 *
  	 * @param filterConfig The filter configuration object
  	 */
  	 public void init(FilterConfig filterConfig) throws ServletException {
  	      lterConfig = filterConfig;
  	     this。
    encoding =  tInitParameter("encoding");
  	     String value =  tInitParameter("ignore");
  	     if (value == null) {
  	         this。
    ignore = true;
  	     } else if (value。equalsIgnoreCase("true")) {
  	         this。ignore = true;
  	     } else if (value。
    equalsIgnoreCase("yes")) {
  	         this。ignore = true;
  	     } else {
  	         this。ignore = false;
  	     }
  	 }
  	 // ------------------------------------------------------ Protected Methods
  	 protected String selectEncoding(ServletRequest request) {
  	     return (this。
    encoding);
  	 }
  }。

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  2011-06-16 14:09:26

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