java学习知识积累-初识spring框架的”依赖注入”

By admin 2015年9月11日 java

2344

控制层注入式@Autowired

控制层代码如下：

package com.springapp.mvc;

import com.springapp.core.FinArticleService;
import com.springapp.model.News;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import java.util.List;

@Controller
@RequestMapping("/")
public class HelloController {

	@Autowired
	private FinArticleService finArticleService;

	@RequestMapping(value = "index.html", method = RequestMethod.GET)
	public String printWelcome(ModelMap model) {

		List<News> newses = finArticleService.getArticleByPage();
		model.addAttribute("newses", newses);

		return "index/index";
	}




}

package com.springapp.mvc;

import com.springapp.core.FinArticleService;

import com.springapp.model.News;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Controller;

import org.springframework.ui.ModelMap;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestMethod;

import java.util.List;

@Controller

@RequestMapping("/")

public class HelloController {

@Autowired

private FinArticleService finArticleService;

@RequestMapping(value = "index.html", method = RequestMethod.GET)

public String printWelcome(ModelMap model) {

List<News> newses = finArticleService.getArticleByPage();

model.addAttribute("newses", newses);

return "index/index";

}

注入业务service文件 “FinArticleService”,并调用getArticleByPage方法。

业务层代码如下：

package com.springapp.core;


import com.springapp.db.NewsMapper;

import com.springapp.model.News;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

/**
 * Created by Administrator on 2015/9/9.
 */
@Service
public class FinArticleService {

    @Autowired
    private NewsMapper newsMapper;

    //前台查询
    public List<News> getArticleByPage(){
        List<News> lists = newsMapper.selectFinNews();
        for(News news : lists){
            double length = getLength(news.getTitle());
            if(length>16){
                news.setTitle(news.getTitle().substring(0,15)+"...");
            }

        }
        return  lists;
    }

    //todo 有时间 试下 根据引文判断
    public static double getLength(String s) {
        double valueLength = 0;
        // 获取字段值的长度，设定两个字节
        for (int i = 0; i < s.length(); i++) {
            // 获取一个字符
            String temp = s.substring(i, i + 1);
            // 判断是否为中文字符
            if (temp.getBytes().length == 1) {
                // 其他字符长度为0.5
                valueLength += 0.5;
            } else {
                // 中文字符长度为1
                valueLength += 1;
            }
        }

        //进位取整
        return  Math.ceil(valueLength);
    }
}

package com.springapp.core;

import com.springapp.db.NewsMapper;

import com.springapp.model.News;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Service;

import java.util.List;

/**

* Created by Administrator on 2015/9/9.

@Service

public class FinArticleService {

@Autowired

private NewsMapper newsMapper;

//前台查询

public List<News> getArticleByPage(){

List<News> lists = newsMapper.selectFinNews();

for(News news : lists){

double length = getLength(news.getTitle());

if(length>16){

news.setTitle(news.getTitle().substring(0,15)+"...");

}

return lists;

}

//todo 有时间试下根据引文判断

public static double getLength(String s) {

double valueLength = 0;

// 获取字段值的长度，设定两个字节

for (int i = 0; i < s.length(); i++) {

// 获取一个字符

String temp = s.substring(i, i + 1);

// 判断是否为中文字符

if (temp.getBytes().length == 1) {

// 其他字符长度为0.5

valueLength += 0.5;

} else {

// 中文字符长度为1

valueLength += 1;

}

//进位取整

return Math.ceil(valueLength);

}

业务层又从DAO注入

NewsMapper代码如下：

package com.springapp.db;

import com.springapp.model.News;
import com.springapp.model.NewsExample;
import java.util.List;
import org.apache.ibatis.annotations.Param;
import org.springframework.stereotype.Repository;

@Repository
public interface NewsMapper {
    /**
     * This method was generated by MyBatis Generator.
     * This method corresponds to the database table tx_news
     *
     * @mbggenerated Wed Sep 09 17:12:11 CST 2015
     */
    int countByExample(NewsExample example);

    /**
     * This method was generated by MyBatis Generator.
     * This method corresponds to the database table tx_news
     *
     * @mbggenerated Wed Sep 09 17:12:11 CST 2015
     */
    int deleteByExample(NewsExample example);

    /**
     * This method was generated by MyBatis Generator.
     * This method corresponds to the database table tx_news
     *
     * @mbggenerated Wed Sep 09 17:12:11 CST 2015
     */
    int deleteByPrimaryKey(Integer id);

    /**
     * This method was generated by MyBatis Generator.
     * This method corresponds to the database table tx_news
     *
     * @mbggenerated Wed Sep 09 17:12:11 CST 2015
     */
    int insert(News record);

    /**
     * This method was generated by MyBatis Generator.
     * This method corresponds to the database table tx_news
     *
     * @mbggenerated Wed Sep 09 17:12:11 CST 2015
     */
    int insertSelective(News record);

    /**
     * This method was generated by MyBatis Generator.
     * This method corresponds to the database table tx_news
     *
     * @mbggenerated Wed Sep 09 17:12:11 CST 2015
     */
    List<News> selectByExampleWithBLOBs(NewsExample example);

    /**
     * This method was generated by MyBatis Generator.
     * This method corresponds to the database table tx_news
     *
     * @mbggenerated Wed Sep 09 17:12:11 CST 2015
     */
    List<News> selectByExample(NewsExample example);

    /**
     * This method was generated by MyBatis Generator.
     * This method corresponds to the database table tx_news
     *
     * @mbggenerated Wed Sep 09 17:12:11 CST 2015
     */
    News selectByPrimaryKey(Integer id);

    /**
     * This method was generated by MyBatis Generator.
     * This method corresponds to the database table tx_news
     *
     * @mbggenerated Wed Sep 09 17:12:11 CST 2015
     */
    int updateByExampleSelective(@Param("record") News record, @Param("example") NewsExample example);

    /**
     * This method was generated by MyBatis Generator.
     * This method corresponds to the database table tx_news
     *
     * @mbggenerated Wed Sep 09 17:12:11 CST 2015
     */
    int updateByExampleWithBLOBs(@Param("record") News record, @Param("example") NewsExample example);

    /**
     * This method was generated by MyBatis Generator.
     * This method corresponds to the database table tx_news
     *
     * @mbggenerated Wed Sep 09 17:12:11 CST 2015
     */
    int updateByExample(@Param("record") News record, @Param("example") NewsExample example);

    /**
     * This method was generated by MyBatis Generator.
     * This method corresponds to the database table tx_news
     *
     * @mbggenerated Wed Sep 09 17:12:11 CST 2015
     */
    int updateByPrimaryKeySelective(News record);

    /**
     * This method was generated by MyBatis Generator.
     * This method corresponds to the database table tx_news
     *
     * @mbggenerated Wed Sep 09 17:12:11 CST 2015
     */
    int updateByPrimaryKeyWithBLOBs(News record);

    /**
     * This method was generated by MyBatis Generator.
     * This method corresponds to the database table tx_news
     *
     * @mbggenerated Wed Sep 09 17:12:11 CST 2015
     */
    int updateByPrimaryKey(News record);

    //查询前台文章
    List<News> selectFinNews();

    //关于我们
    List<News> aboutArticle();
}

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package com.springapp.db;

import com.springapp.model.News;

import com.springapp.model.NewsExample;

import java.util.List;

import org.apache.ibatis.annotations.Param;

import org.springframework.stereotype.Repository;

@Repository

public interface NewsMapper {

/**

* This method was generated by MyBatis Generator.

* This method corresponds to the database table tx_news