java实现删除某条信息并刷新当前页操作

我就废话不多说了，大家还是直接看代码吧~

//执行的是删除信息的操作
 String a=request.getParameter("name");
 a = URLEncoder.encode(a, "ISO-8859-1");
 String name = URLDecoder.decode(a, "UTF-8");
 String num=request.getParameter("num");
 System.out.println("name:"+name+"num:"+num);
 String sql="delete from person_info where name=? and num=?";
 String sz[]={name,num};
 JdbcUtils.update(sql, sz);
 //刷新操作
 String sqls="select * from person_info";
 ResultSet rs=JdbcUtils.select(sqls, null);
 ArrayList<Person_info> list=new ArrayList<Person_info>();
 try {
 while(rs.next()){
 Person_info pi=new Person_info(rs.getString(1), rs.getString(2), rs.getString(3), rs.getString(4), rs.getString(5), rs.getString(6));
 list.add(pi);
 }
 request.setAttribute("list", list);
 request.getRequestDispatcher("Personnel_definition.jsp").forward(request, response);
 } catch (SQLException e) {
 // TODO Auto-generated catch block
 e.printStackTrace();
 } 
 
 }

补充知识：关于分页时怎么实现当本页面最后一条记录被删除时,自动向上一个页面跳转的实现（java实现）

##问题详解

在做批量删除时，发现若批量删除整页时，会自动跳到第一页首页，而不是返回删除当前页的上一页，不符合产品要求且使界面交互不好，给用户带来糟糕体验。

##思路详解

在controller层传参时要考虑到不仅要传入需要删除的id集合，同时传入pageSize,pageNum以及总条数集合的查询条件（如：本示例会传入groupId(分组id)）,在删除成功后初始化当前页，先根据查询条件查询出总条数数量，在pageSize不等于null或为0的情况下。算出余数[（pageSize*pageNum-count）%pageSize ].若余数为0，则当前页等于pageNum-1;若余数不为0，则当前页=pageNum.将结果当前页传给前台即可。

##后台代码实现

#controller层#

@Api(description = "分组下的学生",value = "分组下的学生")
@RestController
@RequestMapping("studentGroup")
public class StudentGroupController {
 @Autowired
 private RestStudentGroupService restStudentGroupService;

 @RequestMapping(value = "deleteGroupStudent",method = RequestMethod.POST)
 @ApiOperation(value = "删除分组中的学生",notes = "删除分组中的学生")
 public ResponseObj deleteGroupStudent(@RequestParam(value = "groupId",required = true)Long groupId,
   @RequestParam(value = "ids",required = true)String ids,
   @RequestParam(value = "pageSize",required = false)Integer pagesize,
   @RequestParam(value = "pageNum",required = false)Integer pageNum){

 return restStudentGroupService.deleteGroupStudent(groupId,ids,pagesize,pageNum);
 }
 }

#service层#

@FeignClient(value = ServiceName.VALUE)
public interface RestStudentGroupService {

 @RequestMapping(value = "/school/cloud/student/deleteGroupStudent",method = RequestMethod.POST)
 public ResponseObj deleteGroupStudent(@RequestParam(value = "groupId")Long groupId,
   @RequestParam(value = "ids")String ids,
   @RequestParam(value = "pageSize")Integer pagesize,
   @RequestParam(value = "pageNum")Integer pageNum);
   }

#serviceImpl层#

@Service
public class RestStudentGroupServiceImpl implements RestStudentGroupService {

 @Autowired
 private DubboStudentGroupService dubboStudentGroupService ;
 @Override
 public ResponseObj deleteGroupStudent(Long groupId,String ids,Integer pageSize,Integer pageNum) {

 List<Long> idList = TextUtils.split(ids);
 if(groupId == null || idList== null || idList.size() == 0){
 ResponseObj responseObj = ResponseObj.ERROR("参数错误");
 responseObj.setSuccess(true);
 return responseObj;
 }
 ServiceResult<Long> serviceResult = dubboStudentGroupService .deleteCorpGroup(idList, groupId);
 if(!serviceResult.getSuccess()){
 throw new RuntimeException("分组下学生查询失败");
 }
 //应前端要求加此dto，封装传给前台的当前页属性
 CurrenPageDto currenPageDto=new CurrenPageDto();
 //初始化当前页
 Integer currentPage = 1;
 //查出该分组id下的学生数量
 ServiceResult<Long> itemCountLongs = dubboStudentGroupService.getTotalCount(groupId);
 Long itemCountLong= itemCountLongs.getResult();
 Integer itemCount = itemCountLong!=null ? itemCountLong.intValue() : 0;
 //"查询到学生数量：{},pageSize:{}", itemCount,pageSize;
 if(pageSize != null && pageSize != 0){
 //算出余数
 Integer temp = (pageNum*pageSize-itemCount)%pageSize;
 if(temp == 0){
 //余数为0的话就pageNum-1
 currentPage = (pageNum - 1) == 0 ? 1 : (pageNum -1) ;
 }else {
 //余数不为0则等于pageNum
 currentPage = pageNum;
 }
 currenPageDto.setPresentPage(currentPage);
 }
 ResponseObj responseObj = ResponseObj.SUCCESS();
 responseObj.setData(currenPageDto);
 return responseObj;
 }
}

#dubbo接口的service层#

①：//删除分组下的学生
ServiceResult<Long> deleteCorpGroup(List<Long> idList,Long groupId);
②：//根据条件查询对应的条目总数
ServiceResult<Long> getTotalCount(Long groupId);

#dubbo接口的serviceImpl层#

①：//删除分组下的学生
 @Override
 public ServiceResult<Long> deleteCorpGroup(List<Long> idList, Long groupId) {
 ServiceResult<Long> result = new ServiceResult<>();

 try {
 studentGroupDao.deleteCorpGroup(idList, groupId);
 } catch (Exception e) {
 log.error("调用{}方法 异常", "[RestStudentGroupServiceImpl .deleteCorpGroup]");
 log.error("方法使用参数：[idList:{},groupId:{}]", idList, groupId);
 log.error("异常信息：{}", e);
 result.setErrMessage("调用deleteCorpGroup方法异常，异常信息：" + e.getMessage());
 }

 return result;
 }
②：//根据条件查询对应的条目总数
 @Override
 public ServiceResult<Long> getTotalCount(Long groupId) {
 ServiceResult<Long> result = new ServiceResult<>();

 try {
 long count = studentGroupDao.getFindCorpGroupDirectoryCount(groupId);
 result.setResult(count);
 } catch (Exception e) {
 log.error("调用{}方法 异常", "[RestStudentGroupServiceImpl .getTotalCount]");
 log.error("方法使用参数：[groupId:{}]", groupId);
 log.error("异常信息：{}", e);
 result.setErrMessage("调用getTotalCount方法异常，异常信息：" + e.getMessage());
 }
 return result;
 }

#dubbo接口的dao层#

①：//删除分组下的学生
 Long deleteCorpGroup(@Param(value = "idList") List<Long> idList,@Param(value = "groupId") Long groupId);
②：//根据条件查询对应的条目总数
Long getFindCorpGroupDirectoryCount(@Param(value = "groupId") Long groupId);

#dubbo接口的sql#

①：//删除分组下的学生
 <delete id="deleteCorpGroup">
 delete from student_group where group_id = #{groupId} and id in
 <foreach collection="idList" index="index" separator="," item="id"
  open="(" close=")">
 #{id}
 </foreach>
 </delete>
②：//根据条件查询对应的条目总数
 <select id="getFindCorpGroupDirectoryCount" resultType="long">
 SELECT COUNT(1)
 FROM student_group 
 where group_id = #{groupId}
 </select>

#Entity类(学生分组类)#（get,set函数省略）

public class StudentGroup implements java.io.Serializable {
 
 /**
 * 
 */
 private static final long serialVersionUID = 1L;
 /**
 * @描述: 
 * @字段:id BIGINT(19) 
 */ 
 private Long StudentGroupId;

 /**
 * @描述: 
 * @字段:group_id BIGINT(19) 
 */ 
 private Long groupId;

 /**
 * @描述: 
 * @字段:id BIGINT(19) 
 * 此id为学生表id
 */ 
 private Long id;

 /**
 * @描述:创建时间 
 * @字段:create_time DATETIME(19) 
 */ 
 private java.util.Date createTime;

 * @描述:创建人用户名 
 * @字段:create_user_name VARCHAR(30) 
 */ 
 private String createUserName;

 /**
 * @描述:创建人用户ID 
 * @字段:create_user_id BIGINT(19) 
 */ 
 private Long createUserId;

 /**
 * @描述:更新时间 
 * @字段:update_time DATETIME(19) 
 */ 
 private java.util.Date updateTime;

 * @描述:更新人用户名 
 * @字段:update_user_name VARCHAR(30) 
 */ 
 private String updateUserName;

 /**
 * @描述:更新人用户ID 
 * @字段:update_user_id BIGINT(19) 
 */ 
 private Long updateUserId;
 }

#Entity类(学生类)#（get,set函数省略）

public class Student implements java.io.Serializable {
 /**
 * 
 */
 private static final long serialVersionUID = 1L;

 private Long id;
 private String name ;
 private Integer age;
 }

以上这篇java实现删除某条信息并刷新当前页操作就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持呐喊教程。

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