springMVC配置步骤

时间：2021-10-24 08:19:07

所用的工具为eclipse for javaEE,tomcat 8.0

1.导入jar包

springMVC配置步骤

把以上的jar包全部复制到项目的WebContent/WEB-INF/lib目录中

2.在webContent/WEB-INF下新增或编辑web.xml

springMVC配置步骤

web.xml的完整内容为:

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

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

    xmlns="http://java.sun.com/xml/ns/javaee" xmlns:jsp="http://java.sun.com/xml/ns/javaee/jsp"

    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"

    version="2.5">

    <display-name>hadoopWeb</display-name>

    <servlet>

        <servlet-name>spring</servlet-name>

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

        <init-param>

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

            <param-value>classpath:spring-servlet.xml</param-value>

        </init-param>

        <load-on-startup>1</load-on-startup>

    </servlet>

    <servlet-mapping>

        <servlet-name>spring</servlet-name>

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

    </servlet-mapping>

    <welcome-file-list>

        <welcome-file>index.html</welcome-file>

    </welcome-file-list>

</web-app>

这里只拦截.do后缀的请求,spring-servlet.xml放在classpath(右键build path/configure bulid path/source里可以看到哪几个文件夹,也可以在libraries下新增)下就行

3.在java Resource/src下新增或编辑spring-servlet.xml

完整的内容为:

<?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:tx="http://www.springframework.org/schema/tx"

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

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

    xsi:schemaLocation="http://www.springframework.org/schema/beans

    http://www.springframework.org/schema/beans/spring-beans-3.0.xsd

    http://www.springframework.org/schema/tx

    http://www.springframework.org/schema/tx/spring-tx-3.0.xsd

    http://www.springframework.org/schema/context

    http://www.springframework.org/schema/context/spring-context-3.0.xsd

    http://www.springframework.org/schema/mvc

    http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">

    <!-- 把标记了@Controller注解的类转换为bean -->

    <context:component-scan base-package="action"></context:component-scan>

    <bean id="viewResolver"

        class="org.springframework.web.servlet.view.UrlBasedViewResolver">

        <property name="viewClass"

            value="org.springframework.web.servlet.view.JstlView" />

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

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

    </bean>

</beans>

这里springMVC在拦截到.do后缀的请求后会扫描 scr/action 下标记了@Controller注解的类,处理完后会请求 webContent/ 下的后缀为".jsp"的文件

3.进行测试,顺便记录SpringMVC怎么传值

在webContent下新建jsp文件index.jsp进行传值,完整内容为:

<%@ page language="java" contentType="text/html; charset=utf-8"

    pageEncoding="utf-8"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8">

<title>Insert title here</title>

</head>

<body>

    <form action="print.do">

    <input type="text" name="s" ></input>

    <input type="submit"></input>

    </form>

</body>

</html>

在src/action下新建class文件print.java,完整内容为:

package action;

import org.springframework.stereotype.Controller;

import org.springframework.ui.Model;

import org.springframework.web.bind.annotation.RequestMapping;

@Controller

public class PrintAction {

    @RequestMapping(value="print.do")

    public String print(String s,Model model){

        System.out.println(s);

        s+=".badck";

        model.addAttribute("s2",s);

        return "print";

    }

}

在webContent下新建jsp文件print.jsp,完整内容为:

<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html">
<title>Insert title here</title>
</head>
<body>
<%
String s=(String)request.getAttribute("s2");
out.println("输入的内容为:"+s);
%>

</body>
</html>

index.jsp请求print.do,被pringMVC拦截到,扫描action文件夹,发现print.java被标注为Controller,并发现它的方法print(String s,Model model)被注释了@RequestMapping(value="print.do"),开始运行print方法.

参数s是要传入的值,在index.jsp和print的方法的参数两边的名称要一致,会自动将index.jsp 的请求中的名为"s"的值传到参数中的"s",

在print.java中处理完后,通过model.addAttribute("s2",s); 语句把s的值传给下一个文件,由于最后return "print";,所以springMVC会到webContent下找名为"print",后缀为".jsp"的文件

在print.jsp上接收的时候用String s=(String)request.getAttribute("s2");语句接受s的值.

效果:

在index.jsp输入3并提交

springMVC配置步骤

跳转到print.jsp,显示3.badck

springMVC配置步骤

并在后台输出了3,我运行了两次,所以有两个3

springMVC配置步骤

最后print.jsp输出带了".badck"并在后台有输出说明print.java确实运行到了

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