我've created a spring application using spring-security with java based configuration. I'还在我的项目中包含了一个jar文件（由我创建） . 我面临的问题是： - 我必须在两个类（ SpringConfig.java and SecurityConfig.java ）中编写 @ComponentScan(basePackages = {"com.mypackage"}) ，这会导致bean初始化两次 . 删除@componentscan中的任何一个都会导致错误： - Error creating bean with name 'securityConfig' .
以下是我的java课程 .
SpringConfig.java
package com.mypackage.config;
import javax.annotation.PostConstruct;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
@EnableWebMvc
@Configuration
@ComponentScan(basePackages = {"com.mypackage"})
public class SpringConfig extends WebMvcConfigurerAdapter {
private static final Logger logger = LoggerFactory.getLogger(SpringConfig.class);
@PostConstruct
public void init(){
logger.debug("Spring Config initialized");
}
}
SecurityConfig.java
package com.mypackage.config;
import javax.annotation.PostConstruct;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
@Configuration
@EnableWebSecurity
@ComponentScan(basePackages = {"com.mypackage"})
public class SecurityConfig extends WebSecurityConfigurerAdapter{
private static final Logger logger = LoggerFactory.getLogger(SecurityConfig.class);
//This Configuration class is in my jar file.
// with package starting with same name com.mypackage
@Autowired
com.mypackage.frameworks.config.Configuration config;
@PostConstruct
public void init(){
logger.debug("Security config initiaziled");
}
@Autowired
public void configureGlobal(AuthenticationManagerBuilder auth) {
try {
auth.inMemoryAuthentication()
.withUser("admin").password("admin").roles("USER");
} catch (Exception e) {
e.printStackTrace();
}
}
}
MyController.java
package com.mypackage.controller;
import javax.annotation.PostConstruct;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Controller;
@Controller
public class MyController {
private static final Logger logger = LoggerFactory.getLogger(MyController.class);
@PostConstruct
public void init(){
logger.debug("-------Controller created-------");
}
}
2 回答
Bean将被配置和创建两次，因为两个应用程序上下文都扫描相同的包“com.mypackage” . 一种解决方案是将SpringConfig bean包与SecurityConfig bean包分开 . 尽可能在@ComponentScan包值中更具体
您已将bean定义配置为多个@Configuration类 . 我的建议是 - 将 @Configuration 类与 @Import 聚合成一个单独的位置 . 现在，您可以在一个地方应用 @ComponentScan(basePackages = {"com.mypackage"}) ，上下文也只能加载一次bean .
@Import 注释提供了这种支持，它直接等同于Spring bean XML文件中的 **** 元素 . 请参考此链接 - https://docs.spring.io/spring-javaconfig/docs/1.0.0.M4/reference/html/ch04s03.html