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1、Servlet入门介绍ID:SCSJ004-JSP&ServletAServletcallexample7/25/20212AServletsamplepublicclassHelloWorldServletextendsHttpServlet{publicvoidinit()throwsServletException{//Initializationcode...}publicvoiddoGet(HttpServletRequestreq,HttpServletResponseresp)throwsServletException,IOException{}publicvoidd
2、oPost(HttpServletRequestreq,HttpServletResponseresp)throwsServletException,IOException{}publicvoiddestroy()throwsServletException{//Initializationcode...}}publicvoiddoGet(HttpServletRequestreq,HttpServletResponseres)throwsServletException,IOException{res.setContentType(“text/html”);PrintWritero
3、ut=res.getWriter();out.println("
");out.println("
HelloWorld”);out.println("");out.println("");out.println("
HelloWorld");out.println("");}7/25/20213http://localhost/helloworld
HelloWorldServlet4、t-name>com.softeem.HelloWorld
HelloWorldServlet/helloWorldServlet的调用过程HelloWorldServletTomcat数据库从web.xml中寻找对应的servlet.Service()doGet()7/25/20214类关系图7/25/2
5、0215客户端请求与响应过程7/25/20216doGet与doPosthttp://localhost/helloworld为什么浏览器没有任何响应？publicvoiddoPost(HttpServletRequestreq,HttpServletResponseres)throwsServletException,IOException{res.setContentType(“text/html”);PrintWriterout=res.getWriter();out.println("
");out.println("
HelloWorld<</p><p>6、/TITLE>”);out.println("</HEAD>");out.println("<BODY>");out.println("<BIG>HelloWorld</BIG>");out.println("</BODY></HTML>");}publicvoiddoGet(HttpServletRequestreq,HttpServletResponseres)throwsServletException,IOException{}浏览器的URL，超链接，表单的get提交，都是get提交；Get提交是把数据打包成一个数据包发送到服务器；然而绝大部分的应用是表单的post提交，Po</p><p>7、st提交数据是分多次发送到服务器的，比如文件上传，能传送的总数据量大于get方式。publicvoidexecute(HttpServletRequestreq,HttpServletResponseres)throwsServletException,IOException{res.setContentType(“text/html”);PrintWriterout=res.getWriter();out.println("<HTML><HEAD>");</p> </div>
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