5、spring+springmvc+mybatis整合
5.1、项目技术需求分析
1.使用ssm+layui技术开发 对用户表数据实现增删改查
采用前后端分离架构模式
5.2、SSM环境的整合之提供增删改查
整合数据库表结构
CREATE TABLE `mayikt_users` (`id` int NOT NULL AUTO_INCREMENT,`name` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL,`age` int DEFAULT NULL,`addres` varchar(255) DEFAULT NULL,PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=48 DEFAULT CHARSET=utf8mb3;
整合maven依赖
spring/springmvc/mybatis
<?xml version="1.0" encoding="UTF-8"?><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/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><groupId>com.mayikt</groupId><artifactId>mayikt-ssm02</artifactId><version>1.0-SNAPSHOT</version><packaging>war</packaging><name>mayikt-ssm02 Maven Webapp</name><!-- FIXME change it to the project's website --><url>http://www.example.com</url><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><maven.compiler.source>1.7</maven.compiler.source><maven.compiler.target>1.7</maven.compiler.target></properties><dependencies><!--整合springmvc --><dependency><groupId>org.springframework</groupId><artifactId>spring-webmvc</artifactId><version>5.2.10.RELEASE</version></dependency><!--整合mybatis --><dependency><groupId>org.mybatis</groupId><artifactId>mybatis</artifactId><version>3.5.6</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-jdbc</artifactId><version>5.2.10.RELEASE</version></dependency><dependency><groupId>org.mybatis</groupId><artifactId>mybatis-spring</artifactId><version>1.3.0</version></dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>8.0.13</version></dependency><!--使用alibaba数据源 --><dependency><groupId>com.alibaba</groupId><artifactId>druid</artifactId><version>1.1.16</version></dependency><dependency><groupId>javax.servlet</groupId><artifactId>javax.servlet-api</artifactId><version>3.1.0</version><scope>provided</scope></dependency><!--使用@ResponseBody 能够响应数据 --><dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-databind</artifactId><version>2.9.0</version></dependency></dependencies><build><plugins><plugin><groupId>org.apache.tomcat.maven</groupId><artifactId>tomcat7-maven-plugin</artifactId><version>2.1</version><configuration><port>80</port><path>/</path></configuration></plugin></plugins></build></project>
实体类层
com.mayikt.entity
数据库访问层
com.mayikt.mapper
业务逻辑层
com.mayikt.service
控制层
com.mayikt.controller
5.3、SSM环境的整合之配置整合
JdbcConfig
package com.mayikt.config;import com.alibaba.druid.pool.DruidDataSource;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import org.springframework.transaction.PlatformTransactionManager;import javax.sql.DataSource;public class JdbcConfig {/*** 定义数据源配置** @return*/@Beanpublic DataSource dataSource() {DruidDataSource druidDataSource = new DruidDataSource();druidDataSource.setDriverClassName("com.mysql.jdbc.Driver");druidDataSource.setUrl("jdbc:mysql://localhost:3306/mayikt?useSSL=false&useUnicode=true&characterEncoding=UTF-8&serverTimezone=GMT");druidDataSource.setUsername("root");druidDataSource.setPassword("root");return druidDataSource;}/*** 整合事务** @param dataSource* @return*/@Beanpublic PlatformTransactionManager platformTransactionManager(@Autowired DataSource dataSource) {DataSourceTransactionManager dataSourceTransactionManager =new DataSourceTransactionManager();dataSourceTransactionManager.setDataSource(dataSource);return dataSourceTransactionManager;}
}
MybatisConfig
package com.mayikt.config;import org.mybatis.spring.SqlSessionFactoryBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;import javax.sql.DataSource;public class MybatisConfig {/*** mybatis相关配置** @param dataSource* @return*/@Beanpublic SqlSessionFactoryBean sqlSessionFactory(@Autowired DataSource dataSource) {SqlSessionFactoryBean sqlSessionFactoryBean =new SqlSessionFactoryBean();sqlSessionFactoryBean.setDataSource(dataSource);// 实体层包sqlSessionFactoryBean.setTypeAliasesPackage("com.mayikt.entity");return sqlSessionFactoryBean;}}
SpringConfig
package com.mayikt.config;import org.mybatis.spring.annotation.MapperScan;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.FilterType;
import org.springframework.context.annotation.Import;
import org.springframework.stereotype.Controller;
import org.springframework.transaction.annotation.EnableTransactionManagement;@Configuration
@ComponentScan({"com.mayikt.service"})
//开启事务
@EnableTransactionManagement
@Import({MybatisConfig.class, JdbcConfig.class})
@MapperScan("com.mayikt.mapper")
public class SpringConfig {
}
SpringMVCConfig
package com.mayikt.config;import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;@EnableWebMvc
@Configuration
@ComponentScan("com.mayikt.controller")
public class SpringMVCConfig {
}
ServletConfig
package com.mayikt.config;import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;public class ServletConfig extends AbstractAnnotationConfigDispatcherServletInitializer {protected Class<?>[] getRootConfigClasses() {return new Class[]{SpringConfig.class};}protected Class<?>[] getServletConfigClasses() {return new Class[]{SpringMVCConfig.class};}protected String[] getServletMappings() {return new String[]{"/"};}
}
5.4、接口响应状态码
统一规范返回数据的格式,此处以json格式为例。返回数据应包含:返回状态码、返回状态信息、具体数据。
格式规范如下:
{"code":"200","msg":"ok","data": {//json格式的具体数据}
}
查询到数据
{"code":"200","msg":"ok","data": {"userName":"mayikt","age":22}
}
前端 ajax技术
if(code==200){
"data": {
"userName":"mayikt",
"age":22
}
}
没有查询到数据
{"code":"500","msg":"fail","data": {}
}
新增数据
{"code":"500","msg":"插入失败","data": {}
}
前端:
if(code==200){
alert(" "msg":"插入成功"")
}
Api Code状态码
1** | 服务器收到请求,需要请求者继续执行操作 |
2** | 操作被成功接收并处理 |
3** | 重定向,需要进一步的操作以完成请求 |
4** | 客户端错误,请求包含语法错误或无法完成请求 |
5** | 服务器错误,服务器在处理请求的过程中发生了错误 |
如何封装接口响应状态码
package com.mayikt.controller;import java.util.HashMap;public class BaseController {/*** 提供处理请求响应成功的情况下** @param data* @return*/public HashMap<String, Object> setResultOk(Object data) {return setResult(200, "ok", data);}public HashMap<String, Object> setResultSuccess(String msg) {return setResult(200, msg, null);}/*** 提供处理请求失败情况下** @param msg* @return*/public HashMap<String, Object> setResultError(String msg) {return setResult(500, msg, null);}/*** @param code code 200 处理成功 500 处理失败* @param msg 响应错误内容* @param data 响应的数据* @return*/public HashMap<String, Object> setResult(Integer code, String msg, Object data) {HashMap<String, Object> result = new HashMap<>();result.put("code", code);result.put("msg", msg);result.put("data", data);return result;}
}
5.5、整合全局捕获异常
当系统发生错误时,统一将系统错误日志 返回输出
package com.mayikt.controller;import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseBody;import javax.servlet.http.HttpServletRequest;
import java.util.Map;@ControllerAdvice
public class GlobalExceptionHandler extends BaseController {@ResponseBody@ExceptionHandler(value = Exception.class)public Map<String, Object> handleException(HttpServletRequest h, Exception e) {System.out.println("自定义异常:" + e);return setResultError("系统发生了错误!");}
}