SpringMVC

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

    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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          本文标题:SpringMVC

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