利用java如何实现在删除信息后刷新页面功能

发布时间：2020-11-17 14:25:49

来源：亿速云

阅读：74

作者：Leah

这篇文章给大家介绍利用java如何实现在删除信息后刷新页面功能，内容非常详细，感兴趣的小伙伴们可以参考借鉴，希望对大家能有所帮助。

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 list=new ArrayList();

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 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 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 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 deleteCorpGroup(List idList,Long groupId);

②：//根据条件查询对应的条目总数

ServiceResult getTotalCount(Long groupId);

#dubbo接口的serviceImpl层#

①：//删除分组下的学生

@Override

public ServiceResult deleteCorpGroup(List idList, Long groupId) {

ServiceResult 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 getTotalCount(Long groupId) {

ServiceResult 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 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 from student_group where group_id = #{groupId} and id in

open="(" close=")">

#{id}

②：//根据条件查询对应的条目总数

SELECT COUNT(1)

FROM student_group

where group_id = #{groupId}

#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;

}

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