Maven + Spring + SpringMVC + MyBatis + MySQL框架搭建Java Web工程

2023年7月20日 170次阅读来源: VitaAin

参考：
Java框架搭建-Maven、Mybatis、Spring MVC整合搭建
SSM框架——Spring+SpringMVC+Mybatis的搭建教程

一下载并安装Eclipse-jee

二新建Maven项目

菜单File -> New -> Maven Project ，
点击Next ，在Archetype 列表中选择maven-archetype-webapp ，
点击Next ，在Group Id 中填入包名，此处为com.vita ，Artifact Id 中填入工程名，此处为First ，Finish
新建项目后，会看到报错，这是因为build path 没有引入java ee包
- 设置build path
  - 右键项目，Build Path -> Configure Build Path... -> Libraries
  - 双击JRE System Library 以编辑，选择Alternate JRE 或Workspace default JRE ，这里选择Alternate JRE ，Finish

三项目配置文件配置

1 配置pom.xml

<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.vita</groupId>
    <artifactId>First</artifactId>
    <packaging>war</packaging>
    <version>1.0-SNAPSHOT</version>
    <name>First Maven Webapp</name>
    <url>http://maven.apache.org</url>

    <properties>
        <!-- spring版本号 -->
        <spring.version>4.0.5.RELEASE</spring.version>
        <!-- mybatis版本号 -->
        <mybatis.version>3.2.1</mybatis.version>
        <!-- log4j日志文件管理包版本 -->
        <slf4j.version>1.6.6</slf4j.version>
        <log4j.version>1.2.12</log4j.version>
        <mysql.version>5.1.35</mysql.version>
    </properties>

    <dependencies>
        <!-- 导入java ee jar，该包已被移除，找不到，故导入会报错，注释以提醒 -->
        <!-- <dependency>
            <groupId>javax</groupId>
            <artifactId>javaee-api</artifactId>
            <version>7.0</version>
        </dependency> -->

        <!-- 添加Spring依赖 -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-oxm</artifactId>
            <version>${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-aop</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>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <!--spring单元测试依赖 -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>${spring.version}</version>
            <scope>test</scope>
        </dependency>

        <!-- spring webmvc相关jar -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <!-- mysql驱动包 -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>${mysql.version}</version>
        </dependency>

        <!-- 导入dbcp的jar包，用来在applicationContext.xml中配置数据库 -->
        <dependency>
            <groupId>commons-dbcp</groupId>
            <artifactId>commons-dbcp</artifactId>
            <version>1.2.2</version>
        </dependency>

        <!-- alibaba data source 相关jar包 -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>0.2.23</version>
        </dependency>

        <!-- alibaba fastjson 格式化对 -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.1.41</version>
        </dependency>

        <!-- logback start -->
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>${log4j.version}</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>${slf4j.version}</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>${slf4j.version}</version>
        </dependency>
        <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-classic</artifactId>
            <version>1.1.2</version>
        </dependency>
        <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-core</artifactId>
            <version>1.1.2</version>
        </dependency>
        <dependency>
            <groupId>org.logback-extensions</groupId>
            <artifactId>logback-ext-spring</artifactId>
            <version>0.1.1</version>
        </dependency>

        <!-- 映入JSON -->
        <dependency>
            <groupId>org.codehaus.jackson</groupId>
            <artifactId>jackson-mapper-asl</artifactId>
            <version>1.9.13</version>
        </dependency>

        <!-- 上传组件包 -->
        <dependency>
            <groupId>commons-fileupload</groupId>
            <artifactId>commons-fileupload</artifactId>
            <version>1.3.1</version>
        </dependency>
        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.4</version>
        </dependency>
        <dependency>
            <groupId>commons-codec</groupId>
            <artifactId>commons-codec</artifactId>
            <version>1.9</version>
        </dependency>

        <!--mybatis依赖 -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>${mybatis.version}</version>
        </dependency>

        <!-- mybatis/spring包 -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>1.2.2</version>
        </dependency>
        <!-- 添加servlet3.0核心包 -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.0.1</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>javax.servlet.jsp-api</artifactId>
            <version>2.3.2-b01</version>
        </dependency>
        <!-- jstl -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>
        <!--单元测试依赖 -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>3.8.1</version>
            <scope>test</scope>
        </dependency>
    </dependencies>
    <build>
        <finalName>First</finalName>
    </build>
</project>

2 其他配置文件

以下四个配置文件（jdbc.properties, log4j.properties, spring-mvc.xml, spring-mybatis.xml）都创建在Java Resources -> src/main/resources文件夹下

jdbc.properties

driver=com.mysql.jdbc.Driver
# test为数据库名
url=jdbc:mysql://localhost:3306/test
# 数据库访问用户名
username=root
# 数据库访问密码，如无密码则不填
password=
# 定义初始连接数
initialSize=1
# 定义最大连接数
maxActive=20
# 定义最大空闲
maxIdle=20
# 定义最小空闲
minIdle=1
# 定义最长等待时间
maxWait=60000

log4j.properties

### set log levels ###
#log4j.rootLogger = debug , stdout , D , E
log4j.rootLogger = debug , stdout , D

###  output to the console ###
log4j.appender.stdout = org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target = System.out
log4j.appender.stdout.layout = org.apache.log4j.PatternLayout
#log4j.appender.stdout.layout.ConversionPattern = %d{ABSOLUTE} %5p %c{ 1 }:%L - %m%n
log4j.appender.stdout.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss} [%c]-[%p] %m%n

### Output to the log file ###
log4j.appender.D = org.apache.log4j.DailyRollingFileAppender
log4j.appender.D.File = ${springmvc.root}/WEB-INF/logs/log.log
log4j.appender.D.Append = true
log4j.appender.D.Threshold = DEBUG 
log4j.appender.D.layout = org.apache.log4j.PatternLayout
log4j.appender.D.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss} [ %t:%r ] - [ %p ] %m%n

### Save exception information to separate file ###
log4j.appender.D = org.apache.log4j.DailyRollingFileAppender
log4j.appender.D.File = ${springmvc.root}/WEB-INF/logs/error.log 
log4j.appender.D.Append = true
log4j.appender.D.Threshold = ERROR 
log4j.appender.D.layout = org.apache.log4j.PatternLayout
log4j.appender.D.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss} [ %t:%r ] - [ %p ] %m%n

spring-mvc.xml ，注意包名，当前包名为com.vita

<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"
 xmlns:mvc="http://www.springframework.org/schema/mvc"
 xsi:schemaLocation="http://www.springframework.org/schema/beans    
                        http://www.springframework.org/schema/beans/spring-beans-3.1.xsd    
                        http://www.springframework.org/schema/context    
                        http://www.springframework.org/schema/context/spring-context-3.1.xsd    
                        http://www.springframework.org/schema/mvc    
                        http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">

 <!-- 自动扫描该包，使SpringMVC认为包下用了@controller注解的类是控制器 -->
 <context:component-scan base-package="com.vita.controller" />

 <!-- 定义跳转的文件的前后缀 ，视图模式配置 -->
 <bean id="viewResolver"
     class="org.springframework.web.servlet.view.InternalResourceViewResolver">
     <!-- 这里的配置我的理解是自动给后面action的方法return的字符串加上前缀和后缀，变成一个 可用的url地址 -->
     <property name="prefix" value="/WEB-INF/jsp/" />
     <property name="suffix" value=".jsp" />
 </bean>

 <!--避免IE执行AJAX时，返回JSON出现下载文件 -->
 <bean id="mappingJacksonHttpMessageConverter"
     class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">
     <property name="supportedMediaTypes">
         <list>
             <value>text/html;charset=UTF-8</value>
         </list>
     </property>
 </bean>
 <!-- 启动SpringMVC的注解功能，完成请求和注解POJO的映射 -->
 <bean
     class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
     <property name="messageConverters">
         <list>
             <ref bean="mappingJacksonHttpMessageConverter" /> <!-- JSON转换器 -->
         </list>
     </property>
 </bean>
 <!-- 定义跳转的文件的前后缀 ，视图模式配置 -->
 <bean
     class="org.springframework.web.servlet.view.InternalResourceViewResolver">
     <!-- 这里的配置我的理解是自动给后面action的方法return的字符串加上前缀和后缀，变成一个 可用的url地址 -->
     <property name="prefix" value="/WEB-INF/jsp/" />
     <property name="suffix" value=".jsp" />
 </bean>

 <!-- 配置文件上传，如果没有使用文件上传可以不用配置，当然如果不配，那么配置文件中也不必引入上传组件包 -->
 <bean id="multipartResolver"
     class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
     <!-- 默认编码 -->
     <property name="defaultEncoding" value="utf-8" />
     <!-- 文件大小最大值 -->
     <property name="maxUploadSize" value="10485760000" />
     <!-- 内存中的最大值 -->
     <property name="maxInMemorySize" value="40960" />
 </bean>

</beans>

spring-mybatis.xml ，注意包名，当前包名为com.vita

<?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"
 xmlns:mvc="http://www.springframework.org/schema/mvc"
 xsi:schemaLocation="http://www.springframework.org/schema/beans    
                        http://www.springframework.org/schema/beans/spring-beans-3.1.xsd    
                        http://www.springframework.org/schema/context    
                        http://www.springframework.org/schema/context/spring-context-3.1.xsd    
                        http://www.springframework.org/schema/mvc    
                        http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">
 <!-- 自动扫描 -->
 <context:component-scan base-package="com.vita.service" />
 <!-- 引入配置文件 -->
 <bean id="propertyConfigurer"
     class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
     <property name="location" value="classpath:jdbc.properties" />
 </bean>

 <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
     destroy-method="close">
     <property name="driverClassName" value="${driver}" />
     <property name="url" value="${url}" />
     <property name="username" value="${username}" />
     <property name="password" value="${password}" />
     <!-- 初始化连接大小 -->
     <property name="initialSize" value="${initialSize}"></property>
     <!-- 连接池最大数量 -->
     <property name="maxActive" value="${maxActive}"></property>
     <!-- 连接池最大空闲 -->
     <property name="maxIdle" value="${maxIdle}"></property>
     <!-- 连接池最小空闲 -->
     <property name="minIdle" value="${minIdle}"></property>
     <!-- 获取连接最大等待时间 -->
     <property name="maxWait" value="${maxWait}"></property>
 </bean>

 <!-- spring和MyBatis完美整合，不需要mybatis的配置映射文件 -->
 <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
     <property name="dataSource" ref="dataSource" />
     <!-- 自动扫描mapping.xml文件 -->
     <property name="mapperLocations" value="classpath:com/vita/mapping/*.xml"></property>
 </bean>

 <!-- DAO接口所在包名，Spring会自动查找其下的类 -->
 <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
     <property name="basePackage" value="com.vita.dao" />
     <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>
 </bean>

 <!-- (事务管理)transaction manager, use JtaTransactionManager for global tx -->
 <bean id="transactionManager"
     class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
     <property name="dataSource" ref="dataSource" />
 </bean>

</beans>

四数据库代码自动生成

建库，建表，当前使用MySQL，建库test ，建表user
下载包
mybatis-3.4.5.jar ,
mybatis-generator-core-1.3.6.jar （包含在mybatis-generator-core-1.3.6.zip 中）,
mysql-connector-java-5.1.39-bin.jar （包含在mysql-connector-java-5.1.45.zip 中）
工程中新建一个文件夹存放这些包，此处在工程根目录下建立generate 文件（文件名自取）以存放

在上一步骤中所建目录下（此处为generate ），新建文件generatorConfig.xml ，用以自动生成代码，如下：

<?xml version="1.0" encoding="UTF-8"?>    
<!DOCTYPE generatorConfiguration    
  PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"    
  "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
<generatorConfiguration>
 <!-- 数据库驱动 -->
 <classPathEntry location="mysql-connector-java-5.1.45-bin.jar" />
 <context id="DB2Tables" targetRuntime="MyBatis3">
     <commentGenerator>
         <property name="suppressDate" value="true" />
         <!-- 是否去除自动生成的注释 true：是 ： false:否 -->
         <property name="suppressAllComments" value="true" />
     </commentGenerator>
     <!--数据库链接URL，用户名、密码 -->
     <jdbcConnection driverClass="com.mysql.jdbc.Driver"
         connectionURL="jdbc:mysql://localhost:3306/test" userId="root"
         password="">
     </jdbcConnection>
     <javaTypeResolver>
         <property name="forceBigDecimals" value="false" />
     </javaTypeResolver>
     <!-- 生成模型的包名和位置 -->
     <javaModelGenerator targetPackage="com.vita.domain"
         targetProject="src">
         <property name="enableSubPackages" value="true" />
         <property name="trimStrings" value="true" />
     </javaModelGenerator>
     <!-- 生成映射文件的包名和位置 -->
     <sqlMapGenerator targetPackage="com.vita.mapping"
         targetProject="src">
         <property name="enableSubPackages" value="true" />
     </sqlMapGenerator>
     <!-- 生成DAO的包名和位置 -->
     <javaClientGenerator type="XMLMAPPER"
         targetPackage="com.vita.dao" targetProject="src">
         <property name="enableSubPackages" value="true" />
     </javaClientGenerator>
     <!-- 要生成的表 tableName是数据库中的表名或视图名 domainObjectName是实体类名 -->
     <table tableName="user" domainObjectName="User"
         enableCountByExample="false" enableUpdateByExample="false"
         enableDeleteByExample="false" enableSelectByExample="false"
         selectByExampleQueryId="false"></table>
 </context>
</generatorConfiguration>

注意<classPathEntry location="mysql-connector-java-5.1.45-bin.jar" /> 中的包的版本号，对应下载包的版本，以及jdbcConnection 标签中的数据库参数设置

该目录下执行，生成代码
```
java -jar mybatis-generator-core-1.3.6.jar -configfile generatorConfig.xml -overwrite
```
注意mybatis-generator-core 包的版本，对应下载包的版本
备注：代码自动生成这里通过命令行的方式，也可以通过eclipse的插件方式生成
命令执行前应在目录下新建src 文件夹，否则执行时会提示找不到src 路径，
执行后，刷新工程，当前目录下的src （generate\src）文件夹中会生成对应代码文件：
com/vita/dao/UserMapper.java ,
com/vita/domain/User.java ,
com/vita/mapping/UserMapper.xml

五编写代码

在Java Resources -> src/main/java 下新建包：com.vita.controller , com.vita.dao , com.vita.domain , com.vita.mapping , com.vita.service , com.vita.service.impl
将前面自动生成的代码文件复制到对应包下

com.vita.service 下新建接口IUserService.java ：

package com.vita.service;

import com.vita.domain.User;

public interface IUserService {

 public User getUserById(int id);
 
}

com.vita.service.impl 下新建IUserService 的实现类UserServiceImpl.java ：

注意：添加@Service 注解，否则不被识别

package com.vita.service.impl;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.vita.dao.IUserDao;
import com.vita.domain.User;
import com.vita.service.IUserService;

@Service
public class UserServiceImpl implements IUserService {
 
 @Autowired
 private IUserDao userDao;

 public User getUserById(int id) {
     return userDao.selectByPrimaryKey(id);
 }

}

com.vita.controller 下新建UserController.java 控制器：

注意：添加@Controller 注解，否则不被识别

package com.vita.controller;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;

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

import com.vita.domain.User;
import com.vita.service.impl.UserServiceImpl;

@Controller
@RequestMapping("/user")
public class UserController {

 public UserController() {
     System.out.println("UserController");
 }

 @Resource
 private UserServiceImpl userService;

 @RequestMapping(value = "/showUser", method = RequestMethod.GET)
 public String toIndex(HttpServletRequest request, Model model) {
     System.out.println("UserController showUser");
     int id = Integer.parseInt(request.getParameter("id"));
     User user = userService.getUserById(id);
     System.out.println("user: " + user);
//       request.setAttribute("user", user);
     model.addAttribute("user", user);
     return "showUser";
 }
}

在Deployed Resources -> webapp/WEB-INF 目录下新建文件夹jsp （文件夹名自取），用以存放返回的页面，jsp 目录下新建showUser.jsp ：

<%@ page isELIgnored="false" language="java" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8" import="java.util.*,com.vita.domain.*"%>
<!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>Title</title>
</head>
<body>
 ${user.name}
 ${user.email}
</body>
</html>

web.xml 配置如下：

<!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>

 <context-param>
     <param-name>log4jConfigLocation</param-name>
     <param-value>classpath:log4j.properties</param-value>
     <description>加载日志文件</description>
 </context-param>
 
 <!-- Spring和mybatis的配置文件 -->
 <context-param>
     <param-name>contextConfigLocation</param-name>
     <param-value>classpath:spring-mybatis.xml</param-value>
 </context-param>
 
 <!-- 编码过滤器 -->
 <filter>
     <filter-name>encodingFilter</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>encodingFilter</filter-name>
     <url-pattern>/*</url-pattern>
 </filter-mapping>
 
 <listener>
     <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
 </listener>
 
 <!-- Spring监听器 -->
 <listener>
     <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
 </listener>
 <!-- 防止Spring内存溢出监听器 -->
 <listener>
     <listener-class>org.springframework.web.util.IntrospectorCleanupListener</listener-class>
 </listener>

 <!-- Spring MVC servlet -->
 <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:spring-mvc.xml</param-value>
     </init-param>
     <load-on-startup>1</load-on-startup>
 </servlet>
 <servlet-mapping>
     <servlet-name>SpringMVC</servlet-name>
     <!-- 此处可以可以配置成*.do，对应struts的后缀习惯 -->
     <url-pattern>/</url-pattern>
 </servlet-mapping>
 
 <!-- 起始欢迎界面 -->
 <welcome-file-list>
     <welcome-file>/index.jsp</welcome-file>
 </welcome-file-list>
</web-app>

六结束

到此，demo工程搭建结束，Eclipse中启动Tomcat Server，即可访问：

例：http://localhost:8080/First/user/showUser?id=2

错误记录

`web.xml` 报错`The content of element type "web-app" must match ...`

错误详情：The content of element type "web-app" must match "(icon?,display-name?,description?,distributable?,context-param*,filter*,filter-mapping*,listener*,servlet*,servlet-mapping*,session-config?,mime-mapping*,welcome-file-list?,error-page*,taglib*,resource-env-ref*,resource-ref*,security-constraint*,login-config?,security-role*,env-entry*,ejb-ref*,ejb-local-ref*)".
错误原因：文档内容标签顺序不符合web-app_2_3.dtd规范
解决方案：严格按照提示的顺序安放标签
参考：
web.xml 报错The content of element type “web-app” must match

StandardWrapper.Throwable org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userController': Injection of resource dependencies failed; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.vita.service.IUserService] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@javax.annotation.Resource(shareable=true, lookup=, name=, description=, authenticationType=CONTAINER, type=class java.lang.Object, mappedName=)}

错误原因：XXXService 未加注解@Service

`Servlet.service() for servlet [SpringMVC] in context with path [/First] threw exception [Request processing failed; nested exception is org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): com.vita.dao.IUserDao.selectByPrimaryKey] with root cause java.lang.IllegalArgumentException: Mapped Statements collection does not contain value for com.vita.dao.IUserDao.selectByPrimaryKey`

错误原因：XXXMapper.xml 中mapper 标签的namespace 错误
例：<mapper namespace="com.vita.dao.IUserDao">
参考：
mybatis一个怪异的问题: Invalid bound statement not found

.jsp不显示（接收不到）数据（数据已从数据库取到）

解决方案：

在.jsp 上面添加 <%@ page isELIgnored="false" %> （测试可行）

或者修改web.xml ，添加version 版本，如下：（未测试成功）

<?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:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
    id="WebApp_ID" version="3.0" metadata-complete="true">

参考：
SSM框架——Spring+SpringMVC+Mybatis的搭建教程

    原文作者：VitaAin
    原文地址: https://www.jianshu.com/p/393773d51320
    本文转自网络文章，转载此文章仅为分享知识，如有侵权，请联系博主进行删除。

一 下载并安装Eclipse-jee

二 新建Maven项目

三 项目配置文件配置