springmvc的注解式开发

1 简写前后缀 

public class Frist implements Controller {
    public ModelAndView handleRequest(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) throws Exception {
        ModelAndView mx=new  ModelAndView();
        mx.setViewName("index");
        return mx;
    }
}

在spring中加入了  

<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <property name="prefix" value="/"></property>
    <property name="suffix" value=".jsp"></property>
</bean> 

这么写就行了 

 关于静态资源无法访问的问题 

 3种解决方案 

 1  web.xml中加mapping 

  

 <!--<servlet-mapping>-->
        <!--<servlet-name>default</servlet-name>-->
        <!--<url-pattern>*.PNG</url-pattern>-->
    <!--</servlet-mapping>-->

    <!--<servlet-mapping>-->
        <!--<servlet-name>default</servlet-name>-->
        <!--<url-pattern>*.jpg</url-pattern>-->
    <!--</servlet-mapping>-->

   直接加入mapping   什么类型就写什么 .什么结尾 

    2

<mvc:default-servlet-handler></mvc:default-servlet-handler>

在spring中加入这一行就行 

 3 

  <mvc:resources mapping="/img/**" location="/img/"></mvc:resources>

加入这个  后面陪路径 

现在来讲简写类的id 

  <bean id="send" class="springmmv.cn.dao.Frist"></bean>

 这个是哪个类的bean节点 ，这里的id改为了send  ，有两种 

  1

 <bean class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">

     
        <property name="urlMap">
            <map>
                <entry key="/la" value="send"></entry>
            </map>
        </property>

    </bean>

2

 <bean class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">

        <!--<property name="mappings">-->
            <!--<props>-->
                <!--<prop key="/la">df</prop>-->
            <!--</props>-->
        <!--</property>-->


    </bean>

 urlMap  mappings

   我们访问是，还是写/la就行  

现在我们来改写类 

我们让她继承一下 

AbstractController   

public class Frist extends AbstractController {
    protected ModelAndView handleRequestInternal(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) throws Exception {
        ModelAndView mx=new  ModelAndView();
     mx.setViewName("index");
     return mx;
    }

}

之后 ，spring的配置文件 要改写 

<bean id="send" class="springmmv.cn.dao.Frist">

        <property name="supportedMethods" value="GET,POST"></property>

    </bean>

改成这样就可以了

  

参数的自动装配和路径变量  

参数自动装配（四种）

package demo08ParamAuto01.AutoWire;

import java.util.List;

/**
 * Created by mycom on 2018/3/26.
 */
public class UserInfo {
    private String username;
    private String password;
    private Car car;
    private List<Car> list;

    public List<Car> getList() {
        return list;
    }

    public void setList(List<Car> list) {
        this.list = list;
    }

    public Car getCar() {
        return car;
    }

    public void setCar(Car car) {
        this.car = car;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }
}

package demo08ParamAuto01.AutoWire;

/**
 * Created by mycom on 2018/3/26.
 */
public class Car {
    private String brand;

    public String getBrand() {
        return brand;
    }

    public void setBrand(String brand) {
        this.brand = brand;
    }
}

　　

package demo08ParamAuto01.AutoWire;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;

/**
 * Created by mycom on 2018/3/26.
 */
@Controller
public class UserInfoController {
 
    @RequestMapping("/login")
    public String doLogin(String username, String password, Model model){
        model.addAttribute("username",username);
        System.out.println(username);
        System.out.println(password);
        return "success";
    }


    @RequestMapping("/loginUserInfo")
    public String doLoginUserInfo(UserInfo info, Model model){
        model.addAttribute("username",info.getUsername());
        System.out.println(info.getUsername());
        System.out.println(info.getPassword());
        return "success";
    }


    
    @RequestMapping("/loginUserInfoCar")
    public String doLoginUserInfoCar(UserInfo info, Model model){
        model.addAttribute("username",info.getUsername());
        System.out.println(info.getUsername());
        System.out.println(info.getPassword());
        System.out.println(info.getCar().getBrand());
        return "success";
    }

    @RequestMapping("/loginUserInfoList")
    public String doLoginUserInfoList(UserInfo info, Model model){
        model.addAttribute("username",info.getUsername());
        System.out.println(info.getUsername());
        System.out.println(info.getPassword());
        System.out.println(info.getCar().getBrand());
        System.out.println(info.getList().get(0).getBrand());
        System.out.println(info.getList().get(1).getBrand());
        return "success";
    }
}

　　

<?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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">

    <context:component-scan base-package="demo08ParamAuto01.AutoWire"></context:component-scan>

    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/"></property>
        <property name="suffix" value=".jsp"></property>
    </bean>


</beans>

　　  配置文件的扫描，之前都有     

  现在给一下，页面 jsp 

<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<form action="${pageContext.request.contextPath}/loginUserInfoList" method="post">
    用户名：<input name="username"/>
    密码：<input name="password"/>
    车：<input name="car.brand">
    车1：<input name="list[0].brand">
    车2：<input name="list[1].brand">
    名：<input name="uname">
    <input type="submit" value="提交">

</form>
</body>
</html>

　　

2.路径变量  @PathVariable

路径参数类似请求参数，但没有key部分，只是一个值。例如下面的URL: 
　http://localhost:9090/showUser/spring 
其中的spring是表示用户的密码字符串。在Spring MVC中，spring被作为路径变量用来发送一个值到服务器。Sping 3以后Spring 3以后支持注解@PathVariable用来接收路径参数。为了使用路径变量，首先需要在RequestMapping注解的值属性中添加一个变量，该变量必须放在花括号之间

    @RequestMapping("/loginUserInfoPath/{username}")
    public String doLoginUserInfoPath(@PathVariable("username") String uname,String username){
        System.out.println(uname);
        System.out.println(username);
        return "success";
    }

不要忘记修改web.xml和springmvc.xml的配置文件的路径和包的路径

在页面上

<%--
  Created by IntelliJ IDEA.
  User: mycom
  Date: 2018/3/26
  Time: 11:57
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<form action="${pageContext.request.contextPath}/loginUserInfoPath/happy" method="post">
    用户名：<input name="username"/>
    <input type="submit" value="提交">

</form>
</body>
</html>