【SSM整合】如何快速构建一个SSM项目②

四、spring整合springMVC

1、配置web.xml

  • 全局配置
 <!--全局配置,加载spring配置文件-->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath*:applicationContext.xml</param-value>
    </context-param>
  • 配置监听器
 <!--配置监听器,web启动就开始读取配置-->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
  • 配置前端控制器
    <servlet>
        <servlet-name>springmvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath*:springmvc.xml</param-value>
        </init-param>
    </servlet>
 <!--配置为rest风格-->
    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
  • 配置过滤器
    <filter>
        <filter-name>CharsetFilter</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>CharsetFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">
    <!--全局配置,加载spring配置文件-->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath*:applicationContext.xml</param-value>
    </context-param>
    <!--配置监听器,web启动就开始读取配置-->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    <!--1. 配置前端控制器-->
    <servlet>
        <servlet-name>springmvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath*:springmvc.xml</param-value>
        </init-param>
    </servlet>
    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
    <!--2. 过滤编码-->
    <filter>
        <filter-name>CharsetFilter</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>CharsetFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
</web-app>

2、设计表示(controller)层,添加@RestController注解

  • 其他注解功能
注解名称功能
@RequestMapping配置 Web 请求的映射
@RequestParam接收前端传递给后端的普通类型数据
@RequestBody接收前端传递给后端的json中的数据
@PathVariable绑定占位符参数到方法参数中
注解说明
package com.godgy.controller;

import com.godgy.pojo.Book;
import com.godgy.service.BookService;
import com.godgy.utils.PageResult;
import com.godgy.utils.Result;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

/**
 * @author : Mr.Godgy
 * @version : 1.0
 * @date : 2022/8/13
 * @description:
 */

@RestController
//要配置 Web 请求的映射
@RequestMapping("/book")
public class BookController {

    private BookService bookService;

    @Autowired
    public void setBookService(BookService bookService) {
        this.bookService = bookService;
    }

    @RequestMapping("/findByPage")
    public PageResult<Book> findByPage(@RequestParam(defaultValue = "1") int page,
                                       @RequestParam(defaultValue = "2") int size){
        return  bookService.findByPage(page,size);
    }

    @RequestMapping("/findById/{bid}")
    public Result findById(@PathVariable Integer bid){
        Book book = bookService.findById(bid);
        if (book == null){
            return new Result(500,"获取失败");
        }
        else {
            return new Result(200,"成功获取",book);
        }
    }

    @RequestMapping("/update")
    public Result update(@RequestBody Book book){
        System.out.println(book);
        return new Result(200,"ok");
    }
}

3、配置springmvc

  • 配置扫描controller
    <context:component-scan base-package="com.godgy">
 <!--配置只扫描controller-->
        <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>
  • 扫描注解
    <mvc:annotation-driven/>
  • 配置静态资源处理方式

设置Web服务器默认的Servlet处理静态资源,而不是DispatcherServlet处理

    <mvc:default-servlet-handler/>
<?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.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <!--配置扫描controller-->
    <context:component-scan base-package="com.godgy">
        <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>

    <!--扫描注解-->
    <mvc:annotation-driven/>

    <!--不处理静态资源-->
    <mvc:default-servlet-handler/>
</beans>

4、测试请求

  • 开启Tomcat服务器

在maven的tomcat插件中,启动服务器

图片[1]-【SSM整合】如何快速构建一个SSM项目②-梦境学习站
开启Tomcat服务器
  • 测试post请求

使用apifox或postman等软件发送请求

图片[2]-【SSM整合】如何快速构建一个SSM项目②-梦境学习站

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