SSM簡單整合——Spring整合SpringMVC

此處的整合是一次比較簡單的整合，並沒有用到工程的拆分和聚合思想。

1.搭建簡單的整合環境

整合思路
1.先搭建整合環境，此處直接通過骨架創建web工程
2.完成Spring的搭建配置
3.使用Spring整合SpringMVC
4.使用Spring整合Mybatis

示例代碼

創建數據庫和表結構

create database ssm;
create table account(
	id int primary key auto_increment,
	name varchar(20),
	money double(7,2)
);

編寫實體類

package com.liang.domain;

import java.io.Serializable;

/**
 * 賬戶實體類
 */
public class Account implements Serializable {

    private Integer id;
    private String name;
    private Double money;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Double getMoney() {
        return money;
    }

    public void setMoney(Double money) {
        this.money = money;
    }

    @Override
    public String toString() {
        return "Account{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", money=" + money +
                '}';
    }

}

編寫業務層接口

package com.liang.service;

import com.liang.domain.Account;

import java.util.List;

/**
 * 賬戶的業務層接口
 */
public interface AccountService {

    /**
     * 查詢所有賬戶
     * @return
     */
    public List<Account> findAll();

    /**
     * 保存賬戶
     * @param account
     */
    public void saveAccount(Account account);
}

編寫持久層接口

package com.liang.dao;

import com.liang.domain.Account;

import java.util.List;

/**
 * 賬戶的持久層接口
 */
public interface AccountDao {

    /**
     * 查詢所有賬戶
     * @return
     */
    List<Account> findAll();

    /**
     * 保存賬戶
     */
    void saveAccount(Account account);
}

編寫Spring代碼，保證其能夠獨立運行

編寫spring配置文件(spring.xml)

<?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:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        https://www.springframework.org/schema/beans/spring-beans.xsd
         http://www.springframework.org/schema/context
         https://www.springframework.org/schema/context/spring-context.xsd">

    <!--配置spring創建容器時要掃描的包-->
    <context:component-scan base-package="com.liang"></context:component-scan>

</beans>

使用註解配置業務層和持久層

package com.liang.service.impl;

import com.liang.dao.AccountDao;
import com.liang.domain.Account;
import com.liang.service.AccountService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

/**
 * 賬戶的業務層實現類
 */
@Service(value = "accountService")
public class AccountServiceImpl implements AccountService {

    @Autowired
    public AccountDao accountDao;

    public List<Account> findAll(){
        System.out.println("AccountServiceImpl ——> findAll方法執行了...");
        return accountDao.findAll();
    }

    @Override
    public void saveAccount(Account account) {
        System.out.println("AccountServiceImpl ——> saveAccount方法執行了...");
        accountDao.saveAccount(account);
    }
}

package com.liang.dao.impl;

import com.liang.dao.AccountDao;
import com.liang.domain.Account;
import org.springframework.stereotype.Repository;

import java.util.List;

/**
 * 賬戶的持久層實現類
 */
@Repository(value = "accountDao")
public class AccountDaoImpl implements AccountDao {

    @Override
    public List<Account> findAll() {
        System.out.println("查詢所有用戶");
        return null;
    }

    @Override
    public void saveAccount(Account account) {
        System.out.println("保存賬戶");
    }
}

測試spring獨立運行

package com.liang.test;

import com.liang.service.AccountService;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

/**
 * 測試spring環境
 */
public class SpringTest {

    @Test
    public void springTest(){
        ApplicationContext applicationContext = new ClassPathXmlApplicationContext("spring.xml");
        AccountService accountService = (AccountService) applicationContext.getBean("accountService");
        accountService.findAll();
        System.out.println("測試完畢");
    }
}

所需jar包

  <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>5.2.7.RELEASE</version>
    </dependency>
        <!--junit-->
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.11</version>
    </dependency>

編寫SpringMVC代碼，保證其能夠獨立運行

在web.xml中配置核心控制器

<!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>
    <!--配置SpringMVC的核心控制器-->
    <servlet>
        <servlet-name>dispatcherServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <!--配置初始化參數：用於讀取SpringMVC的配置文件-->
        <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>
    <!--配置SpringMVC編碼過濾器-->
    <filter>
        <filter-name>characterEncodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <!--設置過濾器中的屬性值-->
        <init-param>
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
    </filter>
    <!--過濾所有請求-->
    <filter-mapping>
        <filter-name>characterEncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
</web-app>

編寫SpringMVC的配置文件

<?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:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        https://www.springframework.org/schema/beans/spring-beans.xsd
         http://www.springframework.org/schema/context
         https://www.springframework.org/schema/context/spring-context.xsd
         http://www.springframework.org/schema/mvc
         https://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <!--配置需要掃描的包-->
    <context:component-scan base-package="com.liang.controller">
        <!--表示只掃描@Controller註解的java類-->
        <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>

    <!--配置視圖解析器-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/pages/"/>
        <property name="suffix" value=".jsp"/>
    </bean>

    <mvc:annotation-driven></mvc:annotation-driven>
</beans>

編寫jsp和Controller
index.jsp頁面代碼

<%@page contentType="text/html; charset=UTF-8" language="java" isELIgnored="false" %>
<html>
<body>
    <h2>賬戶操作</h2>

    <a href="SSMtest/findAllAccount">查詢所有賬戶</a><br/><br/><br/>
    <form action="SSMtest/saveAccount" method="post">
        姓名：<input type="text" name="name"><br/>
        金額：<input type="text" name="money"><br/>
        <input type="submit" value="保存"><br/>
    </form>
</body>
</html>

WEB-INF/pages/success.jsp頁面代碼

<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
執行成功！！！<br/><br/>
<c:forEach items="${accounts}" var="account">
    <c:out value="${account.id}"></c:out>
    <c:out value="${account.name}"></c:out>
    <c:out value="${account.money}"></c:out><br/>
</c:forEach>
</body>
</html>

控制器代碼

package com.liang.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

@Controller
@RequestMapping(path = "/SSMtest")
public class AccountController {

    @RequestMapping(path = "/findAllAccount")
    public ModelAndView findAllAccount(){
        System.out.println("controller  findAll方法執行了");
        ModelAndView modelAndView = new ModelAndView();
        modelAndView.setViewName("success");
        return modelAndView;
    }

    @RequestMapping(path = "/saveAccount")
    public String saveAccount(Account account){
        System.out.println("controller  findAll方法執行了");
        return "redirect:/SSMtest/findAllAccount";
    }
}

所需jar包

  <!--springmvc-->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>5.2.7.RELEASE</version>
    </dependency>
    <!--jstl-->
    <dependency>
      <groupId>jstl</groupId>
      <artifactId>jstl</artifactId>
      <version>1.2</version>
    </dependency>

使用Spring整合SpringMVC

目的：在controller中能夠成功的調用service對象中的方法
思路：在項目啓動的時候，就加載spring的配置文件，則需要在web.xml中配置ContextLoaderListener監聽器(該監聽器只能加載WEB-INF目錄下的名爲applicationContext.xml配置文件)
修改web.xml文件（添加監聽器代碼）

    <!--配置spring的監聽器：用於啓動服務時加載容器-->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    <!--指定spring配置文件-->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:spring.xml</param-value>
    </context-param>    

修改spring配置文件

    <!--配置spring創建容器時要掃描的包-->
    <context:component-scan base-package="com.liang">
        <!--表示不掃描@Controller註解的java類-->
        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>

修改控制器代碼

package com.liang.controller;

import com.liang.domain.Account;
import com.liang.service.AccountService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

import java.util.List;

@Controller
@RequestMapping(path = "/SSMtest")
public class AccountController {

    @Autowired
    private AccountService accountService;

    @RequestMapping(path = "/findAllAccount")
    public ModelAndView findAllAccount(){
        System.out.println("controller  findAll方法執行了");
        List<Account> accounts = accountService.findAll();
        ModelAndView modelAndView = new ModelAndView();
        modelAndView.addObject("accounts",accounts);
        modelAndView.setViewName("success");
        return modelAndView;
    }

    @RequestMapping(path = "/saveAccount")
    public String saveAccount(Account account){
        System.out.println("controller  findAll方法執行了");
        accountService.saveAccount(account);
        return "redirect:/SSMtest/findAllAccount";
    }
}