兩種方式創建ssm項目
第一種方式,基於xml
創建一個maven項目,點擊項目名右鍵選擇打開模塊設置或者按F4,創建Webapp目錄,並且在其下面創建WEB-INF文件夾以及其下面的web.xml文件
在resources文件夾中創建spring的配置文件
<?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"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">
<context:component-scan base-package="cn.itxiaoliu" use-default-filters="true">
<context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
</context:component-scan>
</beans>
在resources文件夾中創建springmvc的配置文件
<?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 https://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/cache http://www.springframework.org/schema/cache/spring-cache.xsd">
<context:component-scan base-package="cn.itxiaoliu" use-default-filters="false">
<context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
</context:component-scan>
<mvc:annotation-driven/>
</beans>
在java文件夾下創建cn.itxiaoliu.controller文件夾以及cn.itxiaoliu.service文件夾
在controller包下創建HelloController.java文件
package cn.itxiaoliu.controller;
import cn.itxiaoliu.service.HelloService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class HelloController {
@Autowired
HelloService helloService;
@GetMapping("/hello")
public String hello(){
return helloService.sayHello();
}
}
在service包下創建HelloService.java文件
package cn.itxiaoliu.service;
import org.springframework.stereotype.Service;
@Service
public class HelloService {
public String sayHello(){
return "hello java極客技術";
}
}
在web.xml中做如下配置
<?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">
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:applicationContext.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<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:spring-servlet.xml</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
配置好本地tomcat便可訪問
pom.xml文件中只要加入spring-webmvc配置即可
第二種方式,基於純註解
純註解需要在java文件夾下創建不止cn.itxiaoliu.controller和cn.itxiaoliu.service,還有cn.itxiaoliu.config以及cn.itxiaoliu.interceptor
在config包下創建SpringConfig.java相當於spring的xml文件
package cn.itxiaoliu.config;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.FilterType;
import org.springframework.stereotype.Controller;
@Configuration
@ComponentScan(basePackages = "cn.itxiaoliu",useDefaultFilters = true,
excludeFilters = {@ComponentScan.Filter(type = FilterType.ANNOTATION,classes = Controller.class)})
public class SpringConfig {
}
創建SpringMVCConfig.java相當於springmvc的xml文件
package cn.itxiaoliu.config;
import cn.itxiaoliu.interceptor.MyInterceptor;
import com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.FilterType;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.stereotype.Controller;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;
import java.util.List;
@Configuration
@ComponentScan(basePackages = "cn.itxiaoliu",useDefaultFilters = false,
includeFilters = {@ComponentScan.Filter(type = FilterType.ANNOTATION,classes = Controller.class),
@ComponentScan.Filter(type = FilterType.ANNOTATION,classes = Configuration.class)})
public class SpringMVCConfig extends WebMvcConfigurationSupport {
@Override
protected void addResourceHandlers(ResourceHandlerRegistry registry) {
registry.addResourceHandler("/static/**").addResourceLocations("classpath:/static/");
}
@Override
protected void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor(myInterceptor()).addPathPatterns("/**");
}
@Bean
MyInterceptor myInterceptor(){
return new MyInterceptor();
}
@Override
protected void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
FastJsonHttpMessageConverter e=new FastJsonHttpMessageConverter();
converters.add(e);
}
}
創建WebInt.java相當於web.xml文件
package cn.itxiaoliu.config;
import org.springframework.web.WebApplicationInitializer;
import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;
import org.springframework.web.servlet.DispatcherServlet;
import javax.servlet.ServletException;
import javax.servlet.ServletRegistration;
public class WebInt implements WebApplicationInitializer {
public void onStartup(javax.servlet.ServletContext servletContext) throws ServletException {
AnnotationConfigWebApplicationContext ctx = new AnnotationConfigWebApplicationContext();
ctx.setServletContext(servletContext);
ctx.register(SpringMVCConfig.class);
ServletRegistration.Dynamic springmvc = servletContext.addServlet("springmvc", new DispatcherServlet(ctx));
springmvc.addMapping("/");
springmvc.setLoadOnStartup(1);
}
}
在controller包下創建HelloController.java
package cn.itxiaoliu.controller;
import cn.itxiaoliu.service.HelloService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.ArrayList;
import java.util.List;
@RestController
public class HelloController {
@Autowired
HelloService helloService;
@GetMapping("/hello")
public String hello(){
return helloService.sayHello();
}
@GetMapping("/data")
public List<String> getData(){
ArrayList<String> list = new ArrayList<String>();
for (int i = 0; i <10 ; i++) {
list.add("www.justdojava.com>>>"+i);
}
return list;
}
}
在service包下創建HelloService.java
package cn.itxiaoliu.service;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
@Service
public class HelloService {
public String sayHello(){
return "hello javassm!";
}
}
在interceptor包下創建MyInterceptor.java
package cn.itxiaoliu.interceptor;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class MyInterceptor implements HandlerInterceptor {
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
System.out.println("preHandle");
return true;
}
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
System.out.println("postHandle");
}
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
System.out.println("afterCompletion");
}
}
pom.xml中加入以下配置
<packaging>war</packaging>
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.0.2.RELEASE</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>4.0.1</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.1.37</version>
</dependency>
</dependencies>