使用maven搭建ssm框架环境

1.前言

因为经常换环境，在搭ssm框架的时候老是出错，所以记录一下最近搭建的环境，以供参考。

本文讲解如何使用maven搭建ssm框架，并能用于简单的登录注册。

IDE：IDEA，JDK版本：1.8，数据库：mysql5.7  　　启动方式：tomcat

首先创建一个简单的数据库表，用于保存用户名和密码，id是主键，如图：

然后创建一个maven的web工程，先上目录结构：

在java中总共有五个包：

1. controller：放置控制器，在控制层控制逻辑业务跳转的类文件。
2. dao：dao层的接口及其实现类都放在这个包下，其中包含generator逆向生成的类
3. bean：存放generator逆向生成实体类
4. test：使用逆向时需要的测试类
5. service：业务层的接口与实现类放在这个包下，包含具体业务逻辑。

2.maven工程导入依赖

下面是需要在pom.xml文件中添加的依赖，可能部分jar包多余，但是本项目不冲突：

<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.xk</groupId>
  <artifactId>XXXXX</artifactId>
  <packaging>war</packaging>
  <version>0.0.1-SNAPSHOT</version>
  <name>xyspgl Maven Webapp</name>
  <url>http://maven.apache.org</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <!-- spring version -->
    <spring.version>4.3.0.RELEASE</spring.version>
    <mybatis.version>3.3.0</mybatis.version>
  </properties>

  <dependencies>
    <dependency>
      <groupId>org.mybatis.generator</groupId>
      <artifactId>mybatis-generator-core</artifactId>
      <version>1.3.2</version>
    </dependency>

    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>

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

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

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

    <!-- AspectJ Runtime -->
    <dependency>
      <groupId>org.aspectj</groupId>
      <artifactId>aspectjrt</artifactId>
      <version>1.8.6</version>
    </dependency>

    <!-- AspectJ Weaver -->
    <dependency>
      <groupId>org.aspectj</groupId>
      <artifactId>aspectjweaver</artifactId>
      <version>1.8.6</version>
    </dependency>

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

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

    <!-- mysql-connector -->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.38</version>
    </dependency>

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

    <!-- cglib javassist -->
    <dependency>
      <groupId>cglib</groupId>
      <artifactId>cglib</artifactId>
      <version>3.1</version>
    </dependency>
    <dependency>
      <groupId>org.javassist</groupId>
      <artifactId>javassist</artifactId>
      <version>3.17.1-GA</version>
    </dependency>

    <!-- logger -->
    <dependency>
      <groupId>commons-logging</groupId>
      <artifactId>commons-logging</artifactId>
      <version>1.1.1</version>
    </dependency>

    <dependency>
      <groupId>commons-lang</groupId>
      <artifactId>commons-lang</artifactId>
      <version>2.6</version>
    </dependency>


    <dependency>
      <groupId>log4j</groupId>
      <artifactId>log4j</artifactId>
      <version>1.2.17</version>
    </dependency>
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-api</artifactId>
      <version>1.7.5</version>
    </dependency>
    <dependency>
      <groupId>org.apache.logging.log4j</groupId>
      <artifactId>log4j-core</artifactId>
      <version>2.0.2</version>
    </dependency>
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-log4j12</artifactId>
      <version>1.7.5</version>
    </dependency>
    <dependency>
      <groupId>commons-fileupload</groupId>
      <artifactId>commons-fileupload</artifactId>
      <version>1.3</version>
    </dependency>


    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>fastjson</artifactId>
      <version>1.2.24</version>
    </dependency>

    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-databind</artifactId>
      <version>2.5.3</version>
    </dependency>


    <dependency>
      <groupId>org.hibernate</groupId>
      <artifactId>hibernate-validator</artifactId>
      <version>5.0.0.Final</version>
    </dependency>

    <!-- mybatis-spring 整合 -->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>1.2.2</version>
    </dependency>

    <!-- jstl 标签库 -->
    <dependency>
      <groupId>jstl</groupId>
      <artifactId>jstl</artifactId>
      <version>1.2</version>
    </dependency>



    <!-- file upload part -->
    <dependency>
      <groupId>commons-fileupload</groupId>
      <artifactId>commons-fileupload</artifactId>
      <version>1.3</version>
    </dependency>
    <!--分页 -->
    <!-- https://mvnrepository.com/artifact/com.github.pagehelper/pagehelper -->
    <dependency>
      <groupId>com.github.pagehelper</groupId>
      <artifactId>pagehelper</artifactId>
      <version>4.1.4</version>
    </dependency>

    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>4.0.1</version>
      <scope>provided</scope>
    </dependency>



  </dependencies>
  <build>
    <finalName>xyspgl</finalName>
    <!-- 配置编译依赖工具 -->
    <plugins>
      <plugin>
        <!-- https://mvnrepository.com/artifact/org.apache.maven.plugins/maven-compiler-plugin -->
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.8.0</version>
        <configuration>
          <source>1.8</source>
          <target>1.8</target>
          <encoding>UTF8</encoding>
        </configuration>
      </plugin>
    </plugins>
  </build>
</project>

3.配置文件

在src/main/resources下新建几个基本的配置文件：

其中，mapper文件夹存放generator逆向生成的mapper配置文件；

db.properties是放置数据库以及数据池的数据：

driver=com.mysql.jdbc.Driver
#在和mysql传递数据的过程中，使用unicode编码格式，并且字符集设置为utf-8
url=jdbc:mysql://127.0.0.1:3306/ssm?useUnicode=true&characterEncoding=utf-8
user=root
password=root
#password=123456

minIdle=50
maxIdle=45
initialSize=5
maxActive=100
maxWait=100
removeAbandonedTimeout=180
removeAbandoned=true
timeBetweenEvictionRunsMillis=60000
testWhileIdle=true
testOnBorrow=false
testOnReturn=false

log4j.properties是日志的相关配置：

# Global logging configuration
log4j.rootLogger=DEBUG, stdout
# Console output...
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n

ApplicationContext.xml是Spring的配置文件：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:p="http://www.springframework.org/schema/p"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context-4.0.xsd
    http://www.springframework.org/schema/aop
    http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
    http://www.springframework.org/schema/tx
    http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
    http://www.springframework.org/schema/util
    http://www.springframework.org/schema/util/spring-util-4.0.xsd">

    <!--注解扫描-->
    <context:component-scan base-package="itle.service"></context:component-scan>

    <!--数据源连接池-->
    <context:property-placeholder location="classpath:db.properties" />

    <bean id="dataSource"
          class="org.apache.commons.dbcp.BasicDataSource"
          p:driverClassName="${driver}" p:url="${url}" p:username="${user}"
          p:password="${password}" p:minIdle="${minIdle}" p:maxIdle="${maxIdle}"
          p:initialSize="${initialSize}" p:maxActive="${maxActive}"
          p:maxWait="${maxWait}" p:removeAbandoned="${removeAbandoned}"
          p:removeAbandonedTimeout="${removeAbandonedTimeout}"
          p:testOnBorrow="${testOnBorrow}"
          p:testOnReturn="${testOnReturn}"
          p:validationQuery="select 1"
          p:testWhileIdle="${testWhileIdle}"
          p:numTestsPerEvictionRun="${maxActive}"
          p:timeBetweenEvictionRunsMillis="${timeBetweenEvictionRunsMillis}">
    </bean>

    <!--sql的映射文件配置-->
    <bean id="sqlSessionFactory"
          class="org.mybatis.spring.SqlSessionFactoryBean"
          p:dataSource-ref="dataSource"
          p:configLocation="classpath:mybatis-config.xml"
          p:typeAliasesPackage="itle.bean"
          p:mapperLocations="classpath:mapper/UserMapper.xml"></bean>

    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"
          p:basePackage="itle.dao"></bean>


    <!-- 事务管理器 -->
    <bean id="transactionManager"
          class="org.springframework.jdbc.datasource.DataSourceTransactionManager"
          p:dataSource-ref="dataSource">
    </bean>
    <!-- 事务注解的支持 -->
    <tx:annotation-driven
            transaction-manager="transactionManager" />
    </beans>

mybatis-config.xml是mybatis的配置文件：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd" >
<configuration>
    <plugins>
        <plugin interceptor="com.github.pagehelper.PageHelper">
            <property name="pageSizeZero" value="true"/>
            <property name="reasonable" value="true"/></plugin>
    </plugins>
</configuration>

SpringMvc.xml是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:aop="http://www.springframework.org/schema/aop"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:p="http://www.springframework.org/schema/p"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd">
    
    <!-- @Controller注解扫描 -->
    <context:component-scan
            base-package="itle.controller"></context:component-scan>
    
    <!-- 注解驱动:
           替我们显示的配置了最新版的注解的处理器映射器和处理器适配器 -->
    <mvc:annotation-driven ></mvc:annotation-driven>


    <!-- 配置视图解析器
   作用:在controller中指定页面路径的时候就不用写页面的完整路径名称了,可以直接写页面去掉扩展名的名称
   -->
    <!--配多视图解析器 -->
    <bean id="contentNegotiationManager"
          class="org.springframework.web.accept.ContentNegotiationManagerFactoryBean">
        <property name="mediaTypes">
            <map>
                <entry key="html" value="text/html;charset=UTF-8"></entry>
                <entry key="json" value="application/json;charset=UTF-8"></entry>
                <entry key="xml" value="application/xml;charset=UTF-8"></entry>
            </map>
        </property>
        <property name="defaultContentType" value="text/html"></property>
    </bean>

    <bean
            class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">
        <property name="contentNegotiationManager"
                  ref="contentNegotiationManager"></property>
        <property name="viewResolvers">

            <list>
                <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"
                        p:suffix=".jsp"
                        p:prefix="/WEB-INF/jsp/"></bean>
            </list>
        </property>
    </bean>
    
</beans>

接下来是web.xml的全局配置：

<?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" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
  <display-name>ssm3</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>


  <!-- 加载spring容器 -->
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:ApplicationContext*.xml</param-value>
  </context-param>
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>



  <!-- springmvc前端控制器 -->
  <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:SpringMvc.xml</param-value>
    </init-param>
    <!-- 在tomcat启动的时候就加载这个servlet -->
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>springMvc</servlet-name>
    <url-pattern>*.action</url-pattern>
  </servlet-mapping>

  <!--编码设置-->
  <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>

</web-app>

到此，ssm的环境基本算是搭建成功，接下来是要编写java实体代码。

4.Genarator自动构建代码

首先是genarator.xml文件，用于逆向自动生成dao和bean以及mapper的映射文件，需要改动路径的部分都用注释标明，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>
    <context id="testTables" targetRuntime="MyBatis3">
        <commentGenerator>
            <!-- 是否去除自动生成的注释 true：是 ： false:否 -->
            <property name="suppressAllComments" value="true" />
        </commentGenerator>
        <!--数据库连接的信息：驱动类、连接地址、用户名、密码 -->
        <jdbcConnection driverClass="com.mysql.jdbc.Driver"
                        connectionURL="jdbc:mysql://localhost:3306/ssm" userId="root"
                        password="root">
        </jdbcConnection>
        <!-- <jdbcConnection driverClass="oracle.jdbc.OracleDriver"
            connectionURL="jdbc:oracle:thin:@127.0.0.1:1521:yycg"
            userId="yycg"
            password="yycg">
        </jdbcConnection> -->

        <!-- 默认false，把JDBC DECIMAL 和 NUMERIC 类型解析为 Integer，为 true时把JDBC DECIMAL 和
            NUMERIC 类型解析为java.math.BigDecimal -->
        <javaTypeResolver>
            <property name="forceBigDecimals" value="false" />
        </javaTypeResolver>

        <!-- targetProject:指定生成PO类的位置 -->               <!--改#####-->
        <javaModelGenerator targetPackage="itle.bean"
                            targetProject=".srcmainjava">
            <!-- enableSubPackages:是否让schema作为包的后缀 -->
            <property name="enableSubPackages" value="false" />
            <!-- 从数据库返回的值被清理前后的空格 -->
            <property name="trimStrings" value="true" />
        </javaModelGenerator>
        <!-- targetProject:指定sql文件mapper映射文件生成的位置 -->   <!--改#####-->
        <sqlMapGenerator targetPackage="mapper"
                         targetProject=".srcmain
esources">
            <!-- enableSubPackages:是否让schema作为包的后缀 -->
            <property name="enableSubPackages" value="false" />
        </sqlMapGenerator>
        <!-- targetPackage：指定dao接口m生成的位置 -->            <!--改#####-->
        <javaClientGenerator type="XMLMAPPER"
                             targetPackage="itle.dao"
                             targetProject=".srcmainjava">
            <!-- enableSubPackages:是否让schema作为包的后缀 -->
            <property name="enableSubPackages" value="false" />
        </javaClientGenerator>
        <!-- 指定数据库表 -->
        <!--         <table tableName="items"></table> -->
        <table tableName="user"></table>                     <!--改#####-->
        <!--         <table tableName="orderdetail"></table> -->
        <!--         <table tableName="user"></table> -->
        <!-- <table schema="" tableName="sys_user"></table>
        <table schema="" tableName="sys_role"></table>
        <table schema="" tableName="sys_permission"></table>
        <table schema="" tableName="sys_user_role"></table>
        <table schema="" tableName="sys_role_permission"></table> -->

        <!-- 有些表的字段需要指定java类型
         <table schema="" tableName="">
            <columnOverride column="" javaType="" />
        </table> -->
    </context>
</generatorConfiguration>

配置genarator.xml之后要编写测试类编译生成相关配置类，在itle/test中新建一个类StartServer

import java.io.File;

import java.util.ArrayList;
import java.util.List;

import org.mybatis.generator.api.MyBatisGenerator;
import org.mybatis.generator.config.Configuration;
import org.mybatis.generator.config.xml.ConfigurationParser;
import org.mybatis.generator.internal.DefaultShellCallback;

//逆向生成映射文件
public class StartServer {

    public void generator() throws Exception{
        List<String> warnings = new ArrayList<String>();
        boolean overwrite = true;
        File configFile = new File("src\main\resources\genarator.xml");
        ConfigurationParser cp = new ConfigurationParser(warnings);
        Configuration config = cp.parseConfiguration(configFile);
        DefaultShellCallback callback = new DefaultShellCallback(overwrite);
        MyBatisGenerator myBatisGenerator = new MyBatisGenerator(config,
                callback, warnings);
        myBatisGenerator.generate(null);
    }

    public static void main(String[] args) throws Exception {
        try {
            StartServer startServer = new StartServer();
            startServer.generator();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

运行这段代码，刷新项目，会dao、bean、mapper三个包中生成相应类，所以这3个包我们是不需要去管的。

5.编写业务层

在service包下新建一个接口 IUserService

import java.util.List;

import itle.bean.User;

public interface IUserService {

    public boolean findUserByNameAndPwd(User user) throws Exception;

    public boolean register(User user) throws Exception;
}

再新建一个相应的实现类 UserServiceImpl

import java.util.List;

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

import itle.dao.UserMapper;
import itle.bean.User;
import itle.bean.UserExample;

@Service
public class UserServiceImpl implements IUserService {

    @Autowired
    private UserMapper userMapper;

    //根据对象查询
    public boolean findUserByNameAndPwd(User user) throws Exception {
        UserExample example = new UserExample();

        List<User> list = userMapper.selectByExample(example);
        for(User u:list) {
            if(u.getUsername().equals(user.getUsername())&&
                    u.getUserpwd().equals(user.getUserpwd())) {
                return true;
            }
        }
        return false;
    }


    //插入一个对象的数据
    public boolean register(User user) throws Exception {
        int i = userMapper.insertSelective(user);
        if(i>0) {
            return true;
        }
        return false;
    }

}

6.编写控制层

在controller包中新建一个类 UserCtroller

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

import itle.bean.User;
import itle.service.IUserService;

@Controller
public class UserCtroller {

    @Autowired
    private IUserService userService;

    //登录
    @RequestMapping("/login")
    public String loginqw(User user) throws Exception{

        if(userService.findUserByNameAndPwd(user)) {
            return "success";
        }
        return "login";
    }

    @RequestMapping("/indexReg")
    public String indexreg() {
        return "register";
    }

    @RequestMapping("/index")
    public String indexLog() {
        return "login";
    }


    //注册
    @RequestMapping("/reg")
    public String register(User user) throws Exception{
        if(userService.register(user)) {
            return "success";
        }
        return "register";
    }

}

7.jsp页面

需要用于登陆注册的页面

在webapp/WEB-INF下新建一个jsp文件夹，用于管理jsp页面，在文件夹下新建login.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
         pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>Insert title here</title>
</head>
<body>
<h2>登录页面</h2>
<form action="login.action" method="post">
    用户名：<input type="text" name="username" /><br/>
    密码：<input type="password" name="userpwd" /><br/>
    <input type="submit" value="登录" />
    <a href="indexReg.action">去注册</a>
</form>

</body>
</html>

再新建一个register.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
         pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>Insert title here</title>
</head>
<body>
<h2>注册页面</h2>
<form action="reg.action" method="post">
    用户名：<input type="text" name="username" /><br/>
    密码：<input type="password" name="userpwd" /><br/>
    <input type="submit" value="注册" />
    <a href="index.action">去登录</a>
</form>
</body>
</html>

还有一个登陆成功后跳转的主页 success.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
         pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>Insert title here</title>
</head>
<body>
<h2>成功！</h2>
</body>
</html>

8.测试

运行成功！截图如下：