SpringBoot简单的实现Junit单元测试和集成MyBatis分页

版权声明：本文为博主原创文章，如需转载请标明出去。 https://blog.csdn.net/sujin_/article/details/79849772

Spring在依赖注入bean的时候，会把所有实现MyBatis中Interceptor接口的所有类都注入到SqlSessionFactory中，作为plugin存在。既然如此，我们集成一个plugin便很简单了，只需要使用@Bean创建PageHelper对象即可。

1.创建数据库

create table t_book
(
  book_id int primary key auto_increment,          -- ID
  book_name varchar(50) not null,                  -- 书名
  book_price float not null,                       -- 价格
  book_brief varchar(256)                          -- 简介
);-- 记得添加数据

2.pom.xml中添加集成Mybatis分页的相关依赖

<!--Spring Boot集成MyBatis分页-->
		<dependency>
			<groupId>com.github.pagehelper</groupId>
			<artifactId>pagehelper</artifactId>
			<version>4.1.0</version>
		</dependency>

3.创建实体类

package com.king.s5.model;

public class Book {
    private Integer bookId;

    private String bookName;

    private Float bookPrice;

    private String bookBrief;

    public Book(Integer bookId, String bookName, Float bookPrice, String bookBrief) {
        this.bookId = bookId;
        this.bookName = bookName;
        this.bookPrice = bookPrice;
        this.bookBrief = bookBrief;
    }

    public Book() {
        super();
    }

    public Integer getBookId() {
        return bookId;
    }

    public void setBookId(Integer bookId) {
        this.bookId = bookId;
    }

    public String getBookName() {
        return bookName;
    }

    public void setBookName(String bookName) {
        this.bookName = bookName;
    }

    public Float getBookPrice() {
        return bookPrice;
    }

    public void setBookPrice(Float bookPrice) {
        this.bookPrice = bookPrice;
    }

    public String getBookBrief() {
        return bookBrief;
    }

    public void setBookBrief(String bookBrief) {
        this.bookBrief = bookBrief;
    }

    @Override
    public String toString() {
        return "Book{" +
                "bookId=" + bookId +
                ", bookName='" + bookName + '\'' +
                ", bookPrice=" + bookPrice +
                ", bookBrief='" + bookBrief + '\'' +
                '}';
    }
}

4.创建接口和实现类

public interface IBookBiz {

    void addBook(Book book);

    List<Book> listBooks(Book book, PageBean pageBean);

}

package com.king.s5.biz.impl;

import com.king.s5.biz.IBookBiz;
import com.king.s5.mapper.BookMapper;
import com.king.s5.model.Book;
import com.king.s5.util.PageBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class BookBizImpl implements IBookBiz {

    @Autowired
    private BookMapper bookMapper;

    @Override
    public void addBook(Book book) {
        bookMapper.insertSelective(book);
    }

    @Override
    public List<Book> listBooks(Book book, PageBean pageBean) {
        return bookMapper.listBooks(book);
    }
}

注意：mapper中的类和xml我就不写了，可以用mybatis插件-mybatis-generator自动生成，需要学习的可以在在下方留言

5.创建测试类

1.先创建一个baseCaseTest(公共的基础类)，可以减少代码量，进行代码优化。

package com.king.s5;

import com.github.pagehelper.PageHelper;
import com.king.s5.biz.IBookBiz;
import com.king.s5.model.Book;
import com.king.s5.util.PageBean;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import org.springframework.test.context.web.WebAppConfiguration;

import java.util.List;

@RunWith(SpringJUnit4ClassRunner.class)
@SpringBootTest
@WebAppConfiguration
public class BaseCaseTest{

    protected Book book;
    protected PageBean pageBean;

    @Before
    public void setUp() throws Exception {
        book = new Book();
        pageBean = new PageBean();
    }

    @After
    public void tearDown() throws Exception {
    }
}

2.注册一个MyBatis分页插件PageHelper的实体类

package com.king.s5.util;

import java.util.Properties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import com.github.pagehelper.PageHelper;

/**
 * mybatis配置类. 
 * @author Angel baby--守护天使 
 * @version v.0.1
 * @date 2018年4月8日
 */
@Configuration
public class MyBatisConfiguration {

    /**
     * 注册MyBatis分页插件PageHelper 
     * @return
     */
    @Bean
    public PageHelper pageHelper() {
        System.out.println("MyBatisConfiguration.pageHelper()");
        PageHelper pageHelper = new PageHelper();
        Properties p = new Properties();
        p.setProperty("offsetAsPageNum", "true");
        p.setProperty("rowBoundsWithCount", "true");
        p.setProperty("reasonable", "true");
        pageHelper.setProperties(p);
        return pageHelper;
    }
} 

3.添加分页所需要的工具类

package com.king.s5.util;

import javax.servlet.http.HttpServletRequest;
import java.io.Serializable;
import java.util.Map;

public class PageBean implements Serializable {

	private static final long serialVersionUID = -7544706514503688395L;

	private int curPage = 1;// 当前页
	private int pageRecord = 2;// 页大小
	private int totalRecord;// 总记录数

	private boolean paginate = true;/* 是否分页，默认分页 */

	private String url;
	private Map<String, String[]> parameterMap;

	public PageBean() {
		super();
	}

	/**
	 * 初始化分页数据
	 * 
	 * @param request
	 */
	public void setRequest(HttpServletRequest request) {
		this.setCurPage(request.getParameter("curPage"));
		this.setPageRecord(request.getParameter("pageRecord"));
		this.setPaginate(request.getParameter("paginate"));
		this.url = request.getContextPath() + request.getServletPath();
		this.parameterMap = request.getParameterMap();

		// 兼容easyui的页码page、页大小rows
		String rows = request.getParameter("rows");
		String page = request.getParameter("page");
		if (null != rows && null != page) {
			this.setCurPage(request.getParameter("page"));
			this.setPageRecord(request.getParameter("rows"));
		}
	}

	public boolean isPaginate() {
		return paginate;
	}

	public void setPaginate(boolean paginate) {
		this.paginate = paginate;
	}

	public void setPaginate(String paginate) {
		paginate = null == paginate ? "" : paginate.trim();
		if ("false".equalsIgnoreCase(paginate)) {
			this.paginate = false;
		} else {
			this.paginate = true;
		}
	}

	private void setPageRecord(String pageRecord) {
		if (null != pageRecord && !"".equals(pageRecord.trim())) {
			this.pageRecord = Integer.parseInt(pageRecord);
		}
	}

	private void setCurPage(String curPage) {
		if (null != curPage && !"".equals(curPage.trim())) {
			this.curPage = Integer.parseInt(curPage);
		}
	}

	public String getUrl() {
		return url;
	}

	public void setCurPage(int curPage) {
		this.curPage = curPage;
	}

	public void setPageRecord(int pageRecord) {
		this.pageRecord = pageRecord;
	}

	public Map<String, String[]> getParameterMap() {
		return parameterMap;
	}

	public int getTotalRecord() {
		return totalRecord;
	}

	public void setTotalRecord(int totalRecord) {
		this.totalRecord = totalRecord;
	}

	public void setTotalRecord(String totalRecord) {
		this.totalRecord = Integer.valueOf(totalRecord);
	}

	public int getCurPage() {
		return curPage;
	}

	public int getPageRecord() {
		return pageRecord;
	}

	public int getMaxPageNumber() {
		int maxPageNumber = this.totalRecord / this.pageRecord;
		maxPageNumber = totalRecord % pageRecord == 0 ? maxPageNumber : maxPageNumber + 1;
		return maxPageNumber;
	}

	public int getNextPageNumber() {
		int nextPageNumber = this.curPage + 1;
		nextPageNumber = nextPageNumber > this.getMaxPageNumber() ? this.getMaxPageNumber() : nextPageNumber;
		return nextPageNumber;
	}

	public int getPreviousPageNumber() {
		int previousPageNumber = this.curPage - 1;
		previousPageNumber = previousPageNumber < 1 ? 1 : previousPageNumber;
		return previousPageNumber;
	}

	public int getStartIndex() {
		return (this.curPage - 1) * this.pageRecord;
	}

	public int getEndIndex() {
		return this.curPage * this.pageRecord - 1;
	}

	@Override
	public String toString() {
		return "PageBean [curPage=" + curPage + ", pageRecord=" + pageRecord + ", totalRecord=" + totalRecord + "]";
	}

}

4.创建实现类的测试类

package com.king.s5.biz.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import com.king.s5.BaseCaseTest;
import com.king.s5.BaseTest;
import com.king.s5.biz.IBookBiz;
import com.king.s5.model.Book;
import com.king.s5.util.PageBean;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.springframework.beans.factory.annotation.Autowired;

import java.util.ArrayList;
import java.util.List;

import static org.junit.Assert.*;

public class BookBizImplTest extends BaseCaseTest {

    @Autowired
    private IBookBiz bookBiz;
//    private Book book;
//    private PageBean pageBean;
//
//    @Before
//    public void setUp() throws Exception {
//        book = new Book();
//        pageBean = new PageBean();
//    }
//
//    @After
//    public void tearDown() throws Exception {
//    }

    @Override
    public void setUp() throws Exception {
        super.setUp();
    }

    @Test
    public void addBook() throws Exception {
    }

    @Test
    public void listBooks() throws Exception {
        PageHelper.startPage(pageBean.getCurPage(),pageBean.getPageRecord());//curPage起始页,pageRecored页大小
        List<Book> appsList = bookBiz.listBooks(book,pageBean);
        
        // 需要把Page包装成PageInfo对象才能序列化。该插件也默认实现了一个PageInfo
//        PageInfo<Book> pageInfo = new PageInfo<Book>(appsList);


//        System.out.println(appsList+"  =========== ");

        for(Book b:appsList){
            System.out.println(b);
        }
//        System.out.println(pageInfo);
    }
}

注意：如果项目报错，出不来，是因为没有加相应的注解，如果加了还出不来，那就是你哪一个环节有问题

application.properties中配置mybatis	mybatis.mapper-locations=classpath*:mapper/*.xml#加载映射
springApplication类中加	@SpringBootApplication
springApplication类中加	@MapperScan("com.king.s5.mapper")//将项目中对应的mapper类的路径加进来就可以了

springboot的一些注解

@SpringBootApplication	申明让spring boot自动给程序进行必要的配置，这个配置等同于：@Configuration ，@EnableAutoConfiguration 和 @ComponentScan 三个配置。
@Configuration	等同于spring的XML配置文件；使用Java代码可以检查类型安全。
@Component	可配合CommandLineRunner使用，在程序启动后执行一些基础任务。
@Autowired	自动导入。
@PathVariable	获取参数。
@Bean	用@Bean标注方法等价于XML中配置的bean。
@Value	注入Spring boot application.properties配置的属性的值
@Controller	用于定义控制器类，在spring 项目中由控制器负责将用户发来的URL请求转发到对应的服务接口（service层），一般这个注解在类中，通常方法需要配合注解@RequestMapping
@ResponseBody	比如异步获取json数据，加上@responsebody后，会直接返回json数据

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