Spring-boot + Mybatis整合

项目结构图如下：

Paste_Image.png

下面分步骤一一讲解：
第一步，在pom.xml中添加相应依赖：
<pre>
<?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.example</groupId>
<artifactId>spring-boot-sample-helloworld</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

<name>spring-boot-sample-helloworld</name>
<description>Demo project for Spring Boot</description>

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.5.3.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
</parent>

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <java.version>1.8</java.version>
</properties>

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
    
    <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.0.0</version>
    </dependency>
    
    <dependency>  
        <groupId>mysql</groupId>  
        <artifactId>mysql-connector-java</artifactId>  
    </dependency> 
</dependencies>

<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
        </plugin>
    </plugins>
</build>

</project>

</pre>

第二步，新建application.properties
<pre>
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/jeesite
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.max-idle=10
spring.datasource.max-wait=10000
spring.datasource.min-idle=5
spring.datasource.initial-size=5

server.port=8080
server.session.timeout=10
server.tomcat.uri-encoding=UTF-8

mybatis-config路径

mybatis.config=classpath:mybatis-config.xml

mapper文件路径

mybatis.mapperLocations=classpath:mappers/*.xml

domain object's package

mybatis.typeAliasesPackage=com.example.springbootsamplehelloworld.bean
</pre>

<pre>
package com.example.demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class Application {

public static void main(String[] args) {
    SpringApplication.run(Application.class, args);
}

}

</pre>

第三步，创建bean,mapper,service,controller
<pre>
package com.example.springbootsamplehelloworld.bean;

import java.util.Date;

public class AppMessage {
private String id;

private String message;

private Date senddate;

public AppMessage(){
    
}

public String getId() {
    return id;
}

public void setId(String id) {
    this.id = id == null ? null : id.trim();
}

public String getMessage() {
    return message;
}

public void setMessage(String message) {
    this.message = message == null ? null : message.trim();
}

public Date getSenddate() {
    return senddate;
}

public void setSenddate(Date senddate) {
    this.senddate = senddate;
}

}

</pre>

<pre>
package com.example.springbootsamplehelloworld.mapper;

import java.util.List;

import com.example.springbootsamplehelloworld.bean.AppMessage;

public interface AppMessageMapper {

int deleteByPrimaryKey(String id);

int insert(AppMessage record);

int insertSelective(AppMessage record);

AppMessage selectByPrimaryKey(String id);

int updateByPrimaryKeySelective(AppMessage record);

int updateByPrimaryKey(AppMessage record);

List<AppMessage> selectAll();

List<AppMessage> getMessById(String id);

public void init();

}

</pre>

<pre>
package com.example.springbootsamplehelloworld.service;

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

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

import com.example.springbootsamplehelloworld.bean.AppMessage;
import com.example.springbootsamplehelloworld.mapper.AppMessageMapper;

@Service
public class AppMessageService {

@Autowired
private AppMessageMapper mapper;

public List<AppMessage> getMessage(){
     List<AppMessage> list = new ArrayList<AppMessage>();
     list.add(mapper.selectByPrimaryKey("1"));
     //list = mapper.selectAll();
     return list;
}

public List<AppMessage> getAllMessage(){
     List<AppMessage> list = new ArrayList<AppMessage>();
     list = mapper.selectAll();
     return list;
}

public int addMessage(AppMessage appMessage) {
    return mapper.insert(appMessage);
}

public List<AppMessage> getMessageById(String id) {
    return mapper.getMessById(id);
}

public int delMessage(String id) {
    return mapper.deleteByPrimaryKey(id);
}

}

<pre>

<pre>
package com.example.springbootsamplehelloworld.controller;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import com.example.springbootsamplehelloworld.bean.AppMessage;
import com.example.springbootsamplehelloworld.service.AppMessageService;

@RestController
@RequestMapping("/appmessage")
public class APPMessageController {

@Autowired
private AppMessageService service;

@RequestMapping("/getThree")
public List<AppMessage> getThreeForMessage(){
    
    List<AppMessage> list = service.getMessage();        
    return list;
}

@RequestMapping("/getAll")
public List<AppMessage> getAllMessage(){
    
    List<AppMessage> list = service.getAllMessage();
    int num = list.size();
    if(null!=list && num>3){
        for (int i = 0; i < num-3; i++) {
            list.remove(0);
        }
    }
    return list;
}

@RequestMapping("/getByID")
public List<AppMessage> getMessageById(@RequestParam("id") String id){
    List<AppMessage> list = service.getMessageById(id);
    int num = list.size();
    if(null!=list && num>5){
        for (int i = 0; i < num-5; i++) {
            list.remove(0);
        }
    }
    return list;
}

@RequestMapping(value = "/add",method = RequestMethod.POST)
public int addMessage(@RequestBody AppMessage appMessage){
    return service.addMessage(appMessage);
}

@RequestMapping(value="/delMessageById")
public int delMessageById(@RequestParam("id") String id){
        return service.delMessage(id);
}

}

</pre>

需要注意的地方：
1，bean中需要有无参构造器(如果存在有参构造器，则编译器不会自动添加无参构造器)

Paste_Image.png

第四步，访问

Paste_Image.png
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