Google Guice 依赖注入方式

　　Google Guice有三种依赖注入方式。

 

　　一。Field注入

 

package com.template.guice;

import com.google.inject.Inject;

/**
 * Created by IntelliJ IDEA.
 * User: Zhong Gang
 * Date: 11-8-2
 * Time: 下午9:39
 */
public class CommentServiceImpl implements CommentService {

    @Inject
    private CommentDao commentDao;

    @Override
    public void comment() {
        commentDao.comment("This is a comment message!");
    }
}

 

　　二。Constructor注入

 

package com.template.guice;

import com.google.inject.Inject;

/**
 * Created by IntelliJ IDEA.
 * User: Zhong Gang
 * Date: 11-8-2
 * Time: 下午9:39
 */
public class CommentServiceImpl implements CommentService {

    private CommentDao commentDao;

    @Inject
    public CommentServiceImpl(CommentDao commentDao) {
        this.commentDao = commentDao;
    }

    @Override
    public void comment() {
        commentDao.comment("This is a comment message!");
    }
}

 

 

　　三。Setter注入

 

package com.template.guice;

import com.google.inject.Inject;

/**
 * Created by IntelliJ IDEA.
 * User: Zhong Gang
 * Date: 11-8-2
 * Time: 下午9:39
 */
public class CommentServiceImpl implements CommentService {

    private CommentDao commentDao;
    
    @Override
    public void comment() {
        commentDao.comment("This is a comment message!");
    }

    @Inject
    public void setCommentDao(CommentDao commentDao) {
        this.commentDao = commentDao;
    }
}