一、新建Maven工程,不全Maven所需文件夹,在pom.xml引入SpringBoot的依赖包,如下
<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.lgp</groupId>
<artifactId>SpringBoot</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>SpringBoot</name>
<url>http://maven.apache.org</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<!– Inherit defaults from Spring Boot –>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.4.0.BUILD-SNAPSHOT</version>
</parent>
<!– Add typical dependencies for a web application –>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
</dependencies>
<!– Package as an executable jar –>
<build>
<plugins>
<!– <plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin> –>
<!– Maven Assembly Plugin –>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-assembly-plugin</artifactId>
<version>2.4.1</version>
<configuration>
<!– get all project dependencies –>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
<!– MainClass in mainfest make a executable jar –>
<archive>
<manifest>
<mainClass>com.lgp.SpringBoot.App</mainClass>
</manifest>
</archive>
</configuration>
<executions>
<execution>
<id>make-assembly</id>
<!– bind to the packaging phase –>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
<!– Add Spring repositories –>
<!– (you don’t need this if you are using a .RELEASE version) –>
<repositories>
<repository>
<id>spring-snapshots</id>
<url>http://repo.spring.io/snapshot</url>
<snapshots><enabled>true</enabled></snapshots>
</repository>
<repository>
<id>spring-milestones</id>
<url>http://repo.spring.io/milestone</url>
</repository>
</repositories>
<pluginRepositories>
<pluginRepository>
<id>spring-snapshots</id>
<url>http://repo.spring.io/snapshot</url>
</pluginRepository>
<pluginRepository>
<id>spring-milestones</id>
<url>http://repo.spring.io/milestone</url>
</pluginRepository>
</pluginRepositories>
</project>
二、有两种方法与数据库建立连接,一种是集成Mybatis,另一种用JdbcTemplate
(1)、用JdbcTemplate
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
添加配置文件配置数据库和其他参数
在resource文件夹下添加application.properties配置文件并输入数据库参数,如下:
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/test
spring.datasource.username=root
spring.datasource.password=123456
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=8011
server.session.timeout=10
server.tomcat.uri-encoding=UTF-8
新建Controller类测试数据库连接
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
@RequestMapping(“/mydb”)
public class DbController {
@Autowired
private JdbcTemplate jdbcTemplate;
@RequestMapping(“/getUsers”)
public List<Map<String, Object>> getDbType(){
String sql = “select * from appuser”;
List<Map<String, Object>> list = jdbcTemplate.queryForList(sql);
for (Map<String, Object> map : list) {
Set<Entry<String, Object>> entries = map.entrySet( );
if(entries != null) {
Iterator<Entry<String, Object>> iterator = entries.iterator( );
while(iterator.hasNext( )) {
Entry<String, Object> entry =(Entry<String, Object>) iterator.next( );
Object key = entry.getKey( );
Object value = entry.getValue();
System.out.println(key+”:”+value);
}
}
}
return list;
}
@RequestMapping(“/user/{id}”)
public Map<String,Object> getUser(@PathVariable String id){
Map<String,Object> map = null;
List<Map<String, Object>> list = getDbType();
for (Map<String, Object> dbmap : list) {
Set<String> set = dbmap.keySet();
for (String key : set) {
if(key.equals(“id”)){
if(dbmap.get(key).equals(id)){
map = dbmap;
}
}
}
}
if(map==null)
map = list.get(0);
return map;
}
}
运行App 输入地址 输出数据库数据
2)、集成Mybatis
添加mybatis依赖
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.0.0</version>
</dependency>
版本号可能有更新!
在配置文件中添加配置信息:
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/test
spring.datasource.username=root
spring.datasource.password=123456
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=8011
server.session.timeout=10
server.tomcat.uri-encoding=UTF-8
# mybatis.config= classpath:mybatis-config.xml
mybatis.mapperLocations=classpath:mappers/*.xml
# domain object’s package
mybatis.typeAliasesPackage=com.lgp.SpringBoot.bean
# handler’s package
# mybatis.typeHandlersPackage=
# check the mybatis configuration exists
# mybatis.check-config-location=
# mode of execution. Default is SIMPLE
# mybatis.executorType=
依次添加mapper的接口类和xml文件
主要代码:
import java.util.List;
import com.lgp.SpringBoot.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);
}
<?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.lgp.SpringBoot.mapper.AppMessageMapper” >
<resultMap id=”BaseResultMap” type=”com.lgp.SpringBoot.bean.AppMessage” >
<id column=”id” property=”id” jdbcType=”VARCHAR” />
<result column=”message” property=”message” jdbcType=”VARCHAR” />
<result column=”senddate” property=”senddate” jdbcType=”TIMESTAMP” />
</resultMap>
<sql id=”Base_Column_List” >
id, message, senddate
</sql>
<select id=”selectByPrimaryKey” resultMap=”BaseResultMap” parameterType=”java.lang.String” >
select
<include refid=”Base_Column_List” />
from appuser_message
where id = #{id,jdbcType=VARCHAR}
</select>
<delete id=”deleteByPrimaryKey” parameterType=”java.lang.String” >
delete from appuser_message
where id = #{id,jdbcType=VARCHAR}
</delete>
<insert id=”insert” parameterType=”com.lgp.SpringBoot.bean.AppMessage” >
insert into appuser_message (id, message, senddate
)
values (#{id,jdbcType=VARCHAR}, #{message,jdbcType=VARCHAR}, #{senddate,jdbcType=TIMESTAMP}
)
</insert>
<insert id=”insertSelective” parameterType=”com.lgp.SpringBoot.bean.AppMessage” >
insert into appuser_message
<trim prefix=”(” suffix=”)” suffixOverrides=”,” >
<if test=”id != null” >
id,
</if>
<if test=”message != null” >
message,
</if>
<if test=”senddate != null” >
senddate,
</if>
</trim>
<trim prefix=”values (” suffix=”)” suffixOverrides=”,” >
<if test=”id != null” >
#{id,jdbcType=VARCHAR},
</if>
<if test=”message != null” >
#{message,jdbcType=VARCHAR},
</if>
<if test=”senddate != null” >
#{senddate,jdbcType=TIMESTAMP},
</if>
</trim>
</insert>
<update id=”updateByPrimaryKeySelective” parameterType=”com.lgp.SpringBoot.bean.AppMessage” >
update appuser_message
<set >
<if test=”message != null” >
message = #{message,jdbcType=VARCHAR},
</if>
<if test=”senddate != null” >
senddate = #{senddate,jdbcType=TIMESTAMP},
</if>
</set>
where id = #{id,jdbcType=VARCHAR}
</update>
<update id=”updateByPrimaryKey” parameterType=”com.lgp.SpringBoot.bean.AppMessage” >
update appuser_message
set message = #{message,jdbcType=VARCHAR},
senddate = #{senddate,jdbcType=TIMESTAMP}
where id = #{id,jdbcType=VARCHAR}
</update>
<select id=”selectAll” resultMap=”BaseResultMap”>
select
id, message, senddate
from appuser_message
order by senddate asc
</select>
<select id=”getMessById” resultMap=”BaseResultMap” parameterType=”java.lang.String”>
select
id, message, senddate
from
appuser_message
where id = #{id,jdbcType=VARCHAR}
order by senddate asc
</select>
</mapper>
import java.util.Date;
public class AppMessage {
private String id;
private String message;
private Date senddate;
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;
}
}
import java.util.ArrayList;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.lgp.SpringBoot.bean.AppMessage;
import com.lgp.SpringBoot.mapper.AppMessageMapper;
@Service
public class AppMessageService {
@Autowired
private AppMessageMapper mapper;
public List<AppMessage> getMessage(){
List<AppMessage> list = new ArrayList<AppMessage>();
list.add(mapper.selectByPrimaryKey(“xtt”));
//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);
}
}
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.lgp.SpringBoot.bean.AppMessage;
import com.lgp.SpringBoot.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”,method=RequestMethod.POST)
public int delMessageById(@RequestParam(“id”) String id){
return service.delMessage(id);
}
}
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原创文章,作者:奋斗,如若转载,请注明出处:https://blog.ytso.com/14804.html