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CGS 4854 Summer 2012 Web Site Construction and Management Instructor: Francisco R. Ortega Chapter 5

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Todays Lecture Brief review of Log4J Chapter 5 Remember Mid-Term next class

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Mid-Term Mid-Term June 21 st. Chapters 1,2,3 and 4. Possible review for mid-term June 14 (after quiz 4) or June 19 Extra Credit for Mid-Term Extra credit question : Regular Expressions (if covered before the exam) You are allowed to bring two letter size paper to the exam

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ASCII Table (Part 1)

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Regular Expressions Match strings of text (wiki) Sequence of regular expressions is known as a pattern Regular expressions contain Wildcards Special characters Escape sequences

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Regular Expressions 101 Characters match themselves except: [\^$.|?*+() \ suppresses the meaning of special characters [] starts a character class. We match one from the class. - specifies a range of characters ^ negates a character class. matches any single character except line break | matches either the left, or the right (or)

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Character Classes [xyz] : will match x or y or z [a-z] : will match lowercase letters [a-zA-Z] : will match all letters [a-Z] :will not match any letters (why?) [A-z] : will match all letters but additional symbols. Why? [^abc] : Any character except for a,b or c.

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Predefined classes Character classMeaning.Any character except line termination \dA digit: [0-9] \DA non digit [^0-9] \sA whitespace character \SA non-whitespace character \wA word character [a-zA-Z_0-9] \WA non word character

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Escape Sequence \. : would match a period [.] : would match a period \ does not lose special meaning inside square brackets [\d]

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Alternation yes|no yes|no|maybe It will match either yes,no or maybae. But only one of them.

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Grouping and Capturing (pattern) Capturing pattern. Can retrieve values from \1 thru \9 Example Text: abyes3 [a-z] ([a-z]) (yes|no) \d \1 is equal to b \2 is equal to yes (?:pattern) Only used for grouping

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Ignoring case (?i)yes|no [yY] [eE] [sS] | [Nn] [Oo]

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Repetition Repetition SymbolMeaning *Matches zero or more occurrences of the preceding pattern ?Matches zero or one occurrences of the preceding pattern +Matches one or more occurrences of the preceding pattern {m,n}Range of times that the pattern can repeat. ? Same as {0,1} {m}Range of exactly how many times that will match the pattern. {m,}Range of at least times that will match the pattern. + same as {1,}

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Regex in java You will need to use two backslashes Regex: \d Java regex: \\d

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Hibernate (wiki) Mapping from Java classes to database tables Mapping Java data types to SQL data types Data query and retrieval facilities. Generates the SQL calls Required Validation

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Hibernate Required Validation Uses annotations @Pattern(regexp = , message = Some Message) There is a default message Annotations @Pattern @NotNull (do not use with primitives) Annotations to be used with Numbers @Min ( value = 20) @Max (value = 100) @Range(min= 0, max =100) Annotations for Collections will be covered in Ch. 6

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Required Validation @Pattern(regex=".*\\S.*", message="cannot be empty") @NotNull public String getHobby() { return hobby; } If more than one annotation, then is assume that logical operator is AND

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Question.*\S.* In java .*\\S.*

Slide 20 Aversion ${helper.errors.aversion} Aversion ${helper.errors.aversion}

JSP Hobby ${helper.errors.hobby} Aversion ${helper.errors.aversion}

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Min/Max

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Creating Error Messages Class that performs validation is: Validator Only one instance is needed Created from Validator Factory Only one instance is needed

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Creating Error Messages Protected static final ValidatorFactory validatorFactory = Validation.buildDefaultValidatorFactory(); Protected static final Validator validator = validatorFactory.getValidator(); Array of validation is created by calling validators validate method. Set > violations = validator.validate(data);

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Implementing Validation Using the array provided by hibernate Linear Search Using a Map (HashMap) Insert O(1) Get/Set O(1) Contain Key Average O(1 + n/k) worst case is O(n) Where have we seen something similar to the map structure in this class? Request.getSession().setAttribute(helper,this);

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Changes to Helper 1.errorMap 2.setErrors 3.getErrors() 4.clearErrors() All of this can be found in HelperBaseCh5 in the shared folder.

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HelperBaseCh5 HelperBase HttpServletRequest request HttpServletResponse response Logger logger Map errorMap Abstract copyFromSession() addHelperToSession() executeButtonMethod() fillBeanFromRequest() setErrors() getErrors() isValid()

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java.util.Map Example Map myMap = new HashMap " title="Retrieving the Error Messages Hobby ${helper.errors.hobby} ">

Retrieving the Error Messages Hobby ${helper.errors.hobby}

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The Big Picture!

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Summary Bean Validation annotations Helper Base (HelperBaseCh5) Error map and interfaces for the error Controller Helper Modify the logic for the buttons/actions JSP ${helper.errors.someField}

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Post versus Get? Post does not encode data in URL Post has two additional headers Content-Type Content-Length A blank line follows content-length and then data is encoded in the request.

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Post Request

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Using Post Change the form method.

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POST Request is only generated when button is clicked It allows to know if is the first time in the form or not Hide Data No limit to the amount of data. More secure??? GET Request is created when Types url into browser Follows Hypertext link Click in button of form

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Controller Protected void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException { ControllerHelper helper = new ControllerHelper(this,request,response); Helper.doPost(); }

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ControllerHelper Public void doPost() throws ServletException, IOException { addHelperToSession(helper,SessionData.READ); String address = executeButtonMethod(); request.getRequestDispatcher(address).forward( request, response); }

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ControllerHelper Public void doGet() throws ServletException, IOException { addHelperToSession(helper,SessionData.IGNORE); String address = editMethod(); request.getRequestDispatcher(address).forward( request, response); }

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Hibernate: BEAN DB Focuses in the data Generate SQL statements to save the bean Update a bean Remote a bean Create tables into database

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Hibertante jar files Zip files in moodle site and book site Hibernate.zip and non-hibernate.zip Jar files needed for hibernate (table 5.3)

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Configuration Use java program Use XML

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Configuration via java InitHibernate method in Controller Helper Properties props = new Properties(); props.setProperty("hibernate.dialect","org.hibernate.dialect.MySQLDialect"); props.setProperty("hibernate.connection.driver_class", "com.mysql.jdbc.Driver"); props.setProperty("hibernate.c3p0.min_size", "1"); props.setProperty("hibernate.c3p0.max_size", "5"); props.setProperty("hibernate.c3p0.timeout", "300"); props.setProperty("hibernate.c3p0.max_statements", "50"); props.setProperty("hibernate.c3p0.idle_test_period", "300"); props.setProperty("hibernate.connection.url","jdbc:mysql://SERVER:PORT /DATABASE"); props.setProperty("hibernate.connection.username", "USERNAME"); props.setProperty("hibernate.connection.password", "PASSWORD"); initSessionFactory(props,RequestDataPersistent.class);

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Configuration via XML XML overrides java configuration Place file in the same directory as your classes. File name hibernate.cfg.xml

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Creating Tables 1. Manually create the database 2. Add a conditional statement in web.xml and created them in the java.code

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web.xml PersistentController ch5.persistentData.Controller create false

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Reading CREATE Boolean create = Boolean.parseBoolean(servlet.getInitParame ter(create); if (create) { HibernateHelper.createTable(RequestDataPersistent.class); }

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Simplify initHibernate Static public void initHibernate(boolean create) { if (create) { HibernateHelper.createTable(RequestDataPersistent.class); } HibernateHelper.initSessionFactory(RequestDataPersistent.class) }

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Init controller See initHibernate page 165 If you are not using xml See initHibernate page 181 If you are using xml In the Controller public void init() { ControllerHelper.initHibernate(this); }

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Controller

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Closing hibernate Configure a listener in web.xml shared.WebappListener .

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Closing hibernate use WebappListener in shared package. Why use the listener?

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WebappListener public class WebappListener implements ServletContextListener { public void contextInitialized(ServletContextEvent sce) {} public void contextDestroyed(ServletContextEvent sce) { try { Enumeration enumer = DriverManager.getDrivers(); while (enumer.hasMoreElements()) { DriverManager.deregisterDriver(enumer.nextElement()); } catch (java.sql.SQLException se) { se.printStackTrace(); } shared.HibernateHelper.closeFactory(); }

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Persistent Annotations Annotate the bean with @Entity @Id @GeneratedValue @Transient

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@Entity Creates a table based on a bean Import javax.persistence.Entity; @Entity public class RequestDataPersistent implements Serializable { }

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Primary Key @Id Specifies the primary key. Use @GeneratedValue if you want automatic assigment. If Primary key is SSN, make sure is not editable by the user.

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Primary Key @Id Import javax.persistance.Id; Import javax.persitance.GeneratedValue; Protected Long id; @Id @Generated Value public Log getId() {return id;} private void setId(Long id) { this.id = id;} ">

Looping in JSP using JSTL ${row.id}, ${row.hobby}, ${row.aversion}, ${row.daysPerWeek} {/core:foreEach>

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Looping in JSP using JSTL

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Using Persistent Data (page 177/178) 1.Add Hibernate Jar Files 2.Initialize Hibernate when controller is loaded into memory 3.Add the WebappListener to shared Package 4.Add the Statements to the web.xml file 5.Annotate the bean class as an entity 6.Add an Id field to the bean (PersistentBase) 7.Add properties to bean

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Using Persistent Data (page 177/178) 8.Add statements to web.xml 9.Add initHibernate method to ControllerHelper 10.Modify process Method (next slide) 11.In the process page, display the data from the database using Expression Language

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ControllerHelper: PersistentData Modify processMethod (see page 179) public String processMethod(){ if (!isValid(data)) { return jspLocation(Expired.jsp); } HibernateHelper.updateDB(data); List list = hibernateHelper.getListData(data.getClass()); Request.setAttribute(database,list); return jsplocation(Process.jsp); }

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PersistentBase Basic description of class follows

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initSessionFactory Initialized hibernate for application static public void initSessionFactory(Properties props, Class... mappings) static public void initSessionFactory(Class... mappings) Examples initSessionFactory(props,RequestDataPersistent. class) initSessionFactory(props,bean1.class, bean2.class,bean3.class,bean4.class,)

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createTable Create tables from specified beans. static public void createTable(Properties props, Class... mappings) Examples createTable(props,RequestDataPersistent.class) createTable(props,bean1.class, bean2.class,bean3.class,bean4.class,)

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closeFactory It closes the Hibernate Factory that was created with the InitSessionFactory static public void closeFactory()

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updateDB Updates database from bean or list of beans static public void updateDB(Object obj) Single bean static public void updateDB(java.util.List list) List of beans

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saveDB Saves bean to Database. static public void saveDB(Object obj)

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removeDB Removes bean from DB static public void removeDB(Object obj)

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getListData static public java.util.List getListData( Class classBean, String strKey, Object value) static public java.util.List getListData( Class classBean, String strKey1, Object value1, String strKey2, Object value2) static public java.util.List getListData( Class classBean)

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getListData

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getFirstMatch static public Object getFirstMatch( Class classBean, String strKey, Object value) static public Object getFirstMatch

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getKeyData static public Object getKeyData(Class beanClass, long itemId)

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isSessionOpen static public boolean isSessionOpen()

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Next class We will start Chapter 6