[转]SSM(Spring+SpringMVC+Mybatis)框架搭建详细教程【附源代码Demo】
一、新建项目
运行IDEA,进入初始化界面,然后我们选择新建项目(进入主界面新建项目也是一样的)
在Maven选项卡里面找到对应的java web选项,然后我们点下一步
这一步填入组织等信息,这里比较随意,按照自己的需求进行填写,然后下一步
这里我早已配置好本地Maven仓库,因此直接默认即可。如果没进行配置本地默认仓库的话,请网上查找对应的资料进行配置
输入Project name,和需要保存的路径,然后finish
去泡一杯咖啡吧,这里需要一小段时间哦~
稍等片刻,idea已经为我们自动建好了一切。到这里,我们的第一步,新建项目阶段已经完成,欢庆一下,进入下一个阶段。
新建好项目后,我们首先打开SSM_Demo,修改一下JDK版本。
在settings里面对项目版本进行修改:
原来是1_5,现在改为1_8,可能会存在spring等框架版本和jdk版本不兼容问题,因此,提前升级了版本。
二、目录结构调整
首先我们配置Maven的项目结构,选择Project Structure
选择Modules标签页,然后新建并标识对应的项目结构
最终的文件结构如下所示:
- Java为主Java代码文件夹
- Controllers 控制器文件文件夹
- Dao (数据访问)层文件夹
- Service(业务逻辑)层文件夹
- Entity(实体)层文件夹
- resources资源文件夹
- mapper mybatis sql文件夹
- webapp web页面文件夹
- Test 测试文件夹
三、Maven包的初始化
Maven是采用配置文件的方式进行jar包的自动导入,因此,我们需要进行对配置文件的修改来进行jar包的导入。
打开pom.xml文件
添加我们将会用到的一系列jar包配置(这里将我的配置直接复制过来,作为参考)
1 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 2 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd"> 3 <modelVersion>4.0.0</modelVersion> 4 <groupId>QX_JFrame</groupId> 5 <artifactId>Demo</artifactId> 6 <packaging>war</packaging> 7 <version>1.0-SNAPSHOT</version> 8 <name>Demo Maven Webapp</name> 9 <url>http://maven.apache.org</url> 10 <dependencies> 11 <!--Unit Test - 单元测试--> 12 <dependency> 13 <groupId>junit</groupId> 14 <artifactId>junit</artifactId> 15 <version>4.12</version> 17 </dependency> 18 <!--Spring--> 19 <dependency> 20 <groupId>org.springframework</groupId> 21 <artifactId>spring-core</artifactId> 22 <version>4.3.5.RELEASE</version> 23 </dependency> 24 <dependency> 25 <groupId>org.springframework</groupId> 26 <artifactId>spring-aop</artifactId> 27 <version>4.3.5.RELEASE</version> 28 </dependency> 29 <dependency> 30 <groupId>org.springframework</groupId> 31 <artifactId>spring-orm</artifactId> 32 <version>4.3.5.RELEASE</version> 33 </dependency> 34 <!--Spring transaction--> 35 <dependency> 36 <groupId>org.springframework</groupId> 37 <artifactId>spring-tx</artifactId> 38 <version>4.3.5.RELEASE</version> 39 </dependency> 40 <dependency> 41 <groupId>org.springframework</groupId> 42 <artifactId>spring-test</artifactId> 43 <version>4.3.5.RELEASE</version> 44 </dependency> 45 <dependency> 46 <groupId>org.springframework</groupId> 47 <artifactId>spring-mock</artifactId> 48 <version>2.0.8</version> 49 </dependency> 50 <dependency> 51 <groupId>org.springframework</groupId> 52 <artifactId>spring-jdbc</artifactId> 53 <version>4.3.5.RELEASE</version> 54 </dependency> 55 <dependency> 56 <groupId>org.springframework</groupId> 57 <artifactId>spring-context</artifactId> 58 <version>4.3.5.RELEASE</version> 59 </dependency> 60 <dependency> 61 <groupId>org.springframework</groupId> 62 <artifactId>spring-context-support</artifactId> 63 <version>4.3.5.RELEASE</version> 64 </dependency> 65 <dependency> 66 <groupId>org.springframework</groupId> 67 <artifactId>spring-expression</artifactId> 68 <version>4.3.5.RELEASE</version> 69 </dependency> 70 <!--Spring Web + Spring MVC--> 71 <dependency> 72 <groupId>org.springframework</groupId> 73 <artifactId>spring-web</artifactId> 74 <version>4.3.1.RELEASE</version> 75 </dependency> 76 <dependency> 77 <groupId>org.springframework</groupId> 78 <artifactId>spring-webmvc</artifactId> 79 <version>4.3.1.RELEASE</version> 80 </dependency> 81 82 <dependency> 83 <groupId>com.github.pagehelper</groupId> 84 <artifactId>pagehelper</artifactId> 85 <version>3.7.3</version> 86 </dependency> 87 <dependency> 88 <groupId>com.github.jsqlparser</groupId> 89 <artifactId>jsqlparser</artifactId> 90 <version>0.9.1</version> 91 </dependency> 92 <!--mysql jdbc--> 93 <dependency> 94 <groupId>mysql</groupId> 95 <artifactId>mysql-connector-java</artifactId> 96 <version>5.1.38</version> 97 </dependency> 98 <!--c3p0--> 99 <dependency> 100 <groupId>c3p0</groupId> 101 <artifactId>c3p0</artifactId> 102 <version>0.9.1.2</version> 103 </dependency> 104 <!--NoClassDefFoundError: javax/servlet/jsp/jstl/core/Config--> 105 <!-- https://mvnrepository.com/artifact/jstl/jstl --> 106 <dependency> 107 <groupId>jstl</groupId> 108 <artifactId>jstl</artifactId> 109 <version>1.2</version> 110 </dependency> 111 <!--file upload jar package--> 112 <!-- https://mvnrepository.com/artifact/commons-fileupload/commons-fileupload --> 113 <dependency> 114 <groupId>commons-fileupload</groupId> 115 <artifactId>commons-fileupload</artifactId> 116 <version>1.3.1</version> 117 </dependency> 118 <!-- https://mvnrepository.com/artifact/commons-io/commons-io --> 119 <dependency> 120 <groupId>commons-io</groupId> 121 <artifactId>commons-io</artifactId> 122 <version>2.4</version> 123 </dependency> 124 <!--json--> 125 <!-- https://mvnrepository.com/artifact/org.json/json --> 126 <dependency> 127 <groupId>org.json</groupId> 128 <artifactId>json</artifactId> 129 <version>20160212</version> 130 </dependency> 131 <!-- https://mvnrepository.com/artifact/net.sf.json-lib/json-lib --> 132 <dependency> 133 <groupId>net.sf.json-lib</groupId> 134 <artifactId>json-lib</artifactId> 135 <version>2.4</version> 136 </dependency> 137 <!-- https://mvnrepository.com/artifact/commons-lang/commons-lang --> 138 <dependency> 139 <groupId>commons-lang</groupId> 140 <artifactId>commons-lang</artifactId> 141 <version>2.6</version> 142 </dependency> 143 <!-- https://mvnrepository.com/artifact/commons-beanutils/commons-beanutils --> 144 <dependency> 145 <groupId>commons-beanutils</groupId> 146 <artifactId>commons-beanutils</artifactId> 147 <version>1.8.3</version> 148 </dependency> 149 <!-- https://mvnrepository.com/artifact/commons-collections/commons-collections --> 150 <dependency> 151 <groupId>commons-collections</groupId> 152 <artifactId>commons-collections</artifactId> 153 <version>3.2.1</version> 154 </dependency> 155 <!-- https://mvnrepository.com/artifact/commons-logging/commons-logging --> 156 <dependency> 157 <groupId>commons-logging</groupId> 158 <artifactId>commons-logging</artifactId> 159 <version>1.2</version> 160 </dependency> 161 <!-- https://mvnrepository.com/artifact/net.sf.ezmorph/ezmorph --> 162 <dependency> 163 <groupId>net.sf.ezmorph</groupId> 164 <artifactId>ezmorph</artifactId> 165 <version>1.0.6</version> 166 </dependency> 167 <!--json serialize and deserialization--> 168 <!-- 引入fastjson依赖 --> 169 <dependency> 170 <groupId>com.alibaba</groupId> 171 <artifactId>fastjson</artifactId> 172 <version>1.2.12</version> 173 </dependency> 174 <!-- 引入gson依赖 --> 175 <dependency> 176 <groupId>com.google.code.gson</groupId> 177 <artifactId>gson</artifactId> 178 <version>2.6.2</version> 179 </dependency> 180 <!--Base64 加解密--> 181 <!-- https://mvnrepository.com/artifact/net.iharder/base64 --> 182 <dependency> 183 <groupId>net.iharder</groupId> 184 <artifactId>base64</artifactId> 185 <version>2.3.8</version> 186 </dependency> 187 <!-- https://mvnrepository.com/artifact/commons-codec/commons-codec --> 188 <dependency> 189 <groupId>commons-codec</groupId> 190 <artifactId>commons-codec</artifactId> 191 <version>1.10</version> 192 </dependency> 193 <!--log4j--> 194 <!-- https://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-core --> 195 <dependency> 196 <groupId>org.apache.logging.log4j</groupId> 197 <artifactId>log4j-core</artifactId> 198 <version>2.6.2</version> 199 </dependency> 200 <dependency> 201 <groupId>org.jetbrains</groupId> 202 <artifactId>annotations-java5</artifactId> 203 <version>RELEASE</version> 204 </dependency> 205 <!--mybatis--> 206 <dependency> 207 <groupId>org.mybatis</groupId> 208 <artifactId>mybatis</artifactId> 209 <version>3.3.0</version> 210 </dependency> 211 <dependency> 212 <groupId>org.mybatis</groupId> 213 <artifactId>mybatis-spring</artifactId> 214 <version>1.2.3</version> 215 </dependency> 216 </dependencies> 217 <build> 218 <finalName>Demo</finalName> 219 </build> 220 </project>
待配置好的jar包都自动下载并导入后,我们maven包的导入阶段就完成了,下面我们开始整合各个组件。
四、Spring MVC的配置
在resources资源文件夹下新建spring-servlet.xml文件,并在配置文件中声明spring mvc框架对控制器、页面、资源的访问
在其中添加下面配置标签信息:
1 <?xml version="1.0" encoding="UTF-8"?> 2 <beans xmlns="http://www.springframework.org/schema/beans" 3 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 4 xmlns:context="http://www.springframework.org/schema/context" 5 xmlns:mvc="http://www.springframework.org/schema/mvc" 6 xsi:schemaLocation="http://www.springframework.org/schema/beans 7 http://www.springframework.org/schema/beans/spring-beans-3.1.xsd 8 http://www.springframework.org/schema/context 9 http://www.springframework.org/schema/context/spring-context-3.1.xsd 10 http://www.springframework.org/schema/mvc 11 http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd"> 12 13 <!-- 启动注解驱动的Spring MVC功能,注册请求url和注解POJO类方法的映射--> 14 <mvc:annotation-driven > 15 16 </mvc:annotation-driven> 17 18 <!-- 启动包扫描功能,以便注册带有@Controllers、@service、@repository、@Component等注解的类成为spring的bean --> 19 <context:component-scan base-package="Controllers" /> 20 <!-- 对模型视图名称的解析,在请求时模型视图名称添加前后缀 --> 21 <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> 22 <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/> 23 <property name="prefix" value="/"/> <!-- 前缀 --> 24 <property name="suffix" value=".jsp"/> <!-- 后缀 --> 25 </bean> 26 <!-- 访问静态文件(jpg,js,css)的方法 --> 27 <!--<mvc:resources location="/files/" mapping="/files/**" />--> 28 <!--<mvc:resources location="/scripts/" mapping="/scripts/**" />--> 29 <!--<mvc:resources location="/styles/" mapping="/styles/**" />--> 30 <!--<mvc:resources location="/Views/" mapping="/Views/**" />--> 31 </beans>
这里的Controllers对应的是我们之前新建好的Controllers包文件夹。
对web.xml进行配置,将我们刚才添加的spring-servlet.xml配置进去
这里的classpath为resources资源目录
这一步配置的web.xml内容如下:
1 <!DOCTYPE web-app PUBLIC 2 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" 3 "http://java.sun.com/dtd/web-app_2_3.dtd" > 4 <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 5 xmlns="http://java.sun.com/xml/ns/javaee" 6 xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" 7 version="3.0"> 8 <display-name>Archetype Created Web Application</display-name> 9 <welcome-file-list> 10 <welcome-file>/index.jsp</welcome-file> 11 </welcome-file-list> 12 <!-- Spring MVC配置 --> 13 <servlet> 14 <servlet-name>spring</servlet-name> 15 <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> 16 <!--Spring-servlet.xml config--> 17 <init-param> 18 <param-name>contextConfigLocation</param-name> 19 <param-value>classpath:spring-servlet.xml</param-value> 20 </init-param> 21 <!-- load-on-startup元素标记容器是否在启动的时候就加载这个servlet(实例化并调用其init()方法) --> 22 <load-on-startup>1</load-on-startup> 23 </servlet> 24 <servlet-mapping> 25 <servlet-name>spring</servlet-name> 26 <url-pattern>/</url-pattern> 27 </servlet-mapping> 28 </web-app>
我们新建一个控制器测试一下(在Controllers包新建java类,RequestTestController):
接下来在RequestTestController里面写一个rest api接口:
接口代码如下:
1 package Controllers; 2 3 import org.springframework.web.bind.annotation.GetMapping; 4 import org.springframework.web.bind.annotation.RequestMapping; 5 import org.springframework.web.bind.annotation.RestController; 6 7 @RestController 8 @RequestMapping("/api/RequestTest") 9 public class RequestTestController { 10 11 @GetMapping() 12 public String TestString(){ 13 return "this is a test string. Time:2017-10-29 20:42:00"; 14 } 15 }
这样,我们便可以通过url地址来进行访问我们的接口数据
在右上角的运行服务器配置按钮,打开服务器配置项
这里如果左侧列表是空的话,我们就需要点击加号进行服务器的添加,选择Tomcat Server下的Local。然后点击刚刚添加的标签,在右侧输入Server Name,下面会自动提示设置编译方式,选一个编译方式,然后点击OK即可(这一步的前提是装好了Tomcat服务器,如果没有安装,则需要先安装Tomcat服务器)。
然后我们点击右上角的运行,如果没有什么问题的话,我们的控制台界面会提示服务启动成功!(我这样下来是不会出问题的)
等浏览器打开以后,我们输入我们配置的api地址:http://localhost:8080/api/RequestTest
这样,spring mvc已经成功整合到了项目里面!
五、Spring和Mybatis的配置
稍歇片刻后,我们继续进行Mybatis和Spring组件的整合...
先添加jdbc.properties(JDBC连接配置文件,当然这个文件里面的内容直接写到mybatis配置文件里面也是可以的)
内容如下:
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
继续在resources文件夹里面添加mybatis配置文件 spring-mybatis.xml
内容如下:
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
添加spring支持(applicationContext.xml),并在spring支持里面将mybatis配置文件进行引入
内容如下:
1 <?xml version="1.0" encoding="UTF-8"?> 2 <beans 3 xmlns="http://www.springframework.org/schema/beans" 4 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 5 xmlns:context="http://www.springframework.org/schema/context" 6 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.xsd"> 7 8 <context:annotation-config /> 9 <!-- 配置component所在的包,自动加载需要管理的Bean --> 10 <context:component-scan base-package="Service,Dao" /> 11 <import resource="spring-mybatis.xml" /> 12 </beans>
applicationContext.xml配置文件是对spring的配置,我们配置spring组件的扫描包围Service和Dao层目录,然后将spring-mybatis.xml配置文件导入.
完成这三个后的文件目录是这样子的:
target文件夹是刚才编译运行时候自动产生的,不要惊慌~~~
完成这几步后,我们还需要将spring的配置加载到已有的框架中去,打开web.xml文件,进行添加spring配置
在刚才的web-app标签内继续添加spring支持:
此刻完整的web.xml文件内容如下:
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
到此刻,我们的spring、mybatis已经整合完毕,接下来稍歇片刻,我们进行demo的完成。
六、demo的构建
打开数据库,我们新建一个数据库,并设计两张测试表,student和studentclass
student表的设计如下:
-- ---------------------------- -- Table structure for `student` -- ---------------------------- DROP TABLE IF EXISTS `student`; CREATE TABLE `student` ( `Uid` binary(36) NOT NULL COMMENT 'Uid', `Name` varchar(20) NOT NULL, `Age` int(3) NOT NULL, `ClassId` int(3) NOT NULL, PRIMARY KEY (`Uid`), KEY `StudentClass` (`ClassId`), CONSTRAINT `StudentClass` FOREIGN KEY (`ClassId`) REFERENCES `studentclass` (`ClassId`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
studentclass表的设计如下:
-- ---------------------------- -- Table structure for `studentclass` -- ---------------------------- DROP TABLE IF EXISTS `studentclass`; CREATE TABLE `studentclass` ( `ClassId` int(3) NOT NULL AUTO_INCREMENT, `ClassName` varchar(10) DEFAULT NULL, PRIMARY KEY (`ClassId`) ) ENGINE=InnoDB AUTO_INCREMENT=6 DEFAULT CHARSET=utf8;
将数据库建好后,我们进行Entity,Dao,Service层以及mapper文件的的编写。
首先在mapper文件夹新建一个mapper文件:StudentMapper.xml
1 <?xml version="1.0" encoding="UTF-8"?> 2 <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> 3 <mapper namespace="Dao.StudentMapper"> 4 <resultMap id="BaseResultMap" type="Entity.Student"> 5 <id column="Uid" jdbcType="BINARY" property="uid" /> 6 <result column="Name" jdbcType="VARCHAR" property="name" /> 7 <result column="Age" jdbcType="INTEGER" property="age" /> 8 <result column="ClassId" jdbcType="INTEGER" property="classid" /> 9 </resultMap> 10 <sql id="Base_Column_List"> 11 Uid, Name, Age, ClassId 12 </sql> 13 <select id="selectByPrimaryKey" parameterType="byte[]" resultMap="BaseResultMap"> 14 select 15 <include refid="Base_Column_List" /> 16 from student 17 where Uid = #{uid,jdbcType=BINARY} 18 </select> 19 <select id="selectByCondition" parameterType="Entity.Student" resultMap="BaseResultMap"> 20 SELECT 21 <include refid="Base_Column_List"/> 22 from student 23 <where> 24 1=1 25 <if test="uid != null"> 26 and Uid=#{uid,jdbcType=BINARY} 27 </if> 28 <if test="name != null"> 29 and Name=#{name,jdbcType=VARCHAR} 30 </if> 31 <if test="age != null"> 32 and Age=#{age,jdbcType=INTEGER} 33 </if> 34 <if test="classid != null"> 35 and ClassId=#{classid,jdbcType=INTEGER} 36 </if> 37 </where> 38 </select> 39 <delete id="deleteByPrimaryKey" parameterType="byte[]"> 40 delete from student 41 where Uid = #{uid,jdbcType=BINARY} 42 </delete> 43 <insert id="insert" parameterType="Entity.Student"> 44 insert into student (Uid, Name, Age, 45 ClassId) 46 values (#{uid,jdbcType=BINARY}, #{name,jdbcType=VARCHAR}, #{age,jdbcType=INTEGER}, 47 #{classid,jdbcType=INTEGER}) 48 </insert> 49 <insert id="insertSelective" parameterType="Entity.Student"> 50 insert into student 51 <trim prefix="(" suffix=")" suffixOverrides=","> 52 <if test="uid != null"> 53 Uid, 54 </if> 55 <if test="name != null"> 56 Name, 57 </if> 58 <if test="age != null"> 59 Age, 60 </if> 61 <if test="classid != null"> 62 ClassId, 63 </if> 64 </trim> 65 <trim prefix="values (" suffix=")" suffixOverrides=","> 66 <if test="uid != null"> 67 #{uid,jdbcType=BINARY}, 68 </if> 69 <if test="name != null"> 70 #{name,jdbcType=VARCHAR}, 71 </if> 72 <if test="age != null"> 73 #{age,jdbcType=INTEGER}, 74 </if> 75 <if test="classid != null"> 76 #{classid,jdbcType=INTEGER}, 77 </if> 78 </trim> 79 </insert> 80 <update id="updateByPrimaryKeySelective" parameterType="Entity.Student"> 81 update student 82 <set> 83 <if test="name != null"> 84 Name = #{name,jdbcType=VARCHAR}, 85 </if> 86 <if test="age != null"> 87 Age = #{age,jdbcType=INTEGER}, 88 </if> 89 <if test="classid != null"> 90 ClassId = #{classid,jdbcType=INTEGER}, 91 </if> 92 </set> 93 where Uid = #{uid,jdbcType=BINARY} 94 </update> 95 <update id="updateByPrimaryKey" parameterType="Entity.Student"> 96 update student 97 set Name = #{name,jdbcType=VARCHAR}, 98 Age = #{age,jdbcType=INTEGER}, 99 ClassId = #{classid,jdbcType=INTEGER} 100 where Uid = #{uid,jdbcType=BINARY} 101 </update> 102 </mapper>
以上这段代码是直接使用mybatis generator直接进行生成的,如果不想手写的话(手写容易出错),可以直接使用该工具进行生成,该工具的下载以及使用参见本人博客地址:http://www.cnblogs.com/qixiaoyizhan/p/7597315.html
添加Entity实体
1 package Entity; 2 3 public class Student { 4 private byte[] uid; 5 6 private String name; 7 8 private Integer age; 9 10 private Integer classid; 11 12 public byte[] getUid() { 13 return uid; 14 } 15 16 public void setUid(byte[] uid) { 17 this.uid = uid; 18 } 19 20 public String getName() { 21 return name; 22 } 23 24 public void setName(String name) { 25 this.name = name == null ? null : name.trim(); 26 } 27 28 public Integer getAge() { 29 return age; 30 } 31 32 public void setAge(Integer age) { 33 this.age = age; 34 } 35 36 public Integer getClassid() { 37 return classid; 38 } 39 40 public void setClassid(Integer classid) { 41 this.classid = classid; 42 } 43 }
在Dao层写Mybatis接口(不需要写实现类,mybatis不需要),新建StudentMapper
1 package Dao; 2 3 import Entity.Student; 4 import org.springframework.stereotype.Repository; 5 6 import java.util.List; 7 8 @Repository 9 public interface StudentMapper { 10 int deleteByPrimaryKey(byte[] uid); 11 12 int insert(Student record); 13 14 int insertSelective(Student record); 15 16 Student selectByPrimaryKey(byte[] uid); 17 18 List<Student> selectByCondition(Student record); 19 20 int updateByPrimaryKeySelective(Student record); 21 22 int updateByPrimaryKey(Student record); 23 }
在Service层写对Dao层的访问逻辑,当然Demo没有什么业务处理逻辑,仅作为Demo
IStudentService 接口:
1 package Service; 2 3 import Entity.Student; 4 5 import java.util.List; 6 7 public interface IStudentService { 8 int deleteByPrimaryKey(byte[] uid); 9 10 int insert(Student record); 11 12 int insertSelective(Student record); 13 14 Student selectByPrimaryKey(byte[] uid); 15 16 List<Student> selectByCondition(Student record); 17 18 int updateByPrimaryKeySelective(Student record); 19 20 int updateByPrimaryKey(Student record); 21 }
StudentService 实现了 IStudentService 接口:
1 package Service; 2 3 import Dao.StudentMapper; 4 import Entity.Student; 5 import org.springframework.beans.factory.annotation.Autowired; 6 import org.springframework.stereotype.Service; 7 8 import java.util.List; 9 10 @Service 11 public class StudentService implements IStudentService { 12 @Autowired 13 private StudentMapper studentMapper; 14 15 @Override 16 public int deleteByPrimaryKey(byte[] uid) { 17 return studentMapper.deleteByPrimaryKey(uid); 18 } 19 20 @Override 21 public int insert(Student record) { 22 return studentMapper.insert(record); 23 } 24 25 @Override 26 public int insertSelective(Student record) { 27 return studentMapper.insertSelective(record); 28 } 29 30 @Override 31 public Student selectByPrimaryKey(byte[] uid) { 32 return studentMapper.selectByPrimaryKey(uid); 33 } 34 35 @Override 36 public List<Student> selectByCondition(Student record) { 37 return studentMapper.selectByCondition(record); 38 } 39 40 @Override 41 public int updateByPrimaryKeySelective(Student record) { 42 return studentMapper.updateByPrimaryKeySelective(record); 43 } 44 45 @Override 46 public int updateByPrimaryKey(Student record) { 47 return studentMapper.updateByPrimaryKey(record); 48 } 49 }
然后我们写一个StudentController用于调用Service
1 package Controllers; 2 3 import Entity.Student; 4 import Service.IStudentService; 5 import org.springframework.beans.factory.annotation.Autowired; 6 import org.springframework.web.bind.annotation.GetMapping; 7 import org.springframework.web.bind.annotation.RequestMapping; 8 import org.springframework.web.bind.annotation.RestController; 9 10 import java.util.List; 11 12 @RestController 13 @RequestMapping("/api/Student") 14 public class StudentController { 15 @Autowired 16 private IStudentService service; 17 18 @GetMapping() 19 public String Get() { 20 List<Student> students = service.selectByCondition(new Student()); 21 String jsonResult = com.alibaba.fastjson.JSON.toJSONString(students); 22 return jsonResult; 23 } 24 }
走到这一步的代码目录结构是这样子的:
如果进行顺利的话,我们运行我们的Tomacat服务器,并调用我们的新接口:http://localhost:8080/api/Student
运行时候,别忘记了修改jdbc.properties文件里的连接url以及用户名密码!!!
哇,数据成功显示!(别把这个数据当成你会真的显示出来的一样,这是我数据库原有的数据,哈哈哈)
还不快去添加几条数据调用一下试试嘛~
七、结尾
至此,我们的SSM框架已经基本搭建完毕,我们已经用我们搭建的Demo从真实的数据库中获取到了数据,并转成了Json格式,在浏览器中用Rest api接口的形式获取到了。
该项目源代码可以在Github上找到,如果需要的可以直接去下载->
https://github.com/dong666/SSM-Demo (不赶紧访问点个Star嘛?