Java后台实现方法

时间：2021-01-20 17:22:25

Java后台实现方法

首先后台结构分为四个部分（以表schedule为例）

entity>mapper>service>controller


1. 在entity里面写好实体，新建目录schedule，再建子文件Schedule.java,在里面定义好全部表名的字段

package com.eisp.eoms.entity.schedule;

import java.sql.Timestamp;

//日志信息

public class Schedule {

    private Long scheId;

    private String schCode;

    private String userCode;

    private String orgCode;

    private String scheduleContent;

    private Timestamp startDate;

    private Timestamp endDate;

    private String comments;

}

2.在mapper里面写好接口

建立schedule目录，再建立ScheduleMapper.java文件

里面写sql语句

/**

 * @author Administrator

 *

 */

package com.eisp.eoms.mapper.schedule;

import java.util.List;

import com.eisp.eoms.entity.schedule.Schedule;

public interface ScheduleMapper {

    List<Schedule>selectByUserCode(String userCode);

    List<Schedule>select();

}

//select和selectByUserCode名称不能一样

再建立ScheduleMapper.xml文件，里面写sql语

<?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="com.eisp.eoms.mapper.schedule.ScheduleMapper">

<select id="select" resultType="com.eisp.eoms.entity.schedule.Schedule">

    select * from EOMS_SCHEDULE

</select>

<select id="selectByUserCode" parameterType="String"

    resultType="com.eisp.eoms.entity.schedule.Schedule">

    select * from EOMS_SCHEDULE where USERCODE=#{param1}

</select>

</mapper>

//id相应ScheduleMapper.java中的select方法

3.在service层建立schedule目录。再建立ScheduleService.java文件，里面写的语句例如以下

package com.eisp.eoms.service.schedule;

import java.util.List;

import com.eisp.eoms.entity.schedule.Schedule;

public interface ScheduleService {

    List<Schedule> selectByUserCode(String userCode);

    List<Schedule> select();

}

再建立impl文件，里面建立ScheduleServiceImpl.java文件

package com.eisp.eoms.service.schedule.impl;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Service;

import com.eisp.eoms.entity.schedule.Schedule;

import com.eisp.eoms.mapper.schedule.ScheduleMapper;

import com.eisp.eoms.service.schedule.ScheduleService;

@Service

public class ScheduleServiceImpl implements ScheduleService {

@Autowired

private ScheduleMapper scheduleMapper;

public List<Schedule> selectByUserCode(String userCode) {

    return scheduleMapper.selectByUserCode(userCode);

}

public List<Schedule> select() {

    return scheduleMapper.select();

}

}

4.在controller新建schedule文件件。里面建业务文件SonntagController.java文件用于接收数据

package com.eisp.eoms.controller.schedule;

import java.util.HashMap;

import java.util.Map;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Controller;

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

import org.springframework.web.bind.annotation.ResponseBody;

import org.springframework.web.servlet.ModelAndView;

import com.eisp.eoms.service.schedule.ScheduleService;

@Controller

@RequestMapping("/schedule/sonntag")

public class SonntagController {

@Autowired

private ScheduleService scheduleService;

@RequestMapping("/showIndex")

public ModelAndView scheduleIndex() {

    return new ModelAndView("schedule/index");

}

@RequestMapping("/list")

@ResponseBody

public Map<String, Object> listAll() {

    Map<String, Object> data = new HashMap<String, Object>();

    data.put("list", scheduleService.select());

    data.put("AAA", scheduleService.select());

    System.out.println(data);

    return data;

}

}

总结，经过以上几个环节。后台数据库表的数据可以成功调取出来。当然假设要载入到页面上。还须要js中用ajax传输

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