【SSM】任务列表案例 基本CRUD SSM整合

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一、案例功能预览

Github 地址 ： ssm-integration-part

二、接口分析

• 学习计划分页查询

/* 
需求说明查询全部数据页数据
请求urischedule/{pageSize}/{currentPage}
请求方式 get   
响应的json{"code":200,"flag":true,"data":{//本页数据data:[{id:1,title:'学习java',completed:true},{id:2,title:'学习html',completed:true},{id:3,title:'学习css',completed:true},{id:4,title:'学习js',completed:true},{id:5,title:'学习vue',completed:true}], //分页参数pageSize:5, // 每页数据条数 页大小total:0 ,   // 总记录数currentPage:1 // 当前页码}}
*/

• 学习计划删除

/* 
需求说明根据id删除日程
请求urischedule/{id}
请求方式 delete
响应的json{"code":200,"flag":true,"data":null}
*/

• 学习计划保存

/* 
需求说明增加日程
请求urischedule
请求方式 post
请求体中的JSON{title: '',completed: false}
响应的json{"code":200,"flag":true,"data":null}
*/

• 学习计划修改

/* 
需求说明根据id修改数据
请求urischedule
请求方式 put
请求体中的JSON{id: 1,title: '',completed: false}
响应的json{"code":200,"flag":true,"data":null}
*/

三、前端工程导入

vscode 需要用管理员模式启动 下载依赖

npm install //安装依赖
npm run dev //运行测试

四、后端程序实现和测试

4.1 准备

• 数据库

CREATE TABLE schedule (id INT NOT NULL AUTO_INCREMENT,title VARCHAR(255) NOT NULL,completed BOOLEAN NOT NULL,PRIMARY KEY (id)
);INSERT INTO schedule (title, completed)
VALUES('学习java', true),('学习Python', false),('学习C++', true),('学习JavaScript', false),('学习HTML5', true),('学习CSS3', false),('学习Vue.js', true),('学习React', false),('学习Angular', true),('学习Node.js', false),('学习Express', true),('学习Koa', false),('学习MongoDB', true),('学习MySQL', false),('学习Redis', true),('学习Git', false),('学习Docker', true),('学习Kubernetes', false),('学习AWS', true),('学习Azure', false);

• pojo

@Data
public class Schedule {private Integer id;private String title;private Boolean completed;
}

• 工具类
  • com.wake.utils

package com.wake.utils;/*** 返回结果类*/
public class R {private int code = 200; //200成功状态码private boolean flag = true; //返回状态private Object data;  //返回具体数据public  static R ok(Object data){R r = new R();r.data = data;return r;}public static R  fail(Object data){R r = new R();r.code = 500; //错误码r.flag = false; //错误状态r.data = data;return r;}public int getCode() {return code;}public void setCode(int code) {this.code = code;}public boolean isFlag() {return flag;}public void setFlag(boolean flag) {this.flag = flag;}public Object getData() {return data;}public void setData(Object data) {this.data = data;}
}

@Data
@NoArgsConstructor
@AllArgsConstructor
public class PageBean<T> {private int currentPage;   // 当前页码private int pageSize;      // 每页显示的数据量private long total;    // 总数据条数private List<T> data;      // 当前页的数据集合
}

4.2 功能实现

4.2.1 分页查询显示

• controller

@RestController
@RequestMapping("schedule")
@Slf4j
public class ScheduleController {@Autowiredprivate ScheduleService scheduleService;@GetMapping("/{pageSize}/{currentPage}")public R page(@PathVariable int pageSize,@PathVariable int currentPage) {R r = scheduleService.page(pageSize,currentPage);log.info("查询信息为：{}",r);return r;}
}

• service

public interface ScheduleService {/*** 分页查询信息* @param pageSize* @param currentPage* @return*/R page(int pageSize, int currentPage);
}

@Service
public class ScheduleServiceImpl implements ScheduleService {@Autowiredprivate ScheduleMapper scheduleMapper;@Overridepublic R page(int pageSize, int currentPage) {PageHelper.startPage(currentPage,pageSize);List<Schedule> scheduleList =  scheduleMapper.queryList();PageInfo<Schedule> info = new PageInfo<>(scheduleList);PageBean<Schedule> data = new PageBean<>(currentPage,pageSize,info.getTotal(),info.getList());return R.ok(data);}
}

• mapper

public interface ScheduleMapper {/*** 查询显示全部计划表信息* @return*/List<Schedule> queryList();
}

<mapper namespace="com.wake.mapper.ScheduleMapper"><select id="queryList" resultType="com.wake.pojo.Schedule">select * from schedule</select>
</mapper>

• result

4.2.2 添加计划

实体类 加上不能为空注解

@Data
public class Schedule {private Integer id;@NotBlankprivate String title;@NotNullprivate Boolean completed;
}

• controller

    @PostMappingpublic R save(@Validated @RequestBody Schedule schedule, BindingResult result){if (result.hasErrors()){return R.fail("参数为空Null！不能保存！");}R r = scheduleService.add(schedule);return r;}

• service

    @Overridepublic R add(Schedule schedule) {int row = scheduleMapper.insert(schedule);return row > 0 ? R.ok(null) : R.fail(null);}

• Mapper

    /*** 增加一条数据* @param schedule* @return*/int insert(Schedule schedule);

• result
  

4.2.2 删除计划

• controller

    @DeleteMapping("/{id}")public R remove(@PathVariable Integer id){R r = scheduleService.remove(id);return r;}

• service

    /*** 根据ID删除日程* @param id* @return*/R remove(Integer id);

    @Overridepublic R remove(Integer id) {int row = scheduleMapper.deleteById(id);if(row > 0){return R.ok(null);}else{return R.fail(null);}}

• Mapper

    /*** 根据ID删除日程* @param id* @return*/int deleteById(Integer id);

    <delete id="deleteById">delete from schedule where id = #{id}</delete>

• result
  
  
  

4.2.3 修改计划

• controller

    @PutMappingpublic R update(@Validated @RequestBody Schedule schedule, BindingResult result){if (result.hasErrors()){return R.fail("参数为空Null！不能修改！");}R r = scheduleService.update(schedule);return r;}

• service

    @Overridepublic R update(Schedule schedule) {//判断ID为空if (schedule.getId() == null){return R.fail("ID不能为空！");}int row = scheduleMapper.update(schedule);if (row > 0) {return R.ok(null);}return R.fail(null);}

• Mapper

    <update id="update">update schedule set title = #{title},completed = #{completed} where id = #{id}</update>

• result
  

4.3 前后联调

跨域问题：

前端是 node 服务器
后端是 tomcat 服务器

解决：
在controller类上加注解*（也可以单独加方法上）*

@CrossOrigin //允许其他源访问，浏览器就不会拦截

success！