springMVC入门配置及helloworld实例

1. 新建web project

2. 往lib里copy必须的jar

3. 改写web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0"
	xmlns="http://java.sun.com/xml/ns/javaee"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
	http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
  <display-name></display-name>
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>

  <servlet>
  	<servlet-name>springMVC</servlet-name>
  	<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

  	<load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
  	<servlet-name>springMVC</servlet-name>
  	<url-pattern>/</url-pattern>
  </servlet-mapping>

</web-app>

4. 在WEB-INF下新建 springMVC-servlet.xml

value="/WEB-INF/", 如果这样设置, 那么jsp文件都要放在这个目录下 WEB-INF

<?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:p="http://www.springframework.org/schema/p"
    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-3.0.xsd
           http://www.springframework.org/schema/context
           http://www.springframework.org/schema/context/spring-context-3.0.xsd
           http://www.springframework.org/schema/mvc
           http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd"> 

    <!-- ViewResolver 视图解析器 -->
    <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/"/>
        <property name="suffix" value=".jsp"/>
    </bean>

</beans>

　　

5. src下新建package: com.tgb.web.controller   class:  HelloWorldController.java　

package com.tgb.web.controller;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.stereotype.Controller;
import org.springframework.web.servlet.ModelAndView;

public class HelloWorldController implements org.springframework.web.servlet.mvc.Controller{

	@Override
	public ModelAndView handleRequest(HttpServletRequest arg0, HttpServletResponse arg1) throws Exception {
		System.out.println("---hello wly--------");
		return new ModelAndView("/welcome");
	}
}

6. 新建welcome.jsp, 在WEB-INF下

7. 修改配置 文件 springMVC-servlet.xml

<bean name="/test1/helloworld" class="com.tgb.web.controller.HelloWorldController"></bean>

　　

8. IE测试:  http://localhost:8080/springMVC1/test1/helloworld

• 如果想把配置文件springMVC-servlet.xml放在config文件夹下并改名的话, 需要更改web.xml配置

 <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*:config/spring-servlet.xml</param-value>
  	</init-param>
  	<load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
  	<servlet-name>springMVC</servlet-name>
  	<url-pattern>/</url-pattern>
  </servlet-mapping>

• 传递参数:

在java文件里

package com.tgb.web.controller;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.servlet.ModelAndView;
public class HelloWorldController implements org.springframework.web.servlet.mvc.Controller{
	@Override
	public ModelAndView handleRequest(HttpServletRequest arg0, HttpServletResponse arg1) throws Exception {
		System.out.println("---hello wly--------");
		String hello = "吴丽颖 hello" ;
		Map<String, Object> map= new HashMap<String,Object>();
		map.put("map1", "提高班1");
		map.put("map2", "提高班2");
		map.put("map3", "提高班3");
		return new ModelAndView("/welcome","map",map);
		//return new ModelAndView("/welcome","result",hello);
	}
}

jsp里取值:

 EL表达式取值<br>
    ${map["map1"]} <br/>
    ${map["map2"]} <br/>
    ${map["map3"]} <br/>

 jstl取值map<br>
    <c:forEach var="m" items="${map}">
	${m.key} --- ${m.value} <br>
　　 </c:forEach>

• 多个方法如何使用

1. 创建一个MultiController类

package com.tgb.web.controller;

import java.util.HashMap;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.multiaction.MultiActionController;

public class MultiController extends MultiActionController{
	public ModelAndView add(HttpServletRequest request, HttpServletResponse response){
		System.out.println("-add-");
		return new ModelAndView("/multi","method","add");
	}
	public ModelAndView update(HttpServletRequest request, HttpServletResponse response){
		System.out.println("-update-");
		return new ModelAndView("/multi","method","update");
	}
}

　　

2. 改spring-servlet.xml

　 1.  引入paramMethodResolver   2. controller类调用

<?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:p="http://www.springframework.org/schema/p"
    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-3.0.xsd
           http://www.springframework.org/schema/context
           http://www.springframework.org/schema/context/spring-context-3.0.xsd
           http://www.springframework.org/schema/mvc
           http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd"> 

    <bean name="/test1/helloworld" class="com.tgb.web.controller.HelloWorldController"></bean>
    <bean name="/test1/multi" class="com.tgb.web.controller.MultiController">
    	<property name="methodNameResolver">
    		<ref bean="paramMethodResolver"/>
    	</property>
    </bean>

    <bean id="paramMethodResolver" class="org.springframework.web.servlet.mvc.multiaction.ParameterMethodNameResolver">
    	<property name="paramName" value="action"></property>
    </bean>

    <!-- ViewResolver 视图解析器 -->
    <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/"/>
        <property name="suffix" value=".jsp"/>
    </bean>

</beans>

　　

3. 访问时: http://localhost:8080/springMVC1/test1/multi?action=update