ActionForm -
Action -. ActionForm, (, ). ActionForm , , .. , , set-. , login=goch,
ActionForm setLogin() . Struts .
ActionForm setCompany() getCompany() Company, Employee, Address.
company.employees[n].address.phone,
:
getCompany().getEmployees().getItem(n).getAddress().setPhone().
, - Struts HTTP- URL- Action.
Action ,
, execute() ActionForm ActionMapping. Action Model
View .
- . , JSP-. (mappings) - . (Low Coupling) -, .
JSP- , , HTML-, ,
(action tags). Struts , Struts. , .
Java Server Pages Struts. , Struts , .
. 1. JSP Struts-.
/* # 1: Action : LoginAction.java */
package by.bsu.famcs.jspservlet;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionMessage;
import org.apache.struts.action.ActionMessages;
public class LoginAction extends Action {
public ActionForward execute(ActionMapping mapping,
ActionForm form, HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException {
ActionMessages errors = new ActionMessages();
LoginForm actionForm = (LoginForm)form;
String login = actionForm.getLogin();
String password = actionForm.getPassword();
if (login!= null && password!= null) {
if (LoginLogic.checkLogin(login, password)) {
return mapping.findForward(" success ");
} else {
errors.add(ActionMessages.GLOBAL_MESSAGE,
new ActionMessage("error.login.incorrectLoginOrPassword"));
saveErrors(request, errors);
}
}
//
return mapping.findForward(" loginAgain ");
}
}
LoginForm, , , : /* # 2: , login.jsp: LoginForm.java */package by.bsu.famcs.jspservlet;
import javax.servlet.http.HttpServletRequest;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;
public class LoginForm extends ActionForm {
private String login;
private String password;
//
public void reset(ActionMapping mapping,
HttpServletRequest request) {
super. reset(mapping, request);
this. password = null;
}
public String getLogin() {
return login;
}
public String getPassword() {
return password;
}
public void setLogin(String login) {
this. login = login;
}
public void setPassword(String password) {
this. password = password;
}
} LoginLogic, -, . Struts. ConfigurationManager , struts-config.xml./* # 3: , config.properties
: ConfigurationManager.java */
package by.bsu.famcs.jspservlet.manager;
import java.util.ResourceBundle;
public class ConfigurationManager {
private static ConfigurationManager instance;
private ResourceBundle resourceBundle;
private static final String BUNDLE_NAME = "config";
public static final String DATABASE_DRIVER_NAME = "DATABASE_DRIVER_NAME";
public static final String DATABASE_URL = "DATABASE_URL";
public static ConfigurationManager getInstance() {
if (instance == null) {
instance = new ConfigurationManager();
instance.resourceBundle =
ResourceBundle.getBundle(BUNDLE_NAME);
}
return instance;
}
public String getProperty(String key) {
return (String)resourceBundle.getObject(key);
}
}
config.properties:
###############################
## Application configuration ##
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###############################
DATABASE_DRIVER_NAME=com.mysql.jdbc.Driver
DATABASE_URL=jdbc:mysql://localhost:3306/db1?user=
root&password=pass
JSP- : <%-- # 4: Struts:index.jsp --%><%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01
Transitional//EN">
<html><head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Index JSP</title>
</head>
<body>
<a href="login.do">Controller</a>
</body></html>
<%-- # 5: :login.jsp --%><%@ page language="java" contentType="text/html;
charset=ISO-8859-1" pageEncoding="ISO-8859-1"%>
<%-- Struts--%>
<%@ taglib uri="/WEB-INF/struts-bean.tld" prefix="bean" %>
<%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01
Transitional//EN">
<html:html locale="true">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<%-- .properties --%>
<title><bean:message key="jsp.login.title"/></title>
<%-- <base> href, URL
application.
--%>
<html:base />
</head>
<body>
<h3><bean:message key="jsp.login.header"/></h3>
<hr/ ><%-- --%>
<html:form action=" /login " method="POST">
<bean:message key="jsp.login.field.login"/>:<br>
<%-- --%>
<html:text property=" login "/><br>
<bean:message key="jsp.login.field.password"/>:<br>
<%-- --%>
<html:password property=" password "
redisplay="false"/><br>
<html:submit><bean:message
key="jsp.Login.button.submit"/> </html:submit>
</html:form>
<%-- , / --%>
<html:errors/>
<hr/>
</body>
</html:html>
<bean:message key="jsp.login.header"/>,
,
ApplicationResources.properties. , , key. , LoginAction , :
errors.add(ActionMessages.GLOBAL_MESSAGE,
new ActionMessage("error.login.incorrectLoginOrPassword"));
: # # 6: : ApplicationResources.properties # header footer, # , <errors/>.errors.header=<ul>
errors.footer=</ul>
errors.prefix=<li>
errors.suffix=</li>
# <errors/>,
# , .
error.login.incorrectLoginOrPassword=<li>incorrect login or password</li>
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# login.jsp
jsp.login.title=Login
jsp.login.header=Login
jsp.login.field.login=Login
jsp.login.field.password=Password
jsp.login.button.submit=Enter
# main.jsp
jsp.main.title=Welcome
jsp.main.header=Welcome
jsp.main.hello=Hello
# error.jsp
jsp.error.title=Error
jsp.error.header=Error
jsp.error.returnToLogin=Return to login page struts-config.xml, , Struts. # 7: action, forward, resource ..: struts-config.xml<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts-config PUBLIC "-//Apache
Software Foundation//DTD Struts Configuration 1.2//EN"
"http://jakarta.apache.org/struts/dtds/struts-config_1_2.dtd">
<struts-config>
<data-sources>
<!-- . , . -->
</data-sources>
<!-- ========== Form Bean Definitions -->
<form-beans>
<form-bean name="loginForm"
type="by.bsu.famcs.jspservlet.LoginForm" />
</form-beans>
<!-- ============== Global Exception Definitions ( )-->
<global-exceptions>
</global-exceptions>
<!-- ============== Global Forward Definitions( ) -->
<global-forwards>
</global-forwards>
<!-- =============== Action Mapping Definitions -->
<action-mappings>
<!-- Action -->
<action name="loginForm"
path="/login"
scope="request" <!- . , , . -->
type="by.bsu.famcs.jspservlet.LoginAction"
validate="false">
<!-- JSP, action -->
<forward name="againlogin" path="/WEB-INF/jsp/login.jsp" />
<forward name="success" path="/WEB-INF/jsp/main.jsp" />
</action>
</action-mappings>
<!-- =================== Message Resources Definitions -->
<!-- .properties, . classes. -->
<message-resources parameter=
"resources.ApplicationResources"/>
</struts-config>
<action> path /login JSP ActionForm, . login.jsp FORM ACTION., , .
<forward> , success login, /jsp/login.jsp /jsp /main.jsp . findForward() ActionMapping . web.xml ActionServlet struts-config.xml, servlet-mapping . # 8: : web.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd">
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<web-app id="WebApp">
<display-name>Study</display-name>
<!-- Struts ActionServlet -->
<servlet>
<servlet-name>action</servlet-name>
<servlet-class>
org.apache.struts.action.ActionServlet</servlet-class>
<!-- Struts struts-config.xml -->
<init-param>
<param-name>config</param-name>
<param-value>WEB-INF/struts-config.xml</param-value>
</init-param>
<init-param>
<param-name>debug</param-name>
<param-value>2</param-value>
</init-param>
<init-param>
<param-name>detail</param-name>
<param-value>2</param-value>
</init-param>
<init-param>
<param-name>validate</param-name>
<param-value>true</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<!-- (mapping) , , , .do -->
<servlet-mapping>
<servlet-name>action</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<!-- struts- ( ) -->
<taglib>
<taglib-uri>/WEB-INF/struts-bean.tld</taglib-uri>
<taglib-location>/WEB-INF/struts-bean.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>/WEB-INF/struts-html.tld</taglib-uri>
<taglib-location>/WEB-INF/struts-html.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>/WEB-INF/struts-logic.tld</taglib-uri>
<taglib-location>/WEB-INF/struts-logic.tld</taglib-location>
</taglib>
</web-app>
, datasource struts-config.xml, :
# 9: : data-sources <data-sources><data-source type="org.apache.commons.dbcp.BasicDataSource">
<set-property
property="driverClassName"
value="com.mysql.jdbc.Driver" />
<set-property
property="url"
value="jdbc:mysql://localhost/_" />
<set-property
property="username"
value="root" />
<set-property
property="password"
value="pass" />
<set-property
property="maxActive"
value="10" />
<set-property
property="maxWait"
value="5000" />
<set-property
property="defaultAutoCommit"
value="false" />
<set-property
property="defaultReadOnly"
value="false" />
</data-source>
</data-sources>
, org.apache.struts.action.Action,
getDataSource(HttpServletRequest request)).
<%@ page errorPage="error.jsp" %>
<%@ taglib uri="/WEB-INF/struts-bean.tld" prefix="bean" %>
<%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html" %>
<html:html locale="true">
<head>
<title><bean:message key="jsp.main.title"/></title>
<html:base/>
</head>
<body>
<h3><bean:message key="jsp.main.header"/></h3>
<hr/>
<bean:message key="jsp.main.hello"/>,
<bean:write name="loginForm" property="login"/>
<hr/>
<a href="login.do"><bean:message
key="jsp.error.returnToLogin"/></a>
<html:errors/>
</body>
</html:html>
, , : <%-- # 11: , : error.jsp --%><%@ page isErrorPage="true" %>
<%@ taglib uri="/WEB-INF/struts-bean.tld" prefix="bean" %>
<%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html" %>
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<html:html locale="true">
<head>
<title><bean:message key="jsp.error.title"/></title>
<html:base/>
</head>
<body>
<h3><bean:message key="jsp.error.header"/></h3>
<hr>
<%=(exception!= null)? exception.toString():
"unknown error"%>
<hr>
<a href="login.do"><bean:message key="jsp.error.returnToLogin"/></a>
</body>
</html:html>
, Struts, struts.jar Java- : struts-bean.tldstruts-html.tld
struts-logic.tld
, :http://localhost:8080/StrutsProjectAction
Action, Action . Action execute(), . DispatchAction
. , User UserDispatchAction save(), delete(), list() ., , struts-config.xml action.
<action path="/ModuleAction"
type="com.struts.ModuleDispatchAction"
parameter="method"
...</action> JSP method, , . :<a href="ModuleAction.do? method=edit &id=1>Edit</a>
<a href="ModuleAction.do? method=view &id=1>View</a> ModuleDispatchAction. , unspecified() . cancelled(), <html:cancel/>.import org.apache.struts.actions.DispatchAction;
public class ModuleDispatchAction extends DispatchAction{
public ActionForward edit(ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response)
throws IOException,
ServletException {
//
}
public ActionForward view(...)
throws IOException, ServletException {
//
}
...
public ActionForward unspecified(...)
throws IOException, ServletException {
mapping.findForward("methodNotFound");
}
public ActionForward cancelled(ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response)
throws IOException, ServletException {
mapping.findForward("cancelPage");
}
}
LookupDispatchAction DispatchAction. , View, .JSP <html:submit/> , property , <bean:message/> .
<html:form action="ModuleAction.do">
...
<html:submit property=" method ">
<bean:message key=" submit.button.print " />
</html:submit>
<html:submit property=" method ">
<bean:message key=" button.save " />
</html:submit>
</html:form>, DispatchAction, , .
<action path="/ModuleAction"
type="com. struts.ModuleLookupDispatchAction"
parameter="method"
...</action>DispatchAction , getKeyMethodMap(), mapping .
import org.apache.struts.actions.LookupDispatchAction;
...
public class ModuleLookupDispatchAction
extends LookupDispatchAction {
private static Map m = new HashMap();
static {
m.put("myapp.submit.button.print","print");
m.put("myapp.submit.button.save","save");
}
protected Map getKeyMethodMap(){
return m;
}
public ActionForward print(...)
throws IOException, ServletException {
...
}
public ActionForward save(...)
throws IOException, ServletException {
...
}...} MappingDispatchAction DispatchAction , , URL- struts-config.xml. MappingDispatchAction <action>:<action path="/userUpdate"
type="com.struts.UserMappingDispatchAction"
parameter="update"
...
<action path="/userAdd"
type="com.struts.UserMappingDispatchAction"
parameter="create"
... parameter , ., , .import org.apache.struts.actions.MappingDispatchAction;
...
public class UserMappingDispatchAction
extends MappingDispatchAction{
public ActionForward update (ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response)
throws IOException, ServletException {
...
}
public ActionForward create (...)
throws IOException, ServletException {
...
}
...
public ActionForward unspecified(...)
throws IOException, ServletException {
mapping.findForward("methodNotFound");
}
}
Struts
Struts Bean Tags
- cookie
cookie.
<p>Display the properties of our current session ID cookie (if there is one):</p>
<bean:cookie id="sess" name="JSESSIONID" value="JSESSIONID-IS-UNDEFINED"/>
- define
id toScope ( page scope) value, Java bean name a property.
<bean:define id="test1_boolean" name="test1"
property="booleanProperty" toScope=session/>
<bean:define id="test1_double" name="test1"
property="doubleProperty"/>
<bean:define id="test1_float" name="test1"
property="floatProperty"/>
<bean:define id="test1_int" name="test1"
property="intProperty"/>
<bean:define id="test1_long" name="test1"
property="longProperty"/>
<bean:define id="test1_short" name="test1"
property="shortProperty"/>
<bean:define id="test1_string" name="test1"
property="stringProperty"/>
<bean:define id="test1_value" value="ABCDE"/>
- header
.
Display the values of the headers included in this request.<br><br>
<%
java.util.Enumeration names =
((HttpServletRequest) request).getHeaderNames();
%>
<table border="1">
<tr>
<th>Header Name</th>
<th>Header Value</th>
</tr>
<%
while (names.hasMoreElements()) {
String name = (String) names.nextElement();
%>
<bean:header id="head" name="<%= name %>"/>
<tr>
<td><%= name %></td>
<td><%= head %></td>
</tr>
<%
}
%>
- include
. page id.
<bean:include id="index" page="/index.jsp"/>
- message
.
- page
.
- parameter
.
<bean:parameter id="param1" name="param1"/>
- resource
Web-.
<bean:resource id="webxml" name="/WEB-INF/web.xml"/>
- size
java.lang.Integer , .
<bean:size id="dataSize" collection="<%= data %>"/>
- struts
Struts.
- write
.
Struts Html Tags
- button, cancel, checkbox, file, form, frame, hidden, image, img, link, multibox, password, radio, reset, submit, text, textarea
html-.
- errors
.
- javascript
JavaScript-, , .
- messages
.
<%
ActionMessages messages = new ActionMessages();
messages.add("property1",
new ActionMessage("property1message1"));
messages.add("property2",
new ActionMessage("property2message1"));
messages.add("property2",
new ActionMessage("property2message2"));
messages.add(ActionMessages.GLOBAL_MESSAGE,
new ActionMessage("globalMessage"));
request.setAttribute(Action.MESSAGE_KEY, messages);
%>
<html:messages property="property1" message="true" id="msg"
header="messages.header" footer="messages.footer">
<tr><td><%= pageContext.getAttribute("msg") %></td></tr>
</html:messages>
- select, option, optionsCollection
html- select c option . optionsCollection , .
<html:select property="singleSelect" size="10">
<html:option value="Single 0">Single 0 </html:option>
<html:option value="Single 1">Single 1 </html:option>
<html:option value="Single 2">Single 2 </html:option>
<html:option value="Single 3">Single 3 </html:option>
<html:option value="Single 4">Single 4 </html:option>
<html:option value="Single 5">Single 5 </html:option>
<html:option value="Single 6">Single 6 </html:option>
<html:option value="Single 7">Single 7 </html:option>
<html:option value="Single 8">Single 8 </html:option>
<html:option value="Single 9">Single 9 </html:option>
</html:select>
Struts Logic Tags
- empty, notEmpty
, ( ) null .
<logic:empty name="bean" property="nullProperty">
empty
</logic:empty>
<logic:notEmpty name="bean" property="nullProperty">
notEmpty
</logic:notEmpty>
- equal, notEqual
, / .
- forward
URL.
- greaterEqual, lessEqual
, (), , .
- greaterThan, lessThan
, (), .
- iterate
.
<% {
java.util.ArrayList list =
new java.util.ArrayList();
list.add("First");
list.add("Second");
list.add("Third");
list.add("Fourth");
list.add("Fifth");
pageContext.setAttribute("list", list, PageContext.PAGE_SCOPE);
int intArray[] = new int[]
{ 0, 10, 20, 30, 40 };
pageContext.setAttribute("intArray", intArray, PageContext.PAGE_SCOPE);
}%>
<h3>Test 1 - Iterate Over A String Array [0..4]</h3>
<ol>
<logic:iterate id="element" name="bean"
property="stringArray" indexId="index">
<li><em><bean:write name="element"/></em> [<bean:write name="index"/>]</li>
</logic:iterate>
</ol>
<h3>Test 2 - Iterate Over A String Array [0..2]</h3>
<ol>
<logic:iterate id="element" name="bean" property="stringArray" indexId="index"
length="3">
<li><em><bean:write name="element"/></em> [<bean:write name="index"/>]</li>
</logic:iterate>
</ol>
<h3>Test 3 - Iterate Over A String Array [3..4]</h3>
<ol>
<logic:iterate id="element" name="bean" property="stringArray" indexId="index"
offset="3">
<li><em><bean:write name="element"/></em> [<bean:write name="index"/>]</li>
</logic:iterate>
</ol>
<h3>Test 4 - Iterate Over A String Array [1..3]</h3>
<ol>
<logic:iterate id="element" name="bean"
property="stringArray" indexId="index"
offset="1" length="3">
<li><em><bean:write name="element"/></em> [<bean:write name="index"/>]</li>
</logic:iterate>
</ol>
<h3>Test 5 - Iterate Over an Array List</h3>
<ol>
<logic:iterate id="item" name="list" indexId="index">
<li><em><bean:write name="item"/></em> [<bean:write name="index"/>]</li>
</logic:iterate>
</ol>
<h3>Test 6 - Iterate Over an Array List [0..2]</h3>
<ol>
<logic:iterate id="item" name="list" indexId="index"
offset="0" length="3">
<li><em><bean:write name="item"/></em> [<bean:write name="index"/>]</li>
</logic:iterate>
</ol>
<h3>Test 7 - Iterate Over an Array List [2..4]</h3>
<ol>
<logic:iterate id="item" name="list" indexId="index"
offset="2" length="3">
<li><em><bean:write name="item"/></em> [<bean:write name="index"/>]</li>
</logic:iterate>
</ol>
<h3>Test 8 - Iterate Over an int array</h3>
<ol>
<logic:iterate id="item" name="intArray" indexId="index">
<li><em><bean:write name="item"/></em> [<bean:write name="index"/>]</li>
</logic:iterate>
</ol>
<h3>Test 9 - Iterate Over an int array [0..2]</h3>
<ol>
<logic:iterate id="item" name="intArray" indexId="index"
length="3">
<li><em><bean:write name="item"/></em> [<bean:write name="index"/>]</li>
</logic:iterate>
</ol>
<h3>Test 10 - Iterate Over an int array [2..4]</h3>
<ol>
<logic:iterate id="item" name="intArray" indexId="index"
offset="2" length="3">
<li><em><bean:write name="item"/></em> [<bean:write name="index"/>]</li>
</logic:iterate>
</ol>
- messagesNotPresent, messagesPresent
, ActionMessages ActionErrors ( ) .
- notPresent
, .
<logic:present name="bean" property="stringProperty">
present
</logic:present>
<logic:notPresent name="bean" property ="stringProperty">
notPresent
</logic:notPresent>
Struts Nested Tags
, , nested- , .
, , Company, Address .
<%@ page contentType="text/html;charset=UTF-8"
language="java" %>
<%@ taglib uri="/tags/struts-html" prefix="html" %>
<html:html>
<body>
<html:form action="company.do">
Company name:
<html:text property="company.name" size="60" />
<br>
Company address:
<br>
City:
<html:text property=
"company.address.city" size="60" />
<br>
Street:
<html:text property=
"company.address.street" size="60" />
<br>
<html:submit/>
</html:form>
</body>
</html:html>
, getCompany() . getAddress() Company.
nested- JSP :
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib uri="/tags/struts-html" prefix="html" %>
<%@ taglib uri="/tags/struts-nested" prefix="nested" %>
<html:html>
<body>
<html:form action="company.do">
<nested:nest property="company"/>
Company name:
<html:text property="name" size="60" />
<br>
Company address:
<br>
<nested:nest property="address">
City:
<html:text property="city" size="60" />
<br>
Street:
<html:text property="street" size="60" />
<br>
</nested:nest>
</nested:nest>
<html:submit/>
</html:form>
</body>
</html:html>
nest , nested-, , nested-. , nested- , .
(LOGGER)
, , .. API . API Log4j, Jakarta Apache.
API Log4j (, , ). API Log4j : http://logging.apache.org/log4j/. log4j-1.2.13.jar
.
Log4j :
(logger);
(appender);
(layout).
logger , appender, , layout.
java.util.logging . , Log4j, .
Logger
API Logger, . , , , GUI- . , .
logger . , Java. getLogger(String name), name . . . getRootLogger().
(TRACE, DEBUG, INFO, WARN, ERROR, FATAL), . debug(), info(), warn(), error(), fatal(). , , Throwable. , , (TRACE < DEBUG < INFO < WARN < ERROR < FATAL), . . INFO, logger.debug(message) , . . DEBUG < INFO. setLevel(Level level), Level, . , . DEBUG.
:
log(Priority priority, Object message, Throwable t) t.
log(Priority priority, Object message) .
Appender Layout
. , Appender. addAppender(Appender newAppender) Logger Apeender . Appender. ConsoleAppender. FileAppender . , , FileAppender(Layout layout, String filename) setFile(String file). , , . FileAppender(Layout layout, String filename, boolean append) append setAppend(boolean append).
, JDBCAppender, NTEventLogAppender, SMTP- SMTPAppender, SocketAppender.
, , . ,
setAdditivity(boolean additive). .
. , Layout. Layout . :
HTMLLayout HTML-;
XMLLayout XML-;
SimpleLayout .
XML-.
Layout FileAppender ConsoleAppender
setLayout(Layout layout) .
, ( ).
/* # 1: : Demo Log.java */package app6;
import org.apache.log4j.Logger;
import org.apache.log4j.FileAppender;
import org.apache.log4j.SimpleLayout;
import org.apache.log4j.Level;
import java.io.IOException;
public class DemoLog {
static Logger logger = Logger.getLogger(DemoLog. class);
public static void main(String[] args) {
try {
//
factorial(9);
factorial(-3);
} catch (IllegalArgumentException e) {
// ERROR
logger.error("negative argument", e);
}
}
public static int factorial(int n) {
if (n < 0)
throw new IllegalArgumentException(
"argument " + n +" less then zero");
// DEBUG
logger.debug("Argument n is " + n);
int result = 1;
for (int i = n; i >= 1; i--)
result *= i;
// INFO
logger.info("Result is " + result);
return result;
}
}
"log4j.xml" :
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration xmlns:log4j='http://jakarta.apache.org/log4j/'>
<appender name="TxtAppender" class="org.apache.log4j.FileAppender">
<param name="File" value="log.txt" />
<layout class="org.apache.log4j.SimpleLayout"/>
</appender>
<logger name="app6">
<level value="debug" />
</logger>
<root>
<appender-ref ref="TxtAppender" />
</root>
</log4j:configuration>
"app6.DemoLog", log.txt :
DEBUG - Argument n is 9
INFO - Result is 362880
ERROR - negative argument java.lang.IllegalArgumentException: argument -3 less then zero
at app6.DemoLog.factorial(DemoLog.java:35)
at app6.DemoLog.main(DemoLog.java:27)
. :
FileAppender appender =
new FileAppender(
new SimpleLayout(), "log.txt");
logger.addAppender(appender);
logger.setLevel(Level.DEBUG);
XML :
<appender name="ConsAppender" class="org.apache.log4j.ConsoleAppender">
<layout class="org.apache.log4j.SimpleLayout"/>
</appender>
<appender name="XMLAppender" class="org.apache.log4j.FileAppender">
<param name="File" value="log.xml" />
<layout class="org.apache.log4j.xml.XMLLayout"/>
</appender>
<root>
<appender-ref ref="ConsAppender" />
<appender-ref ref="XMLAppender" />
</root>
:
ConsoleAppender appender2 =
new ConsoleAppender(new SimpleLayout());
FileAppender appender3 =
new FileAppender(new XMLLayout(), "log.xml");
logger.addAppender(appender2);
logger.addAppender(appender3);
Logger , , : fine(), info(), warning(), log(), throwing() .
log.xml .
/* # 2: : StandartDemoLog.java */package app6;
import java.io.IOException;
import java.util.logging.FileHandler;
import java.util.logging.Level
import java.util.logging.Logger;
public class StandartDemoLog {
static Logger log = Logger.getLogger("app6");
public static void main(String[] args)
throws SecurityException, IOException {
/* , XMLFormatter,
XML */
FileHandler fh = new FileHandler("log.xml");
log.addHandler(fh);
log.setLevel(Level.WARNING); //
int arr[] = { 5, 6, 1, -4 };
for (int i = 0; i < arr.length; i++) {
int j = arr[i] % 3;
switch (j) {
case 0:
log.fine(arr[i] + "%3 = 0");
break;
case 1:
log.info(arr[i] + "%3 = 1");
break;
case 2:
log.warning(arr[i] + "%3 = 2");
break;
default:
log.severe(arr[i] + "%3 < 0");
}
}
}
}
:
App6.DemoLog main
WARNING: 5%3 = 2
App6.DemoLog main
INFO: 1%3 = 1
App6.DemoLog main
SEVERE: -4%3 < 0
log.xml
<?xml version="1.0" encoding="windows-1251"
standalone="no"?>
<!DOCTYPE log SYSTEM "logger.dtd">
<log>
<record>
<date>2006-03-17T15:39:03</date>
<millis>1142602743635</millis>
<sequence>0</sequence>
<logger>app6</logger>
<level>WARNING</level>
<class>app6.DemoLog</class>
<method>main</method>
<thread>10</thread>
<message>5%3 = 2</message>
</record>
<record>
<date>2006-03-17T15:39:03</date>
<millis>1142602743736</millis>
<sequence>1</sequence>
<logger>app6</logger>
<level>INFO</level>
<class>app6.DemoLog</class>
<method>main</method>
<thread>10</thread>
<message>1%3 = 1</message>
</record>
<record>
<date>2006-03-17T15:39:03</date>
<millis>1142602743736</millis>
<sequence>2</sequence>
<logger>app6</logger>
<level>SEVERE</level>
<class>app6.DemoLog</class>
<method>main</method>
<thread>10</thread>
<message>-4%3 < 0</message>
</record>
</log>
