因為項目需要，需要在項目運行過程中能夠動態修改數據源（即：數據源的熱更新）。這里以com.alibaba.druid.pool.DruidDataSource數據源為例

這里為什么要重寫這個類：因為DruidDataSource數據源在初始化后，就不允許再重新設置數據庫的url和userName

public void setUrl(String jdbcUrl) { if (StringUtils.equals(this.jdbcUrl, jdbcUrl)) { return; } // 重寫的時候，需要將這個判斷注釋掉，否則會報錯 // if (inited) { // throw new UnsupportedOperationException(); // } if (jdbcUrl != null) { jdbcUrl = jdbcUrl.trim(); } this.jdbcUrl = jdbcUrl; // if (jdbcUrl.startsWith(ConfigFilter.URL_PREFIX)) { // this.filters.add(new ConfigFilter()); // } } public void setUsername(String username) { if (StringUtils.equals(this.username, username)) { return; }// 重寫的時候，需要將這個判斷注釋掉，否則會報錯 // if (inited) { // throw new UnsupportedOperationException(); // } this.username = username; }

重寫的時候包路徑不能變，只有這樣類加載的時候才會優先加載重寫后的類

package com.mp.demo.config;import com.alibaba.druid.pool.DruidDataSource;import lombok.Data;import lombok.extern.slf4j.Slf4j;import org.springframework.beans.factory.annotation.Value;import org.springframework.cloud.context.config.annotation.RefreshScope;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;@Slf4j@Configuration@RefreshScope@Datapublic class DruidConfiguration{ @Value('${spring.datasource.url}') private String dbUrl; @Value('${spring.datasource.username}') private String username; @Value('${spring.datasource.password}') private String password; @Value('${spring.datasource.driver-class-name}') private String driverClassName; @Bean @RefreshScope public DruidDataSource dataSource() { DruidDataSource datasource = new DruidDataSource(); datasource.setUrl(this.dbUrl); datasource.setUsername(username); datasource.setPassword(password); datasource.setDriverClassName(driverClassName); return datasource; }}

這里要注意增加@RefreshScope注解

@GetMapping('/refresh') public String refresh() throws SQLException { DruidDataSource master = SpringUtils.getBean('dataSource'); master.setUrl(druidConfiguration.getDbUrl()); master.setUsername(druidConfiguration.getUsername()); master.setPassword(druidConfiguration.getPassword()); master.setDriverClassName(druidConfiguration.getDriverClassName()); master.restart(); return userName + '<>' + jdbcUrl+'----------'+druidConfiguration.getDbUrl(); }

源碼地址：https://gitee.com/jackson_hou/RefreshDataSource.git

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