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  • spring boot使用java读取配置文件,DateSource测试,BomCP测试,AnnotationConfigApplicationContext的DataSource注入

    一、配置注解读取配置文件
            （1）@PropertySource可以指定读取的配置文件，通过@Value注解获取值
      实例：
              @PropertySource(value = {"classpath:jdbc.properties"})  
         注意如果是多个配置文件配置，用逗号隔开
               @PropertySource(value = {"classpath:jdbc.properties","classpath:jdbc.properties"})
    配置注解的顺序不是必须的，可以任意
      （2）如果配置文件不存在如何处理，用注解中自带的方法标注。
      实例：
               @PropertySource(value = {"classpath:jdbc.properties"},ignoreResourceNotFound = true)
    二、读取配置文件案例
        实战：
         1、建立BoneCPDataSource代替XML文档      
     1 package com.liuyangfirst.conf;
 2 
 3 import com.jolbox.bonecp.BoneCPDataSource;
 4 //import com.liuyangfirst.dao.UserDao;
 5 import org.springframework.beans.factory.annotation.Value;
 6 import org.springframework.context.annotation.Bean;
 7 import org.springframework.context.annotation.ComponentScan;
 8 import org.springframework.context.annotation.Configuration;
 9 import org.springframework.context.annotation.PropertySource;
10 
11 import javax.sql.DataSource;
12 
13 /**
14  * Created by liuya
15  * User: liuya
16  * Date: 2018/3/24
17  * Time:  22:06
18  * projectName:20180324versionone
19  */
20 
21 @Configuration
22 @PropertySource(value = {"classpath:jdbc.properties"}, ignoreResourceNotFound = true)
23 public class SpringConf {
24 
25     @Value("${jdbc.url}")
26     private String jdbcUrl;
27 
28     @Value("${jdbc.driverClassName}")
29     private String jdbcDriverClassName;
30 
31     @Value("${jdbc.username}")
32     private String jdbcUsername;
33 
34     @Value("${jdbc.password}")
35     private String jdbcPassword;
36 
37     @Bean(destroyMethod = "close",name = "dataSource")
38     public DataSource dataSource() {
39         BoneCPDataSource boneCPDataSource = new BoneCPDataSource();
40         // 数据库驱动
41         boneCPDataSource.setDriverClass(jdbcDriverClassName);
42         // 相应驱动的jdbcUrl
43         boneCPDataSource.setJdbcUrl(jdbcUrl);
44         // 数据库的用户名
45         boneCPDataSource.setUsername(jdbcUsername);
46         // 数据库的密码
47         boneCPDataSource.setPassword(jdbcUsername);
48         // 检查数据库连接池中空闲连接的间隔时间，单位是分，默认值：240，如果要取消则设置为0
49         boneCPDataSource.setIdleConnectionTestPeriodInMinutes(60);
50         // 连接池中未使用的链接最大存活时间，单位是分，默认值：60，如果要永远存活设置为0
51         boneCPDataSource.setIdleMaxAgeInMinutes(30);
52         // 每个分区最大的连接数
53         boneCPDataSource.setMaxConnectionsPerPartition(100);
54         // 每个分区最小的连接数
55         boneCPDataSource.setMinConnectionsPerPartition(5);
56         return boneCPDataSource;
57     }
58 
59 
60 }
    View Code

        2、建立jdbc.properties，写入需要配置的信息

    1 jdbc.driverClassName=com.mysql.jdbc.Driver
2 jdbc.url=jdbc:mysql://localhost:3306/taotao?characterEncoding=utf8&useUnicode=true&autoReconnect=true&allowMultiQueries=true
3 jdbc.username=root
4 jdbc.password=123456
    View Code

       3、配置pom.xml

      1 <?xml version="1.0" encoding="UTF-8"?>
  2 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  3          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  4     <modelVersion>4.0.0</modelVersion>
  5 
  6     <groupId>com.liuyangfirst</groupId>
  7     <artifactId>20180330versiontwo</artifactId>
  8     <version>0.0.1-SNAPSHOT</version>
  9     <packaging>war</packaging>
 10 
 11     <name>20180330versiontwo</name>
 12     <description>Demo project for Spring Boot</description>
 13     <url>http://maven.apache.org</url>
 14 
 15     <properties>
 16         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 17         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
 18         <java.version>1.8</java.version>
 19         <junit.version>4.12</junit.version>
 20     </properties>
 21     <parent>
 22         <groupId>org.springframework.boot</groupId>
 23         <artifactId>spring-boot-starter-parent</artifactId>
 24         <version>1.4.1.RELEASE</version>
 25     </parent>
 26 
 27     <dependencies>
 28         <!-- JUnit -->
 29         <dependency>
 30             <groupId>junit</groupId>
 31             <artifactId>junit</artifactId>
 32             <version>${junit.version}</version>
 33             <scope>test</scope>
 34         </dependency>
 35         <dependency>
 36             <groupId>org.springframework</groupId>
 37             <artifactId>spring-webmvc</artifactId>
 38             <version>4.3.7.RELEASE</version>
 39         </dependency>
 40 
 41         <dependency>
 42             <groupId>org.springframework</groupId>
 43             <artifactId>spring-test</artifactId>
 44             <version>4.3.9.RELEASE</version>
 45         </dependency>
 46         <dependency>
 47             <groupId>org.springframework</groupId>
 48             <artifactId>spring-test</artifactId>
 49             <version>4.3.9.RELEASE</version>
 50         </dependency>
 51         <dependency>
 52             <groupId>org.springframework.boot</groupId>
 53             <artifactId>spring-boot-starter-test</artifactId>
 54             <scope>test</scope>
 55         </dependency>
 56         <dependency>
 57             <groupId>junit</groupId>
 58             <artifactId>junit</artifactId>
 59             <version>4.12</version>
 60         </dependency>
 61         <dependency>
 62             <groupId>org.springframework.boot</groupId>
 63             <artifactId>spring-boot-test</artifactId>
 64             <version>RELEASE</version>
 65         </dependency>
 66         <dependency>
 67             <groupId>org.springframework.boot</groupId>
 68             <artifactId>spring-boot</artifactId>
 69             <version>2.0.0.RELEASE</version>
 70         </dependency>
 71         <dependency>
 72             <groupId>org.springframework.boot</groupId>
 73             <artifactId>spring-boot-autoconfigure</artifactId>
 74             <version>1.4.1.RELEASE</version>
 75         </dependency>
 76 
 77         <dependency>
 78             <groupId>javax.servlet.jsp</groupId>
 79             <artifactId>jsp-api</artifactId>
 80             <version>2.2</version>
 81             <scope>provided</scope>
 82         </dependency>
 83 
 84         <dependency>
 85             <groupId>javax.servlet</groupId>
 86             <artifactId>servlet-api</artifactId>
 87             <version>2.5</version>
 88             <scope>provided</scope>
 89         </dependency>
 90 
 91         <dependency>
 92             <groupId>commons-logging</groupId>
 93             <artifactId>commons-logging</artifactId>
 94             <version>1.2</version>
 95         </dependency>
 96 
 97         <!-- 连接池 -->
 98         <dependency>
 99             <groupId>com.jolbox</groupId>
100             <artifactId>bonecp-spring</artifactId>
101             <version>0.8.0.RELEASE</version>
102         </dependency>
103 
104         <dependency>
105             <groupId> org.apache.cassandra</groupId>
106             <artifactId>cassandra-all</artifactId>
107             <version>0.8.1</version>
108 
109             <exclusions>
110                 <exclusion>
111                     <groupId>org.slf4j</groupId>
112                     <artifactId>slf4j-log4j12</artifactId>
113                 </exclusion>
114                 <exclusion>
115                     <groupId>log4j</groupId>
116                     <artifactId>log4j</artifactId>
117                 </exclusion>
118             </exclusions>
119         </dependency>
120 
121         <dependency>
122             <groupId>org.slf4j</groupId>
123             <artifactId>slf4j-simple</artifactId>
124             <version>1.7.25</version>
125         </dependency>
126         <!-- MySql 5.5 Connector -->
127         <dependency>
128             <groupId>mysql</groupId>
129             <artifactId>mysql-connector-java</artifactId>
130             <version>5.1.13</version>
131         </dependency>
132 
133         <dependency>
134             <groupId>com.google.guava</groupId>
135             <artifactId>guava</artifactId>
136             <version>21.0</version>
137         </dependency>
138 
139     </dependencies>
140 
141     <build>
142         <finalName>${project.artifactId}</finalName>
143         <plugins>
144             <!-- 资源文件拷贝插件 -->
145             <plugin>
146                 <groupId>org.apache.maven.plugins</groupId>
147                 <artifactId>maven-resources-plugin</artifactId>
148                 <configuration>
149                     <encoding>UTF-8</encoding>
150                 </configuration>
151             </plugin>
152             <!-- java编译插件 -->
153             <plugin>
154                 <groupId>org.apache.maven.plugins</groupId>
155                 <artifactId>maven-compiler-plugin</artifactId>
156                 <configuration>
157                     <source>1.7</source>
158                     <target>1.7</target>
159                     <encoding>UTF-8</encoding>
160                 </configuration>
161             </plugin>
162         </plugins>
163     </build>
164 
165 </project>
    View Code

       4、测试数据库联通

     1 package com.liuyangfirst.test;
 2 
 3 import com.liuyangfirst.conf.SpringConf;
 4 import org.springframework.context.annotation.AnnotationConfigApplicationContext;
 5 import javax.sql.DataSource;
 6 import java.sql.Connection;
 7 import java.sql.ResultSet;
 8 import java.sql.SQLException;
 9 import java.sql.Statement;
10 
11 /**
12  * Created by liuya
13  * User: liuya
14  * Date: 2018/3/30
15  * Time:  22:56
16  * projectName:20180330versiontwo
17  */
18 public class TestDateSource {
19 
20     public static void main(String[] args) {
21         // 通过Java配置来实例化Spring容器
22         AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(SpringConf.class);
23 
24         DataSource dataSource = context.getBean(DataSource.class);
25 
26         Connection connection = null;
27 
28         try {
29             connection = dataSource.getConnection();
30             if (connection != null) {
31                 System.out.println("Connection successful!");
32                 Statement stmt = connection.createStatement();
33                 ResultSet rs = stmt.executeQuery(" select * from tb_user "); // do something with the connection.
34                 while (rs.next()) {
35                     System.out.println(rs.getString(1)); // should print out "1"'
36                     System.out.println(rs.getString(2)); // should print out "1"'
37                 }
38             }
39         } catch (SQLException e) {
40             e.printStackTrace();
41         } finally {
42             try {
43                 connection.close();
44             } catch (SQLException e) {
45                 e.printStackTrace();
46             }
47         }
48     }
49 }
    View Code

      5、测试结果
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  • 原文地址：https://www.cnblogs.com/liuyangfirst/p/8679352.html
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