Java Utilities

AmpersandInXmlTest-context.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">
	<bean id="name1" class="java.lang.String">
		<constructor-arg value="tcp://test?foo=bar&amp;foo2=bar2"/>
	</bean>
	<bean id="name2" class="java.lang.String">
		<constructor-arg><value>tcp://test?foo=bar&amp;foo2=bar2</value></constructor-arg>
	</bean>
	<bean id="name3" class="java.lang.String">
		<constructor-arg><value><![CDATA[tcp://test?foo=bar&foo2=bar2]]></value></constructor-arg>
	</bean>
</beans>

AmpersandInXmlTest.java

package atest;

import javax.annotation.Resource;

import org.hamcrest.Matchers;
import org.junit.Assert;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration
public class AmpersandInXmlTest {
    @Resource(name="name1")
    String name1;
    @Resource(name="name2")
    String name2;
    @Resource(name="name3")
    String name3;
    
    @Test
    public void testAmpersand() throws Exception {
        Assert.assertThat(name1, Matchers.is("tcp://test?foo=bar&foo2=bar2"));
        Assert.assertThat(name2, Matchers.is("tcp://test?foo=bar&foo2=bar2"));
        Assert.assertThat(name3, Matchers.is("tcp://test?foo=bar&foo2=bar2"));
    }
}

ClasspathURLStreamHandler.java

/**
 * A handler to use 'classpath:' in java.net.URL class.
 *
 * <p>Usage: <code>
 * URL url = new URL(null, "classpath:atest/config.properties", new ClasspathURLStreamHandler());
 * </code>
 */
public class ClasspathURLStreamHandler extends URLStreamHandler {
        @Override
        protected URLConnection openConnection(URL url) throws IOException {
                String protocol = url.getProtocol();
                if ("classpath".equals(protocol)) {
                        URL resUrl = getClassLoader().getResource(url.getPath());
                        return resUrl.openConnection();
                } else {
                        // Use default JDK url impl.
                        return url.openConnection();
                }
        }

        protected ClassLoader getClassLoader() {
                return Thread.currentThread().getContextClassLoader();
        }
}

FlashScopeFilter.java

//
// http://blog.smartkey.co.uk/2011/01/implementing-flash-scope-in-java-web-applications/
//

import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import java.io.IOException;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;

/**
 * Ensures that any request parameters whose names start
 * with 'flash.' are available for the next request too.
 */
public class FlashScopeFilter implements Filter {

    private static final String FLASH_SESSION_KEY = "FLASH_SESSION_KEY";

    @SuppressWarnings("unchecked")
    public void doFilter(ServletRequest request, ServletResponse response,
					FilterChain chain) throws IOException, ServletException {

        //reinstate any flash scoped params from the users session
		//and clear the session
        if (request instanceof HttpServletRequest) {
            HttpServletRequest httpRequest = (HttpServletRequest) request;
            HttpSession session = httpRequest.getSession(false);
            if (session != null) {
                Map<String, Object> flashParams = (Map<String, Object>)
									session.getAttribute(FLASH_SESSION_KEY);
                if (flashParams != null) {
                    for (Map.Entry<String, Object> flashEntry : flashParams.entrySet()) {
                        request.setAttribute(flashEntry.getKey(), flashEntry.getValue());
                    }
                    session.removeAttribute(FLASH_SESSION_KEY);
                }
            }
        }

        //process the chain
        chain.doFilter(request, response);

        //store any flash scoped params in the user's session for the
		//next request
        if (request instanceof HttpServletRequest) {
            HttpServletRequest httpRequest = (HttpServletRequest) request;
            Map<String, Object> flashParams = new HashMap();
			Enumeration e = httpRequest.getAttributeNames();
            while (e.hasMoreElements()) {
                String paramName = (String) e.nextElement();
                if (paramName.startsWith("flash.")) {
                    Object value = request.getAttribute(paramName);
                    paramName = paramName.substring(6, paramName.length());
                    flashParams.put(paramName, value);
                }
            }
            if (flashParams.size() > 0) {
                HttpSession session = httpRequest.getSession(false);
                session.setAttribute(FLASH_SESSION_KEY, flashParams);
            }
        }
    }

    public void init(FilterConfig filterConfig) throws ServletException {
        //no-op
    }

    public void destroy() {
        //no-op
    }
}

JavaDocCodeFormatDemo.java

/**
 * This is a POJO to be use in Spring config like this:
 * <pre>{@code
 * <bean id="myBean" class="MyBean">
 *     <property name="name" value="foo"/>
 * </bean>
 * }</pre>
 */
public class JavaDocCodeFormatDemo{
  private String name;
  public void setName(String name) { this.name = name; }
}

web-app.xml

<?xml version="1.0"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" 
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

	<description>My Webapp</description>
	
	<!-- Servlet Mappings -->
	<servlet>
		<servlet-name>HealthServlet</servlet-name>
		<servlet-class>deng.mywebapp.HealthServlet</servlet-class>
	</servlet>
	<servlet-mapping>
		<servlet-name>HealthServlet</servlet-name>
		<url-pattern>/health</url-pattern>
	</servlet-mapping>
	
	
</web-app>

# For web-app 3.0
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee" 
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
    version="3.0">

	<description>My Webapp</description>
	
	<!-- Servlet Mappings -->
	<servlet>
		<servlet-name>HealthServlet</servlet-name>
		<servlet-class>deng.mywebapp.HealthServlet</servlet-class>
	</servlet>
	<servlet-mapping>
		<servlet-name>HealthServlet</servlet-name>
		<url-pattern>/health</url-pattern>
	</servlet-mapping>
	
	
</web-app>