java：Springmvc框架1（基本配置，注解配置，转换器引入）

2021-07-09 15:37:44

1.springmvc01:（基本配置）

　　web.xml:

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">

  <display-name>springmvc01</display-name>

  <welcome-file-list>

    <welcome-file>index.html</welcome-file>

    <welcome-file>index.htm</welcome-file>

    <welcome-file>index.jsp</welcome-file>

    <welcome-file>default.html</welcome-file>

    <welcome-file>default.htm</welcome-file>

    <welcome-file>default.jsp</welcome-file>

  </welcome-file-list>

  <!-- spring mvc的前端控制器,类似struts2的核心过滤器 -->

  <servlet>

      <servlet-name>springmvc</servlet-name>

      <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

      <!-- 通过contextConfigLocation参数指定配置文件的位置，默认在WEB-INF/查找名称为 [servlet-name]-servlet.xml -->

      <init-param>

          <param-name>contextConfigLocation</param-name>

          <param-value>classpath:springmvc.xml</param-value>

      </init-param>

      <!-- servlet随web容器而启动 -->

      <load-on-startup>1</load-on-startup>

  </servlet>

  <servlet-mapping>

      <servlet-name>springmvc</servlet-name>

      <url-pattern>*.action</url-pattern>

  </servlet-mapping>

</web-app>

　　springmvc.xml:

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"

       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-4.3.xsd">

    <!-- 处理器映射器 -->

    <!-- 根据bean的name进行查找Handler处理器 将请求的url配置在bean的name中 -->

    <!-- 这是一个默认的映射处理器,即使不配置，那么也是默认就是这个 -->

    <bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"></bean>

    <!-- HandlerAdapter适配器 -->

    <!--  注意：这个适配器不是必须配置的，这是默认的、他在servlet容器已启动就被加载-->

    <bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"/>

    <!-- 配置自定义Handler控制器 -->

    <!-- Handler后端控制器 -->

    <!-- 配置controller ,使用beanName:name="/hello.action"进行进行请求映射匹配-->

    <bean name="/hello.action" class="cn.zzsxt.controller.HelloController"></bean>

    <!-- 配置视图解析器 -->

    <!-- InternalResourceViewResolver：支持JSP视图解析 -->

    <!-- viewClass：JstlView表示JSP模板页面需要使用JSTL标签库，所以classpath中必须包含jstl的相关jar包； -->

    <!-- prefix 和suffix：查找视图页面的前缀和后缀，最终视图的址为： -->

    <!-- 前缀+逻辑视图名+后缀，逻辑视图名需要在controller中返回ModelAndView指定，比如逻辑视图名为hello，-->

    <!-- 则最终返回的jsp视图地址 "WEB-INF/view/hello.jsp" -->

    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">

        <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"></property>

        <property name="prefix" value="/WEB-INF/jsp/"></property>

        <property name="suffix" value=".jsp"></property>

    </bean>

</beans>

　　HelloController.java:

package cn.zzsxt.controller;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.ModelAndView;

import org.springframework.web.servlet.mvc.Controller;

/**

 * 后端控制器,类似与struts2的业务逻辑action

 * @author Think

 *

 */

public class HelloController implements Controller {

    /**

     * 处理用户请求的方法，类似struts2中action的execute方法

     */

    @Override

    public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception {

        //处理用户请求

        ModelAndView mv = new ModelAndView();

        mv.addObject("hello", "hello,spring mvc !");//request.setAttribute("hello","hello,spring mvc!");

//        mv.setViewName("/WEB-INF/jsp/hello.jsp");

        mv.setViewName("hello");//视图的逻辑名称

        return mv;

    }

}

　　index.jsp:

<%@ 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>

  <head>

    <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">

    -->

  </head>

  <body>

      <a href="hello.action">hello springmvc!</a>

  </body>

</html>

2.springmvc2:（注解配置）

　　springmvc.xml:

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"

       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

       xmlns:context="http://www.springframework.org/schema/context"

       xmlns:mvc="http://www.springframework.org/schema/mvc"

       xsi:schemaLocation="http://www.springframework.org/schema/beans

      http://www.springframework.org/schema/beans/spring-beans-4.3.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">

     <!-- 注解扫描!!!-->

      <context:component-scan base-package="cn.zzsxt.controller"></context:component-scan>

       <!-- 注解映射器

        说明 ：对类中标记@ResquestMapping的方法进行映射，根据ResquestMapping定义的url匹配

        ResquestMapping标记的方法，匹配成功返回HandlerMethod对象给前端控制器，HandlerMethod对象中封装url对应的方法Method

    -->

    <!--

    <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping"/>

    -->

    <!-- 注解适配器

         说明：注解式处理器适配器，对标记@ResquestMapping的方法进行适配。

    -->

    <!--

    <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter"/>

    -->

    <!-- springmvc使用<mvc:annotation-driven> -->

    <!-- 自动加载RequestMappingHandlerMapping和RequestMappingHandlerAdapter， -->

    <!-- 可用在springmvc.xml配置文件中使用<mvc:annotation-driven>替代注解处理器和适配器的配置。 -->

    <mvc:annotation-driven></mvc:annotation-driven>

    <!-- 配置视图解析器 -->

    <!-- InternalResourceViewResolver：支持JSP视图解析 -->

    <!-- viewClass：JstlView表示JSP模板页面需要使用JSTL标签库，所以classpath中必须包含jstl的相关jar包； -->

    <!-- prefix 和suffix：查找视图页面的前缀和后缀，最终视图的址为： -->

    <!-- 前缀+逻辑视图名+后缀，逻辑视图名需要在controller中返回ModelAndView指定，比如逻辑视图名为hello，-->

    <!-- 则最终返回的jsp视图地址 "WEB-INF/view/hello.jsp" -->

    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">

        <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"></property>

        <property name="prefix" value="/WEB-INF/jsp/"></property>

        <property name="suffix" value=".jsp"></property>

    </bean>

</beans>

　　web.xml:

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">

  <display-name>springmvc01</display-name>

  <welcome-file-list>

    <welcome-file>index.html</welcome-file>

    <welcome-file>index.htm</welcome-file>

    <welcome-file>index.jsp</welcome-file>

    <welcome-file>default.html</welcome-file>

    <welcome-file>default.htm</welcome-file>

    <welcome-file>default.jsp</welcome-file>

  </welcome-file-list>

  <!-- spring mvc的前端控制器,类似struts2的核心过滤器 -->

  <servlet>

      <servlet-name>springmvc</servlet-name>

      <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

      <!-- 通过contextConfigLocation参数指定配置文件的位置，默认在WEB-INF/查找名称为 [servlet-name]-servlet.xml -->

      <init-param>

          <param-name>contextConfigLocation</param-name>

          <param-value>classpath:springmvc.xml</param-value>

      </init-param>

      <!-- servlet随web容器而启动 -->

      <load-on-startup>1</load-on-startup>

  </servlet>

  <servlet-mapping>

      <servlet-name>springmvc</servlet-name>

      <url-pattern>*.action</url-pattern>

  </servlet-mapping>

</web-app>

　　HelloController.java:

package cn.zzsxt.controller;

import java.io.IOException;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestMethod;

import org.springframework.web.servlet.ModelAndView;

/**

 * @Controller:控制器

 * @RequestMapping:访问该处理器的映射路径。

 * 如果在类的上边添加该注解，类似struts2的包的命名空间(窄化路径)

 * 如果在业务方法的上方添加该注解，代表方法该方法对应的url

 *

 * /hello/aa.action--->aa()

 * /hello/bb.action--->bb()

 *

 *

 */

@Controller

@RequestMapping("/hello")

public class HelloController {

    //返回值为ModelAndView

    @RequestMapping(value="/aa",method=RequestMethod.GET)

    public ModelAndView aa(){

        ModelAndView mv = new ModelAndView();

        mv.addObject("hello","springmvc注解开发示例!");

        mv.setViewName("hello");

        return mv;

    }

    //返回值为void

    @RequestMapping("/bb")

    public void bb(HttpServletRequest request,HttpServletResponse response){

        request.setAttribute("hello", "返回值为void的controller方法!");

        try {

            request.getRequestDispatcher("/WEB-INF/jsp/hello.jsp").forward(request, response);

        } catch (ServletException e) {

            e.printStackTrace();

        } catch (IOException e) {

            e.printStackTrace();

        }

    }

    //返回值为String(逻辑视图名称),默认使用的请求转发

    @RequestMapping("/cc")

    public String cc(HttpServletRequest request){

        request.setAttribute("hello", "返回值为String的controller方法!");

        return "hello";//  /WEB-INF/jsp/hello.jsp

    }

    //重定向redirect:

    @RequestMapping("/dd")

    public String dd(HttpServletRequest request){

        request.setAttribute("hello", "返回值为String的controller方法!");

//        return "forward:hello";//如果请求转发到controller中的方法(类似与struts2的chain),需要在前面添加forward

        return "redirect:/WEB-INF/jsp/hello.jsp";//  /WEB-INF/jsp/hello.jsp

    }

}

3.springmvc03：（转换器引入，日期转换）

　　web.xml：

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">

  <display-name>springmvc01</display-name>

  <welcome-file-list>

    <welcome-file>index.html</welcome-file>

    <welcome-file>index.htm</welcome-file>

    <welcome-file>index.jsp</welcome-file>

    <welcome-file>default.html</welcome-file>

    <welcome-file>default.htm</welcome-file>

    <welcome-file>default.jsp</welcome-file>

  </welcome-file-list>

  <!-- spring mvc的前端控制器,类似struts2的核心过滤器 -->

  <servlet>

      <servlet-name>springmvc</servlet-name>

      <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

      <!-- 通过contextConfigLocation参数指定配置文件的位置，默认在WEB-INF/查找名称为 [servlet-name]-servlet.xml -->

      <init-param>

          <param-name>contextConfigLocation</param-name>

          <param-value>classpath:springmvc.xml</param-value>

      </init-param>

      <!-- servlet随web容器而启动 -->

      <load-on-startup>1</load-on-startup>

  </servlet>

  <servlet-mapping>

      <servlet-name>springmvc</servlet-name>

      <url-pattern>*.action</url-pattern>

  </servlet-mapping>

   <!-- 解决post提交乱码问题 -->

  <filter>

      <filter-name>encodingFilter</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>encodingFilter</filter-name>

      <url-pattern>/*</url-pattern>

  </filter-mapping>

</web-app>

　　springmvc.xml：

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"

       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

       xmlns:context="http://www.springframework.org/schema/context"

       xmlns:mvc="http://www.springframework.org/schema/mvc"

       xsi:schemaLocation="http://www.springframework.org/schema/beans

      http://www.springframework.org/schema/beans/spring-beans-4.3.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">

     <!-- 注解扫描!!!-->

      <context:component-scan base-package="cn.zzsxt.controller"></context:component-scan>

          <!-- 配置视图解析器 -->

    <!-- InternalResourceViewResolver：支持JSP视图解析 -->

    <!-- viewClass：JstlView表示JSP模板页面需要使用JSTL标签库，所以classpath中必须包含jstl的相关jar包； -->

    <!-- prefix 和suffix：查找视图页面的前缀和后缀，最终视图的址为： -->

    <!-- 前缀+逻辑视图名+后缀，逻辑视图名需要在controller中返回ModelAndView指定，比如逻辑视图名为hello，-->

    <!-- 则最终返回的jsp视图地址 "WEB-INF/view/hello.jsp" -->

    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">

        <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"></property>

        <property name="prefix" value="/WEB-INF/jsp/"></property>

        <property name="suffix" value=".jsp"></property>

    </bean>

       <!-- 注解映射器

        说明 ：对类中标记@ResquestMapping的方法进行映射，根据ResquestMapping定义的url匹配

        ResquestMapping标记的方法，匹配成功返回HandlerMethod对象给前端控制器，HandlerMethod对象中封装url对应的方法Method

    -->

    <!--

    <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping"/>

    -->

    <!-- 注解适配器

         说明：注解式处理器适配器，对标记@ResquestMapping的方法进行适配。

    -->

    <!--

    <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter"/>

    -->

    <!-- springmvc使用<mvc:annotation-driven> -->

    <!-- 自动加载RequestMappingHandlerMapping和RequestMappingHandlerAdapter， -->

    <!-- 可用在springmvc.xml配置文件中使用<mvc:annotation-driven>替代注解处理器和适配器的配置。 -->

    <mvc:annotation-driven conversion-service="conversionService"></mvc:annotation-driven>

    <!-- 自定义类型转换器 -->

    <bean id="conversionService" class="org.springframework.format.support.FormattingConversionServiceFactoryBean">

        <property name="converters">

            <list>

                <bean class="cn.zzsxt.converter.CustomDateConverter"></bean>

            </list>

        </property>

    </bean>

</beans>

　　UserController.java：

package cn.zzsxt.controller;

import org.springframework.stereotype.Controller;

import org.springframework.ui.Model;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestMethod;

import cn.zzsxt.entity.Userinfo;

/**

 * 约定大于配置

 * @author Think

 *

 */

@Controller

@RequestMapping("/user")

public class UserController {

    //根据用户请求访问/WEB-INF/jsp/register.jsp

    @RequestMapping(value="/register",method=RequestMethod.GET)

    public String register(){

        return "register";

    }

    @RequestMapping(value="/register2",method=RequestMethod.GET)

    public String register2(){

        return "register2";

    }

    //@RequestParam(name="uname")：参数绑定的注解,通过该注解可以解决参数名称与controller中形参名称不一致的问题。

//    @RequestMapping(value="/register",method=RequestMethod.POST)

//    public String register(@RequestParam(name="userName",required=true) String uname,@RequestParam(name="userPass") String upass,Model model){

//        System.out.println("执行了用户注册，用户名:"+uname+",密码:"+upass);

//        model.addAttribute("userName", uname);//request.setAttribute("userName",uname);

//        return "success";

//    }

    @RequestMapping(value="/register",method=RequestMethod.POST)

    public String register(String userName,String userPass,Model model){

        System.out.println("执行了用户注册，用户名:"+userName+",密码:"+userPass);

        model.addAttribute("userName", userName);//request.setAttribute("userName",userName);

        return "success";

    }

    @RequestMapping(value="/register2",method=RequestMethod.POST)

    public String register2(Userinfo user,Model model){

        System.out.println("执行了用户注册2，用户名:"+user.getUserName()+",密码:"+user.getUserPass()+",生日:"+user.getBirthDay());

        model.addAttribute("user", user);//request.setAttribute("userName",userName);

        return "success2";

    }

}

　　CustomDateConverter.java：

package cn.zzsxt.converter;

import java.text.ParseException;

import java.text.SimpleDateFormat;

import java.util.Date;

import org.springframework.core.convert.converter.Converter;

/**

 * 自定义类型转换器

 * @author Think

 *

 */

public class CustomDateConverter implements Converter<String, Date> {

    @Override

    public Date convert(String source) {

        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

        try {

            Date date = sdf.parse(source);

            return date;

        } catch (ParseException e) {

            e.printStackTrace();

        }

        return null;

    }

}

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