Step1:自定义封装request

package com.tsou.comm.servlet;import java.util.Enumeration;import java.util.Map;import java.util.Vector;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletRequestWrapper;/** * * 
    
      * 功能：封装的请求处理特殊字符 * 
     
 * @ClassName: TsRequest * @version V1.0  * @date 2014年9月25日 * @author wangsheng */public class TsRequest extends HttpServletRequestWrapper {           private Map params;           public TsRequest(HttpServletRequest request, Map newParams) {                    super(request);                    this.params = newParams;          }           public Map getParameterMap() {                    return params ;          }           public Enumeration getParameterNames() {                    Vector l = new Vector( params.keySet());                    return l.elements();          }           public String[] getParameterValues(String name) {                   Object v = params.get(name);                    if (v == null ) {                              return null ;                   } else if (v instanceof String[]) {                             String[] value = (String[]) v;                              for (int i = 0; i < value.length; i++) {                                      value[i] = value[i].replaceAll( "<", "<" );                                      value[i] = value[i].replaceAll( ">", ">" );                             }                              return (String[]) value;                   } else if (v instanceof String) {                             String value = (String) v;                             value = value.replaceAll( "<", "<" );                             value = value.replaceAll( ">", ">" );                              return new String[] { (String) value };                   } else {                              return new String[] { v.toString() };                   }          }           public String getParameter(String name) {                   Object v = params.get(name);                    if (v == null ) {                              return null ;                   } else if (v instanceof String[]) {                             String[] strArr = (String[]) v;                              if (strArr.length > 0) {                                      String value = strArr[0];                                      value = value.replaceAll( "<", "<" );                                      value = value.replaceAll( "<", ">" );                                       return value;                             } else {                                       return null ;                             }                   } else if (v instanceof String) {                             String value = (String) v;                             value = value.replaceAll( "<", "<" );                             value = value.replaceAll( ">", ">" );                              return (String) value;                   } else {                              return v.toString();                   }          }}
    

Step2:设置过滤器

package com.tsou.comm.filter;import java.io.IOException;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 com.tsou.comm.servlet.TsRequest;/** * * 
    
      * 功能：特殊字符过滤器 * 
     
 * @ClassName: CharacterFilter * @version V1.0  * @date 2014年9月25日 * @author wangsheng */public class CharacterFilter implements Filter{           @Override           public void destroy() {          }           @Override           public void doFilter(ServletRequest req, ServletResponse res,                             FilterChain chain) throws IOException, ServletException {                   HttpServletRequest request = (HttpServletRequest)req;                   TsRequest wrapRequest= new TsRequest(request,request.getParameterMap());                   chain.doFilter(wrapRequest, res);          }           @Override           public void init(FilterConfig arg0) throws ServletException {          }}
    

Step3:拦截URL

           
    
                         
     
       characterFilter                     
      
        com.tsou.comm.filter.CharacterFilter           
      
     
               
    
                         
     
       characterFilter                    
      
        /*
                  
      
     
    

Step4:查看效果