I. Basic operation

How to respond to requests

1. ModelAndView mode

/**
 *Annotation based custom Controller
 * @author Administrator
 *
 */
@Controller
@RequestMapping("/hello")
//  http: /.. / project name / hello
public class SpringController {
	
	
	/**
	 * Server response page
	 *    ModelAndView
	 * @return
	 */
	@RequestMapping("/h1")
	public ModelAndView hello1(){
		System.out.println("---Spring1----");
		ModelAndView m=new ModelAndView();
		// Add '/' to indicate absolute road strength and not to indicate relative path
		m.setViewName("/index.jsp");
		return m;
	}
}

2. The server does not respond to the result to the client

/**
	 * The server does not respond to the result to the client
	 *   void+@ResponseBody
	 * @return
	 */
	@RequestMapping("/f1")
	@ResponseBody
	public void fun1(){
		System.out.println("---f1----");
	}

Returns a string

/**
	 * Server response string to client
	 *   
	 * @return
	 */
	@RequestMapping("/f2")
	@ResponseBody
	public String fun2(){
		System.out.println("---f2----");
		return "String";
	}

4. Return to a page

Absolute path

/**
	 * Server responds to a page absolute path
	 *   
	 * @return
	 */
	@RequestMapping("/f3")
	public String fun3(){
		System.out.println("---f3----");
		return "/index.jsp";
	}

Relative path

/**
	 * Server responds to a page relative path
	 *   
	 * @return
	 */
	@RequestMapping("/f4")
	public String fun4(){
		System.out.println("---f4----");
		return "index.jsp";
	}

404 the error reporting relative path is the index.jsp file in the hello folder

5. Prefix and suffix

Member variables in the view parser

Configure view resolver

<?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/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd
		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-4.3.xsd">
	<!-- Open scan -->
	<context:component-scan base-package="com.sxt.controller"/>
	
	<!-- open SpringMVC How to annotate -->
	<mvc:annotation-driven></mvc:annotation-driven>		
	 <!-- Configure view resolver address -->	
	 <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
	 	<!-- Suffix before configuration -->
	 	<property name="prefix" value="/" />
	 	<property name="suffix" value=".jsp" />
	 </bean>	
</beans>

Redirect (add a redirect)

@RequestMapping("/f5")
	public String fun5(){
		System.out.println("---f5----");
		//The default is server-side adjustment. If you need to redirect, add the prefix redirect:
		return "redirect:/index.jsp";
	}

HttpServletRequest and HttpServletResponse

	/**
	 * Traditional way
	 * @param req
	 * @param response
	 * @throws ServletException
	 * @throws IOException
	 */
	@RequestMapping("/f6")
	public void fun6(HttpServletRequest req,HttpServletResponse response) throws ServletException, IOException{
		System.out.println("-----f6--------");
		req.getRequestDispatcher("/index.jsp").forward(req, response);
		
	}