springMVC框架开发笔记 lesson2 注解开发

SpringMVC注解开发:

实现一个Handler处理多个请求

@Controller

@RequestMapping(value="url",method=RequestMethod.GET/POST)

@RequestParam : 当提交请求参数名和方法形参不一致时候使用

注解开发后 方法的返回值:

a.ModelAndView

需要在方法中定义ModelAndView.

往对象中添加模型数据和视图.

b.String

b.1 返回页面 return "addSuccess"; 跳转到jsp

b.2 重定向 return "redirect:list.action";

b.3 转发 return "forward:/list.action";

c.void 空返回

方法的参数绑定:

a.基本类型+String eg: list(String name);

b.对象类型 eg: add(User u);
c.request,response,session,Model(底层就是Map)

SpringMVC注解编程

handle类

@Controller //标识控制器

public class UserHandler {

String account;

//@RequestMapping: 标识url 方法映射

@RequestMapping(value="list.action",method={RequestMethod.GET,RequestMethod.POST})

public ModelAndView list(String name,String sex){

ModelAndView mav = new ModelAndView();

User a;

List<Users> list = new ArrayList<Users>();

list.add(new Users(1,"admin","admin@163.com","22"));

list.add(new Users(2,"common","common@163.com","21"));

mav.addObject("list", list);

mav.addObject("n", name);

mav.addObject("s", sex);

mav.setViewName("list");

return mav;

}

//用对象类型接受页面的多个值 封装成一个对象

//可以在自定义的方法 参数绑定:基本类型 String,对象,request,response,session,Model(底层就是一个Map结构)

//可以在自定义的方法 参数绑定:基本类型 String,对象,request,response,session,Model(底层就是一个Map结构)

//可以在自定义的方法 参数绑定:基本类型 String,对象,request,response,session,Model(底层就是一个Map结构)

@RequestMapping(value="add.action",method={RequestMethod.GET})

public Stringadd(Users u,HttpServletRequest request,HttpServletResponse response,HttpSession session,Model model) throws IOException{

System.out.println(u.getUsername()+":"+u.getAge());

model.addAttribute("aaa", "啊啊啊啊");

return "addSuccess";//跳转到页面

// return "redirect:list.action";

// return "forward:/list.action";

}

@RequestMapping(value="delete.action",method={RequestMethod.GET,RequestMethod.POST})

public void delete(String username,String email,String age,HttpServletRequest request,HttpServletResponse response,HttpSession session) throws Exception{

Users u = new Users(username,email,age);

request.setAttribute("u", u);

//重定向到 完整页面

//response.sendRedirect("/jsp/deleteSuccess.jsp");

request.getRequestDispatcher("/jsp/deleteSuccess.jsp").forward(request, response);

}

}

配置springmvc.xml

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"

xmlns:aop="http://www.springframework.org/schema/aop"

xmlns:context="http://www.springframework.org/schema/context"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-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/context http://www.springframework.org/schema/context/spring-context-3.0.xsd">
<!-- 启用注解扫描 -->

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

</context:component-scan>

<!-- 映射器

只能在注解开发的Handler使用此种映射器

-->

<!-- <bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping.class">

</bean> -->

<!-- 适配器

只能在注解开发的Handler 使用

-->

<!-- <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">

</bean> -->

<!-- 映射器和适配器在Dispatcher.propertice里已经提供，所有不用配置-->

<!-- 配置视图解析器 -->

<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">

<property name="prefix" value="/jsp/"></property>

<property name="suffix" value=".jsp"></property>

</bean>

</beans>

配置web.xml

<!-- 配置springmvc的前端控制器 -->

<servlet>

<servlet-name>springmvc1</servlet-name>

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

<init-param>

<param-name>contextConfigLocation</param-name>

<param-value>classpath:springmvc.xml</param-value>

</init-param>

</servlet>

<servlet-mapping>

<servlet-name>springmvc1</servlet-name>

<url-pattern>*.action</url-pattern>

</servlet-mapping