本文小编为大家详细介绍“如何解决Spring循环依赖问题”，内容详细，步骤清晰，细节处理妥当，希望这篇“如何解决Spring循环依赖问题”文章能帮助大家解决疑惑，下面跟着小编的思路慢慢深入，一起来学习新知识吧。
公共代码
package com.example.controller;
import com.example.tmp.A;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class HelloController {
@Autowired
private A a;
@GetMapping("/test1")
public String test1() {
return a.getTest();
}
}代码
package com.example.tmp;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
@Component
public class A {
@Autowired
private B b;
private String name = "Tony";
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getTest() {
return b.getAge().toString() + name;
}
}package com.example.tmp;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
@Component
public class B {
@Autowired
private A a;
private Integer age = 20;
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
}测试
启动不报错。
postman访问：http://localhost:8080/test1
后端结果：不报错
postman结果: 20Tony
延迟加载：在注入依赖时，先注入代理对象，当首次使用时再创建对象完成注入。
代码
package com.example.tmp;
import org.springframework.context.annotation.Lazy;
import org.springframework.stereotype.Component;
@Component
public class A {
private B b;
public A(@Lazy B b) {
this.b = b;
}
private String name = "Tony";
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getTest() {
return b.getAge().toString() + name;
}
}package com.example.tmp;
import org.springframework.context.annotation.Lazy;
import org.springframework.stereotype.Component;
@Component
public class B {
private A a;
public B(@Lazy A a) {
this.a = a;
}
private Integer age = 20;
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
}测试
启动不报错。
postman访问：http://localhost:8080/test1
后端结果：不报错
postman结果: 20Tony
代码
package com.example.tmp;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
@Component
public class A {
private B b;
private String name = "Tony";
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getTest() {
return b.getAge().toString() + name;
}
public B getB() {
return b;
}
@Autowired
public void setB(B b) {
this.b = b;
}
}package com.example.tmp;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
@Component
public class B {
private A a;
private Integer age = 20;
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
public A getA() {
return a;
}
@Autowired
public void setA(A a) {
this.a = a;
}
}测试
启动不报错。
postman访问：http://localhost:8080/test1
后端结果：不报错
postman结果: 20Tony
代码
package com.example.tmp;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import javax.annotation.PostConstruct;
@Component
public class A {
@Autowired
private B b;
@PostConstruct
public void init() {
b.setA(this);
}
private String name = "Tony";
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getTest() {
return b.getAge().toString() + name;
}
}package com.example.tmp;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
@Component
public class B {
@Autowired
private A a;
private Integer age = 20;
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
public A getA() {
return a;
}
public void setA(A a) {
this.a = a;
}
}测试
启动不报错。
postman访问：http://localhost:8080/test1
后端结果：不报错
postman结果: 20Tony
代码
package com.example.tmp;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;
@Component
public class A implements ApplicationContextAware, InitializingBean {
private B b;
private ApplicationContext context;
private String name = "Tony";
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getTest() {
return b.getAge().toString() + name;
}
@Override
public void afterPropertiesSet() throws Exception {
this.b = context.getBean(B.class);
}
@Override
public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
this.context = applicationContext;
}
}package com.example.tmp;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
@Component
public class B {
@Autowired
private A a;
private Integer age = 20;
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
}测试
启动不报错。
postman访问：http://localhost:8080/test1
后端结果：不报错
postman结果: 20Tony
读到这里，这篇“如何解决Spring循环依赖问题”文章已经介绍完毕，想要掌握这篇文章的知识点还需要大家自己动手实践使用过才能领会，如果想了解更多相关内容的文章，欢迎关注亿速云行业资讯频道。
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