SpringMVC 环境搭建

SpringMVC 环境搭建：

1、创建 webapp 的模型的 Maven 项目

2、在 Maven 文件中导入依赖

<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-webmvc</artifactId>
    <version>5.2.8.RELEASE</version>
</dependency>

<dependency>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok</artifactId>
    <version>1.18.12</version>
</dependency>

<dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>servlet-api</artifactId>
    <version>2.5</version>
</dependency>

3、在 web.xml 文件中配置前置处理器（DispatcherServlet），并且配置 springmvc.xml 文件

<servlet>
    <!-- servlet-name 名随便取 -->
    <servlet-name>dispatcherServlet</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <!-- init-param 加载 springmvc 配置文件 -->
    <init-param>
        <!-- param-name 名称固定 -->
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:springmvc.xml</param-value>
    </init-param>
</servlet>

<!-- servlet-mapping 前置控制器，处理路径 -->
<servlet-mapping>
    <servlet-name>dispatcherServlet</servlet-name>
    <url-pattern>/</url-pattern>
</servlet-mapping>

<!-- 配置后将不会拦截 js 文件 -->
<servlet-mapping>
    <servlet-name>default</servlet-name>
    <url-pattern>*.js</url-pattern>
</servlet-mapping>

4、创建 springmvc.xml 配置文件，配置视图解析器（ViewResolver），配置包扫描，消息转换器…

<?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-3.2.xsd">

    <mvc:annotation-driven>
        <!-- 消息转换器 -->
        <mvc:message-converters register-defaults="true">
            <bean class="org.springframework.http.converter.StringHttpMessageConverter">
                <property name="supportedMediaTypes" value="text/html;charset=UTF-8"></property>
            </bean>
        </mvc:message-converters>
    </mvc:annotation-driven>

    <context:component-scan base-package="com.cl"></context:component-scan>

    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/"></property>
        <property name="suffix" value=".jsp"></property>
    </bean>
</beans>

5、编写业务接口

@Controller
public class HelloHandler {
    
    
    
    @RequestMapping(value = "/index", method = RequestMethod.GET, params = {
    
    "name","id"})
    public String index(@RequestParam("name") String name,@RequestParam("id") int id){
    
    
        System.out.println("执行了 index 方法...");
        System.out.println("name:  "+name+"    id:   "+id);
        return "index";
    }

    // restful风格请求
    @RequestMapping(value = "/restful/{name}/{id}",method = RequestMethod.GET)
    public String indexRest(@PathVariable("name") String name,@PathVariable("id") int id){
    
    
        System.out.println("执行了 indexRest 方法...");
        System.out.println("name:  "+name+"    id:   "+id);
        return "index";
    }


    @RequestMapping("/json")
    public User json(@RequestBody User user, HttpServletResponse response){
    
    
        response.setCharacterEncoding("text/json;charset=UTF-8");
        System.out.println(user);
        user.setId(6L);
        user.setName("张六");
        return user;
    }
}

6、浏览器访问接口测试

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