ssm项目启动的时候 修改 配置文件 定义的值

import org.springframework.beans.factory.InitializingBean;
import org.springframework.core.env.ConfigurableEnvironment;import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.nio.charset.StandardCharsets;public class PasswordInitializer implements InitializingBean {private final ConfigurableEnvironment environment;public PasswordInitializer(ConfigurableEnvironment environment) {this.environment = environment;}@Overridepublic void afterPropertiesSet() throws IOException {String encryptedUsername = environment.getProperty("jdbc.username");
//        String decryptedUsername = decryptUsername(encryptedUsername);writeDecryptedPasswordToFile(encryptedUsername);verifyFileContent(encryptedUsername);}//修改private void writeDecryptedPasswordToFile(String decryptedPassword) {try (BufferedWriter writer = new BufferedWriter(new FileWriter("ty-jdbc.properties"))) {writer.write("jdbc.username=" + "decryptedPassword");} catch (IOException e) {throw new RuntimeException("Failed to write decrypted password to ty-jdbc.properties", e);}}//修改后查询private void verifyFileContent(String expectedValue) throws IOException {try (BufferedReader reader = new BufferedReader(new FileReader("ty-jdbc.properties"))) {String line;while ((line = reader.readLine()) != null) {if (line.startsWith("jdbc.username=")) {String actualValue = line.split("=")[1].trim();if (actualValue.equals("decryptedPassword")) {System.out.println("Successfully updated jdbc.username in ty-jdbc.properties.");return;} else {System.err.println("Update failed: Expected value does not match the one in file.");return;}}}System.err.println("Update failed: jdbc.username property not found in ty-jdbc.properties.");}}}

xml 随便一个文件加上这个

        <bean id="passwordInitializer" class="文件包名.PasswordInitializer" init-method="afterPropertiesSet"/>

或者用这种方式

import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.env.ConfigurableEnvironment;import javax.annotation.PostConstruct;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.nio.charset.StandardCharsets;@Configuration
public class PasswordInitializer {private final ConfigurableEnvironment environment;public PasswordInitializer(ConfigurableEnvironment environment) {this.environment = environment;}@PostConstructpublic void initialize() throws IOException {String encryptedUsername = environment.getProperty("jdbc.connectionSecret");
//        String decryptedUsername = decryptUsername(encryptedUsername);//方式 1
// 设置系统属性System.setProperty("spring.profiles.active", "1235456");// 读取系统属性String activeProfile = System.getProperty("spring.profiles.active");System.out.println("1111"+activeProfile);
//方式 2String password = "123456";writeDecryptedPasswordToFile(password);verifyFileContent(password);}private void writeDecryptedPasswordToFile(String decryptedPassword) {try (BufferedWriter writer = new BufferedWriter(new FileWriter("ty-jdbc.properties"))) {writer.write("jdbc.connectionSecret=" + decryptedPassword);} catch (IOException e) {throw new RuntimeException("Failed to write decrypted password to ty-jdbc.properties", e);}}private void verifyFileContent(String expectedValue) throws IOException {try (BufferedReader reader = new BufferedReader(new FileReader("ty-jdbc.properties"))) {String line;while ((line = reader.readLine()) != null) {if (line.startsWith("jdbc.connectionSecret")) {System.out.println("111111" +line);String actualValue = line.split("=")[1].trim();if (actualValue.equals(expectedValue)) {System.out.println("Successfully updated jdbc.username in ty-jdbc.properties.");return;} else {System.err.println("Update failed: Expected value does not match the one in file.");return;}}}System.err.println("Update failed: jdbc.username property not found in ty-jdbc.properties.");}}}