SpringMVC

作者: dillqq | 来源:发表于2019-11-18 16:41 被阅读0次

springMvc执行流程
SpringMVC/Hibernate项目实践一
SpringMVC/Hibernate项目实践二
SpringMVC/Hibernate项目实践三
扩展和全面接管SpringMVC
springmvc学习笔记(1)-框架原理和入门配置
SpringMVC框架学习0：SpringMVC 概述、Spri
java基础-day56-SpringMVC-02
2018-09-05
手写源码（三）：自己实现SpringMVC

配置文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
   xmlns:context="http://www.springframework.org/schema/context"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xmlns:mvc="http://www.springframework.org/schema/mvc"
   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 http://www.springframework.org/schema/cache http://www.springframework.org/schema/cache/spring-cache.xsd">

RequestMapping注解

作用范围：类或者方法上（作用于类上，类中的方法必须为类中映射的子路径下）
属性：path和value作用一样指定当前路径，
method限制方法的请求方式
params请求中必须包含的参数名或者请求中必须包含参数的名和值
headers头请求必须包含的值

请求参数的绑定

绑定基本类型，javabean类型，集合

集合

用户名字：<input type="text" name="list[0].username"/>
用户年龄：<input type="text" name="list[0].age"/>


用户名字：<input type="text" name="map['one'].username"/>
用户年龄：<input type="text" name="map['one'].age"/>

请求中参数与控制器中方法参数名一致

出现乱码配置过滤器

  <!--  拦截器-->
    <filter>
<filter-name>characterEncodingFilter</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
  <param-name>encoding</param-name>
  <param-value>UTF-8</param-value>
</init-param>
   </filter>
  <filter-mapping>
  <filter-name>characterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
  </filter-mapping>

自定义类型转换器

public class StringtoDateConverts implements Converter<String , Date> {
@Override
public Date convert(String s) {
    if (s == null)
    {
        throw new RuntimeException("未输入");
    }
    DateFormat format = new SimpleDateFormat("yyyy-MM-dd");
    try {
        return format.parse(s);
    } catch (ParseException e) {
        throw new RuntimeException("转换错误");
    }
}
}

实例代码

  <%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<a href="user/hello?username=heh">first hello </a>

<form action="user/save" method="get">
姓名：<input type="text" name="username"/>
密码：<input type="text" name="password"/>
金额：<input type="text" name="money"/>


用户名字：<input type="text" name="list[0].username"/>
用户年龄：<input type="text" name="list[0].age"/>


用户名字：<input type="text" name="map['one'].username"/>
用户年龄：<input type="text" name="map['one'].age"/>
<input type="submit" value="提交"/>
  </form><br/><br/><br/>




<form action="user/saveAccount" method="get">
    姓名：<input type="text" name="username"/>
    年龄：<input type="text" name="age"/>
    日期：<input type="date" name="date"/>

    <input type="submit" value="提交"/>
</form>






<a href="user/test">first hello </a>
</body>
</html>

web.xml

  <!DOCTYPE web-app PUBLIC

"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd" >

    <web-app>
    <display-name>Archetype Created Web Application</display-name>
    <servlet>
    <servlet-name>dispatcherServlet</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>
<load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
<servlet-name>dispatcherServlet</servlet-name>
<url-pattern>/</url-pattern>
  </servlet-mapping>

<!--  拦截器-->
  <filter>
<filter-name>characterEncodingFilter</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
  <param-name>encoding</param-name>
  <param-value>UTF-8</param-value>
</init-param>
  </filter>
  <filter-mapping>
<filter-name>characterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
  </filter-mapping>



</web-app>

springmvc.xml配置

  <?xml version="1.0" encoding="UTF-8"?>
  <beans xmlns="http://www.springframework.org/schema/beans"
   xmlns:context="http://www.springframework.org/schema/context"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xmlns:mvc="http://www.springframework.org/schema/mvc"
   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
                        http://www.springframework.org/schema/cache
                        http://www.springframework.org/schema/cache/spring-cache.xsd">

  <!--    开启注解扫描-->
<context:component-scan base-package="com.zheng"/>
<!--        开启视图解析-->
<bean id="internalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <property name="prefix" value="/WEB-INF/pages/"/>
    <property name="suffix" value=".jsp"/>
 </bean>
  <!--    开启springMVC框架注解分析-->
<mvc:annotation-driven  conversion-service="conversionServiceFactoryBean"/>

<bean id="conversionServiceFactoryBean"  class="org.springframework.context.support.ConversionServiceFactoryBean">
    <property name="converters">
        <set>
            <bean class="com.zheng.utils.StringtoDateConverts"/>
        </set>
    </property>
</bean>
</beans>

控制器

@Controller
@RequestMapping(path = "/user")

public class HelloController {

@RequestMapping(path = "/hello", method = {RequestMethod.GET}, params = {"username"},headers = {"Accept"})
public String sayHello(String username)
{
    System.out.println("Hello SpringMVC"+username);
    return "success";
}

@RequestMapping(path = "/save", method = {RequestMethod.GET}, params = {"username"},headers = {"Accept"})
public String save(Account account)
{
    System.out.println("Hello SpringMVC"+account);
    return "success";
}


@RequestMapping(path = "/saveAccount", method = {RequestMethod.GET}, params = {"username"},headers = {"Accept"})
public String saveAccount(Account2 account)
{
    System.out.println("Hello SpringMVC"+account);
    return "success";
}


//    获取原生API


@RequestMapping(path = "/test", method = {RequestMethod.GET}, headers = {"Accept"})
public String test(HttpServletRequest request, HttpServletResponse response)
{
    System.out.println("Hello SpringMVC");
    System.out.println(request);
    HttpSession session = request.getSession();
    System.out.println(response);
    return "success";
}
}

常用注解

@RequestParam(value = "username")用于方法参数，解决传入参数和方法参数名不一致封装不上的问题。

@RequestBody 用于获取请求体

@PathVariable(name=“id”)用于rest方

@RequestHeader(value=“Accept”)用于获取指定的头部信息

@CookieValue(value=“JSSIONID”)获取Cookie的值
有返回值，为了给对象封装，作用于调用的方法

@ModelAttribute 作用于调用方法之前有两种方式，有返回值和无返回值。
有返回值作用于方法是指，封装了对象后将返回值给后面的调用方法。
无返回值作用于方法是指，参数中要提供一个map<String , User> 将对象封装到map中的，然后调用的方法就可以在参数中使用注解根据map中的key值调用User对象

public String test(HttpServletRequest request, HttpServletResponse response,@ModelAttribute("abc") User user)

@SessionAttributes注解作用于类上，会将requst域中的值存储到session中

Model对象是一个map，数据会存储到request域中。model.addAttribute(String,Object)存储，modlMap.get(String)取出对象，清除session中的值SessionStatus.setComple()清楚session中的值

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