我是Spring Web MVC的新手,我尝试尝试Hello world app。
我跟随了一个例子来自" Spring In Action 4th ed"本书只使用java配置(没有任何XML文件)。我使用Tomcat v7.0服务器和servlet 3。
问题是当我尝试进入主页时遇到Http 404错误。
使用过的Java类是:
DispatcherServlet配置:
package config;
import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;
public class FirstWebAppInitializer extends AbstractAnnotationConfigDispatcherServletInitializer{
@Override
protected String[] getServletMappings() {
return new String[] { "/" };
}
@Override
protected Class<?>[] getRootConfigClasses() {
return new Class<?>[] { RootConfig.class };
}
@Override
protected Class<?>[] getServletConfigClasses() {
return new Class<?>[] { WebConfig.class };
}
}
Spring MVC配置:
package 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("web")
public class WebConfig extends WebMvcConfigurerAdapter {
@Bean
public ViewResolver viewResolver() {
InternalResourceViewResolver resolver = new InternalResourceViewResolver();
resolver.setPrefix("/WEB-INF/views/");
resolver.setSuffix(".jsp");
resolver.setExposeContextBeansAsAttributes(true);
return resolver;
}
@Override
public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
configurer.enable();
}
}
用于获取其他Beans的配置(在hello world应用程序中没有做任何事情)
package config;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.ComponentScan.Filter;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.FilterType;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
@Configuration
@ComponentScan(basePackages={"lgmi_cr"},excludeFilters={@Filter(type=FilterType.ANNOTATION, value=EnableWebMvc.class)})
public class RootConfig {
}
主页控制器
package web;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
public class HomeController {
@RequestMapping(value="/")
public String home() {
return "home";
}
}
一个JSP文件&#34; home&#34; uneder / WEB-INF / views /
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>First app</title>
</head>
<body>
<h1>Hello world</h1>
</body>
</html>
由于404错误,我的第一印象是它找不到任何控制器,但我不知道为什么。
感谢您的帮助
答案 0 :(得分:0)
我刚刚发现了这个问题。
实际上,我将外部Spring jar文件添加到项目类路径中,我忘记将它们添加到myProject / WebContent / WEB-INF / lib。