springMvc(初识+操作步骤)

1.导入包
2.配置web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
<servlet>
<servlet-name>springmvc</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
</servlet>

<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
</web-app>
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3.创建springmvc的核心配置文件
文件的命名规则：中央控制器（servlet的名称）的名称+“-servlet.xml”
默认位置：WEB-INF下

springmvc的头信息

<?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:mvc="http://www.springframework.org/schema/mvc"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-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/aop
http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.0.xsd ">
</beans>
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4.写controller

@controller:标识当前类是控制层的一个具体的实现
@requestMapping：放在方法上面用来指定某个方法的路径，当它放在类上的时候相当于命名空间需要组合方法上的requestmapping来访问。

@Controller
@RequestMapping("/test")
public class TestController {

@RequestMapping("/hello.do")
public String hello() {

return "index";
}

@RequestMapping("/reparam.do")
public String reparam(HttpServletRequest req) {
String name=req.getParameter("name");
System.out.println(name);
return "index";
}

/*
* 底层走的就是HttpServletRequest
*/
@RequestMapping("/re2.do")
public String re2(String name) {

System.out.println(name);
return "index";

}

@RequestMapping("/re3.do")
public String re3(String name,Integer id,Date bir) {

System.out.println(name+" "+id+" "+bir);
return "index";

}

@InitBinder
public void initBind(ServletRequestDataBinder binder) {

binder.registerCustomEditor(Date.class, new CustomDateEditor(
new SimpleDateFormat("yyyy-MM-dd"), true));
}

@RequestMapping("/toform.do")
public String toform() {

return "form";
}

@RequestMapping("/form.do")
public String form(String[] favor) {

for(String fa :favor)
System.out.println(fa);

return "index";
}

@RequestMapping("/toperson.do")
public String toperson(Person person) {

System.out.println(person);
return "success";
}

//参数map是往页面写的
@RequestMapping("/getP.do")
public String getP(Map<String, Object> map) {
Person p1=new Person(2, "lisi", "bj", 2, new Date());
map.put("person", p1);
return "returnPage";
}

//最常用的
@RequestMapping("/getM.do")
public String getM(Model model) {
Person p1=new Person(2, "lisi", "bj", 2, new Date());
model.addAttribute("person", p1);
return "returnPage";
}
}
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1.在方法中可以自己随意去定义方法的参数，如果方法的参数的名称与传入参数的name匹配就会自动接收，别且转换我们所定义的数据类型。如果参数列表里定义了自定义的类springmvc会给我们把匹配的参数手机起来并且组装成对象。
2. requestMapping里面的method的类型必须要与前台form的类型一致

//-------------------------------------------------------------------------------------------------------

5.视图解析器（写在3的<beans></beans>里面）

<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/jsp/"> </property>
<property name="suffix" value=".jsp"></property>
</bean>
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6.在springmvc的配置文件中指定注解驱动，配置扫描器
（有扫描器就不用开启驱动了）

<context:component-scan base-package="com.rl.controller"></context:component-scan>