软件是对质量的不懈追求

2010年6月25日 #

linux du 查看文件夹占用空间


du -sh *

posted @ 2011-04-15 08:39 BlakeSu 阅读(271) | 评论 (0)编辑 收藏

Building Standalone Application with Maven2

If you are building standalone application in Java, Maven is your friend when packing your application,
There are two way to let Maven package your application, either as a single jar with all your dependencies jar.


 <plugin>
  <groupId>org.apache.maven.plugins</groupId>
  <artifactId>maven-assembly-plugin</artifactId>
  <configuration>
   <descriptorRefs>
    <descriptorRef>jar-with-dependencies</descriptorRef>
   </descriptorRefs>
  </configuration>
 </plugin>



One advantage if you choose to do this way is if you need to sign your application jar.
This is needed if you are building a Java Web Start client and you need more access than connecting back to the server.
To read more about have Maven signing your jar read http://maven.apache.org/plugins/maven-jar-plugin/usage.html.
But if you choose to go this way, make sure that all license agreement are shipped with your one single jar.

Another way is to let Maven package your source code only and then referring the dependent jar file from the MANIFEST file.


 <plugin>
  <groupId>org.apache.maven.plugins</groupId>
  <artifactId>maven-jar-plugin</artifactId>
  <configuration>
   <archive>
    <manifest>
     <addClasspath>true</addClasspath>
     <mainClass>se.msc.adapter.Main</mainClass>
     <classpathPrefix>lib/</classpathPrefix>
    </manifest>
   </archive>
  </configuration>
 </plugin>

posted @ 2011-02-24 13:03 BlakeSu 阅读(310) | 评论 (0)编辑 收藏

eclipse 终于有了列编辑功能

eclipse 3.5之后终于有了列编辑,快捷键是alt+shift+a,再次按此快捷键返回常规编辑状态。


posted @ 2010-10-15 11:33 BlakeSu 阅读(1468) | 评论 (0)编辑 收藏

LineNumberReader 指定文件编码


import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.LineNumberReader;


public class Main {
    
    
public static void main(String[] args) throws IOException {

        InputStreamReader isr 
= new InputStreamReader(new FileInputStream("15370720.pdf4"), "utf-16");
        LineNumberReader lnr
=new LineNumberReader(isr);
        String line 
= null;
        
while((line=lnr.readLine())!=null){  
           System.out.println(lnr.getLineNumber()
+"\t"+line);
        }
   }
}

posted @ 2010-08-05 09:13 BlakeSu 阅读(1026) | 评论 (0)编辑 收藏

Class.getResourceAsStream 和 ClassLoader.getResourceAsStream

两个方法的区别是资源的定义不同, 一个主要用于相对与一个object取资源,而另一个用于取相对于classpath的
资源,用的是绝对路径。

在使用Class.getResourceAsStream 时, 资源路径有两种方式, 一种以 / 开头,则这样的路径是指定绝对
路径, 如果不以 / 开头, 则路径是相对与这个class所在的包的。

在使用ClassLoader.getResourceAsStream时, 路径直接使用相对于classpath的绝对路径。

举例,下面的三个语句,实际结果是一样的:
   com.explorers.Test.class.getResourceAsStream("abc.jpg")
= com.explorers.Test.class.getResourceAsStream("/com/explorers/abc.jpg")
= ClassLoader.getResourceAsStream("com/explorers/abc.jpg")

posted @ 2010-07-28 16:31 BlakeSu 阅读(280) | 评论 (0)编辑 收藏

Standalone Java CAS Client

There's a variety of clients for CAS. The Java-based clients (JA-SIG, Yale, see JA-SIG website) typically handle the browser-based client interaction with CAS very well through ServletFilter implementations.

Now what about programmatic authentication, i.e. achieving authentication through non-browser based applications? There exists a CAS .NET client but I did not manage to find the appropriate Java implementation. So here goes - it is based on the Apache HttpClient.

In case I missed any existing implementation achieving the same purpose, let's look at the bright side: at least now I understand the CAS protocol :-)

My CAS client works within any application. It uses the HttpClient and behaves like a browser client as CAS requires cookie support.

Here's the code:
import org.apache.commons.httpclient.Header;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpMethod;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.methods.PostMethod;
import org.apache.log4j.Logger;

/**
* The CasClient allows users to programmatically login
* to CAS protected services based on the CAS 2 protocol.
* This client behaves like a browser-client in terms of
* cookie handling.<br>
*
@author Mathias Richter
*/
public class CasClient
{
  
   
public static Logger LOG = Logger.getLogger( CasClient.class  );

   
public static final String LOGIN_URL_PART = "login";
   
public static final String SERVICE_VALIDATE_URL_PART = "serviceValidate";
   
public static final String TICKET_BEGIN = "ticket=";
   
private static final String LT_BEGIN = "name="lt" value="";
   public static final String CAS_USER_BEGIN = "<cas:user>";
   
public static final String CAS_USER_END = "</cas:user>";
  
   
private HttpClient fClient;
   
private String fCasUrl;
  
   
/**
    * Construct a new CasClient.
    *
    * 
@param casUrl The base URL of the CAS service to be used.
    
*/
   
public CasClient( String casBaseUrl )
   {
       
thisnew HttpClient(), casBaseUrl );
   }
  
   
/**
    * Construct a new CasClient which uses the specified HttpClient
    * for its HTTP calls.
    *
    * 
@param client
    * 
@param casBaseUrl
    
*/
   
public CasClient( HttpClient client, String casBaseUrl )
   {
       fClient 
= client;
       fCasUrl 
= casBaseUrl;
   }
  
   
/**
    * Authenticate the specified username with the specified password.
    * This will not yield any ticket, as no service is authenticated
    * against. This wil just set the CAS cookie in this client upon
    * successful authentication.
    *
    * 
@param username
    * 
@param password
    
*/
   
public void authenticate( String username, String password )
   {
       authenticate( 
null, username, password );
   }
  
   
/**
    * Validate the specified service ticket against the specified service.
    * If the ticket is valid, this will yield the clear text user name
    * of the autenticated user.<br>
    * Note that each service ticket issued by CAS can be used exactly once
    * to validate.
    *
    * 
@param serviceUrl
    * 
@param serviceTicket
    *
    * 
@return Clear text username of the authenticated user.
    
*/
   
public String validate( String serviceUrl, String serviceTicket )
   {
       String result 
= null;
       PostMethod method 
= new PostMethod( fCasUrl + SERVICE_VALIDATE_URL_PART );
       method.setParameter( 
"service", serviceUrl );
       method.setParameter( 
"ticket", serviceTicket );
       
try
       {
           
int statusCode = fClient.executeMethod(method);
           
if (statusCode != HttpStatus.SC_OK)
           {
               LOG.error( 
"Could not validate: " + method.getStatusLine() );
               method.releaseConnection();
           } 
else
           {   
               result 
= extractUser( new String( method.getResponseBody() ) );
           }
       } 
catch ( Exception x )
       {
           LOG.error( 
"Could not validate: " + x.toString () );
           x.printStackTrace();
       }
       method.releaseConnection();
       
return result;
   }
  
   
/**
    * Authenticate the specified user with the specified password against the
    * specified service.
    *
    * 
@param serviceUrl May be null. If a url is specified, the authentication will happen against this service, yielding a service ticket which can be validated.
    * 
@param username
    * 
@param password
    * 
@return A valid service ticket, if and only if the specified service URL is not null.
    
*/
   
public String authenticate( String serviceUrl, String username, String password )
   {
       String lt 
= getLt( serviceUrl );
       
if ( lt == null )
       {
           LOG.error( 
"Cannot retrieve LT from CAS. Aborting authentication for '" + username + "'" );
           
return null;
       }
       String result 
= null;
       PostMethod method 
= new PostMethod( fCasUrl + LOGIN_URL_PART );
       
if ( serviceUrl != null ) // optional
           method.setParameter( "service", serviceUrl );
       method.setParameter( 
"_eventId""submit" );
       method.setParameter(
"username", username );
       method.setParameter(
"password", password );
       method.setParameter(
"lt", lt );
       method.setParameter( 
"gateway""true" );
       
try
       {
           fClient.executeMethod(method);
           
if ( serviceUrl == null )
           {
               
if ( extractLt( new String( method.getResponseBody() ) ) != null ) // if CAS does not return a login page with an LT authentication was successful
               {
                   LOG.error( 
"Authentication for '" +  username + "' unsuccessful" );
                   
if ( LOG.isDebugEnabled() )
                       LOG.debug( 
"Authentication for '" + username + "' unsuccessful." );
               } 
else
               {
                   
if ( LOG.isDebugEnabled() )
                       LOG.debug( 
"Authentication for '" + username + "' unsuccessful." );
               }
           } 
else
           {
               Header h 
= method.getResponseHeader( "Location" );
               
if ( h != null )
                   result 
= extractServiceTicket( h.getValue() );
               
if ( result == null )
                   LOG.error( 
"Authentication for '" + username + "' unsuccessful." );
           }
       } 
catch ( Exception x )
       {
           LOG.error( 
"Could not authenticate'" + username + "':" + x.toString () );
       }
       method.releaseConnection();
       
return result;
   }
  
   
/**
    * Helper method to extract the user name from a "service validate" call to CAS.
    *
    * 
@param data Response data.
    * 
@return The clear text username, if it could be extracted, null otherwise.
    
*/
   
protected String extractUser( String data )
   {
       String user 
= null;
       
int start = data.indexOf( CAS_USER_BEGIN  );
       
if ( start >= 0 )
       {
           start 
+= CAS_USER_BEGIN.length();
           
int end = data.indexOf( CAS_USER_END );
           
if ( end > start )
               user 
= data.substring( start, end );
           
else
               LOG.warn( 
"Could not extract username from CAS validation response. Raw data is: '" + data + "'" );
       } 
else
       {
           LOG.warn( 
"Could not extract username from CAS validation response. Raw data is: '" + data + "'" );
       }
       
return user;
   }
  
   
/**
    * Helper method to extract the service ticket from a login call to CAS.
    *
    * 
@param data Response data.
    * 
@return The service ticket, if it could be extracted, null otherwise.
    
*/
   
protected String extractServiceTicket( String data )
   {
       String serviceTicket 
= null;
       
int start = data.indexOf( TICKET_BEGIN  );
       
if ( start > 0 )
       {
           start 
+= TICKET_BEGIN.length();
           serviceTicket 
= data.substring( start );
       }
       
return serviceTicket;
   }
  
   
/**
    * Helper method to extract the LT from a login form from CAS.
    *
    * 
@param data Response data.
    * 
@return The LT, if it could be extracted, null otherwise.
    
*/
   
protected String extractLt( String data )
   {
       String token 
= null;
       
int start = data.indexOf( LT_BEGIN  );
       
if ( start < 0 )
       {
           LOG.error( 
"Could not obtain LT token from CAS: LT Token not found in response." );
       } 
else
       {
           start 
+= LT_BEGIN.length();
           
int end = data.indexOf( """, start );
           token = data.substring( start, end );
       }       
       
return token;
   }
  
   
/**
    * This method requests the original login form from CAS.
    * This form contains an LT, an initial token that must be
    * presented to CAS upon sending it an authentication request
    * with credentials.<br>
    * If a service URL is provided (which is optional), this method
    * will post the URL such that CAS authenticates against the
    * specified service when a subsequent authentication request is
    * sent.
    *
    * 
@param serviceUrl
    * 
@return The LT token if it could be extracted from the CAS response.
    
*/
   
protected String getLt( String serviceUrl )
   {
       String lt 
= null;
       HttpMethod method 
= null;
       
if ( serviceUrl == null )
           method 
= new GetMethod( fCasUrl + LOGIN_URL_PART );
       
else
       {
           method 
= new PostMethod( fCasUrl + LOGIN_URL_PART );
           ( ( PostMethod ) method ).setParameter( 
"service", serviceUrl );
       }
       
try
       {
           
int statusCode = fClient.executeMethod(method);
           
if (statusCode != HttpStatus.SC_OK)
           {
               LOG.error( 
"Could not obtain LT token from CAS: " + method.getStatusLine() );
               method.releaseConnection();
           } 
else
           {
               Object o 
= method.getResponseHeaders() ;
               
return extractLt( new String( method.getResponseBody() ) );
           }
       } 
catch ( Exception x )
       {
           LOG.error( 
"Could not obtain LT token from CAS: " + x.toString () );
       }
       method.releaseConnection();
       
return lt;
   }
  
}

posted @ 2010-07-15 17:59 BlakeSu 阅读(403) | 评论 (0)编辑 收藏

java取文件换行符

System.getProperty("line.separator")

posted @ 2010-06-30 15:45 BlakeSu 阅读(302) | 评论 (0)编辑 收藏

禁止浏览器缓存

html
  <meta http-equiv="pragma" content="no-cache">
  
<meta http-equiv="cache-control" content="no-cache">
  
<meta http-equiv="expires" content="0">


servlet
          response.setHeader("pragma","no-cache");
          response.setHeader(
"cache-control","no-cache");
          response.setDateHeader(
"expires"0);


posted @ 2010-06-25 09:06 BlakeSu 阅读(243) | 评论 (0)编辑 收藏

frame 中跨域访问cookie(java)

response.addHeader("P3P","CP=CAO PSA OUR");

posted @ 2010-06-25 09:04 BlakeSu 阅读(402) | 评论 (0)编辑 收藏