Spring+SpringMVC+Mybatis(开发必备技能)01基础idea环境配置

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Spring+SpringMVC+Mybatis(开发必备技能)

01、基础idea环境配置

环境:

数据库:mysql

开发工具:IntelliJ IDEA 2020.1.3 x64

框架:SSM(Spring+SpringMVC+Mybatis)

目录

1、创建idea的maven项目

2、引入maven所需要的所有包

3、包解释:

Spring需要的包:

Mybatis需要的包: 

jsp与servlet需要的包:

数据库连接池DBCP:

Json:

JDBC组件:

分页:

复杂sql处理:

4、创建资源文件夹:

5、创建数据库链接在资源文件【jdbc.properties】

​编辑

6、在【resources】下创建【mapper】文件夹与【UsersMapper.xml】测试类文件

​编辑

7、Spring配置文件【applicationContext.xml】的创建

8、spring-mvc配置文件spring-mvc.xml配置

9、创建各层级【模型层model】、【数据层dao】、【控制器controller】、【业务逻辑接口层service】、【业务逻辑实现层serviceimpl】、【视图层resources/webapp/views】

10、webapp下【WEB-INF/web.xml】配置

11、创建测试数据库(也可以直接用我的,连接不变即可)

12、完成各层级编码(具体注解与逻辑下篇文章具体讲解)

【模型层Users】

【数据层UsersMapper】

【业务逻辑接口层UsersService】

【业务逻辑实现层UsersServiceImpl】

【控制层UsersController】

【视图层GetInfo.jsp】

13、配置Tomcat

14、启动测试

15、接口访问测试


1、创建idea的maven项目

写上项目名称,点击【Next】

选择maven路径

2、引入maven所需要的所有包

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>4.3.18.RELEASE</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.springframework/spring-core -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-core</artifactId>
      <version>4.3.18.RELEASE</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.springframework/spring-beans -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-beans</artifactId>
      <version>4.3.18.RELEASE</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.springframework/spring-web -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-web</artifactId>
      <version>4.3.18.RELEASE</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>4.3.18.RELEASE</version>
    </dependency>
    <!--mybatis所需要的包-->
    <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis -->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>3.4.6</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.38</version>
    </dependency>

    <!--数据库事务管理-->
    <!-- Spring提供了两种使用JDBC API的最佳实践,
    一种是以JdbcTemplate为核心的基于Template的JDBC的使用方式,
    另一种则是在JdbcTemplate基础之上的构建的基于操作对象的JDBC的使用方式。 -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>4.3.18.RELEASE</version>
    </dependency>

    <!-- Spring-tx模块负责在spring框架中实现事务管理功能。以aop切面的方式将事务注入到业务代码中,并实现不同类型的事务管理器。 -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-tx</artifactId>
      <version>4.3.18.RELEASE</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis-spring -->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>1.3.2</version>
    </dependency>

    <!--由于为了方便api接口与本地服务的jsp页面所以也要引入jsp包(用作考试的也一样,方便)-->
    <!-- https://mvnrepository.com/artifact/javax.servlet/jstl -->
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>jstl</artifactId>
      <version>1.2</version>
    </dependency>

    <!-- 这里是servlet的api服务Tomcat要用到 -->
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>3.1.0</version>
      <scope>provided</scope>
    </dependency>

    <!-- DBCP是Java的数据库连接池 -->
    <dependency>
      <groupId>commons-dbcp</groupId>
      <artifactId>commons-dbcp</artifactId>
      <version>1.4</version>
    </dependency>
    <!--json-->
    <!-- fastjson是一个性能很好的Java语言实现的json解析器和生成器,来自阿里巴巴的工程师开发。是谁就不知道了。 -->
    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>fastjson</artifactId>
      <version>1.2.47</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind -->
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-databind</artifactId>
      <version>2.12.2</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-core -->
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-core</artifactId>
      <version>2.12.2</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-annotations -->
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-annotations</artifactId>
      <version>2.12.2</version>
    </dependency>
    <!-- JDBC组件 -->
    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>druid</artifactId>
      <version>1.1.10</version>
    </dependency>
    <!--Java语言中最好的数据库连接池,Druid能够提供强大的监控和扩展功能。
    spring boot starter自动装配组件,简化组件引入的开发工作量,
    所以Druid推出了druid-spring-boot-starter-->
    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>druid-spring-boot-starter</artifactId>
      <version>1.1.10</version>
    </dependency>
    <!-- 分页会用到 -->
    <dependency>
      <groupId>com.github.pagehelper</groupId>
      <artifactId>pagehelper</artifactId>
      <version>5.2.0</version>
    </dependency>
    <!-- 处理sql的 -->
    <dependency>
      <groupId>com.github.jsqlparser</groupId>
      <artifactId>jsqlparser</artifactId>
      <version>4.0</version>
    </dependency>

粘贴位置: 

3、包解释:

Spring需要的包:

  <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>4.3.18.RELEASE</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.springframework/spring-core -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-core</artifactId>
      <version>4.3.18.RELEASE</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.springframework/spring-beans -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-beans</artifactId>
      <version>4.3.18.RELEASE</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.springframework/spring-web -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-web</artifactId>
      <version>4.3.18.RELEASE</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>4.3.18.RELEASE</version>
    </dependency>

Mybatis需要的包: 

<!--mybatis所需要的包-->
<!-- https://mvnrepository.com/artifact/org.mybatis/mybatis -->
<dependency>
  <groupId>org.mybatis</groupId>
  <artifactId>mybatis</artifactId>
  <version>3.4.6</version>
</dependency>
<!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
<dependency>
  <groupId>mysql</groupId>
  <artifactId>mysql-connector-java</artifactId>
  <version>5.1.38</version>
</dependency>
<!--数据库事务管理-->
<!-- Spring提供了两种使用JDBC API的最佳实践,
一种是以JdbcTemplate为核心的基于Template的JDBC的使用方式,
另一种则是在JdbcTemplate基础之上的构建的基于操作对象的JDBC的使用方式。 -->
<dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-jdbc</artifactId>
  <version>4.3.18.RELEASE</version>
</dependency>
<!-- Spring-tx模块负责在spring框架中实现事务管理功能。以aop切面的方式将事务注入到业务代码中,并实现不同类型的事务管理器。 -->
<dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-tx</artifactId>
  <version>4.3.18.RELEASE</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.mybatis/mybatis-spring -->
<dependency>
  <groupId>org.mybatis</groupId>
  <artifactId>mybatis-spring</artifactId>
  <version>1.3.2</version>
</dependency>

jsp与servlet需要的包:

<!--由于为了方便api接口与本地服务的jsp页面所以也要引入jsp包(用作考试的也一样,方便)-->
<!-- https://mvnrepository.com/artifact/javax.servlet/jstl -->
<dependency>
  <groupId>javax.servlet</groupId>
  <artifactId>jstl</artifactId>
  <version>1.2</version>
</dependency>
<!-- 这里是servlet的api服务Tomcat要用到 -->
<dependency>
  <groupId>javax.servlet</groupId>
  <artifactId>javax.servlet-api</artifactId>
  <version>3.1.0</version>
  <scope>provided</scope>
</dependency>

数据库连接池DBCP:

<!-- DBCP是Java的数据库连接池 -->
<dependency>
  <groupId>commons-dbcp</groupId>
  <artifactId>commons-dbcp</artifactId>
  <version>1.4</version>
</dependency>

Json:

<!--json-->
<!-- fastjson是一个性能很好的Java语言实现的json解析器和生成器,来自阿里巴巴的工程师开发。是谁就不知道了。 -->
<dependency>
  <groupId>com.alibaba</groupId>
  <artifactId>fastjson</artifactId>
  <version>1.2.47</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind -->
<dependency>
  <groupId>com.fasterxml.jackson.core</groupId>
  <artifactId>jackson-databind</artifactId>
  <version>2.12.2</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-core -->
<dependency>
  <groupId>com.fasterxml.jackson.core</groupId>
  <artifactId>jackson-core</artifactId>
  <version>2.12.2</version>
</dependency>
<dependency>
  <groupId>com.fasterxml.jackson.core</groupId>
  <artifactId>jackson-annotations</artifactId>
  <version>2.12.2</version>
</dependency>

JDBC组件:

<!-- JDBC组件 -->
<dependency>
  <groupId>com.alibaba</groupId>
  <artifactId>druid</artifactId>
  <version>1.1.10</version>
</dependency>
<!--Java语言中最好的数据库连接池,Druid能够提供强大的监控和扩展功能。
spring boot starter自动装配组件,简化组件引入的开发工作量,
所以Druid推出了druid-spring-boot-starter-->
<dependency>
  <groupId>com.alibaba</groupId>
  <artifactId>druid-spring-boot-starter</artifactId>
  <version>1.1.10</version>
</dependency>

分页:

<!-- 分页会用到 -->
<dependency>
  <groupId>com.github.pagehelper</groupI
  <artifactId>pagehelper</artifactId>
  <version>5.2.0</version>
</dependency>

复杂sql处理:

<!-- 处理sql的 -->
<dependency>
  <groupId>com.github.jsqlparser</groupId>
  <artifactId>jsqlparser</artifactId>
  <version>4.0</version>
</dependency>

4、创建资源文件夹:

打开项目层级,看到包已经下载好了,并引入成功,但是【src】下只有webapp,所以需要鼠标右键创建需要的4个文件夹。

在【src】上点击鼠标右键,创建四个文件夹:

全选并回车创建

 项目层级:

5、创建数据库链接在资源文件【jdbc.properties】

driver=com.mysql.jdbc.Driver
url=jdbc:mysql://rm-bp1zq3879r28p726lco.mysql.rds.aliyuncs.com:3306/test?characterEncoding=utf8
username=qwe8403000
password=Qwe8403000
#下面在有需要配置就行,没有需要不用记那么多,用的话过来复制
#初始化链接数量
initialSize=0
#最大连接数,一般20够测试了
maxActive=20
#最多多少空闲在
maxIdle=20
#最少多少空闲在
minIdle=1
#最大等待时间
maxWait=60000

6、在【resources】下创建【mapper】文件夹与【UsersMapper.xml】测试类文件

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.item.dao.UsersMapper">
    <!-- 用作基础查询测试 -->
    <select id="GetInfo" resultType="Users">
        select * from users
    </select>
    <!-- 用做传递参数测试 -->
    <select id="SelectName" resultType="Users">
        select * from users where nickName like "%$nickName%"
    </select>
</mapper>

7、Spring配置文件【applicationContext.xml】的创建

配置文件: (有详细的注解)

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns="http://www.springframework.org/schema/beans"
       xmlns:p="http://www.springframework.org/schema/p"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
                        http://www.springframework.org/schema/beans/spring-beans-4.2.xsd
                        http://www.springframework.org/schema/context
                        http://www.springframework.org/schema/context/spring-context-4.2.xsd
                        http://www.springframework.org/schema/aop
                        http://www.springframework.org/schema/aop/spring-aop-4.2.xsd
                        http://www.springframework.org/schema/tx
                        http://www.springframework.org/schema/tx/spring-tx-4.2.xsd">

    <!-- 加载properties文件·就是刚才写数据库连接信息的文件 -->
    <bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="location" value="classpath:jdbc.properties"/>
    </bean>
    <!-- 配置数据源·你要连接的数据库,为了方便大家,我弄了个一年的数据库,免费使用,但是连接数只有20,别太拥挤 -->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="driverClassName" value="$driver"/>
        <property name="url" value="$url"/>
        <property name="username" value="$username"/>
        <property name="password" value="$password"/>
    </bean>

    <!-- spring包里封装了有mybatis的SqlSessionFactoryBean工厂,直接用就行 -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <!-- 获取model包下的模型,这里可能命名不同,entity或者pojo都是,也可能叫javabean -->
        <property name="typeAliasesPackage" value="com.item.model"/>
        <!-- 获取映射的xml文件,其中*代表所有 -->
        <property name="mapperLocations" value="classpath:mapper/*.xml"/>
    </bean>

    <!-- 数据库工厂直接获取dao层的mapper,也就是将mapper的接口内容拿到 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!-- 这里可以理解成依赖注入sqlSessionFactory -->
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
        <!-- dao层的位置 -->
        <property name="basePackage" value="com.item.dao"/>
    </bean>

    <!-- 事务管理,这就不废话了 -->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <!--数据库连接池-->
        <property name="dataSource" ref="dataSource"/>
    </bean>
</beans>

8、spring-mvc配置文件spring-mvc.xml配置

配置编码: 

<?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
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context.xsd
       http://www.springframework.org/schema/mvc
       http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">
    <!-- 获取item下在所有上下文内容,自己些项目在时候注意改名 -->
    <context:component-scan base-package="com.item"/>
    <!-- 开注解 -->
    <mvc:annotation-driven/>
    <!-- 用于views层处理静态资源 -->
    <mvc:default-servlet-handler/>
    <!-- 处理返回试图的后缀,自己看好路径啊。我自己创建了一个【views】文件夹,里面放所有的视图文件 -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
        <property name="prefix" value="/views/"/>
        <property name="suffix" value=".jsp"/>
    </bean>
</beans>

9、创建各层级【模型层model】、【数据层dao】、【控制器controller】、【业务逻辑接口层service】、【业务逻辑实现层serviceimpl】、【视图层resources/webapp/views】

当前所有的层级以及包名,还差一个webapp下【WEB-INF/web.xml】没配置。

10、webapp下【WEB-INF/web.xml】配置

替换配置

<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
         version="3.1">

  <display-name>demo_515</display-name>
  <!--初始访问页面-->
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>

  <!-- ServletContext监听 -->
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>

  <!-- spring核心 -->
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:applicationContext.xml</param-value>
  </context-param>
  <!-- 格式化编码格式的,免得req和resp配置 -->
  <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>

  <!-- 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:spring-mvc.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
    <async-supported>true</async-supported>
  </servlet>

  <servlet-mapping>
    <servlet-name>springmvc</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>

</web-app>

替换效果:(注释写在的相对好理解,不理解的留言) 

11、创建测试数据库(也可以直接用我的,连接不变即可)

/*
 Navicat Premium Data Transfer

 Source Server         : myALi
 Source Server Type    : MySQL
 Source Server Version : 50732
 Source Host           : rm-bp1zq3879r28p726lco.mysql.rds.aliyuncs.com:3306
 Source Schema         : test

 Target Server Type    : MySQL
 Target Server Version : 50732
 File Encoding         : 65001

 Date: 24/05/2022 21:59:06
*/

SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;

-- ----------------------------
-- Table structure for users
-- ----------------------------
DROP TABLE IF EXISTS `users`;
CREATE TABLE `users`  (
  `id` int(11) NOT NULL AUTO_INCREMENT COMMENT '序号',
  `userName` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '用户账号',
  `pwd` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '用户密码',
  `nickName` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '用户姓名',
  PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 6 CHARACTER SET = utf8 COLLATE = utf8_general_ci COMMENT = '用户信息表\\r\\n\\r\\n这个表是用来记录用户的基础信息\\r\\n\\r\\n' ROW_FORMAT = Dynamic;

-- ----------------------------
-- Records of users
-- ----------------------------
INSERT INTO `users` VALUES (1, '文日红', '123456', '有一姑娘,清扬婉兮。');
INSERT INTO `users` VALUES (2, '杨春红', '1234657', '灿如春华,皎若明月');
INSERT INTO `users` VALUES (3, '顾容菲', '123', '二九年华,娉婷姌嫋。');
INSERT INTO `users` VALUES (4, '韦文静', '1234', '明眸善睐,靥辅承权,瑰姿艳逸,仪静体闲。');
INSERT INTO `users` VALUES (5, '卢雪', '12345', '落落大方,英姿飒爽。');

SET FOREIGN_KEY_CHECKS = 1;

12、完成各层级编码(具体注解与逻辑下篇文章具体讲解)

需要5个文件,依次是【模型层Users】、【数据层UsersMapper】、【业务逻辑接口层UsersService】、【业务逻辑实现层UsersServiceImpl】、【控制层UsersController】、【视图层GetInfo.jsp】顺序如果错了回看到层层报错,将所有文件编写完才能不报红,所以建议按照顺序来。

【模型层Users】

package com.item.model;

public class Users 

    public int getId() 
        return id;
    

    public void setId(int id) 
        this.id = id;
    

    public String getUserName() 
        return userName;
    

    public void setUserName(String userName) 
        this.userName = userName;
    

    public String getPwd() 
        return pwd;
    

    public void setPwd(String pwd) 
        this.pwd = pwd;
    

    public String getNickName() 
        return nickName;
    

    public void setNickName(String nickName) 
        this.nickName = nickName;
    

    @Override
    public String toString() 
        return "Users" +
                "id=" + id +
                ", userName='" + userName + '\\'' +
                ", pwd='" + pwd + '\\'' +
                ", nickName='" + nickName + '\\'' +
                '';
    

    private int id;
    private String userName;
    private String pwd;
    private String nickName;


【数据层UsersMapper】

package com.item.dao;

import com.item.model.Users;
import org.apache.ibatis.annotations.Param;

import java.util.List;

public interface UsersMapper 
    List<Users> GetInfo();
    List<Users> SelectName(@Param("nickName") String nickName);

【业务逻辑接口层UsersService】

package com.item.service;

import com.item.model.Users;
import java.util.List;

public interface UsersService 
    List<Users> GetInfo();
    List<Users> SelectName(String nickName);

【业务逻辑实现层UsersServiceImpl】

package com.item.serviceimpl;

import com.item.dao.UsersMapper;
import com.item.model.Users;
import com.item.service.UsersService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class UsersServiceImpl implements UsersService 
    @Autowired
    private UsersMapper usersMapper;

    @Override
    public List<Users> GetInfo() 
        return usersMapper.GetInfo();
    

    @Override
    public List<Users> SelectName(String nickName) 
        return usersMapper.SelectName(nickName);
    

【控制层UsersController】

package com.item.controller;

import com.item.model.Users;
import com.item.service.UsersService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import javax.servlet.http.HttpServletRequest;
import java.util.List;

@Controller
@CrossOrigin
public class UsersController 
    @Autowired
    private UsersService usersService;

    @RequestMapping("/GetInfoApi")
    @ResponseBody
    public Object GetInfoApi()
        List<Users> list=usersService.GetInfo();
        System.out.println(list);
        return list;
    
    @RequestMapping("/GetInfo")
    public String GetInfo(HttpServletRequest request,Model model)
        List<Users> list=usersService.GetInfo();
        model.addAttribute("lists",list);
        return "GetInfo";
    

    @RequestMapping("/GetName")
    public String GetName(HttpServletRequest request,Model model)
        String nickName = request.getParameter("nickName");
        List<Users> list=usersService.SelectName(nickName);
        model.addAttribute("lists",list);
        return "GetInfo";
    

【视图层GetInfo.jsp】

<%@ page import="java.util.List" %>
<%@ page import="com.item.model.Users" %><%--
<%--
  Created by IntelliJ IDEA.
  User: Administrator
  Date: 2022/5/24 0024
  Time: 22:08
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
    <link rel="stylesheet" href="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/css/bootstrap.min.css">
</head>
<body>
<form action="/GetName" method="get">
    <input type="text" placeholder="输入昵称查询" name="nickName"/>
    <input type="submit" value="提交" class="btn btn-primary"/>
</form>
<% List<Users> lists = (List<Users>) request.getAttribute("lists");%>
<table class="table table-bordered table-hover table-striped">
    <tr class="info">
        <th>编号</th>
        <th>账号</th>
        <th>密码</th>
        <th>昵称</th>
    </tr>
    <%
        for (Users u : lists) 
    %>
    <tr>
        <td><%=u.getId()%></td>
        <td><%=u.getUserName()%></td>
        <td><%=u.getPwd()%></td>
        <td><%=u.getNickName()%></td>
    </tr>
    <%
        
    %>
</table>
</body>
</html>

13、配置Tomcat

去掉麻烦的路径:

14、启动测试

看到successfully,并且启动中没有错误提示代表启动成功。

15、接口访问测试

基本路径:【http://localhost:8088/

 api接口路径:【http://localhost:8088/GetInfoApi

视图路径:【http://localhost:8088/GetInfo

跨域测试(编码如下):

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="https://code.jquery.com/jquery-3.4.0.min.js"></script>
</head>

<body>
    <button onclick="ontest()">测试</button>
    <script>
        function ontest() 
            $.ajax(
                url: "http://127.0.0.1:8088/GetInfoApi",
                type: "get",
                success: function(data) 
                    console.log(data);
                
            );
        
    </script>
</body>

</html>

自行创建一个【index.html】用作测试: 

打开后,F12,看控制台【Console】,点击一下【测试】按钮即可看到数据。

希望能给大家带来帮助,欢迎一键三连哦。

开发者涨薪指南 48位大咖的思考法则、工作方式、逻辑体系

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