A small example of springmvc (1)

Personally, there are two best ways to learn the framework: one is to practice the framework and use it for real, such as the spring framework, first build a simple spring project, and then enrich it step by step, learn from it The essence and knowledge of the spring framework; the other is to look at the source code, which has been recommended by countless great gods, but he needs a certain ability (at least you must have a certain knowledge accumulation of design patterns and sufficient java coding ability).

Simply implement springmvc today:

First, create a maven-archetype-webapp project, the path diagram is as follows:

pom file, import the required jar package:

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.xuejupo</groupId>
    <packaging>war</packaging>
    <version>0.0.1-SNAPSHOT</version>
    <name>test Maven Webapp</name>
    <url>http://maven.apache.org</url>
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <spring.version>3.2.4.RELEASE</spring.version>
    </properties>

    <dependencies>
        <!-- junit -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12-beta-3</version>
            <scope>test</scope>
        </dependency>
        <!-- log4j -->
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>

        <dependency>
            <groupId>jstl</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>

        <!-- Spring's basic dependencies start -->

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-expression</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aop</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context-support</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aspects</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <!-- end of spring's basic dependencies-->
    </dependencies>
    <build>
        <finalName>test</finalName>
    </build>
    <artifactId>test</artifactId>
</project>

And then the web.xml file:

<?xml version="1.0" encoding="UTF-8"?>  
<web-app 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"  
    version="2.5">  
    <!-- Distinguish the project name to prevent the default duplicate name-->    
    <context-param>    
        <param-name>webAppRootKey</param-name>    
        <param-value>maven.cainiao.root</param-value>    
    </context-param>    
    
    <!-- Spring's log4j listener -->    
    <listener>    
        <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>    
    </listener>    
    
    <!-- charset filter-->    
    <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>    
        <init-param>    
            <param-name>forceEncoding</param-name>    
            <param-value>true</param-value>    
        </init-param>    
    </filter>    
    <filter-mapping>    
        <filter-name>CharacterEncodingFilter</filter-name>    
        <url-pattern>/*</url-pattern>    
    </filter-mapping>    
    
    <!-- Spring view dispatcher-->    
    <servlet>    
        <servlet-name>dispatcher_cainiao</servlet-name>    
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>    
        <init-param>    
            <param-name>contextConfigLocation</param-name>    
            <param-value>/WEB-INF/dispatcher_cainiao.xml</param-value>    
        </init-param>    
        <load-on-startup>1</load-on-startup>    
    </servlet>
    <servlet-mapping>    
        <servlet-name>dispatcher_cainiao</servlet-name>    
        <url-pattern>/</url-pattern>    
    </servlet-mapping>    
</web-app>

dispatcher_cainiao.xml: (this is c in mvc, control layer)

<?xml version="1.0" encoding="UTF-8"?>  
<beans xmlns="http://www.springframework.org/schema/beans"   
       xmlns:aop="http://www.springframework.org/schema/aop"   
       xmlns:context="http://www.springframework.org/schema/context"  
       xmlns:mvc="http://www.springframework.org/schema/mvc"   
       xmlns:tx="http://www.springframework.org/schema/tx"   
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
       xsi:schemaLocation="http://www.springframework.org/schema/aop   
        http://www.springframework.org/schema/aop/spring-aop-3.0.xsd   
        http://www.springframework.org/schema/beans   
        http://www.springframework.org/schema/beans/spring-beans-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   
        http://www.springframework.org/schema/tx   
        http://www.springframework.org/schema/tx/spring-tx-3.0.xsd">  
  
    <mvc:annotation-driven />  
    <!-- <mvc:default-servlet-handler/> -->
    <context:component-scan base-package="controller" />  
  	
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">  
        <property name="prefix" value="/views/" />  
        <property name="suffix" value=".jsp" />
        <property name="viewClass" value="org.springframework.web.servlet.view.JstlView" />
    </bean>  
</beans>

User class: (m in mvc, model layer)

package com.beans;

/**  
 * User : User bean
 * @author xuejupo  [email protected]
 *
 * create in 2016-3-1 4:23:16 pm    
 */

public class User {
    public final String getUserId() {
        return userId;
    }
    public final void setUserId(String userId) {
        this.userId = userId;
    }
    public final String getUserName() {
        return userName;
    }
    public final void setUserName(String userName) {
        this.userName = userName;
    }
    public final String getPasswd() {
        return passwd;
    }
    public final void setPasswd(String passwd) {
        this.passwd = passwd;
    }
    public final String getInfo() {
        return info;
    }
    public final void setInfo(String info) {
        this.info = info;
    }
    private String userId;
    
    private String userName;
    
    private String passwd;
    
    private String info;
    
    @Override
    public String toString(){
        return "User name:\r\n"+this.userName + "User password:\r\n"+this.passwd + "User information:\r\n"+ this.info;
    }
}

The controller DispatcherController (together with the dispatcher_cainiao.xml file forms the control layer, which controls which part of the code logic and which model layer should be used for the incoming url):

package controller;


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

import com.test.beans.User;


/**  
* DispatcherController:
* @author xuejupo  [email protected]
*
* create in 2016-3-1 3:35:13 PM  
*    
*/
@Controller
@RequestMapping("demo")
public class DispatcherController {
    @RequestMapping(method=RequestMethod.GET)    
    public String printWelcome(ModelMap model) {  
        User user = new User();
        user.setInfo("Haha, I'm the only user!");
        user.setUserName("I am the boss!");
        user.setPasswd("Don't tell you!");
        model.addAttribute("str0121", "I'll go, it's a success!!!");
        model.addAttribute("info","The current user information is:");
        model.addAttribute("user", user);
        System.out.println("index.jsp");
        return "index";
    }  
}

index.jsp (the v layer in mvc, the display layer, the layer responsible for displaying the results to the front end and dealing directly with users)

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>    
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>    
<!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>    
        <c:out value="${str0121}"></c:out>
        <p>
        <c:out value="${info}"></c:out>
        <p>
        <c:out value="${user}"></c:out>
    </body>    
</html>

Then enter in the url: http://localhost:8080/test/demo

result:

PS: There were two bugs during the build process.

1. Because I am using jboss, I got this error when publishing:

java.lang.IllegalStateException: Could not detect JBoss VFS infrastructure

The online query is that spring4 has removed the VFS support for jboss. . . . So I use spring3 in my pom.

2.No mapping found for HTTP request with URI

Add this dependency to the pom:

<groupId>org.springframework</groupId>

<artifactId>spring-tx</artifactId>

<version>${spring.version}</version>

</dependency>

That's it. . The reason is temporarily unknown. Online query spring-tx provides transaction management functions and support for JAO and DAO functions. But the specific reason is still unknown, please leave a message to let the gods know. . .

Only update these for the time being today, and next time I will analyze the role of each configuration file and the specific process of access.

PS: Welcome to reprint, please indicate the source of reprint:

http://709002341.iteye.com/admin/blogs/2280103

A small example of springmvc (1)

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