spring整合mybatis逆向工程+PageHelper插件

原生的mybatis需要手写sql语句，项目数据库表多了之后，可以让你写sql语句写到手软，于是mybatis官方提供了mybatis-generator：mybatis逆向工程代码生成工具，用于简化mybatis单表操作。

在PageHelper3.几的版本的时候，使用它对逆向工程生成的查询方法进行分页时出现失效的情况，而PageHelper4开始，亲测能够与mybatis逆向工程生成的方法完美兼容，今天就和大家分享spring+mybatis+PageHelper的一个整合小案例

第一步：创建maven工程，编写pom.xml

 
  
	
		4.12
		4.3.10.RELEASE
		
		3.4.1
		
		1.3.0
		5.1.32
		1.6.4
		
		2.8.8
		
		1.0.9
		4.3.5
		1.2
		2.5
		2.0
		2.5
		3.3.2
		1.3.2
		3.3
		
		4.1.0
		
		0.9.1
		1.3.1
		2.7.2
		4.10.3
		2.5.3
		3.4.7
		0.1
		5.11.2
		2.3.23
		2.2.2
	
	
	
		
		
			joda-time
			joda-time
			${joda-time.version}
		
		
		
			org.apache.commons
			commons-lang3
			${commons-lang3.version}
		
		
			org.apache.commons
			commons-io
			${commons-io.version}
		
		
			commons-net
			commons-net
			${commons-net.version}
		
		
		
			com.fasterxml.jackson.core
			jackson-databind
			${jackson.version}
		
		
		
			org.apache.httpcomponents
			httpclient
			${httpclient.version}
		
		
		
			org.quartz-scheduler
			quartz
			${quartz.version}
		
		
		
			junit
			junit
			${junit.version}
			test
		
		
		
		
			org.mybatis
			mybatis
			${mybatis.version}
		
		
			org.mybatis
			mybatis-spring
			${mybatis.spring.version}
		
		
		
			com.github.pagehelper
			pagehelper
			${pagehelper.version}
		
		
		
			mysql
			mysql-connector-java
			${mysql.version}
		
		
		
			com.alibaba
			druid
			${druid.version}
		
		
		
			org.springframework
			spring-context
			${spring.version}
		
		
			org.springframework
			spring-beans
			${spring.version}
		
		
			org.springframework
			spring-webmvc
			${spring.version}
		
		
			org.springframework
			spring-jdbc
			${spring.version}
		
		
			org.springframework
			spring-aspects
			${spring.version}
		
		
			org.springframework
			spring-jms
			${spring.version}
		
		
			org.springframework
			spring-context-support
			${spring.version}
		
		
		  
            org.springframework  
            spring-test  
            ${spring.version}  
            provided  
		
		
		
		
            org.apache.logging.log4j
            log4j-api
            2.7
        
        
            org.apache.logging.log4j
            log4j-core
            2.7
        
		
             org.apache.logging.log4j
             log4j-web
             2.7
        
		
		
			jstl
			jstl
			${jstl.version}
		
		
			javax.servlet
			servlet-api
			${servlet-api.version}
			provided
		
		
			javax.servlet
			jsp-api
			${jsp-api.version}
			provided
		
		
		
			commons-fileupload
			commons-fileupload
			${commons-fileupload.version}
		
		
		
			redis.clients
			jedis
			${jedis.version}
		
		
		
			org.apache.solr
			solr-solrj
			${solrj.version}
		
		
		
			com.alibaba
			dubbo
			${dubbo.version}
		
		
			org.apache.zookeeper
			zookeeper
			${zookeeper.version}
		
		
			com.github.sgroschupf
			zkclient
			${zkclient.version}
		
		
			org.apache.activemq
			activemq-all
			${activemq.version}
		
		
			org.freemarker
			freemarker
			${freemarker.version}
		
	
  	
  	
  		
			
			
				org.apache.maven.plugins
				maven-resources-plugin
				2.7
				
					UTF-8
				
			
			
			
				org.apache.maven.plugins
				maven-compiler-plugin
				3.2
				
					1.7
					1.7
					UTF-8
				
			
			
			
				org.apache.tomcat.maven
				tomcat7-maven-plugin
				
					8080
					/
				
			
		
  	

第二步：使用mybatis逆向工程工具生成代码:

mybatis-generator 下载地址： 逆向工程工具

该工具并不是我分享的，我也没用过，如果是不能用的，希望能够在评论区告诉我

第三步：将mybatis逆向工程生成的代码复制到我们的项目下

第四步：配置文件相关：

4.1 配置log4j2.xml文件

  
  
    
        
          D:/log4j2/mybatis/genertor/logs/
          error
        
    
    
        
      	
            
                
            
    	
            
                
                
              	  
                    
                  
                    
              
                
                
            
          
        
    
        
            
            
            
            
            
            
            
            
            
            
            
          
                
                
            
    
          
              
                
            
        
      
   

4.2配置spring相关配置文件

applicationContext-dao.xml

application-service.xml

springmvc.xml

注意：这里为了方便阅读及后期扩展，将配置文件进行了分模块拆分，另外，正式的项目应该要加上事务的相关配置，这里不做演示

4.3mybatis相关配置

SqlMapConfig.xml

4.4 数据库链接的properties文件

 db.properties

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/stu?characterEncoding=utf-8
jdbc.username=root
jdbc.password=root

4.5web.xml的配置

  Mybatis-generator
  
    index.html
    index.htm
    index.jsp
    default.html
    default.htm
    default.jsp
  
  	
  	
  
	  characterEncoding
	  org.springframework.web.filter.CharacterEncodingFilter
  
	  encoding
	  UTF-8
  
  
  
  
	  characterEncoding
	  /*
  
  
   
     
        org.apache.logging.log4j.web.Log4jServletContextListener
     
     
         log4jServletFilter
        org.apache.logging.log4j.web.Log4jServletFilter
     
     
         log4jServletFilter
         /*
        REQUEST
         FORWARD
         INCLUDE
         ERROR
     
     
     
       
       
        httpPutFormFilter  
        org.springframework.web.filter.HttpPutFormContentFilter  
      
      
        httpPutFormFilter  
        /*
    
	 
	
  
  
 	 org.springframework.web.context.ContextLoaderListener
  
  
	  contextConfigLocation
	  classpath:spring/applicationContext*.xml
  
  
  
  
	  springmvc
	  org.springframework.web.servlet.DispatcherServlet
	  1
	   
		   contextConfigLocation
		   classpath:spring/springmvc.xml   
	   
  
  
  
  	springmvc
  	
  	/
  
  

第五步：创建service层引用Mapper接口

接口：

package com.stu.service;

import java.util.List;

import com.stu.pojo.TUser;

public interface UserService {
	
	public List getUserInfo( String keywords, Integer page, Integer size);
	
}

实现类：

package com.stu.service.impl;

import java.util.List;

import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import com.stu.dao.TUserMapper;
import com.stu.pojo.TUser;
import com.stu.pojo.TUserExample;
import com.stu.service.UserService;
@Service
public class UserServiceImpl implements UserService {
	@Autowired
	private TUserMapper userMapper;

	@Override
	public List getUserInfo(String keywords, Integer page, Integer size) {
		PageHelper.startPage(page, size);
		TUserExample example = new TUserExample();
		if (!StringUtils.isBlank(keywords)) {
			example.createCriteria().andUsernameLike(keywords + "%");
		}
		List list = userMapper.selectByExample(example);
		PageInfo info = new PageInfo(list);
		System.out.println("页码: "  + info.getPageNum());
		System.out.println("每页大小: "  + info.getSize());
		System.out.println("总页数: "  + info.getPages());
		System.out.println("总记录数: "  + info.getTotal());
		return list;
	}

}

注意:keywords是查询条件，对应表字段---->username

第六步：创建Controller

package com.stu.api.controller;

import java.io.UnsupportedEncodingException;
import java.util.List;

import javax.annotation.Resource;

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

import com.stu.pojo.TUser;
import com.stu.service.UserService;

@RestController
@RequestMapping("/api/v2/users")
public class UserController {
	@Resource
	private UserService userService;
	
	@GetMapping("/")
	public List getUserInfo( String keywords ,Integer page, Integer size){
		System.out.println("page : " + page);
		System.out.println("size : " + size);
		if(keywords != null){
			try {
				keywords=new String(keywords.getBytes("ISO-8859-1"),"UTF-8");
			} catch (UnsupportedEncodingException e) {
				e.printStackTrace();
			}
		}
		List user = userService.getUserInfo(keywords , page, size);
		return user;
	}
	
}

第七步：运行项目 ，测试

1、使用tomcat7:run运行项目

2、在浏览器中输入:http://localhost:8080/api/v2/users/?keyword=张三&page=1&size=2

数据返回成功:

{"data":[{"id":1,"username":"王五","password":null,"state":0,"isdel":false,"addTime":1487644664000,"money":null,"leftMoney":22.1,"remark":null},{"id":2,"username":"张三","password":null,"state":0,"isdel":false,"addTime":1487644811000,"money":null,"leftMoney":22.1,"remark":null}],"meta":{"respCode":0,"respMsg":null,"detail":"OK","url":null},"pagination":{"page":1,"size":2,"totalPage":58,"totalCode":116}}