黑马android74期基础是Servlet service方法的一个参

responseservice()response对象可以完成对客户端的response==载时，那么可以使用response.getOutputStream()。response.getOutputStream()IllegalStateException异UTF-8编码的！UTF-8来解读响应content-type头来解读响应数据。8KBhtmlutf-8response的utf-8response.setCharaceterEncoding(“utf-8”)；; 8")当你 时，你会发现浏览器地址栏中的URL会变成 200302表示重定向。所以完成重定向的第一步就是设置302。URL，所以完成重Location头，指定第二个请求的URL地址。publicpublicclassAServletextendsHttpServletpublicvoiddoGet(HttpServletRequestrequest,HttpServletResponsethrowsServletException,IOExceptionresponse.setHeader("Location",}}上面代码的作用是：当AServlet后，会通知浏览器重定向到传智主页。客户端浏览器解析publicpublicclassAServletextendsHttpServletpublicvoiddoGet(HttpServletRequestrequest,HttpServletResponsethrowsServletException,IOException{ }}publicclassAServletextendsHttpServletpublicvoidpublicclassAServletextendsHttpServletpublicvoiddoGet(HttpServletRequestrequest,HttpServletResponsethrowsServletException,IOException{ }}重定向的URL地址为：重定向就不要再使用response.getWriter()response.getOutputStream()requestServlet.service()service()service()request对象来获封装了请求正文数据，如果是GETrequest是一个域对象，可以把它当成MaprequestrequestJavaWebServletContext就是域对象，它在整个ServletContext对象。request其中一个，request可以在一个请求中共享数据。requestServletServlet就么会覆盖上一次的值，这一特性与Map相同；ObjectgetAttribute(Stringname)request中的数据，当前在获取之前需要先去才行，例如：StringvalueString)request.getAttribute(“xxx”);xxx的域属性；voidremoveAttribute(Stringname)requestname指定的域URL相关的方法。东西在中很有用；StringgetCharacterEncoding()setCharacterEncoding()，那么返回nullISO-8859-1编码；POST请求中的参数有效！ StringBuffergetRequestURL()：返回请求URL路径，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请求GETPOSTGET1KPOST<form<form o/ParamServlet"参数1：<inputtype="text参数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参数1：<input参数1：<inputtype="text参数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来处Servlet1Servlet2来继续处理这个请求。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()向客户端输出，这一工作应该由BServlet来完成；如果是使用请求包含，那么没有这个限制；ServletJSPAServletBServletGETPOST，重定向的第二个请求一定是超ClassClassLoader绝对路径：<a客户端路径：<a绝对路径：<a客户端路径：<a相对路径：<a <form <inputtype="submitvalue="表单<form <inputtype="submitvalue="表单<form<input<inputtype="submitvalue="表单2和表单2：以“/”开头，相对主机，与当前a.html的主机相同，即最终的页面为；33：不以“/a.html所有路径，即最终的路径为：；publicclasspublicclassAServletextendsHttpServletpublicvoiddoGet(HttpServletRequestrequest,HttpServletResponsethrowsServletException,IOException{ }}假设AServlet的路径为：publicclassAServletextendsHttpServletpublicclassAServletextendsHttpServletpublicrequest,throwsServletException,IOException}}假设AServlet的路径为：<formaction="/<a 改，这一点确实是个问题。这一问题的处理方案会在学习了JSP之后讲解！ response.sendRedirect(request.getContextPath()+ 题的处理方案是使response.sendRedirect(request.getContextPath()+publicclassAServletextendspublicclassAServletextendsHttpServletpublicvoiddoGet(HttpServletRequestrequest,HttpServletResponsethrowsServletException,IOException{}}假设AServlet的路径为：publicclassAServletextendsHttpServletpublicclassAServletextendsHttpServletpublicvoiddoGet(HttpServletRequestrequest,HttpServletResponsethrowsServletException,IOException{}}假设AServlet的路径为：publicclassAServletextendsHttpServletpublicvoiddoGet(HttpServletRequestpublicclassAServletextendsHttpServletpublicvoiddoGet(HttpServletRequestrequest,HttpServletResponsethrowsServletException,IOExceptionStringpath1=this.getServletContext().getRealPath("a.txt");Stringpath2=this.getServletContext().getRealPath("/a.txt");}}path1path2是相同的结果：Classpackage;importpublicpackage;importpublicclassDemopublicvoidfun1()InputStreamin=}publicvoidfun2()InputStreamin=}} 类在 ClassLoaderpublicclassDemopublicvoidpublicclassDemopublicvoidfun1(){InputStreamin=}publicvoidfun2(){InputStreamin=}} ，即 ：：<!DOCTYPE<!DOCTYPE<metahttp-equiv="content-type"content="text/html;charset=UTF-<form名称:<inputtype="text<inputtype="submitvalue="提交<a GETGETrequest.getParameter()获取的数据是被服务ISO-8859-1UTF-