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/Java
/Spring入门篇
这是什么错误？代码都是按照老师写的
2017-07-24
源自：Spring入门篇 4-2
正在回答
如果自行撰写了构造函数，编译程序就不会自动建立默认构造函数，所以会初始化失败。在private InjectionDAO injectionDAO上 或者 setter上@Autowired的话，而且撰写的带参构造函数没有注释掉，前两者就没有默认构造函数来调用形成实例对象了，所以报错里头会有说no default constructor 还有 initialization失败
复制粘贴就是容易错。。。
@Autowired
private InjectionDAO injectionDAO;
//设置注入
public void setInjectionDAO(InjectionDAO injectionDAO) {
this.injectionDAO = injectionDAO;
}
//构造器注入
public InjectionServiceImpl(InjectionDAO injectionDAO){
this.injectionDAO=injectionDAO;
三个共存就会报错，除非注解在set或构造函数上，不懂得为什么？
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