01_Servlet概述

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Servlet是什么

就是一个Java类
服务器端小程序
处理用户请求

Servlet的实现

实现Servlet接口
继承GenericServlet类
继承HttpServlet类

编写Servlet

1.新建web项目(helloservlet)
2.编写HelloServlet类

package com.zhushen.Servlet;import java.io.IOException;import javax.servlet.Servlet;import javax.servlet.ServletConfig;import javax.servlet.ServletException;import javax.servlet.ServletRequest;import javax.servlet.ServletResponse;public class HelloServlet implements Servlet {    public void destroy() {     }    public ServletConfig getServletConfig() {        return null;    }    public String getServletInfo() {            return null;    }    public void init(ServletConfig config) throws ServletException {        }    //处理请求    public void service(ServletRequest req, ServletResponse res)            throws ServletException, IOException {        res.getOutputStream().print("Hello Servlet!");    }    public HelloServlet() {    }}

3.在web.xml中部署Servlet

<!-- Servlet的配置     包括两个部分     Servlet     Servlet-Mapping      -->     <servlet>     <!-- Servlet-name可以自定义，但是要唯一 -->        <servlet-name>helloservlet</servlet-name>     <!-- Servlet-class Servlet的完全限定名：包名.类名             检查是否写错的办法：按住ctrl+鼠标看是否能够连接      -->        <servlet-class>com.zhushen.Servlet.HelloServlet</servlet-class>     </servlet>     <servlet-mapping>     <!-- 和Servlet标签中的Servlet-name要一致 -->        <servlet-name>helloservlet</servlet-name>     <!-- 也可以叫做Servletname：这个名称是访问名称：请求路径 -->        <url-pattern>/hello</url-pattern>     </servlet-mapping>

4.访问：localhost:8080/helloservlet/hello（项目名-访问名）

servlet小案例

web.xml

<servlet>    <servlet-name>helloservlet</servlet-name>    <servlet-class>com.zhushen.Servlet.HelloServlet</servlet-class>  </servlet>  <servlet-mapping>    <servlet-name>helloservlet</servlet-name>    <url-pattern>/hello</url-pattern>  </servlet-mapping>

User类

package com.zhushen.vo;public class User {    private  String name;    private int age;    private String sex;    private String phone;    public User() {    }    public User(String name, int age, String sex, String phone) {        super();        this.name = name;        this.age = age;        this.sex = sex;        this.phone = phone;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public int getAge() {        return age;    }    public void setAge(int age) {        this.age = age;    }    public String getSex() {        return sex;    }    public void setSex(String sex) {        this.sex = sex;    }    public String getPhone() {        return phone;    }    public void setPhone(String phone) {        this.phone = phone;    }}

helloservlet

package com.zhushen.Servlet;import java.io.IOException;import java.io.PrintWriter;import java.util.ArrayList;import java.util.List;import javax.servlet.Servlet;import javax.servlet.ServletConfig;import javax.servlet.ServletException;import javax.servlet.ServletRequest;import javax.servlet.ServletResponse;import com.zhushen.vo.User;public class HelloServlet implements Servlet {    public void destroy() {     }    public ServletConfig getServletConfig() {        return null;    }    public String getServletInfo() {            return null;    }    public void init(ServletConfig config) throws ServletException {        }    //处理请求    public void service(ServletRequest req, ServletResponse res)            throws ServletException, IOException {        List<User> list =new ArrayList<User>();        list.add(new User("张三丰",45,"男","17801020294"));        list.add(new User("小芳",22,"女","17801020294"));        list.add(new User("小红",20,"女","17801020294"));        list.add(new User("小明",25,"男","17801020294"));        //响应转码，默认ISO8859-1        res.setCharacterEncoding("utf-8");//必须放在前面        PrintWriter os =res.getWriter();        res.setContentType("text/html;charset=utf-8");        os.print("<html>");        os.print("<head>");        os.print("<title>");        os.print("数据系统");        os.print("</title>");        os.print("</head>");        os.print("<body>");        os.print("<table align='center' width='80%'>");        os.print("<tr>");            os.print("<td>");            os.print("姓名");            os.print("</td>");            os.print("<td>");            os.print("年龄");            os.print("</td>");            os.print("<td>");            os.print("性别");            os.print("</td>");            os.print("<td>");            os.print("电话");            os.print("</td>");        os.print("</tr>");        for(int i=0;i<list.size();i++){            os.print("<tr>");            os.print("<td>");            os.print(list.get(i).getName());            os.print("</td>");            os.print("<td>");            os.print(list.get(i).getAge());            os.print("</td>");            os.print("<td>");            os.print(list.get(i).getSex());            os.print("</td>");            os.print("<td>");            os.print(list.get(i).getPhone());            os.print("</td>");        os.print("</tr>");        }        os.print("</table>");        os.print("</body>");        os.print("</html>");    }    public HelloServlet() {    }}

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