修改cas-server(三)，自定义登录验证方式。

在修改cas-server（二）中，虽然修改了jdbc，但是还是只能判断用户名/密码。

如果需要多增加一个参数，如systemid，则需要修改cas-server-core.jar的源码。

参考：http://blog.csdn.net/lovesummerforever/article/details/38023385

1.修改login-webflow.xml

2.修改casLoginView.jsp

增加系统id

系统id:

3.修改cas-server-core.jar的源代码。

修改UsernamePasswordCredentials.java

/* 
 * Copyright 2007 The JA-SIG Collaborative. All rights reserved. See license 
 * distributed with this file and available online at 
 * http://www.ja-sig.org/products/cas/overview/license/ 
 */  
package org.jasig.cas.authentication.principal;  
  
import javax.validation.constraints.NotNull;  
import javax.validation.constraints.Size;  
  
/** 
 * UsernamePasswordCredentials respresents the username and password that a user 
 * may provide in order to prove the authenticity of who they say they are. 
 *  
 * @author Scott Battaglia 
 * @version $Revision: 1.2 $ $Date: 2007/01/22 20:35:26 $ 
 * @since 3.0 
 * 
 
 * This is a published and supported CAS Server 3 API. 
 * 
 
 */  
public class UsernamePasswordCredentials implements Credentials {  
  
    /** Unique ID for serialization. */  
    private static final long serialVersionUID = -8343864967200862794L;  
  
    /** The username. */  
    @NotNull  
    @Size(min=1,message = "required.username")  
    private String username;  
  
    /** The password. */  
    @NotNull  
    @Size(min=1, message = "required.password")  
    private String password;  
  
    /** The systemId for xxx2.0 for sql validate xx add 2014��7��21��16:12:51. */  
    @NotNull  
    @Size(min=1, message = "required.systemId")  
    private String systemId;  
    /*systemId  begin*/  
  
    /** 
     * @return Returns the systemId. 
     */  
     
    public String getSystemId() {  
        return systemId;  
    }  
  
    public void setSystemId(String systemId) {  
        this.systemId = systemId;  
    }  
  
     public String toStringSystemId() {  
        return "[systemId: " + this.systemId + "]";  
    }  
  
    /*end */  
  
  
    /** 
     * @return Returns the password. 
     */  
    public final String getPassword() {  
        return this.password;  
    }  
  
    /** 
     * @param password The password to set. 
     */  
    public final void setPassword(final String password) {  
        this.password = password;  
    }  
  
    /** 
     * @return Returns the userName. 
     */  
    public final String getUsername() {  
        return this.username;  
    }  
  
    /** 
     * @param userName The userName to set. 
     */  
    public final void setUsername(final String userName) {  
        this.username = userName;  
    }  
  
    public String toString() {  
        return "[username: " + this.username + "]";  
    }  
  
    @Override  
    public boolean equals(final Object o) {  
        if (this == o) return true;  
        if (o == null || getClass() != o.getClass()) return false;  
  
        UsernamePasswordCredentials that = (UsernamePasswordCredentials) o;  
  
        if (password != null ? !password.equals(that.password) : that.password != null) return false;  
        if (username != null ? !username.equals(that.username) : that.username != null) return false;  
  
        return true;  
    }  
  
    @Override  
    public int hashCode() {  
        int result = username != null ? username.hashCode() : 0;  
        result = 31 * result + (password != null ? password.hashCode() : 0);  
        return result;  
    }  
}  

4.修改上一篇文章的RsCasDaoAuthenticationHandler.java

package org.jasig.cas.authentication.handler;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import javax.sql.DataSource;

import org.jasig.cas.authentication.handler.support.AbstractUsernamePasswordAuthenticationHandler;
import org.jasig.cas.authentication.handler.util.Crypt;
import org.jasig.cas.authentication.principal.UsernamePasswordCredentials;

/**
 * ClassName:RsCasDaoAuthenticationHandler 

 * Function: TODO ADD FUNCTION. 

 * Reason: TODO ADD REASON. 

 * Date: 2013-4-25 下午04:20:35 

 * 
 * @author Administrator
 * @version
 * @since JDK 1.5
 * @see
 */
public final class RsCasDaoAuthenticationHandler extends
		AbstractUsernamePasswordAuthenticationHandler
{
	
	private DataSource dataSource;
	// 构造方法
	public RsCasDaoAuthenticationHandler()
	{

	}

	@Override
	protected boolean authenticateUsernamePasswordInternal(
			UsernamePasswordCredentials credentials) throws AuthenticationException
	{

		// 标志位
		Boolean bool = false;

		String username = credentials.getUsername();
		String password = credentials.getPassword();
		String systemid = credentials.getSystemId();

		// 取得MD5加密后的字符串
		password = new Crypt().encode(password);

		System.out.println("开始CAS认证方式 RsCasDaoAuthenticationHandler......");
		System.out.println("userName:" + username);
		System.out.println("password:" + password);

		// 连接数据库
		Connection conn = null;
		PreparedStatement ps = null;
		ResultSet rs = null;
		
		String user = "root";
		String pwd = "123456";
		String url = "jdbc:mysql://localhost:3306/frj-cas?useUnicode=true&characterEncoding=UTF-8";
		try
		{
			try
			{
				Class.forName("com.mysql.jdbc.Driver");
			}
			catch(ClassNotFoundException e)
			{
				e.printStackTrace();
			}
			conn = dataSource.getConnection();
			//conn = DriverManager.getConnection(url, user, pwd);
			String sql = "select count(*)  from user2 where  username='"
					+ username + "' and password='" + password + "' and systemid='"+systemid;
			ps = conn.prepareStatement(sql);
			rs = ps.executeQuery();
			if (rs != null && rs.next())
			{
				int i = rs.getInt(1);
				if (i > 0)
				{
					// 只要有对应的一条记录通过，就返回true
					bool = true;
				}
			}

		}
		catch(SQLException sql)
		{
			sql.printStackTrace();
		}
		finally
		{
			try
			{
				if (rs != null)
				{
					rs.close();
				}

				if (ps != null)
				{
					ps.close();
				}

				if (conn != null)
				{
					conn.close();
				}
			}
			catch(SQLException e)
			{
				e.printStackTrace();
			}
		}

		return bool;
	}

	public DataSource getDataSource()
	{
		return dataSource;
	}

	public void setDataSource(DataSource dataSource)
	{
		this.dataSource = dataSource;
	}

}