java - 如何从 xml @Autowired(注入(inject))。无法 Autowiring 。未找到 'DAO' 类型的 beans

Question

我的 beans.xml

<bean id = "DAO" class = "com.price.compare.service.DAO" scope="singleton" init-method="init">
    <constructor-arg index="0" type = "java.lang.String" value="localhost"/>
    <constructor-arg index="1" type = "java.lang.String" value="5432"/>
    ..
</bean>

Java Controller

@Controller
@RequestMapping(value = "/addproduct")
public class NewProductController {
   @Autowired
   private DAO database;  
   ...

DAO 类

public class DAO {
private final String host;
private final String port;
private final String user;
private final String password;

private Connection connection;

public DAO(String host, String port, String user, String password) {
    this.host = host;
    this.port = port;
    this.user = user;
    this.password = password;
}


public void init() {
    connection = connect();
    if(testSelection()) {
        System.out.println("Connection to db successfully established");
    }
}

@Autowired私有(private) DAO 数据库； <--- 给出消息“无法 Autowiring 。未找到‘DAO’类型的 beans。”

Answer 1

你应该添加 <context:component-scan base-package="packageName"/>进入 beans.xml其中packageName是DAO的包