SpringBoot Starter设计

骑猪看日落 2024-04-17 05:36 45阅读 0赞

SpringBoot重要组件是各种Starter，需要定制扩展SpringBoot功能，必须自定义Starter。本例自定义Starter只使用与SpringBoot 2.x以后版本，实现Redis缓存管理，文件上传基本服务，使用JDBC操作数据库。

## 定义Maven工程，定义POM依赖 ##

<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.gufang</groupId>
      <artifactId>mystarter-spring-boot-starter</artifactId>
      <version>0.0.1-SNAPSHOT</version>
      <packaging>jar</packaging>
    
      <name>mystarter-spring-boot-starter</name>
      <url>http://maven.apache.org</url>
    
    
    	<properties>
    		
    		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    		<java.version>1.8</java.version>
    
    		
    		<spring-boot.version>1.5.10.RELEASE</spring-boot.version>
    
    		
    		<maven-compiler-plugin.version>3.7.0</maven-compiler-plugin.version>
    		<maven-surefire-plugin.version>2.20.1</maven-surefire-plugin.version>
    		<maven-source-plugin.version>3.0.1</maven-source-plugin.version>
    		<maven-javadoc-plugin.version>3.0.0</maven-javadoc-plugin.version>
    		<maven-gpg-plugin.version>1.6</maven-gpg-plugin.version>
    	</properties>
    
    	<dependencies>
    		<dependency>
    			<groupId>org.springframework.boot</groupId>
    			<artifactId>spring-boot-starter</artifactId>
    			<optional>true</optional>
    		</dependency>
    		<dependency>
    			<groupId>org.springframework.boot</groupId>
    			<artifactId>spring-boot-configuration-processor</artifactId>
    			<optional>true</optional>
    		</dependency>
    		<dependency>
    			<groupId>junit</groupId>
    			<artifactId>junit</artifactId>
    			<scope>test</scope>
    		</dependency>
    		<dependency>
    		    <groupId>redis.clients</groupId>
    		    <artifactId>jedis</artifactId>
    		    <version>2.9.0</version>
    		</dependency>
    		<dependency>
    		    <groupId>com.alibaba</groupId>
    		    <artifactId>fastjson</artifactId>
    		    <version>1.2.54</version>
    		</dependency>
    		<dependency>
    		    <groupId>com.fasterxml.jackson.core</groupId>
    		    <artifactId>jackson-databind</artifactId>
    		    <version>2.9.8</version>
    		</dependency>
    		<dependency>
    		    <groupId>com.fasterxml.jackson.core</groupId>
    		    <artifactId>jackson-annotations</artifactId>
    		    <version>2.9.0</version>
    		</dependency>
    		<dependency>
    		    <groupId>org.springframework.data</groupId>
    		    <artifactId>spring-data-redis</artifactId>
    		    <version>2.1.6.RELEASE</version>
    		</dependency>
    		<dependency>
    		    <groupId>org.springframework</groupId>
    		    <artifactId>spring-web</artifactId>
    		    <version>5.1.6.RELEASE</version>
    		</dependency>
    		<dependency>
    		    <groupId>javax.servlet</groupId>
    		    <artifactId>javax.servlet-api</artifactId>
    		    <version>4.0.0</version>
    		    <scope>provided</scope>
    		</dependency>
    	</dependencies>
    
    	<dependencyManagement>
    		<dependencies>
    			<dependency>
    				<groupId>org.springframework.boot</groupId>
    				<artifactId>spring-boot-dependencies</artifactId>
    				<version>${spring-boot.version}</version>
    				<type>pom</type>
    				<scope>import</scope>
    			</dependency>
    		</dependencies>
    	</dependencyManagement>
    
    	<build>
    		<plugins>
    			<plugin>
    				<groupId>org.apache.maven.plugins</groupId>
    				<artifactId>maven-compiler-plugin</artifactId>
    				<version>${maven-compiler-plugin.version}</version>
    				<configuration>
    					<encoding>${project.build.sourceEncoding}</encoding>
    					<source>${java.version}</source>
    					<target>${java.version}</target>
    				</configuration>
    			</plugin>
    		</plugins>
    	</build>
    </project>

## 定义配置文件操作类 ##

本例重用了SpringBoot-data-jdbc-starter配置信息

package com.gufang;
    
    import org.springframework.boot.context.properties.ConfigurationProperties;
    import org.springframework.stereotype.Component;
    
    
    @ConfigurationProperties(prefix="spring.datasource")
    public class MyStarterProperties {
    	private String driverClassName = null;
    	private String url = null;
    	private String username = null;
    	private String password = null;
    	
    	private String redishost=null;
    	private String redisport=null;
    
    	public String getDriverClassName() {
    		return driverClassName;
    	}
    	public void setDriverClassName(String driverClassName) {
    		this.driverClassName = driverClassName;
    	}
    	public String getUrl() {
    		return url;
    	}
    	public void setUrl(String url) {
    		this.url = url;
    	}
    	public String getUsername() {
    		return username;
    	}
    	public void setUsername(String username) {
    		this.username = username;
    	}
    	public String getPassword() {
    		return password;
    	}
    	public void setPassword(String password) {
    		this.password = password;
    	}
    	public String getRedishost() {
    		return redishost;
    	}
    	public void setRedishost(String redishost) {
    		this.redishost = redishost;
    	}
    	public String getRedisport() {
    		return redisport;
    	}
    	public void setRedisport(String redisport) {
    		this.redisport = redisport;
    	}
    
    }

## 使能注解 ##

package com.gufang;
    
    import java.lang.annotation.Documented;
    import java.lang.annotation.ElementType;
    import java.lang.annotation.Retention;
    import java.lang.annotation.RetentionPolicy;
    import java.lang.annotation.Target;
    
    @Target(ElementType.TYPE)
    @Retention(RetentionPolicy.RUNTIME)
    @Documented
    public @interface EnableMyStarterConfiguration {
    
    }

## 自配置类 ##

package com.gufang;
    
    import java.time.Duration;
    
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
    import org.springframework.boot.context.properties.EnableConfigurationProperties;
    import org.springframework.boot.web.servlet.ServletComponentScan;
    import org.springframework.cache.CacheManager;
    import org.springframework.cache.annotation.EnableCaching;
    import org.springframework.cache.interceptor.KeyGenerator;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.context.annotation.Primary;
    import org.springframework.context.annotation.PropertySource;
    import org.springframework.data.redis.cache.RedisCacheConfiguration;
    import org.springframework.data.redis.cache.RedisCacheManager;
    import org.springframework.data.redis.connection.RedisConnectionFactory;
    import org.springframework.data.redis.core.RedisTemplate;
    import org.springframework.data.redis.cache.RedisCacheConfiguration;
    import org.springframework.data.redis.cache.RedisCacheManager;
    import org.springframework.data.redis.cache.RedisCacheWriter;
    import org.springframework.data.redis.connection.RedisConnectionFactory;
    import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;
    import org.springframework.data.redis.serializer.StringRedisSerializer;
    
    import com.fasterxml.jackson.annotation.JsonAutoDetect;
    import com.fasterxml.jackson.annotation.PropertyAccessor;
    import com.fasterxml.jackson.databind.ObjectMapper;
    
    
    @Configuration //向Spring容器配置对象
    @ConditionalOnBean(annotation=EnableMyStarterConfiguration.class)
    //当Spring容器中包含EnableMyStarterConfiguration声明对象时，进行配置MyStarterAutoConfiguration
    @EnableConfigurationProperties(MyStarterProperties.class)
    @ServletComponentScan
    @EnableCaching
    public class MyStarterAutoConfiguration {
    	@Autowired
    	private MyStarterProperties prop;
    	
    	@Bean
    	public MyConnection createConnecton()
    	{
    		String className=prop.getDriverClassName();
    		String user=prop.getUsername();
    		String pwd=prop.getPassword();
    		String url=prop.getUrl();
    		String redishost=prop.getRedishost();
    		String redisport=prop.getRedisport();
    		return new MyConnection(className,url,user,pwd,redishost,redisport);
    	}
    	
    	/**
    	* 生成Redis的键值，根据类名＋方法名＋参数值的形式
    	* @return
    	*/
        @Bean(name = "keyGenerator")
        public KeyGenerator keyGenerator() {
            return new KeyGenerator(){
                @Override
                public Object generate(Object target, java.lang.reflect.Method method, 
                        Object... params) {
                    StringBuffer sb = new StringBuffer();
                    sb.append(target.getClass().getName());
                    sb.append(method.getName());
                    for(Object obj:params){
                        if(obj != null)
                        {
                        	sb.append("_");
                            sb.append(obj.toString());
                        }
                    }
                    return sb.toString();
                }
            };
        }
        
    
        @SuppressWarnings("rawtypes")
        @Bean
        public CacheManager cacheManager(RedisConnectionFactory redisConnectionFactory) {
        	// 设置缓存有效期
        	RedisCacheConfiguration redisCacheConfiguration = RedisCacheConfiguration.defaultCacheConfig()
        				.entryTtl(Duration.ofSeconds(100000000000L));
        	return RedisCacheManager
        	.builder(RedisCacheWriter.nonLockingRedisCacheWriter(redisConnectionFactory))
        	.cacheDefaults(redisCacheConfiguration).build();
    
        }
    
        @Bean
        @SuppressWarnings({"rawtypes", "unchecked"})
        public RedisTemplate<Object,Object> redisTemplate(RedisConnectionFactory connectionFactory){
            RedisTemplate<Object,Object> redisTemplate=new RedisTemplate<Object,Object>();
            redisTemplate.setConnectionFactory(connectionFactory);
            //使用Jackson2JsonRedisSerializer替换默认的序列化规则
            Jackson2JsonRedisSerializer jackson2JsonRedisSerializer=new Jackson2JsonRedisSerializer(Object.class);
            ObjectMapper objectMapper=new ObjectMapper();
            objectMapper.setVisibility(PropertyAccessor.ALL,JsonAutoDetect.Visibility.ANY);
            objectMapper.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
            jackson2JsonRedisSerializer.setObjectMapper(objectMapper);
    
    
            //设置value的序列化规则
            redisTemplate.setValueSerializer(jackson2JsonRedisSerializer);
            //设置key的序列化规则
            redisTemplate.setKeySerializer(new StringRedisSerializer());
            redisTemplate.afterPropertiesSet();
            return redisTemplate;
        }
    
        
      
    //	/**
    //	 * 生成CacheManager对象
    //	* @param redisTemplate
    //	* @return
    //	*/
    //	  @Bean 
    //	  public CacheManager cacheManager(@SuppressWarnings("rawtypes") RedisTemplate redisTemplate) {
    //	      RedisCacheManager cacheManager = new RedisCacheManager(redisTemplate);
    //	      cacheManager.setDefaultExpiration(10000);
    //	      return cacheManager;
    //	  }
    //	
    //		/**
    //	 * 生成Redis内存管理模板，注解@Primary代表此对象是同类型对象的主对象，优先被使用
    //	* @param factory
    //	* @return
    //	*/
    //	  @Primary
    //	  @Bean
    //	  public RedisTemplate<String, Object> redisTemplate(RedisConnectionFactory factory){
    //	      RedisTemplate<String, Object> template = new RedisTemplate<String, Object>();
    //	      template.setKeySerializer(new StringRedisSerializer());
    //	      template.setConnectionFactory(factory);
    //	      setSerializer(template);
    //	      template.afterPropertiesSet();
    //	      return template;
    //	  }
    
    	/**
    	 * 序列化Redis的键和值对象
    	* @param template
    	*/
        private void setSerializer(RedisTemplate template){
            @SuppressWarnings({ "rawtypes", "unchecked" })
            Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = 
                new Jackson2JsonRedisSerializer(Object.class);
            ObjectMapper om = new ObjectMapper();
            om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
            om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
            jackson2JsonRedisSerializer.setObjectMapper(om);
            template.setValueSerializer(jackson2JsonRedisSerializer);
         }
        
        @Bean
        public MyRedisTool createRedisTool()
        {
        	return new MyRedisTool();
        }
        
        @Bean
        public MyFileTool createFileTool()
        {
        	return new MyFileTool();
        }
    }

## 数据库操作类 ##

package com.gufang;
    
    import java.sql.Statement;
    import java.io.ByteArrayInputStream;
    import java.io.ByteArrayOutputStream;
    import java.io.InputStream;
    import java.io.OutputStream;
    import java.sql.Blob;
    import java.sql.Connection;
    import java.sql.Date;
    import java.sql.DriverManager;
    import java.sql.PreparedStatement;
    import java.sql.ResultSet;
    import java.util.ArrayList;
    import java.util.HashMap;
    import java.util.List;
    import java.util.Map;
    
    import com.gufang.model.FileInfo;
    
    import redis.clients.jedis.Jedis;
    import redis.clients.jedis.JedisPool;
    
    public class MyConnection {
    	private String className,url,user,pwd,redishost,redisport = null;
    	
    	public MyConnection(String className,String url,String user,String pwd,
    			String redishost,String redisport)
    	{
    		this.className= className;
    		this.url= url;
    		this.user= user;
    		this.pwd= pwd;
    		this.redishost=redishost;
    		this.redisport=redisport;
    		
    		//检查数据库表T_FILE是否存在
    		createFileTable();
    	}
    	
    	public Connection getConnection()
    	{
    		try {
    			Class.forName(className);
    			return DriverManager.getConnection(url, user, pwd);
    		} catch (Exception e) {
    			e.printStackTrace();
    		}
    		return null;
    	}
    	
    	public List<Map> query(String sql)
    	{
    		try {
    			Connection conn=getConnection();
    			Statement statement=conn.createStatement();
    			ResultSet rs=statement.executeQuery(sql);
    			java.sql.ResultSetMetaData rsmData=rs.getMetaData();
    			List<Map> lst=new ArrayList<Map>();
    			while(rs.next())//结果集指针
    			{
    				int cols=rsmData.getColumnCount();
    				Map map=new HashMap();
    				for(int i=1;i<=cols;i++)
    				{
    					String colName=rsmData.getColumnName(i);
    					String val=rs.getString(colName);
    					map.put(colName, val);
    				}
    				lst.add(map);
    			}
    			rs.close();
    			statement.close();
    			conn.close();
    			return lst;
    		} catch (Exception e) {
    			e.printStackTrace();
    		}
    		return null;
    	}
    	
    	private void createFileTable()
    	{
    		try {
    			Connection conn=getConnection();
    			Statement statement=conn.createStatement();
    			String checkSql = "select id from T_FILE";
    			try {
    				statement.execute(checkSql);
    				System.out.println("######################################################");
    				System.out.println("###数据库表    T_FILE已经存在                                                                                          ###");
    				System.out.println("######################################################");
    			} catch (Exception e) {
    				String createSql = "create table T_FILE(id long,"+
    						"name varchar(200),contexttype varchar(100),length bigint,dt date,content mediumblob)";
    				statement.execute(createSql);
    				System.out.println("######################################################");
    				System.out.println("###数据库表    T_FILE被创建                                                                                              ###");
    				System.out.println("######################################################");
    			}
    			statement.close();
    			conn.close();
    		} catch (Exception e) {
    			e.printStackTrace();
    		}
    	}
    	
    	public void saveFileInfo(FileInfo fi)
    	{
    		try {
    			Connection conn=getConnection();
    			String sql = "insert into T_FILE(id,name,contexttype,length,dt,content)"+
    					"values(?,?,?,?,?,?)";
    			PreparedStatement pstat = conn.prepareStatement(sql);
    			long id = System.currentTimeMillis();
    			fi.setId(id);
    			pstat.setLong(1, fi.getId());
    			pstat.setString(2, fi.getName());
    			pstat.setString(3, fi.getContextType());
    			pstat.setLong(4, fi.getLength());
    			pstat.setDate(5, new Date(System.currentTimeMillis()));
    			
    			Blob blob = conn.createBlob();
    			OutputStream out = blob.setBinaryStream(1); 
    			out.write(fi.getContent());
    			out.close();
    			pstat.setBlob(6, blob); 
    			
    			pstat.executeUpdate();
    			pstat.close();
    			conn.close();
    		} catch (Exception e) {
    			e.printStackTrace();
    		}
    	}
    	
    	public FileInfo getFileInfoById(Long id)
    	{
    		try {
    			FileInfo fi = new FileInfo();
    			Connection conn=getConnection();
    			String sql = "select * from T_FILE where id=?";
    			PreparedStatement pstat = conn.prepareStatement(sql);
    			pstat.setLong(1, id);
    			ResultSet rs = pstat.executeQuery();
    			if(rs.next())
    			{
    				fi.setId(id);
    				fi.setName(rs.getString("name"));
    				fi.setContextType(rs.getString("contexttype"));
    				fi.setDt(rs.getDate("dt"));
    				fi.setLength(rs.getLong("length"));
    				Blob blob = rs.getBlob("content") ;
    				InputStream input = blob.getBinaryStream();
    				byte[] data = new byte[1024];
    				ByteArrayOutputStream baos = new ByteArrayOutputStream();
    				int pos = 0;
    				while((pos=input.read(data))!=-1)
    					baos.write(data,0,pos);
    				fi.setContent(baos.toByteArray());
    			}
    			pstat.close();
    			conn.close();
    			return fi;
    		} catch (Exception e) {
    			e.printStackTrace();
    		}
    		return null;
    	}
    
    }

## 文件操作类 ##

package com.gufang;
    
    import java.io.InputStream;
    
    import javax.servlet.http.HttpServletRequest;
    
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.util.FileCopyUtils;
    import org.springframework.web.multipart.MultipartFile;
    import org.springframework.web.multipart.MultipartHttpServletRequest;
    
    import com.gufang.model.FileInfo;
    
    
    public class MyFileTool {
    	@Autowired
    	private MyConnection conn;
    	
    	public FileInfo uploadFile(HttpServletRequest req)
    	{
    		if(!(req instanceof MultipartHttpServletRequest))
    			return null;
    		MultipartHttpServletRequest mreq = (MultipartHttpServletRequest)req;
    		MultipartFile multipartFile = mreq.getFile("file");
    		try
    		{
    			InputStream is = multipartFile.getInputStream();
    			byte[] bytes = FileCopyUtils.copyToByteArray(is);
    			FileInfo fi = new FileInfo();
    			fi.setName(multipartFile.getName());
    			fi.setContextType(multipartFile.getContentType());
    			fi.setLength(new Long(multipartFile.getBytes().length));
    			fi.setContent(bytes);
    			conn.saveFileInfo(fi);
    			return fi;
    		}
    		catch(Exception e)
    		{
    			e.printStackTrace();
    		}
    		return null;
    	}
    }

其他类通过源码下载  
https://pan.baidu.com/s/1BUs\_3qT1XaS64Y3w3iCZRg

## 项目中使用自定义Starter ##

## 通过注解方式使用Redis ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FpeGlhbmdfY2hlbg_size_16_color_FFFFFF_t_70]  
修改Application.properties配置文件  
spring.redis.database=0  
spring.redis.host=localhost  
spring.redis.port=6379  
spring.redis.password=  
spring.redis.pool.max-active=8  
spring.redis.pool.max-wait=-1  
spring.redis.pool.max-idle=8  
spring.redis.pool.min-idle=0  
\#spring.redis.timeout=0

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FpeGlhbmdfY2hlbg_size_16_color_FFFFFF_t_70 1]  
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## 文件上传 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FpeGlhbmdfY2hlbg_size_16_color_FFFFFF_t_70 3]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FpeGlhbmdfY2hlbg_size_16_color_FFFFFF_t_70 4]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FpeGlhbmdfY2hlbg_size_16_color_FFFFFF_t_70 5]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FpeGlhbmdfY2hlbg_size_16_color_FFFFFF_t_70 6]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FpeGlhbmdfY2hlbg_size_16_color_FFFFFF_t_70 7]  
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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FpeGlhbmdfY2hlbg_size_16_color_FFFFFF_t_70]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/11/9ba5fae5c7324a39b3463d84cafd5e6f.png
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