时间：2020-12-10 08:35:20 | 栏目：JAVA代码 | 点击：次
1. 新建 SpringMVC 的 Web 项目
2. 代码编写
代码参考 《Spring 实战》（第四版）,本文和书中代码略有差异
删除不需要的配置文件
编写 JavaConfig 文件
package com.yangrd.springmvc.config;
import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;
public class HelloWebAppInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {
@Override
protected Class<?>[] getRootConfigClasses() {
System.out.println("getRootConfig");
return new Class<?>[]{RootConfig.class};
}
@Override
protected Class<?>[] getServletConfigClasses() {
System.out.println("getServletConfig");
return new Class<?> []{WebConfig.class};
}
@Override
protected String[] getServletMappings() {
System.out.println("getServletMappings");
return new String[]{"/"};
}
}
新建配置文件 RootConfig.java
package com.yangrd.springmvc.config;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.FilterType;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
@Configuration
@ComponentScan(basePackages = {"com.yangrd.springmvc"},
excludeFilters = {@ComponentScan.Filter(type= FilterType.ANNOTATION,value = EnableWebMvc.class)})
public class RootConfig {
}
新建配置文件 WebConfig.java
package com.yangrd.springmvc.config;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.ViewResolver;
import org.springframework.web.servlet.config.annotation.DefaultServletHandlerConfigurer;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
import org.springframework.web.servlet.view.InternalResourceViewResolver;
@Configuration
@EnableWebMvc
@ComponentScan("com.yangrd.springmvc.controller")
public class WebConfig extends WebMvcConfigurerAdapter {
@Bean
public ViewResolver viewResolver(){
InternalResourceViewResolver resolver = new InternalResourceViewResolver();
resolver.setPrefix("/WEB-INF/views/");
resolver.setSuffix(".html");
resolver.setExposeContextBeansAsAttributes(true);
return resolver;
}
@Override
public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer){
configurer.enable();
}
}
编写 Controller
package com.yangrd.springmvc.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import static org.springframework.web.bind.annotation.RequestMethod.GET;
/**
*
*/
@Controller //声明为一个控制器
public class HelloController {
@RequestMapping(value = "/home",method = GET)//处理对 “/” 的 GET 请求
public String hello(){
return "hello"; //逻辑视图名为hello
}
}
编写 view 文件
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Hello</title> </head> <body> hello world </body> </html>
3. Tomcat 的配置和启动
配置tomcat服务
将Sping MVC 相关包放到 Web 工程 中的 lib 下
启动tomcat
这是启动tomcat 会报错
Error:(5, 8) java: 无法访问javax.servlet.ServletException
找不到javax.servlet.ServletException的类文件
这时需要添加 javax.servlet-api
4. 测试
浏览器访问 http://localhost:8080/home
显示
hello world