• springMVC前后台数据交互


      假设项目需求是在springMVC框架下,后台要传送一个list到前台,那我们就要做以下几个步骤:

    1 在web.xml文件中进行springMVC的配置:

    <?xml version="1.0" encoding="UTF-8"?>
    <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
        http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
        <display-name></display-name>
    
        <servlet>
            <servlet-name>springmvc</servlet-name>
            <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
            <init-param>
                <param-name>contextConfigLocation</param-name>
                <param-value>classpath:mvc.xml</param-value>
            </init-param>
            <load-on-startup>1</load-on-startup>
        </servlet>
        <servlet-mapping>
            <servlet-name>springmvc</servlet-name>
            <url-pattern>*.do</url-pattern>
        </servlet-mapping>
    
        <welcome-file-list>
            <welcome-file>index.jsp</welcome-file>
        </welcome-file-list>
    </web-app>

    上图中标红的区域就是配置前后台交互的重要配置信息,即servlet的配置。

    2 在src的目录下建立一个mvc.xml文件,对应web.xml文件中的<param-value>classpath:mvc.xml</param-value>配置。即渲染器配置,能够让前台命令提交的命令精确传送到后台,后台的数据准确传送到前台。配置如下:

    <?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:p="http://www.springframework.org/schema/p"
        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/context
            http://www.springframework.org/schema/context/spring-context.xsd">
            
        <!-- 配置视图渲染器 -->
        <bean id="jspViewResolver"
            class="org.springframework.web.servlet.view.InternalResourceViewResolver">
            <property name="viewClass"
                value="org.springframework.web.servlet.view.JstlView" />
            <!-- 将视图名 渲染后视图的前缀 -->
            <property name="prefix" value="/WEB-INF/jsp/" />
            <!-- 渲染后视图的后缀 -->
            <property name="suffix" value=".jsp" />
            <!-- 例:视图名为:hello 渲染后:/WEB-INF/jsp/hello.jsp 该页面 -->
        </bean>
        <context:component-scan base-package="com.test.controller"/>
    </beans>

    3 最后是controller,功能相当于ssh框架中的action,功能是处理前台传过来的命令。从上边的mvc.xml文件的配置就能看出来,这里我们用的是注解开发,如下:

    @Controller
    public class ProgramLogController {
        @RequestMapping("/proLog")
        public ModelAndView GetproLog(HttpServletRequest req, HttpServletResponse resp){
            ModelAndView mv = new ModelAndView();
            ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
            ProgramLogDao programLogDao = (ProgramLogDao)context.getBean("programLogDao");
            List<ProgramLog> list = programLogDao.selectProgramLog(Constant.REFUSE);
            mv.addObject("msg", list);
            mv.setViewName("index");
            return mv;
        }
    }

    假设我们传送过来的是list,那么通过上边的代码,打开tomcat服务器,通过在浏览器访问localhost:8080/项目名/proLog.do就可以执行功能了。下面分别附上jsp文件和所引用jar包(jar包多于所需要的)。

    jsp文件

    <%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
    <%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
    <%
    String path = request.getContextPath();
    String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
    %>
    
    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
    <html>
      <head>
        <base href="<%=basePath%>">
        
        <title>programLog</title>
        <meta http-equiv="pragma" content="no-cache">
        <meta http-equiv="cache-control" content="no-cache">
        <meta http-equiv="expires" content="0">    
        <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
        <meta http-equiv="description" content="This is my page">
        <!--
        <link rel="stylesheet" type="text/css" href="styles.css">
        -->
      </head>
      
      <body>
        <table width="80%" align="center">
            <tr>
                <td>序号</td>
                <td>单机序号</td>
                <td>机器号</td>
                <td>动作序号</td>
            </tr>
            <c:forEach items="${msg }" var="log">
            <tr>
                <td>${log.id }</td>
                <td>${log.sid }</td>
                <td>${log.machine_id }</td>
                <td>${log.action_id }</td>
            </tr>
            </c:forEach>
        </table>
      </body>
    </html>

    jar包

    aopalliance.jar
    asm-3.3.1.jar
    aspectjweaver.jar
    cglib-2.2.2.jar
    commons-logging-1.1.1.jar
    javassist-3.17.1-GA.jar
    log4j-1.2.17.jar
    log4j-api-2.0-rc1.jar
    log4j-core-2.0-rc1.jar
    mybatis-3.2.7.jar
    mybatis-spring-1.2.1.jar
    mysql-connector-java-5.1.20-bin.jar
    slf4j-api-1.7.5.jar
    slf4j-log4j12-1.7.5.jar
    spring-aop-4.1.6.RELEASE.jar
    spring-aspects-4.1.6.RELEASE.jar
    spring-beans-4.1.6.RELEASE.jar
    spring-context-4.1.6.RELEASE.jar
    spring-context-support-4.1.6.RELEASE.jar
    spring-core-4.1.6.RELEASE.jar
    spring-expression-4.1.6.RELEASE.jar
    spring-jdbc-4.1.6.RELEASE.jar
    spring-orm-4.1.6.RELEASE.jar
    spring-tx-4.1.6.RELEASE.jar
    spring-web-4.1.6.RELEASE.jar
    spring-webmvc-4.1.6.RELEASE.jar
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  • 原文地址:https://www.cnblogs.com/K-artorias/p/6842839.html
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