上篇博客中详细介绍了搭建环境的步骤，本篇博客基于上篇博客的基础上实现一些常用的方法。（依赖包也使用上篇博客中的依赖），并创建本次需要的文件。
项目结构创建完成后如下图：

一.编写实体类和控制器以及utils中的代码
1.实体类代码
①Account.java中代码如下：

package cn.lut.domain;import java.io.Serializable;
import java.util.List;
import java.util.Map;/*** @author Roy* @date 2020/7/30 11:10*/
public class Account implements Serializable {private String username;private String password;private Double money;
//绑定集合类型private List<User> list;private Map<String,User> map;@Overridepublic String toString() {return "Account{" +"username='" + username + '\'' +", password='" + password + '\'' +", money=" + money +", list=" + list +", map=" + map +'}';}public List<User> getList() {return list;}public void setList(List<User> list) {this.list = list;}public Map<String, User> getMap() {return map;}public void setMap(Map<String, User> map) {this.map = map;}//引用类型的封装//private User user;/* public User getUser() {return user;}public void setUser(User user) {this.user = user;}
*/public String getUsername() {return username;}public void setUsername(String username) {this.username = username;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}public Double getMoney() {return money;}public void setMoney(Double money) {this.money = money;}
}

②User.java中的代码如下：

package cn.lut.domain;import java.io.Serializable;
import java.util.Date;public class User implements Serializable {private String uname;private Integer age;private Date date;@Overridepublic String toString() {return "User{" +"uname='" + uname + '\'' +", age=" + age +", date=" + date +'}';}public Date getDate() {return date;}public void setDate(Date date) {this.date = date;}public String getUname() {return uname;}public void setUname(String uname) {this.uname = uname;}public Integer getAge() {return age;}public void setAge(Integer age) {this.age = age;}
}

2.编写控制器controller中的代码
基本方法详细介绍

@RequestParam注解的使用把请求中指定的参数给控制器中的形参赋值
@RequestBody注解用于获取请求体内容直接使用得到的是key=value&key=value...结构的数据，get请求方式不适用
@PathVariable注解用于绑定url中的占位符请求url中/delete/{id}这个{id}就是url占位符。
@RequestHeader用于获取请求消息头一般不怎么用。
@CookieValue用于把指定cookie名称的值传入控制器方法参数
@ModelAttribute出现在方法上表示当前方法会在控制器的方法执行之前，先执行，它可以修饰没有返回值的方法，也可以修饰有具体返回值的方法。出现在参数上，获取指定的数据给参数赋值
@SessionAttribute用于多次执行控制器方法间的参数共享

①AnnoController.java中的代码如下：

package cn.lut.controller;import cn.lut.domain.User;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.bind.support.SessionStatus;import java.util.Date;
import java.util.Map;@Controller
@RequestMapping("/anno")
@SessionAttributes(value = {"msg"})//把msg存入到session域中
public class AnnoController {@RequestMapping("/testRequestParam")public String testRequestParam(@RequestParam(name="name") String username){System.out.println("Execute");System.out.println(username);return "success";}/*获取到请求体的内容*/@RequestMapping("/testRequestBody")public String testRequestBody(@RequestBody String body){System.out.println("Execute");System.out.println(body);return "success";}
/*PathVariable注解*/@RequestMapping(value = "/testPathVariable/{sid}",method = RequestMethod.POST)public String testPathVariable(@PathVariable(name = "sid")String id){System.out.println("Execute");System.out.println(id);return "success";}//获取请求头的值@RequestMapping(value = "/testRequestHeader")public String testRequestHeader(@RequestHeader(value = "Accept")String header){System.out.println("Execute");System.out.println(header);return "success";}//获取cookie的值@RequestMapping(value = "/testCookieValue")public String testCookieValue(@CookieValue(value = "JSESSIONID")String cookieValue){System.out.println("Execute");System.out.println(cookieValue);return "success";}// SessionAttributes的注解@RequestMapping(value = "/testSessionAttributes")public String testSessionAttributes(Model model){System.out.println("Execute");model.addAttribute("msg","Hello");return "success";}//获取msg值@RequestMapping(value = "/testSessionAttributes")public String getSessionAttributes(ModelMap modelMap){System.out.println("Execute");String msg=(String) modelMap.get("msg");System.out.println(msg);return "success";}//清楚msg值@RequestMapping(value = "/testSessionAttributes")public String delSessionAttributes(SessionStatus status){System.out.println("Execute");status.setComplete();return "success";}//ModelAttribute@RequestMapping(value = "/testModelAttribute")public String testModelAttribute(@ModelAttribute("abc") User user){System.out.println("Execute");System.out.println(user);return "success";}//该方法先执行无返回值@ModelAttributepublic void showUser(String uname, Map<String,User>map){System.out.println("showUserExecuting....");User user=new User();user.setUname(uname);user.setAge(23);user.setDate(new Date());map.put("abc",user);}/*//该方法先执行有返回值
@ModelAttributepublic User showUser(String uname){System.out.println("showUserExecuting....");User user=new User();user.setUname(uname);user.setAge(23);user.setDate(new Date());return user;}*/
}

请求映射，path请求路径RequestMapping注解作用：建立请求URL和处理请求方法之间的对应关系
属性：value：用于指定请求的URL和path属性的作用是一样的
method:指定请求的方式@RequestMapping(method = {RequestMethod.POST,RequestMethod.GET})params:用于指定限制请求参数的条件，支持简单的表达式，要求请求的参数key和value必须和配置一样。params = {"username"}
header:用于限制请求消息头的条件headers = {"Accept"}

②Hello.java中的代码如下：

package cn.lut.controller;import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;/*** @author Roy* @date 2020/7/29 16:52* 控制器类*/
@Controller
@RequestMapping(path = "/user")
public class HelloController {@RequestMapping(path="/hello")public String sayHello(){System.out.println("Hello SpringMVC");return "success";}@RequestMapping(path = "/testRequestMapping")public String testRequestMapping(){System.out.println("Test RequestMapping....");return "success";}
}

③ParamController.java中的代码如下：

package cn.lut.controller;import cn.lut.domain.Account;
import cn.lut.domain.User;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;/*** @author Roy* @date 2020/7/30 10:56* 请求参数绑定*/
@Controller
@RequestMapping(path = "/param")
public class ParamController {@RequestMapping("/testParam")public String testParam(String username){System.out.println("execute");System.out.println("username:"+username);return "success";}
//请求参数绑定把数据封装到javabean的类中@RequestMapping("/saveAccount")public String saveAccount(Account account){System.out.println("execute");System.out.println(account);return "success";}//自定义类型转换器@RequestMapping("/saveUser")public String saveUser(User user){System.out.println("execute");System.out.println(user);return "success";}//自定义原生API@RequestMapping("/saveServlet")public String saveServlet(HttpServletRequest request, HttpServletResponse response){System.out.println("execute");System.out.println(request);HttpSession session= request.getSession();System.out.println(session);ServletContext servletContext= session.getServletContext();System.out.println(servletContext);System.out.println(response);return "success";}
}

3.编写时间转换格式的代码
StringToDateConverter.java中的代码如下：

package cn.lut.utils;import org.springframework.core.convert.converter.Converter;import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;/*** @author Roy* @date 2020/7/30 11:48* 把字符串转换成日期*/
public class StringToDateConverter implements Converter<String,Date> {@Overridepublic Date convert(String s) {//判断if(s==null){throw new RuntimeException("请出入参数！");}DateFormat df=new SimpleDateFormat("yyyy-MM-dd");//把字符串转换成日期try {return df.parse((s));}catch (Exception e){throw new RuntimeException("参数出错！");}}
}

4.编写配置文件web.xml和springmvc.xml
①web.xml中的配置如下：

<!DOCTYPE web-app PUBLIC"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN""http://java.sun.com/dtd/web-app_2_3.dtd" ><web-app><display-name>Archetype Created Web Application</display-name><!--配置前端控制器-->
<servlet><servlet-name>dispatcherServlet</servlet-name><servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class><!--前端控制其加载配置文件--><init-param><param-name>contextConfigLocation</param-name><param-value>classpath:springmvc.xml</param-value></init-param><load-on-startup>1</load-on-startup>
</servlet><servlet-mapping><servlet-name>dispatcherServlet</servlet-name><url-pattern>/</url-pattern></servlet-mapping><!--配置解决中文乱码的过滤器--><filter><filter-name>characterEncodingFilter</filter-name><filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class><init-param><param-name>encoding</param-name><param-value>UTF-8</param-value></init-param></filter><filter-mapping><filter-name>characterEncodingFilter</filter-name><url-pattern>/*</url-pattern></filter-mapping></web-app>

②springmvc.xml中的配置如下：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"xmlns:mvc="http://www.springframework.org/schema/mvc"     xmlns:context="http://www.springframework.org/schema/context"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd"><!--开启注解扫描--><context:component-scan base-package="cn.lut"></context:component-scan><!--视图的解析器--><bean id="internalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"><property name="prefix" value="/WEB-INF/pages/"/><property name="suffix" value=".jsp"/></bean><!--配置自定义的类型转换器--><bean id="conversionService" class="org.springframework.context.support.ConversionServiceFactoryBean"><property name="converters"><set><bean class="cn.lut.utils.StringToDateConverter"></bean></set></property></bean><!--开启注解springMVC的支持--><mvc:annotation-driven conversion-service="conversionService"/>
</beans>

5.编写jsp页面
①首先在pages下新建success.jsp用于成功页面的显示

<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
<html>
<head><title>Success</title>
</head>
<body>
<h3>成功跳转</h3>
${msg}
${sessionScope}
</body>
</html>

②index.jsp中的代码如下：

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head><title>Title</title>
</head>
<body>
<h3>入门程序</h3>
<%--<a href="hello">入门程序</a>--%>
<a href="user/testRequestMapping">RequestMapping注解</a>
</body>
</html>

③anno.jsp中的代码如下：

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head><title>Title</title>
</head>
<body>
<%--常用的注解--%>
<a href="anno/testRequestParam?name=He">RequestParam</a>
<form action="anno/testRequestBody" method="post">name:<input type="text" name="username"/><br/>Age:<input type="text" name="age"/><br/><input type="submit" value="提交"/>
</form>
<a href="anno/testPathVariable/10">testPathVariable</a><br/>
<a href="anno/testRequestHeader">testRequestHeader</a><br/>
<a href="anno/testCookieValue">testCookieValue</a><br/>
<form action="anno/testModelAttribute" method="post">name:<input type="text" name="uname"/><br/>Age:<input type="text" name="age"/><br/><input type="submit" value="提交"/>
</form>
<a href="anno/testSessionAttributes">testSessionAttributes</a><br/>
<a href="anno/getSessionAttributes">getSessionAttributes</a><br/>
<a href="anno/delSessionAttributes">delSessionAttributes</a><br/>
</body>
</html>

④param.jsp中的代码如下：

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head><title>Title</title>
</head>
<body>
<%--请求参数绑定--%>
<%--<a href="param/testParam?username=hehe">请求参数绑定</a>--%>
<%--把数据封装在Account类中
<form action="param/saveAccount" method="post">username:<input type="text" name="username"/><br/>password:<input type="text" name="password"/><br/>money:<input type="text" name="money"/><br/>&lt;%&ndash; Uname:<input type="text" name="user.uname"/><br/>UAge:<input type="text" name="user.age"/><br/>&ndash;%&gt;<input type="submit" value="提交"/>--%><%--把数据封装在Account类中，类中存在list和map集合--%>
<%--<form action="param/saveAccount" method="post">username:<input type="text" name="username"/><br/>password:<input type="text" name="password"/><br/>money:<input type="text" name="money"/><br/>Uname:<input type="text" name="list[0].uname"/><br/>UAge:<input type="text" name="list[0].age"/><br/>Uname:<input type="text" name="map['one'].uname"/><br/>UAge:<input type="text" name="map['one'].age"/><br/><input type="submit" value="提交"/>--%>
<%--<form action="param/saveUser" method="post">&lt;%&ndash;自定义类型转换器&ndash;%&gt;Uname:<input type="text" name="uname"/><br/>UAge:<input type="text" name="age"/><br/>UBorn:<input type="text" name="date"/><br/><input type="submit" value="提交"/>
</form>--%>
<a href="param/saveServlet">Servlet原生的API</a>
</body>
</html>

至此运行tomcat服务器就可以成功运行了。