Spring4 根据类型自动装配属性类型为java.util.Properties

Answer 1

No need for get set method

@Value("#{propertiesReader}")
public Properties props;

@Value("#{propertiesReader['username']}")
public String username;

Answer 2

Since you want to inject the entire properties, you should write:

@Value("#{propertiesReader}")
public void setProps(Properties props) {
    this.props = props;
}

instead of

@Value("#{propertiesReader[username]}")