搭建maven+springmvc+mybatis

首先说明一下，搭建springmvc+mybatis整整花费了两天的功夫，主要问题就是jar包冲突、配置文件有误等问题，也有教程本身可能存在问题，因此本次就重新搭建了一次。

首先看一下目录结构，这个就是完整的maven+springmvc+mybatis目录。

第一步：使用maven搭建springmvc动态网站

【注意】在完成后，还需要手动进入工程文件夹，从跟目录src开始新建三个文件夹

main/java

test/java

test/resources

刷新项目工程，就成为了动态web项目。

第二步：新建springmvc+mybatis

在完成动态web的搭建后，现在要加入springmvc和mybatis项目的支持。pom.xml文件如下：

  4.0.0
  jianghuiwen.youhua
  springmvc
  war
  0.0.1-SNAPSHOT
  springmvc Maven Webapp
  http://maven.apache.org
    
        UTF-8  
        3.1.1.RELEASE  
        3.8.1  
      
  
    
      junit
      junit
      3.8.1
      test
    
    
	log4j
	log4j
	1.2.17

    
    
		
			org.mybatis
			mybatis
			3.3.0
		
		
		
			org.mybatis
			mybatis-spring
			1.2.2
		
    
		
			mysql
			mysql-connector-java
			5.1.30
		
		
	org.springframework
	spring-jdbc
	${springversion}

		
	org.springframework
	spring-context-support
	${springversion}

		
    
org.springframework
spring-web
${springversion}


org.springframework
spring-webmvc
${springversion}


	org.springframework
	spring-core
	${springversion}


        commons-dbcp
        commons-dbcp
        1.4
    
      
            javax.servlet  
            servlet-api  
            2.5  
            provided  
         

	org.springframework
	spring-dao
	2.0.8



	org.springframework
	spring-context
	${springversion}

  
  
    springmvc
  

web.xml中增加对springmvc和mybatis的启动支持

	
	
		index.jsp
	
	
		
	
		org.springframework.web.util.Log4jConfigListener
	
	
	
	
		book
		org.springframework.web.servlet.DispatcherServlet
		
			contextConfigLocation
			/WEB-INF/spring-servlet.xml
		
		1
	
	
	  
        contextConfigLocation  
        classpath:applicationContext.xml  
     
    
	
		org.springframework.web.context.ContextLoaderListener
	
	
		book
		/
	

spring-servlet.xml

对日志的支持log4j.properties：

#定义LOG输出级别
log4j.rootLogger=INFO,Console,File
#定义日志输出目的地为控制台
log4j.appender.Console=org.apache.log4j.ConsoleAppender
log4j.appender.Console.Target=System.out
#可以灵活地指定日志输出格式，下面一行是指定具体的格式
log4j.appender.Console.layout = org.apache.log4j.PatternLayout
log4j.appender.Console.layout.ConversionPattern=[%c] - %m%n

#文件大小到达指定尺寸的时候产生一个新的文件
log4j.appender.File = org.apache.log4j.RollingFileAppender
#指定输出目录
log4j.appender.File.File = logs/ssm.log
#定义文件最大大小
log4j.appender.File.MaxFileSize = 10MB
# 输出所以日志，如果换成DEBUG表示输出DEBUG以上级别日志
log4j.appender.File.Threshold = ALL
log4j.appender.File.layout = org.apache.log4j.PatternLayout
log4j.appender.File.layout.ConversionPattern =[%p] [%d{yyyy-MM-dd HH\:mm\:ss}][%c]%m%n

mybatis的支持applicationContext.xml

上面就是配置文件，下面就是mybatis对于数据库的操作接口

/springmvc/src/main/java/click/youhua/mapper/StudentMapper.java

package click.youhua.mapper;

import click.youhua.model.Student;
/*
 * mybatis接口，完成对数据库的映射，即在service层调用该接口的时候，直接可以操作对应的Mapper.xml中的SQL语句
 * 因此要求该类名需要和数据库映射文件名字相同.例如：StudentMapper.java -- studentMapper.xml
 * */
public interface StudentMapper {
	public Student findById(Long id);
	public void addStudent(Student student);
}

studentMapper.xml

    
	
		select id, name , age from student where id = #{id} limit 1
	
	
  insert into student(name, age) values(#{name}, #{age})

完成上面的配置后，就可以配置service层和controller层了。

/springmvc/src/main/java/click/youhua/service/impl/StudentServiceImpl.java

package click.youhua.service.impl;

import javax.annotation.Resource;

import org.springframework.stereotype.Service;

import click.youhua.mapper.StudentMapper;
import click.youhua.model.Student;
import click.youhua.service.StudentService;


@Service("studentService")
public class StudentServiceImpl implements StudentService{
	@Resource
	private StudentMapper studentMapper;
	@Override
	public Student findById(Long id){
		return studentMapper.findById(id);
	}
	@Override
	public void addStudent(Student student) {
		studentMapper.addStudent(student);
	}
}

/springmvc/src/main/java/click/youhua/controller/IndexController.java

package click.youhua.controller;

import java.util.HashMap;
import java.util.Map;

import javax.annotation.Resource;

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.servlet.ModelAndView;

import click.youhua.model.Student;
import click.youhua.service.StudentService;


@Controller  
@RequestMapping(value = "/index") 
public class IndexController {

	@Autowired
	private StudentService studentService;
	
	@RequestMapping(value="/list")  
    public ModelAndView list(){  
		System.out.println("index...");
		Map data = new HashMap();  
	    data.put("name",studentService.findById(3L).getName());
        return new ModelAndView("index",data); 
    }  
	
	@RequestMapping(value = "/add")  
    public String add(){  
		System.out.println("add...");
		Student student = new Student();
		student.setId(3L);
		student.setName("hongwen");
		student.setAge(20L);
		studentService.addStudent(student);
        return "index"; 
    }  
}

当然，我还多加了一个拦截器，拦截器没做什么。

/springmvc/src/main/java/click/youhua/interceptor/LoginInterceptor.java

package click.youhua.interceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

public class LoginInterceptor implements HandlerInterceptor {

	@Override
	public void afterCompletion(HttpServletRequest arg0,
			HttpServletResponse arg1, Object arg2, Exception arg3)
			throws Exception {
		
	}

	@Override
	public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1,
			Object arg2, ModelAndView arg3) throws Exception {
		
	}

	@Override
	public boolean preHandle(HttpServletRequest arg0, HttpServletResponse arg1,
			Object arg2) throws Exception {
		System.out.println("拦截器拦截啦！");
		return false;
	}

}

【注意】我的数据库表很简单，就是一个数据库名：test，数据库表:student 字段：id name age。

启动tomcat访问，可以看到：