|
Cloud's SCWCD 1.4 笔记 | |||||||||||||||||||||||||||||||||||||||||
| 1:The Servelt Technology Model | |||||||||||||||||||||||||||||||||||||||||
| 1. | HttpServlet class:
public class MyServlet extends HttpServlet {
public void init() throws ServletException { }
//只执行一次 protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { }
// 如果被overwrite时有可能不会呼叫doXXX()的method，要留意题意的陷阱 protected void doXXX(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { }
// XXX代表Get,Post...etc //不见的程式中一定要写这个method，不写的话它会继承GeneralServlet.doXXX() public void destroy() { }
//只执行一次 } | ||||||||||||||||||||||||||||||||||||||||
| 2. | Http的method POST method可用来处理上传档案的问题。 OPTIONS method可以列出目前处理的HTTP method为何(ex:TRACE,GET,POST)。 GET、PUT、HEAD method有idempotent的特质。 | ||||||||||||||||||||||||||||||||||||||||
| 3. | HTML FORM预设使用 HTTP GET request | ||||||||||||||||||||||||||||||||||||||||
| 4. | ServletResponse的method void setContentType(String type) PrintWriter getWriter() //取得 response 的 text stream 传送字元资料 ServletOutputStream getOutputStream() //取得 response 的 binary stream 传送任何资料 HttpServletResponse的method void addHeader(String headerName, String value) void addIntHeader(String headerName, int value) void addDateHeader(String headerName, long millisecs) void sendRedirect(String newURL) void sendError(int status_code) void sendError(int status_code, String Message) void setStatus(int sc) void setStatus(int sc, String Message) void addCookie(Cookie cookie) //输入的参数型别是Cookie，要留意题意的陷阱 跟HTTP protocal相关的method属于HttpServletResponse,其它的methods通通是属于ServletResponse | ||||||||||||||||||||||||||||||||||||||||
| 5. | ServletRequest的method String getParameter(String paramName) String[] getParameterValues(String param) Enumeration getParameterNames() BufferedReader getReader() //取得 request 的 text stream 可用来接收表单上传的文字档案 ServletInputStream getIutputStream() //取得 request 的 binary stream 可用来接收表单上传的任何档案 HttpServletRequest的method String getHeader(String headerName) int getIntHeader(String name) long getDateHeader(String name) Enumeration getHeaders(String name) Enumeration getHeaderNames() Enumeration getHeaderValues(String headerName) public Cookie [] getCookies() //传回的是Cookie的阵列，要留意题意的陷阱 跟HTTP protocal相关的method属于HttpServletRequest,其它的methods通通是属于ServletRequest | ||||||||||||||||||||||||||||||||||||||||
| 6. | Servlet life-cycle: Load class --> Creates instance of class --> calling the init method --> calling the service method --> calling the doXXX method --> calling the destroy method | ||||||||||||||||||||||||||||||||||||||||
| 7. | 继承GenericServlet的class必需实作service() method 继承HttpServlet的class可以不实作service()、doXXX() method | ||||||||||||||||||||||||||||||||||||||||
| 2: The Structure and Deployment of Web Applications | |||||||||||||||||||||||||||||||||||||||||
| 1. | 要背web.xml中红字部份的义意与用法 <?xml version="1.0" encoding="ISO-8859-1"?> <web-app xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee [url]http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd[/url]” version=”2.4”> <display-name>A Simple Application</display-name> <context-param> <param-name>Webmaster</param-name> <param-value>[email][email protected][/email]</param-value> </context-param> <jsp-config> <taglib> <taglib-uri>...</taglib-uri> <taglib-location>...</taglib-location> </taglib> <jsp-property-group> <url-pattern>...</url-pattern> <el-ignored>true/false</el-ignored> //设成true时，JSP若有EL expression会被当作纯文字来处理 <scripting-invalid>true/false</scripting-invalid> //设成true时，JSP若有scripting的语法会使JSP在Compile成Servlet时产生translation error <include-prelude>...</include-prelude> <include-code>...</include-coda> <is-xml>true/false</is-xml> </jsp-property-group> </jsp-config> <servlet> <servlet-name>catalog</servlet-name> <servlet-class>com.mycorp.CatalogServlet</servlet-class> or <jsp-file>/test.jsp</jsp-file> <init-param> <param-name>catalog</param-name> <param-value>Spring</param-value> </init-param> <load-on-startup>1</load-on-startup> <security-role-ref> <role-name>MGR</role-name> <role-link>manager</role-link> </security-role-ref> </servlet> <servlet-mapping> <servlet-name>catalog</servlet-name> <url-pattern>*.*</url-pattern> //要了解url-pattern的设定方式 </servlet-mapping> <security-role> <role-name>manager</role-name> </security-role> <security-constraint> <web-resource-collection> <web-resource-name>SalesInfo</web-resource-name> <url-pattern>/salesinfo/*</url-pattern> <http-method>GET</http-method> //可以0到多个<http-method>,当0个时，代表外界没有人可以用http的方法存取设限的资料(其余方法如forward,include可被内部程式叫用) </web-resource-collection> <auth-constraint> <role-name>manager</role-name> //可以0到多个<role-name>或是设成"*",当设成"*"时所有人都可以存取,当设成<auth-constraint/>，没有人可以存取 </auth-constraint> <user-data-constraint> <transport-guarantee>NONE/CONFIDENTIAL/INTEGRAL</transport-guarantee> //NONE implies HTTP；CONFIDENTIAL,INTEGRAL imply HTTPS </user-data-constraint> </security-constraint> <login-config> <auth-method>BASIC/FORM/DIGEST/CLIENT-CERT</auth-method> //当<auth-method>为FORM时才需设定<form-login-config> <form-login-config> <form-login-page>/formlogin.html</form-login-page> <form-error-page>/formerror.html</form-error-page> </form-login-config> //当<auth-method>为FORM时才需设定<form-login-config> </login-config> <session-config> <session-timeout>30</session-timeout> //单位是分钟，当值 <= 0 时表示不会自动 timeout </session-config> <mime-mapping> <extension>pdf</extension> <mime-type>application/pdf</mime-type> </mime-mapping> <welcome-file-list> <welcome-file>index.jsp</welcome-file> //一个至多个<welcome-file>，被叫用时照设定时的先后顺序 </welcome-file-list> <error-page> <error-code>404</error-code> or <exception-type>...</exception-type> <location>/404.html</location> </error-page> <filter> <filter-name>Example Filter</filter-name> <filter-class>examples.ExampleFilter</filter-class> </filter> <filter-mapping> <filter-name>Example Filter</filter-name> <servlet-name>FilterMe.jsp</servlet-name> or <url-pattern>/myContext/*</url-pattern> //<url-pattern>的优先权高于<servlet-name> <dispatcher>REQUEST/INCLUDE/FORWARD/ERROR</dispatcher> //一个至多个<dispatcher> </filter-mapping> <listener> <listener-class>Listener 的类别名称</listener-class> //一个至多个<listener-class>，要注意多个listener时的写法 </listener> <listener> <listener-class>Listener 的类别名称</listener-class> </listener> </web-app> | ||||||||||||||||||||||||||||||||||||||||
| 2. | 要了解Web application的档案目录架构(ex:/WEB-INF/里可以放那些东西...etc) | ||||||||||||||||||||||||||||||||||||||||
| 3: The Web Container Model | |||||||||||||||||||||||||||||||||||||||||
| 1. | 只有request scope的资料在传送时是thread safe | ||||||||||||||||||||||||||||||||||||||||
| 2. | Filter class public class TimingFilter implements Filter { public void init(FilterConfig filterConfig) throws ServletException { } public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws ServletException,IOException { chain.doFilter(request, response); //这行的程式非必填的程式码，也可以不写 } public void destroy() { } } | ||||||||||||||||||||||||||||||||||||||||
| 3. | listener class 分成三类：ServletContextListener,HttpSessionListener,ServletRequestListener 注意Method的不同处：HttpSessionListener.sessionCreated(...)，ServletContextListener.contextInitialized(...)，ServletRequestListener.requestInitialized(...) | ||||||||||||||||||||||||||||||||||||||||
| 4. | attribute listener class 分成三类，名称上相似：都叫XXXAttributeListener 提供的Method名称一样：attributeAdded(...)，attributeRemoved(...)，attributeReplaced(...) | ||||||||||||||||||||||||||||||||||||||||
| 5. | HttpSessionAttributeListener.某个Method(HttpSessionBindingEvent e) HttpSessionBindingListener.某个Method(HttpSessionBindingEvent e) 二者输入参数的型别都必为HttpSessionBindingEvent | ||||||||||||||||||||||||||||||||||||||||
| 6. | HttpSessionBindingListener的使用不需在web.xml里作宣告 ，要很清楚HttpSessionBindingListener的使用方式 | ||||||||||||||||||||||||||||||||||||||||
| 7. | listener本身是个Interface，所以可以实作一个class继承多个不同的listener | ||||||||||||||||||||||||||||||||||||||||
| 8. | HttpSessionActivationListener被使用在多个JVM的环境下 | ||||||||||||||||||||||||||||||||||||||||
| 9. | RequestDispatcher rd=request.getRequestDispatcher(相对或绝对路径) RequestDispatcher rd=getServletContext().getRequestDispatcher(绝对路径) //如果设成相对路径还是可以Compile，return值是null | ||||||||||||||||||||||||||||||||||||||||
| 10. | RequestDispatcher ServletRequest.getRequestDispatcher(String path) //来自ServletRequest，不是HttpServletRequest RequestDispatcher ServletContext.getRequestDispatcher(String path) | ||||||||||||||||||||||||||||||||||||||||
| 4: Session Management | |||||||||||||||||||||||||||||||||||||||||
| 1. | HttpSession的method Object getAttribute(String name) void setAttribute(String name, Object value) void removeAttribute(String name) Enumeration getAttributeNames() void invalidate() boolean isNew() void setMaxInactiveInterval(int seconds) //单位是秒，当值 < 0 时表示不会自动 timeout | ||||||||||||||||||||||||||||||||||||||||
| 2. | HttpServletRequest.getSession(false)在取得HttpSession时，如果HttpSession不存在，不会自动产生，会return null | ||||||||||||||||||||||||||||||||||||||||
| 3. | Sesssion tracking mechanisms：Cookies，SSL Sessions，URL Rewriting | ||||||||||||||||||||||||||||||||||||||||
| 4. | HttpServletResponse的URL rewriting Method String encodeURL(String url) String encodeRedirectURL(String url) | ||||||||||||||||||||||||||||||||||||||||
| 5: Web Application Security | |||||||||||||||||||||||||||||||||||||||||
| 1. | Web Application Security的特质有四种： (a)authentication(认证) (b)authorization(授权) (c)data integrity(资料完整性)：指资料从发送方传送到接收方,在传送过程中资料不会被篡改。 (d)confidentiality(私密性)：指除了资料接收方以外,其他人不会存取到这个敏感性资讯的能力及权限。 | ||||||||||||||||||||||||||||||||||||||||
| 2. | HttpServletRequest中与验证使用者相关的Method String getRemoteUser() java.security.Principal getUserPrincipal() boolean isUserInRole(String role) | ||||||||||||||||||||||||||||||||||||||||
| 3. | Authentication types有下列四种 BASIC：传输的资料不加密(不安全)，不需自订输入帐号与密码的Form(Browser会pop up一个输入的表单) DIGEST：传输的资料加密(安全)，不需自订输入帐号与密码的Form(Browser会pop up一个输入的表单) FORM：传输的资料不加密(不安全)，要自订输入帐号与密码的Form CLIENT-CERT：用Public Key Certificate的机制(安全) | ||||||||||||||||||||||||||||||||||||||||
| 6: The JavaServer Pages (JSP) Technology Model | |||||||||||||||||||||||||||||||||||||||||
| 1. |
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| 2. |
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| 3. |
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| 4. | JSP page life cycle(JSP的本质是Servlet): JSP page translation --> JSP page compilation --> load class --> create instance --> call the jspInit method(可以被改写)--> call the _jspService method(不能被改写) --> call the jspDestroy method(可以被改写) | ||||||||||||||||||||||||||||||||||||||||
| 5. |
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| 6. |
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| 7. | include directive不能指向 servlet，include action, forward action 可以指向 servlet | ||||||||||||||||||||||||||||||||||||||||
| 8. |
JSP转译成Servlet的class
public class MyServlet_jsp extends XXXXXX{ public void jspInit() { }
// 这个Method继承自javax.servlet.jsp.JspPage这个interface //只执行一次，可以在JSP档案中用declaration的方式改写 public void _jspService(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { }
//这个Method继承自javax.servlet.jsp.HttpJspPage这个interface //不能在JSP档案中改写 public void jspDestroy() { }
//这个Method继承自javax.servlet.jsp.JspPage这个interface //只执行一次，可以在JSP档案中用declaration的方式改写 } | ||||||||||||||||||||||||||||||||||||||||
| 9. | <% = "Hello" ; %> //会产生exception，要了解exception的原因 | ||||||||||||||||||||||||||||||||||||||||
| 10. | 下列的JSP DECLARATION是合法的 <%! Hashtable ht = new Hashtable(); { ht.put("max", "10"); // { }拿掉会导致Compile error } %> | ||||||||||||||||||||||||||||||||||||||||
| 7: Building JSP Pages Using the Expression Language (EL) | |||||||||||||||||||||||||||||||||||||||||
| 1. |
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| 2. | EL operators: property access (the . operator), collection access (the [] operator). . operator只能用在物件型别为Map或JavaBean，[] operator则无任何限制 | ||||||||||||||||||||||||||||||||||||||||
| 3. | EL operators中比较需要注意之处 Relational : ==, eq, !=, ne, <, lt, >, gt, >=, ge, <=, leEmpty : ${!empty param.Add}Conditional : A ? B : C | ||||||||||||||||||||||||||||||||||||||||
| 4. | EL function的写法 package mypkg; public class MyLocales { ... public static boolean equals( String a, String b ) { //必为 public static return a.equals(b); } } | ||||||||||||||||||||||||||||||||||||||||
| 5. | EL function在xxx.tld中的宣告方式 <function> <name>equals</name> <function-class>mypkg.MyLocales</function-class> <function-signature>boolean equals( java.lang.String, java.lang.String )</function-signature> </function> | ||||||||||||||||||||||||||||||||||||||||
| 6. | EL expression的出题陷阱 ${10 * 1.5} //结果是15.0 ${123 / 0} //结果是Infinity ${0 / 0} //结果是NaN ${"" + 1} //结果是1 ${" " + 1 } //产生Exception ${123 % 0} //产生Exception ${0 % 0} //产生Exception | ||||||||||||||||||||||||||||||||||||||||
| 8: Building JSP Pages Using Standard Actions | |||||||||||||||||||||||||||||||||||||||||
| 1. |
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| 2. |
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| 3. | <jsp :useBean id="persion" type="scwcd.Person" class="scwcd.Employee" /> //scwcd.Person是scwcd.Employee的super class，利用此方法可以达到polymorphic的效果 | ||||||||||||||||||||||||||||||||||||||||
| 4. | 在<jsp:useBean ... />中 If type is used wtihout class,the bean must already exit.不然会产生exception. If class is used(with or without type) the class must Not be abstract or interface,and must have a public no-arg constructor <jsp:useBean id="mybean" beanName="my.app.MyBean" type="my.app.MyBean" />,beanName只能与type同时出现 | ||||||||||||||||||||||||||||||||||||||||
| 5. | <% out.flush() %> <jsp:forward .../> 此种写法会使forward失效，不被执行，而且不会产生exception | ||||||||||||||||||||||||||||||||||||||||
| 9: Building JSP Pages Using Tag Libraries | |||||||||||||||||||||||||||||||||||||||||
| 1. | JSTL的Core Tag Library <c:out value="${username}" escapeXml="false" /> //要了解escapeXml代表的义意 <c:set var="four" scope="session" value="${3+1}" /> <c:remove var="dommed" scope="session" /> <c:catch var="e"> //var的值可以在catch block之外被使用，<c:catch>的功能与try...catch写法中的catch相似 ... Program code that may throw an exception ... </c:catch> <c:if test="${e != null}"> The caught exception is <c:out value="${e}"/> </c:if> <c:if test="${e == null}"> No exception was thrown </c:if> <c:choose> <c:when test="${error1}"> Error1 </c:when> //一定要有test这个attribute <c:when test="${error2}"> Error2 </c:when> <c:when test="${error3}"> Error3 </c:when> <c:otherwise> Otherwise </c:otherwise> //不能有test这个attribute，此外<c:otherwise>这个tag非必需 </c:choose> <c:forEach items="${user.medicalConditions}" var="aliment"> <c:out value="${aliment}"/> //如果这行改成<%=aliment %>会产生exception，不能用scriptling来存取<c:forEach>中的值 </c:forEach> <c:forTokens items="a;b;c;d" delims=";" var="current"> <c:out value="${current}"/> </c:forTokens> <c:url value="buy.jsp"> //<c:url>的功能是url rewriting，不是url encoding，url带参数时要用范例中的写法 <c:param name="stock" value="IBM"/> </c:url> <c:import context="/other" url="/directory/target.jsp"/> //可以import其它Web application的的资料 <c:param name="first" value="one"/> <c:param name="second" value="two"/> </c:import> <c:redirect context="/brokerage" url="/buy.jsp"> //可以redirect其它Web application的的资料 <c:param name="stock" value="IBM"/> </c:redirect> | ||||||||||||||||||||||||||||||||||||||||
| 2. | <c:set target="${myDog}" property="dogName" value="可鲁" /> target必需放Object，不能是String。利用此法可以设定Bean的property。 | ||||||||||||||||||||||||||||||||||||||||
| 10: Building a Custom Tag Library | |||||||||||||||||||||||||||||||||||||||||
| 1. | tag file与simple tag相似，tag file在执行前会先被转换成simple tag才被执行。二者在接收到新的request时都会产生新的instance。二者的body content设定都不能设为JSP | ||||||||||||||||||||||||||||||||||||||||
| 2. | tag support与body tag support相似，二者都只产生一个instance被多个request共用(跟Servlet的架构相似) | ||||||||||||||||||||||||||||||||||||||||
| 3. | classic tag
| ||||||||||||||||||||||||||||||||||||||||
| 4. | tag support与body tag support用 PageContext class 取得 implicit variable simple tag用getJspContext() method取得 implicit variable | ||||||||||||||||||||||||||||||||||||||||
| 5. | 抓取parent tag的method Tag getParent() static Tag findAncestorWithClass (Tag from, java.lang.Class klass) | ||||||||||||||||||||||||||||||||||||||||
| 6. | Simple tag class的写法 public class MySimpleTag extends SimpleTagSupport { StringWriter sw = new StringWriter(); public void doTag() throws JspException, IOException { getJspContex().getOut().write(sw.toString()); getJspBody().invoke(null); } } Tag support class的写法(body tag support class的写法与它相似) public class MyTag extends TagSupport { public int doStartTag() throws JspException{ ... return SKIP_BODY/EVAL_BODY_INCLUDE; } public int doAfterBody() throws JspException{ ... return SKIP_BODY/EVAL_BODY_AGAIN ; } public int doEndTag() throws JspException{ ... return SKIP_PAGE/EVAL_PAGE; } } 要了解simple tag与classic tag二者在写法上的不同处 | ||||||||||||||||||||||||||||||||||||||||
| 7. | Tag file的写法 <%@ attribute name="fontColor" required="true" rtexprvalue="true" %> <%@ tag body-content="empty/tagdependent/scriptless"%> <font color="${fontColor}"><jsp:doBody/></font><br> Tagfile可以使用的directives: taglib, include, tag, attribute, variable. | ||||||||||||||||||||||||||||||||||||||||
| 8. | tag class在xxx.tld的宣告方式 <uri>...</uri> <tag> <name>callEJB</name> <tag-class>com.example.web.tags.EJBCallTagHandler</tag-class> <body-content>empty/tagdependent/scriptless/JSP</body-content> //设成empty时，如果JSP档里的tag body却包含资料，会在执行时产生Exception //设成scriptless时，如果JSP档里的tag body却包含scripting的叙述，会在执行时产生Exception //设成tagdependent的话表示不作任何处理，直接将本体内容传给标签库，由标签库自行处理本体内容 <attribute> <name>user</name> <required>true/false/yes/no</required> //设成true时，如果JSP档里面没有设定这个attribute会在执行时产生Exception <rtexprvalue>true</rtexprvalue> //设成false时，如果JSP档里面有rtexprvalue的写法会在执行时产生Exception </attribute> </tag> | ||||||||||||||||||||||||||||||||||||||||
| 9. | SkipPageException stops only the page thata directly invoked the simple tag | ||||||||||||||||||||||||||||||||||||||||
| 10. | Simp tag life cycle Load class --> Instantiate class --> call setJspContext() method --> call setParent() method --> call attribute setters(不一定会执行) --> call setJspBody()(不一定会执行) --> call doTag() | ||||||||||||||||||||||||||||||||||||||||
| 11. | classic tag life cycle Load class --> Instantiate class --> call setPageContext() method --> call setParent() method --> call attribute setters(不一定会执行) --> call doStartTag() --> call doAfterBody() --> call doEndTag() | ||||||||||||||||||||||||||||||||||||||||
| 12. | SimpleTag在xxx.tld中的<body-content>设定不能设为JSP，body content不可以使用sriptlet的语法 Tag file的<%@ tag body-content="..."%>不能设为JSP，body content不可以使用sriptlet的语法 | ||||||||||||||||||||||||||||||||||||||||
| 13. | <prefix:sometag> <jsp:attribute name='attrA'>val1</jsp:attribute> //不能写成<jsp:attribute name='attrA' value='val1' />，要注意 </prefix:sometag> | ||||||||||||||||||||||||||||||||||||||||
| 14. | public class MyTag extends TagSupport { public int doStartTag() throws JspException{ if(somecondition) { return EVAL_BODY_INCLUDE; } else { PageContext.forward(...) or PageContext.include(...) //有些考题会在这部份作陷井，要注意 } } ...etc } | ||||||||||||||||||||||||||||||||||||||||
| 15. | If we extend BodyTagSupport, then we use BodyTagSupport.getPreviousOut() to get the "previous" or "enclosing" JspWriter. | ||||||||||||||||||||||||||||||||||||||||
| 16. | 如果tag class被包在jar file里面。在使用tag class之前不需在web.xml作taglib的设定。只要在JSP档里宣告<%@ taglib prefix...etc %>就可以使用这个tag | ||||||||||||||||||||||||||||||||||||||||
| 11: J2EE Patterns | |||||||||||||||||||||||||||||||||||||||||
| 1. | Business Delegate Pattern(参照HeadFirstSevlet&JSP p:746) | ||||||||||||||||||||||||||||||||||||||||
| 2. | Service Locator Pattern(参照HeadFirstSevlet&JSP p:747) | ||||||||||||||||||||||||||||||||||||||||
| 3. | Transfer Object Pattern(参照HeadFirstSevlet&JSP p:748) | ||||||||||||||||||||||||||||||||||||||||
| 4. | Intercepting Filter Pattern(参照HeadFirstSevlet&JSP p:749) | ||||||||||||||||||||||||||||||||||||||||
| 5. | MVC Pattern(参照HeadFirstSevlet&JSP p:750) | ||||||||||||||||||||||||||||||||||||||||
| 6. | Front Controller Pattern(参照HeadFirstSevlet&JSP p:751) | ||||||||||||||||||||||||||||||||||||||||
| 12: 杂七杂八无法分类的部份 | |||||||||||||||||||||||||||||||||||||||||
| 1. | Servlet与Filter class写法相似，二者在web.xml的设定方式亦相似 | ||||||||||||||||||||||||||||||||||||||||
| 2. | EL function与tag class二者在xxx.tld的设定方式相似 | ||||||||||||||||||||||||||||||||||||||||
| 3. | 要能分出下面三者的差异 <%@ include file="myTest.jsp" %> //Static的include方式 <jsp:include page="myTest.jsp"/> //dynamic的include方式 <c:import url="/myTest.jsp" context="/OtherSite"/> //dynamic的include方式，而且可以inlcude不同Web application的资料 | ||||||||||||||||||||||||||||||||||||||||
| 4. | 在Deployment Descriptoer中呼叫的先后顺序:listener->filter->servlet | ||||||||||||||||||||||||||||||||||||||||
| 5. | Both - GenericServlet class and ServletContext interface, provide methods log(String msg) and log(String, Throwable) that write the information to a log file. | ||||||||||||||||||||||||||||||||||||||||
| 6. | JSP Page directive中比较少见的attribute:language,extends,buffer,autoFlush,info | ||||||||||||||||||||||||||||||||||||||||
| 7. | java.net.URL ServletContext.getResource() java.io.InputStream ServletContext.getResourceAsStream() | ||||||||||||||||||||||||||||||||||||||||
| 8. | ServletException provides the getRootCause() method that returns the wrapped exception. It's return type is Throwable, so you have to cast it to appropriate business exception type. | ||||||||||||||||||||||||||||||||||||||||
| 9. | <servlet-mapping> <servlet-name>XServlet</servlet-name> <url-pattern>*.x</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>YServlet</servlet-name> <url-pattern>/y/*</url-pattern> </servlet-mapping>
要了解HeadFirstSevlet&JSP p:588的考题练习 | ||||||||||||||||||||||||||||||||||||||||
| 10. | Request URL = protocol://host:port + contextpath + requestpath + pathinfo | ||||||||||||||||||||||||||||||||||||||||
注：红字部份是特别要注意的考题陷井