由于项目需要,需要内外网都能同时访问，原本的不能符合要求，只能着手修改，以下是 修改步骤。我用的是cas-client-core-3.3.3.jar的客户端版本
1.获得cas-client-core-3.3.3.jar的源码。
2.新增工具类CustomConfigUtil,我把工具类放在org.jasig.cas.client.util下。
package org.jasig.cas.client.util;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
public class CustomConfigUtil {
/**
* @Description 获取属性文件中的属性信息
* @return
*/
public static Map<String, String> getCustomConfig(
final ServletContext servletContext,
final HttpServletRequest request) {
Map<String, String> map = new HashMap<String, String>();
Map<String, String> map2 = HttpConnectionUtil.getServiceUrlMap();
//读取配置文件
Map<String, String> segmentMap = PropertiesUtil.readProperties(CustomConfigUtil.class.getResource("/").getPath() + "segment.properties");
boolean falg = false;
for (String key : segmentMap.keySet()) {
//判断是否属于某个网段
falg = HttpConnectionUtil.ipIsValid(segmentMap.get(key), request.getRemoteAddr());
if(falg){
break;
}
}
// 判断请求是从外网访问还是从内网访问
if (falg) {
//client客户端地址
map.put("client", map2.get("cas.inClient"));
//cas服务器地址
map.put("casServerTicketUrl", map2.get("cas.inCasServer"));
//cas服务器地址
map.put("casServerTicket", map2.get("cas.inCasServerTicket"));
} else {
//client客户端地址
map.put("client", map2.get("cas.outClient"));
//cas服务器地址
map.put("casServerTicketUrl", map2.get("cas.outCasServer"));
//cas服务器地址
boolean flag = HttpConnectionUtil.isConnection(map2.get("cas.outCasServerTicket"));
if(flag){
map.put("casServerTicket", map2.get("cas.outCasServerTicket"));
}else{
map.put("casServerTicket", map2.get("cas.inCasServerTicket"));
}
}
return map;
}
}
3.新增工具类HttpConnectionUtil 代码如下
package org.jasig.cas.client.util;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Map;
public class HttpConnectionUtil {
/**
* 测试网络是否能连接通畅
*
* @param serviceURL
* @return
*/
public static boolean isConnection(String serviceURL) {
try {
URL url = new URL(serviceURL);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setConnectTimeout(2000);// 2秒则超时
conn.setReadTimeout(2000);
int state = conn.getResponseCode();
if (state == 200) {
return true;
}
} catch (Exception e) {
return false;
}
return false;
}
public static boolean ipIsValid(String ipSection, String ip) {
if (ipSection == null)
throw new NullPointerException("IP段不能为空！");
if (ip == null)
throw new NullPointerException("IP不能为空！");
ipSection = ipSection.trim();
ip = ip.trim();
final String REGX_IP = "((25[0-5]|2[0-4]\\d|1\\d{2}|[1-9]\\d|\\d)\\.){3}(25[0-5]|2[0-4]\\d|1\\d{2}|[1-9]\\d|\\d)";
final String REGX_IPB = REGX_IP + "\\-" + REGX_IP;
if (!ipSection.matches(REGX_IPB) || !ip.matches(REGX_IP))
return false;
int idx = ipSection.indexOf('-');
String[] sips = ipSection.substring(0, idx).split("\\.");
String[] sipe = ipSection.substring(idx + 1).split("\\.");
String[] sipt = ip.split("\\.");
long ips = 0L, ipe = 0L, ipt = 0L;
for (int i = 0; i < 4; ++i) {
ips = ips << 8 | Integer.parseInt(sips[i]);
ipe = ipe << 8 | Integer.parseInt(sipe[i]);
ipt = ipt << 8 | Integer.parseInt(sipt[i]);
}
if (ips > ipe) {
long t = ips;
ips = ipe;
ipe = t;
}
return ips <= ipt && ipt <= ipe;
}
public static void main(String[] args) {
if (ipIsValid("127.0.0.1-127.0.0.1", "127.0.0.1")) {
System.out.println("ip属于该网段");
} else{
System.out.println("ip不属于该网段");
}
}
/**
* 获取配置文件信息
*
* @return
*/
public static Map<String, String> getServiceUrlMap() {
return PropertiesUtil.readProperties(HttpConnectionUtil.class
.getResource("/").getPath() + "cas-service.properties");
}
}
4.新增工具类：PropertiesUtil：
package org.jasig.cas.client.util;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;
public class PropertiesUtil {
public static Map<String, String> readProperties(String path) {
Map<String, String> map = new HashMap<String, String>();
try {
Properties props = new Properties();
// System.out.println(path);
props.load(new FileInputStream(path));
Enumeration<?> enum1 = props.propertyNames();
while(enum1.hasMoreElements()) {
String strKey = (String) enum1.nextElement();
String strValue = props.getProperty(strKey);
map.put(strKey, strValue);
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return map;
}
}
5.所属的两个配置文件
cas-service.properties文件：
#cas服务端的内网和外网
cas.inCasServer=http://10.206.20.52:8982/cas
cas.outCasServer=http://218.6.169.98:18982/cas
#客户端的内网和外网
cas.inClient=http://10.206.20.52:8982/tickets
cas.outClient=http://218.6.169.98:18982/tickets
#服务端的内网和外网
cas.inCasServerTicket=http://10.206.20.52:8982/cas
cas.outCasServerTicket=http://218.6.169.98:18982/cas
segment.properties文件：
#网段
segment_1 =10.0.0.0-10.255.255.255
segment_2 =172.16.0.0-172.31.255.255
segment_3 =192.168.0.0-192.168.255.255
segment_4 =172.10.0.0-172.31.255.255
6.做好以上工作开始修改源码,首先修改AuthenticationFilte ,添加静态属性
public static final String CONST_CAS_GATEWAY = "const_cas_gateway";
然后找到方法：doFilter 方法内容修改为：
public final void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)
throws IOException, ServletException
{
HttpServletRequest request = (HttpServletRequest)servletRequest;
HttpServletResponse response = (HttpServletResponse)servletResponse;
HttpSession session = request.getSession(false);
String ticket = request.getParameter(getArtifactParameterName());
Assertion assertion = session != null ?
(Assertion)session.getAttribute("_const_cas_assertion_") : null;
boolean wasGatewayed = (session != null) &&
(session.getAttribute("_const_cas_gateway_") != null);
String isToLogout = request.getParameter("isToLogout");
if ((CommonUtils.isBlank(ticket)) && (assertion == null) && (!wasGatewayed) &&
(!"1".equals(isToLogout)))
{
this.logger.debug("noticket and no assertion found");
if (this.gateway)
{
this.logger.debug("settinggateway attribute in session");
request.getSession(true).setAttribute("_const_cas_gateway_", "yes");
}
//修改部分
String serviceUrl = constructServiceUrl(request, response,
"auth");
Map<String, String> config = CustomConfigUtil.getCustomConfig(
request.getServletContext(), request);
this.casServerLoginUrl = ((String)config.get("casServerTicketUrl")).toString();
setCasServerLoginUrl(((String)config.get("casServerTicketUrl")).toString());
String urlToRedirectTo = CommonUtils.constructRedirectUrl(
this.casServerLoginUrl, getServiceParameterName(),
serviceUrl, this.renew, this.gateway);
if (this.logger.isDebugEnabled()) {
this.logger.debug("redirectingto \"" + urlToRedirectTo + "\"");
}
response.sendRedirect(urlToRedirectTo);
return;
}
if (session != null)
{
this.logger.debug("removinggateway attribute from session");
session.setAttribute("_const_cas_gateway_", null);
}
filterChain.doFilter(request, response);
}
7.修改后constructServiceUrl报错 因为之前该方法只有两个参数 现在修改为3个 找到改方法的类AbstractCasFilter
源码在113行那样constructServiceUrl重载该方法：
protected final String constructServiceUrl(final HttpServletRequest request, final HttpServletResponse response,final String type) {
//从配置文件中取出cas服务器的登陆地址
Map<String,String> config = CustomConfigUtil.getCustomConfig(request.getServletContext(),request);
if("auth".equals(type)){
this.serverName = config.get("client").toString();
this.service = config.get("client").toString();
}else if("validation".equals(type)){
this.serverName = config.get("casServerTicket").toString();
this.service = config.get("client").toString();
}
注意 该方法调用的地方还有几个 需要全部都修改为重载的方法 可以先不忙重载, 先在原方法修改 看到源码报错的地方修改后在做调整，其他地方调整后传人参数为：“validation”
很多地方写的不是很好，配置文件那些有的都直接到里面固定了，有些还需要优化 不过总体来说 是可以实现了内网和外网的通用访问。
具体项目和说明示例可下载：
http://pan.baidu.com/s/1sklXCK1
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