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1 LoginFilter.java 3 代码如下: 4 public class LoginFilter implements Filter { 5 private String permitUrls[] = null; 6 7 private String gotoUrl = null; 8 9 public void destroy() { 10 11 // TODO Auto-generated method stub 12 13 permitUrls = null; 14 15 gotoUrl = null; 16 17 } 18 19 public void doFilter(ServletRequest request, ServletResponse response, 20 21 FilterChain chain) throws IOException, ServletException { 22 23 // TODO Auto-generated method stub 24 25 HttpServletRequest res=(HttpServletRequest) request; 26 27 HttpServletResponse resp=(HttpServletResponse)response; 28 29 if(!isPermitUrl(request)){ 30 31 if(filterCurrUrl(request)){ 32 33 System.out.println("--->请登录"); 34 35 resp.sendRedirect(res.getContextPath()+gotoUrl); 36 37 return; 38 39 } 40 41 } 42 43 System.out.println("--->允许访问"); 44 45 chain.doFilter(request, response); 46 47 } 48 49 public boolean filterCurrUrl(ServletRequest request){ 50 51 boolean filter=false; 52 53 HttpServletRequest res=(HttpServletRequest) request; 54 55 User user =(User) res.getSession().getAttribute("user"); 56 57 if(null==user) 58 59 filter=true; 60 61 return filter; 62 } 63 64 public boolean isPermitUrl(ServletRequest request) { 65 66 boolean isPermit = false; 67 68 String currentUrl = currentUrl(request); 69 70 if (permitUrls != null && permitUrls.length > 0) { 71 72 for (int i = 0; i < permitUrls.length; i++) { 73 74 if (permitUrls[i].equals(currentUrl)) { 75 76 isPermit = true; 77 78 break; 79 80 } 81 82 } 83 84 } 85 86 return isPermit; 87 88 } 89 90 //请求地址 91 92 public String currentUrl(ServletRequest request) { 93 94 HttpServletRequest res = (HttpServletRequest) request; 95 96 String task = request.getParameter("task"); 97 98 String path = res.getContextPath(); 99 100 String uri = res.getRequestURI(); 101 102 if (task != null) {// uri格式 xx/ser 103 104 uri = uri.substring(path.length(), uri.length()) + "?" + "task=" 105 106 + task; 107 108 } else { 109 110 uri = uri.substring(path.length(), uri.length()); 111 112 } 113 114 System.out.println("当前请求地址:" + uri); 115 116 return uri; 117 118 } 119 120 public void init(FilterConfig filterConfig) throws ServletException { 121 122 // TODO Auto-generated method stub 123 124 String permitUrls = filterConfig.getInitParameter("permitUrls"); 125 126 String gotoUrl = filterConfig.getInitParameter("gotoUrl"); 127 128 129 130 this.gotoUrl = gotoUrl; 131 132 133 134 if (permitUrls != null && permitUrls.length() > 0) { 135 136 this.permitUrls = permitUrls.split(","); 137 138 } 139 140 } 141 142 } 143 144 Web.xml 145 146 代码如下: 147 <filter> 148 <filter-name>loginFilter</filter-name> 149 150 <filter-class>filter.LoginFilter</filter-class> 151 152 153 154 <init-param> 155 156 <param-name>ignore</param-name> 157 158 <param-value>false</param-value> 159 160 </init-param> 161 162 <init-param> 163 164 <param-name>permitUrls</param-name> 165 166 <param-value>/,/servlet/Loginservlet?task=login,/public.jsp,/login.jsp</param-value> 167 168 </init-param> 169 170 <init-param> 171 172 <param-name>gotoUrl</param-name> 173 174 <param-value>/login.jsp</param-value> 175 176 </init-param> 177 178 </filter> 179 180 <filter-mapping> 181 182 <filter-name>loginFilter</filter-name> 183 184 <url-pattern>/*</url-pattern> 185 186 </filter-mapping>
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