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Loading more content...Tap to View More萌三岁 文控 冲1000快手号:pc44125hhhhWant to watch more? Download Kwai now.101following38PostScan QR Code to Download已阅读并同意
网速快 网速中 网速慢 维护中我很想知道，servlet到底是做什么的 怎么用？_百度知道
我很想知道，servlet到底是做什么的 怎么用？
我看到很多网页上面都说 servlet处理后台，我很想知道 servlet处理后台的表现是什么？什么效果是servlet处理的表现呢？最好能给个例子啊！！
我有更好的答案
HttpServletR/h3&&);
pw.flush();
}}下面是username&
name = req.getParameter(&quotservlet主要就是处理页面传过来的表单数据,页面上的form的action指向到web.xml中://
if(istrun){
req.setPassword(pass)://java.sun.com/xml/ns/j2ee" target="_blank">http://java?xml version=&).
String name = &&lt.setAttribute(&pass&;/a&gt.getRequestDispatcher(&admin/user_info.jsp&quot.返回&lt.userLogin(bo);MyJsp.setContentType(&text&#47,然后在XML中对称节点中找到对应的servlet类去执行你的处理方法.servlet中使用HttpServletRequest和HttpServletResponse来接受和返回数据这个类要继承一个HttpServlet类然后重写他的doGet和doPost方法, HttpServletResponse resp)
throws ServletException, IOException {1;).w3.org/2001/XMLSchema-instance&quot.com/xml/ns/j2ee&
xmlns:xsi=&http, name);
req.io.PrintWimport javax.a href='
istrun =&gt.http.HttpSimport javax:schemaLocation=&http.doPost(req, resp).import java.io.import com.password&/
resp.sendRedirect(&quot.admin/
xmlns=&quot.http.HttpServletR } @Override protected void doPost(HttpServletR);?&&web-app version=&2.4&quot.jsp&);
pw.print(&&h3&用户名或密码错误;&quot.IOException.xml&.wangchao.service.SfInfoScharset=utf-8&quot.jsp'),一般在doGet里this.doPost(req,resp);然后具体的代码在doPost()方法中执行.一个登陆的小例子;&web-app_2_4.getWriter().servlet,点击&lt.xsd&&
&servlet-name&login&/servlet-name&
&servlet-class&com.wangchao.action.LoginAction&/servlet-class&
&/servlet&
&servlet-mapping&
&servlet-name&login&/servlet-name& &url-pattern&/login.do&/url-pattern&
&/servlet-mapping&&/web-app&以下为JSP页面:&%@ page language=&java& import=&java.util.*& pageEncoding=&UTF-8&%&&%String path = request.getContextPath();String basePath = request.getScheme()+&://&+request.getServerName()+&:&+request.getServerPort()+path+&/&;%&&!DOCTYPE HTML PUBLIC &-//W3C//DTD HTML 4.01 Transitional//EN&&&html&
&base href=&&%=basePath%&&&
&title&My JSP 'index.jsp' starting page&/title& &meta http-equiv=&pragma& content=&no-cache&& &meta http-equiv=&cache-control& content=&no-cache&& &meta http-equiv=&expires& content=&0&&
&meta http-equiv=&keywords& content=&keyword1,keyword2,keyword3&& &meta http-equiv=&description& content=&This is my page&& &!-- &link rel=&stylesheet& type=&text/css& href=&styles.css&& --&
&div align=&center&&
&form action=&login.do& method=&post&&
用户名:&input type=&text& name=&username& style=&color: red&&&br&&br&
密 &码:&input type=&password& name=&password& style=&color: green&&&br&&br&
&div align=&center&&
&input type=&submit& value=&登陆&&
&input type=&reset& value=&重填&&
&/body&&/html&; }
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<a href="http, HttpServletResponse resp)
throws ServletException, IOException {
req.setCharacterEncoding(&quot.ServletEimport javax, pass);
req.wangchao.service.SfInfoServiceIpublic class LoginAction extends HttpServlet{
*/ private static final long serialVersionUID = 1L;
pw =; String pass = &
采纳率：11%
。你是大学生么，在servlet中从数据库中读取数据，然后返回到显示页面。等等比如说，填写注册提交后，你输入的数据会被提交到servlet中，然后在servlet把你提交的数据插入到数据库中？是的话。或者，比如你要查询一些数据，当你点“查询”时，会把你的查询条件提交到servlet，然后再跳转到提示注册成功的页面
比如说，一个表单里里面，你点击按钮提交之后，数据会根绝form里面的action属性指向一个servlet，然后servlet会对这些数据进行处理。返回登陆成功或者操作成功的页面。servlet处理前台后台的能力都很强力的。后台主要就是数据库的JDBC操作了。前台的话是也是jdbc的操作。就像我们项目经理说的，servlet和JDBC是狼狈为奸的。因为他们在一起很无敌的存在的。
简单的说一下：Servlet容器(容器在web服务程序里面)是一个Java Web 服务的接口，通过它实现web。Servlet容器里面，当然是执行Servlet的。jsp也是Servlet,说到这里提两点就行了。第一点Servlet有两种作用。一、实现成生html语言，返回给服务程序。二、管理控制客户的请求。(这里你可以去看一下ejb+serlvet+jsp(mvc)的概念。) 第二点使用jsp支持到底用什么框架？我理解就是如果数据部署的初衷是提供企业级的应用(不止提供web的数据供应，也提供其它的[应用程序])的话，用ejb+struts(这里就代替servlet，当然servlet就在它里面)+jsp,如果不是的话，struts+spring+hibernate(+jsp)。
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