黑馬android74期基礎(chǔ)是Servlet service方法的一個參

responseservice()response對象可以完成對客戶端的response==載時，那么可以使用response.getOutputStream()。response.getOutputStream()IllegalStateException異UTF-8編碼的！UTF-8來解讀響應(yīng)content-type頭來解讀響應(yīng)數(shù)據(jù)。8KBhtmlutf-8response的utf-8response.setCharaceterEncoding(“utf-8”)；; 8")當(dāng)你 時，你會發(fā)現(xiàn)瀏覽器地址欄中的URL會變成 200302表示重定向。所以完成重定向的第一步就是設(shè)置302。URL，所以完成重Location頭，指定第二個請求的URL地址。publicpublicclassAServletextendsHttpServletpublicvoiddoGet(HttpServletRequestrequest,HttpServletResponsethrowsServletException,IOExceptionresponse.setHeader("Location",}}上面代碼的作用是：當(dāng)AServlet后，會通知瀏覽器重定向到傳智主頁。客戶端瀏覽器解析publicpublicclassAServletextendsHttpServletpublicvoiddoGet(HttpServletRequestrequest,HttpServletResponsethrowsServletException,IOException{ }}publicclassAServletextendsHttpServletpublicvoidpublicclassAServletextendsHttpServletpublicvoiddoGet(HttpServletRequestrequest,HttpServletResponsethrowsServletException,IOException{ }}重定向的URL地址為：重定向就不要再使用response.getWriter()response.getOutputStream()requestServlet.service()service()service()request對象來獲封裝了請求正文數(shù)據(jù)，如果是GETrequest是一個域?qū)ο?，可以把它?dāng)成MaprequestrequestJavaWebServletContext就是域?qū)ο?，它在整個ServletContext對象。request其中一個，request可以在一個請求中共享數(shù)據(jù)。requestServletServlet就么會覆蓋上一次的值，這一特性與Map相同；ObjectgetAttribute(Stringname)request中的數(shù)據(jù)，當(dāng)前在獲取之前需要先去才行，例如：StringvalueString)request.getAttribute(“xxx”);xxx的域?qū)傩?；voidremoveAttribute(Stringname)requestname指定的域URL相關(guān)的方法。東西在中很有用；StringgetCharacterEncoding()setCharacterEncoding()，那么返回nullISO-8859-1編碼；POST請求中的參數(shù)有效！ StringBuffergetRequestURL()：返回請求URL路徑，例如：，System.System.out.println("request.getContentLength():"+System.out.println("request.getContentType():"+request.getContentType());System.out.println("request.getContextPath():"+request.getContextPath());System.out.println("request.getMethod():"+request.getMethod());System.out.println("request.getLocale():"+request.getLocale());System.out.println("request.getQueryString():"+request.getQueryString());System.out.println("request.getRequestURI():"+request.getRequestURI());System.out.println("request.getRequestURL():"+request.getRequestURL());System.out.println("request.getServletPath():"+request.getServletPath());System.out.println("request.getRemoteAddr():"+request.getRemoteAddr());System.out.println("request.getRemoteHost():"+request.getRemoteHost());System.out.println("request.getRemotePort():"+request.getRemotePort());System.out.println("request.getScheme():"+request.getScheme());System.out.println("request.getServerName():"+request.getServerName());System.out.println("request.getServerPort():"+Stringip=request.getRemoteAddr();if(ip.equals("")){Stringip=request.getRemoteAddr();if(ip.equals("")){response.getWriter().print("您的IP已 }else}超：一定是GET請求GETPOSTGET1KPOST<form<form o/ParamServlet"參數(shù)1：<inputtype="text參數(shù)2：<inputtype="text<inputtype="submitvalue="提交<a 下面是使用requestpublicpublicvoiddoGet(HttpServletRequestrequest,HttpServletResponsethrowsServletException,IOException{Stringv1=request.getParameter("p1");Stringv2=request.getParameter("p2");System.out.println("p1="+v1);System.out.println("p2="+v2);}publicpublicvoiddoPost(HttpServletRequestrequest,HttpServletResponsethrowsServletException,IOException{Stringv1=request.getParameter("p1");Stringv2=request.getParameter("p2");System.out.println("p1="+v1);System.out.println("p2="+v2);}publicvoiddoGet(HttpServletRequestrequest,publicvoiddoGet(HttpServletRequestrequest,HttpServletResponsethrowsServletException,IOExceptionString[]names=request.getParameterValues("name");}<a參數(shù)1：<input參數(shù)1：<inputtype="text參數(shù)2：<inputtype="text<inputtype="submitvalue="提交o/ParamServlet"<formpublicvoiddoPost(HttpServletRequestrequest,HttpServletResponsethrowsServletException,IOException{Enumerationnames=request.getParameterNames();while(names.hasMoreElements()){ }}Map<String,String[]> p=for(Stringname:par p.keySet()){String[]values=par System.outMap<String,String[]> p=for(Stringname:par p.keySet()){String[]values=par System.out.println(name+":"+}p2:[v2,p1:[v1,ServletServlet1來處Servlet1Servlet2來繼續(xù)處理這個請求。AServletpublicclassAServletextendsHttpServletpublicvoiddoGet(HttpServletRequestrequest,HttpServletResponsethrowsServletException,IOException{RequestDispatcherrd=request.getRequestDispatcher("/BServlet");rd.forward(request,response);}}publicclassBServletextendsHttpServletpublicvoiddoGet(HttpServletRequestrequest,HttpServletResponsethrowsServletException,IOException{}}publicclassBServletextendspublicclassBServletextendsHttpServletpublicvoiddoGet(HttpServletRequestrequest,HttpServletResponsepublicclassAServletextendsHttpServletpublicvoiddoGet(HttpServletRequestrequest,HttpServletResponsethrowsServletException,IOException{RequestDispatcherrd=request.getRequestDispatcher("/BServlet");rd.include(request,response);}}}}throwsServletException,IOExceptionresponse.getWriter()response.getOutputStream()向客戶端輸出，這一工作應(yīng)該由BServlet來完成；如果是使用請求包含，那么沒有這個限制；ServletJSPAServletBServletGETPOST，重定向的第二個請求一定是超ClassClassLoader絕對路徑：<a客戶端路徑：<a絕對路徑：<a客戶端路徑：<a相對路徑：<a <form <inputtype="submitvalue="表單<form <inputtype="submitvalue="表單<form<input<inputtype="submitvalue="表單2和表單2：以“/”開頭，相對主機，與當(dāng)前a.html的主機相同，即最終的頁面為；33：不以“/a.html所有路徑，即最終的路徑為：；publicclasspublicclassAServletextendsHttpServletpublicvoiddoGet(HttpServletRequestrequest,HttpServletResponsethrowsServletException,IOException{ }}假設(shè)AServlet的路徑為：publicclassAServletextendsHttpServletpublicclassAServletextendsHttpServletpublicrequest,throwsServletException,IOException}}假設(shè)AServlet的路徑為：<formaction="/<a 改，這一點確實是個問題。這一問題的處理方案會在學(xué)習(xí)了JSP之后講解！ response.sendRedirect(request.getContextPath()+ 題的處理方案是使response.sendRedirect(request.getContextPath()+publicclassAServletextendspublicclassAServletextendsHttpServletpublicvoiddoGet(HttpServletRequestrequest,HttpServletResponsethrowsServletException,IOException{}}假設(shè)AServlet的路徑為：publicclassAServletextendsHttpServletpublicclassAServletextendsHttpServletpublicvoiddoGet(HttpServletRequestrequest,HttpServletResponsethrowsServletException,IOException{}}假設(shè)AServlet的路徑為：publicclassAServletextendsHttpServletpublicvoiddoGet(HttpServletRequestpublicclassAServletextendsHttpServletpublicvoiddoGet(HttpServletRequestrequest,HttpServletResponsethrowsServletException,IOExceptionStringpath1=this.getServletContext().getRealPath("a.txt");Stringpath2=this.getServletContext().getRealPath("/a.txt");}}path1path2是相同的結(jié)果：Classpackage;importpublicpackage;importpublicclassDemopublicvoidfun1()InputStreamin=}publicvoidfun2()InputStreamin=}} 類在 ClassLoaderpublicclassDemopublicvoidpublicclassDemopublicvoidfun1(){InputStreamin=}publicvoidfun2(){InputStreamin=}} ，即 ：：<!DOCTYPE<!DOCTYPE<metahttp-equiv="content-type"content="text/html;charset=UTF-<form名稱:<inputtype="text<inputtype="submitvalue="提交<a GETGETrequest.getParameter()獲取的數(shù)據(jù)是被服務(wù)ISO-8859-1UTF-