mybatis+servlet

实现两个功能-增加信息、信息查询

结构目录

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.wxy</groupId>
    <artifactId>annotation</artifactId>
    <version>1.0-SNAPSHOT</version>

    <dependencies>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.4.5</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.16</version>
        </dependency>
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.12</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.10</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.web</groupId>
            <artifactId>javax.servlet.jsp.jstl</artifactId>
            <version>1.2.4</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet.jsp.jstl</groupId>
            <artifactId>jstl-api</artifactId>
            <version>1.2</version>
            <scope>provided</scope>
        </dependency>

        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>jsp-api</artifactId>
            <version>2.2</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>
        <dependency>
            <groupId>javax</groupId>
            <artifactId>javaee-api</artifactId>
            <version>7.0</version>
        </dependency>

        <dependency>
            <groupId>taglibs</groupId>
            <artifactId>standard</artifactId>
            <version>1.1.2</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.1.41</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.7.5</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>1.7.5</version>
        </dependency>
    </dependencies>
</project>

userdao.java

package com.wxy.dao;
import com.wxy.domain.user;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Select;
import java.util.List;
public interface userdao {
    //用户的持久层接口
    @Insert("insert into emp(empid,first_name,salary) values(#{empid},#{first_name},#{salary})")
    void saveuser(user u);
    @Select("select * from emp where salary>500")
    List<user> findall();
}

user.java

package com.wxy.domain;
import java.io.Serializable;
public class user implements Serializable {
    private Integer empid;
    private String first_name;
    private Integer salary;
    //public static List<user> a;
    public void setEmpid(Integer empid) {
        this.empid = empid;
    }

    public void setFirst_name(String first_name) {
        this.first_name = first_name;
    }

    public void setSalary(Integer salary) {
        this.salary = salary;
    }

    public Integer getEmpid() {
        return empid;
    }

    public String getFirst_name() {
        return first_name;
    }

    public Integer getSalary() {
        return salary;
    }

    @Override
    public String toString() {
        return "user{" +
                "empid=" + empid +
                ", first_name=" + first_name +
                ", salary=" + salary +
                "}
";
    }
}

addservlet.java

package com.wxy.servlet;
import com.wxy.dao.userdao;
import com.wxy.domain.user;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.net.URL;
import java.util.List;
public class addservlet extends HttpServlet {
    private static final long serialVersionUID=1L;
    public void doGet(HttpServletRequest request,HttpServletResponse resp) throws FileNotFoundException {
        String resource="./mybatis-config.xml";
        URL o=Thread.currentThread().getContextClassLoader().getResource("");
        String path=o.getPath().replace("classes","classes");
        InputStream in;
        in=new FileInputStream(new File(path+resource));
        SqlSessionFactory sqlSessionFactory=new SqlSessionFactoryBuilder().build(in);
        SqlSession session=sqlSessionFactory.openSession();
        userdao userdao=(userdao)session.getMapper(userdao.class);
        user a = new user();
        a.setEmpid(Integer.parseInt(request.getParameter("empid")));
        a.setFirst_name(request.getParameter("first_name"));
        a.setSalary(Integer.parseInt(request.getParameter("salary")));
        userdao.saveuser(a);
        List<user> list=userdao.findall();
        System.out.println(list.toString());
        session.close();
    }
}

mybatis-config.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mtbatis.org/dtd/mybatis-3-config.dtd">
<!-- mybatis的主配置文件 -->
<configuration>
    <!-- 配置环境 -->
    <environments default="mysql">
        <!-- 配置MySQL的环境 -->
        <environment id="mysql">
            <transactionManager type="JDBC"></transactionManager>
            <!-- 配置数据源（连接池 -->
            <dataSource type="POOLED">
                <!-- 配置联接数据库的四个基本信息 -->
                <property name="driver" value="com.mysql.cj.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql://localhost:3306/mybatis?characterEncoding=utf8&amp;useSSL=false"/>
                <property name="username" value="root"/>
                <property name="password" value="2999029aaa"/>
            </dataSource>
        </environment>
    </environments>
    <!-- 指定映射配置文件的位置，映射文件指的是每个dao独立时配置文件 -->
    <mappers>
        <mapper class="com.wxy.dao.userdao"/>
        <!--
        <mapper resource="usersMaooing.xml"/>
        -->
    </mappers>
</configuration>

add.xml

<%@ page contentType="text/html;charset=UTF-8" language="java"
         import="com.wxy.domain.user" %>
<html>
<head>
    <body>
      <form action="addd" method="get">
          empid:<input type="text" name="empid" value=""/><br/>
          first_name:<input type="text" name="first_name" value=""><br/>
          salary:<input type="text" name="salary"value=""><br/>
          <input type="submit" value="增加"/>
      </form>
    </body>
</head>
</html>

测试结果：