idea创建基于maven的ssm项目【7】完成新增学生信息api

本节操作将完成新增用户的api，并进行测试。

1、前提约束

• 安装好mysql数据库
• 数据库具有student database
• 账号root，密码zhangli【请根据实际情况确定】
• 在student database中有t_student表
• t_student表结构为 ( id int, name varchar(20))，且主键自增

2、创建net.wanho.entity.Student.java类，与t_stu对应，即实体类

package net.wanho.entity;

import java.io.Serializable;

public class Student implements Serializable {
    private int id;
    private String name;

    public Student() {
    }

    public Student(int id, String name) {
        this.id = id;
        this.name = name;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    @Override
    public String toString() {
        return "Student{" +
                "id=" + id +
                ", name='" + name + '\'' +
                '}';
    }
}

3、创建net.wanho.mapper.StudentMapper.java接口。

package net.wanho.mapper;

import net.wanho.entity.Student;

public interface StudentMapper {

    void add(Student student) throws Exception;
}

4、创建net/wanho/mapper/StudentMapper.xml【此文件应与上述接口同名】。

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="net.wanho.mapper.StudentMapper">
    <!--id的值与接口中方法名同名，parameterType即方法的参数类型，
        useGeneratedKeys即使用自增主键，keyProperty定义了主键-->
    <insert id="add" parameterType="net.wanho.entity.Student" useGeneratedKeys="true" keyProperty="id">
        insert into t_student(name) values(#{name})
    </insert>
</mapper>

5、创建net.wanho.service.StudentServiceI.java接口

package net.wanho.service;

import net.wanho.entity.Student;

public interface StudentServiceI {
    void addStudent(Student student)throws Exception;
}

6、创建net.wanho.service.impl.StudentServiceImpl.java，即上述接口的实现类

package net.wanho.service.impl;

import net.wanho.entity.Student;
import net.wanho.mapper.StudentMapper;
import net.wanho.service.StudentServiceI;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;

@Service
public class StudentServiceImpl implements StudentServiceI {

    //注入StudentMapper
    @Resource
    private StudentMapper studentMapper;

    public void addStudent(Student student) throws Exception {
        studentMapper.add(student);
    }
}

7、创建net.wanho.controller.StudentController.java，即api的入口类

package net.wanho.controller;

import com.alibaba.fastjson.JSONObject;
import net.wanho.entity.Student;
import net.wanho.service.StudentServiceI;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;

import javax.annotation.Resource;

@Controller
public class StudentController {

    @Resource
    private StudentServiceI studentService;

    @RequestMapping(value="/student/add/{name}",method = RequestMethod.GET)
    @ResponseBody
    public JSONObject addStudent(Student student)
    {
        JSONObject ret = new JSONObject();
        try {
            studentService.addStudent(student);
            ret.put("status",200);
            ret.put("msg","add success:"+student.getId());
        }
        catch(Exception e)
        {
            ret.put("status",100);
            ret.put("msg","add error");
            e.printStackTrace();
        }
        return ret;
    }
}

8、测试1

打开浏览器输入http://localhost:8088/student/add/ali，反复执行，会看到返回的主键一直在自增。具体操作如下图所示：

（测试新增学生api）

也可以采用如下方式查看是否成功。

 

9、测试2

打开mysql命令行，查看表中数据，具体操作如下图所示：

（mysql命令行查看数据是否插入）

 

至此，我们完成了新增学生的api，并且完成了测试。