SpringMVC如何往前台传递参数
1、下载这些jar包，或者使用maven配置这些依赖。
2、项目文件夹结构如下
3、RootConfig类
package web.config;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.context.annotation.FilterType;
@Configuration
@ComponentScan(basePackages = { "web" }, excludeFilters = {
@ComponentScan.Filter(type = FilterType.ANNOTATION, value = EnableWebMvc.class) })
public class RootConfig {
}
4、SpringWebAppInitializer类
package web.config;
import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;
public class SpringWebAppInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {
protected Class<?>[] getRootConfigClasses() {
return new Class<?>[] { RootConfig.class };
}
// 指定配置类，即javaConfig
protected Class<?>[] getServletConfigClasses() {
return new Class<?>[] { WebConfig.class };
}
protected String[] getServletMappings() {
return new String[] { "/" };
}
}
5、WebConfig类
package web.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
// 启用注解驱动的spring mvc
@EnableWebMvc
@ComponentScan(basePackages = { "web.controller" })
public class WebConfig extends WebMvcConfigurerAdapter {
@Bean
public ViewResolver viewResolver() {
InternalResourceViewResolver internalResourceViewResolver = new InternalResourceViewResolver();
internalResourceViewResolver.setViewClass(org.springframework.web.servlet.view.JstlView.class);
internalResourceViewResolver.setPrefix("/WEB-INF/views/");
internalResourceViewResolver.setSuffix(".jsp");
internalResourceViewResolver.setExposeContextBeansAsAttributes(true);
return internalResourceViewResolver;
}
// 处理静态资源的时候，将请求转发到Servlet容器中默认的Servlet上
@Override
public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
configurer.enable();
super.configureDefaultServletHandling(configurer);
}
}
1、package web.controller;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
@Controller
public class HomeController {
@Autowired
private HttpSession session;
@Autowired
private HttpServletRequest request;
@RequestMapping(value = "home", method = RequestMethod.GET)
public String home() {
session.setAttribute("a", 1);
request.setAttribute("b", 2);
return "home";
}
}
1、package web.controller;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
@Controller
public class HomeController {
@RequestMapping(value = "home", method = RequestMethod.GET)
public String home(HttpSession session,HttpServletRequest request) {
session.setAttribute("a", 1);
request.setAttribute("b", 2);
return "home";
}
}
1、home.jsp内容:
<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title></title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
</head>
<body>
<%=session.getAttribute("a") %>
<%=request.getAttribute("b") %>
</body>
</html>
1、可以看到
setAttribute发生了作用。
