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[英]what is the purpose of spring boot autowired annotation on a constructor?
[英]Is @Autowired annotation mandatory on constructor in Spring boot
如果我使用構造函數DI,是否必須強制使用@Autowired
?
@Autowired注釋對於構造函數是必需的嗎?
沒有。
在Spring 4.3之后,如果您的類只有單個構造函數,則無需放置@Autowired
。
在Spring 4.3之前 :
package com.example.service;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
@Service
public class DatabaseAccountService implements AccountService {
private final RiskAssessor riskAssessor;
@Autowired
public DatabaseAccountService(RiskAssessor riskAssessor) {
this.riskAssessor = riskAssessor;
}
// ...
}
后:
@Service
public class DatabaseAccountService implements AccountService {
private final RiskAssessor riskAssessor;
public DatabaseAccountService(RiskAssessor riskAssessor) {
this.riskAssessor = riskAssessor;
}
// ...
}
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