@PostMapping("/updateDormitory") public String update(Dormitory dormitory) { int i = dormitoryService.update(dormitory); if (i >0){ return "success"; } else { return "error"; } }

这段代码是一个Spring Boot的Controller方法，使用了@PostMapping注解，表示该方法处理POST请求，并映射到"/updateDormitory"路径上。

该方法接受一个参数dormitory，类型为Dormitory对象，用于接收客户端提交的宿舍信息。

方法内部通过调用dormitoryService的update方法来更新宿舍信息，并将返回值赋给变量i。

如果更新成功（i大于0），则返回字符串"success"，表示更新成功。否则，返回字符串"error"，表示更新失败。

请注意，该代码段仅包含了更新宿舍信息的逻辑，并未包含任何与前端交互和视图渲染的代码。

相关问题

<input type="text" id="dormitory" name="dormitory" readonly="readonly" value="${userinfo.dormitory==null?"待入住":userinfo.dormitory}" class="layui-input"/>如何更改实现在分配后重新读宿舍并写入信息，请给出具体例子

如果你想实现在分配后重新读宿舍并写入信息，你可以在前端页面上添加一个修改宿舍的按钮，当用户点击该按钮时，前端会发送一个Ajax请求到后端，后端会先查询该用户的宿舍信息，然后将查询结果返回给前端，前端再将该宿舍信息显示在一个表单中，用户可以在表单中修改宿舍信息，然后再次点击“保存”按钮，前端会将修改后的宿舍信息发送到后端进行更新。下面是一个具体的例子：

前端代码：

<div class="layui-form-item">
  <label class="layui-form-label">宿舍号</label>
  <div class="layui-input-inline">
    <input type="text" id="dormitory" name="dormitory" readonly="readonly" value="${userinfo.dormitory==null?'待入住':userinfo.dormitory}" class="layui-input"/>
  </div>
  <div class="layui-form-mid layui-word-aux">
    <button class="layui-btn layui-btn-xs" id="changeDormBtn">修改</button>
  </div>
</div>

<div class="layui-form-item layui-hide" id="changeDormForm">
  <label class="layui-form-label">宿舍号</label>
  <div class="layui-input-inline">
    <input type="text" id="newDorm" name="newDorm" class="layui-input"/>
  </div>
  <div class="layui-form-mid layui-word-aux">
    <button class="layui-btn layui-btn-xs" id="saveDormBtn">保存</button>
  </div>
</div>

<script>
$(function() {
  // 显示修改宿舍表单
  $('#changeDormBtn').click(function() {
    $('#dormitory').parent().addClass('layui-hide');
    $('#changeDormForm').removeClass('layui-hide');
  });

  // 保存修改后的宿舍信息
  $('#saveDormBtn').click(function() {
    var newDorm = $('#newDorm').val();
    $.ajax({
      url: '/user/updateDorm',
      type: 'POST',
      data: {newDorm: newDorm},
      success: function(data) {
        if (data.code == 0) {
          $('#dormitory').val(newDorm);
          $('#newDorm').val('');
          $('#changeDormForm').addClass('layui-hide');
          $('#dormitory').parent().removeClass('layui-hide');
          layer.msg('修改成功');
        } else {
          layer.msg('修改失败');
        }
      },
      error: function() {
        layer.msg('网络错误');
      }
    });
  });
});
</script>

后端代码：

@Controller
@RequestMapping("/user")
public class UserController {

  @Autowired
  private UserService userService;

  @PostMapping("/updateDorm")
  @ResponseBody
  public Result updateDorm(@RequestParam("newDorm") String newDorm, HttpSession session) {
    User user = (User)session.getAttribute("user");
    user.setDormitory(newDorm);
    int count = userService.updateUser(user);
    if (count > 0) {
      return Result.success();
    } else {
      return Result.fail();
    }
  }
}

这里假设你使用了SpringMVC框架来搭建你的后端服务，并且你已经实现了UserService中的updateUser方法用于更新用户信息。在上面的代码中，我们使用了@RequestParam注解来获取前端发送过来的newDorm参数，然后更新用户信息并返回一个Result对象，表示更新是否成功。在前端，我们使用了jQuery来发送Ajax请求，并且使用了layer插件来显示提示信息。

Java宿舍管理系统hsqldb:1.宿舍楼的增删改查和浏览;2.宿舍的增删改查和浏览;3.学生入学宿舍入住和退住;4.学生调换宿舍;5.根据学生信息查询这些功能的代码实现

好的，这是一个比较复杂的问题。我会尽可能地简洁明了地回答你。

我们可以使用Java来开发宿舍管理系统，同时使用hsqldb作为数据库。下面是实现这些功能的代码示例：

1. 宿舍楼的增删改查和浏览

添加宿舍楼：

public void addBuilding(Building building) {
    String sql = "INSERT INTO building (building_name, building_address) VALUES (?, ?)";
    try (Connection conn = getConnection();
         PreparedStatement pstmt = conn.prepareStatement(sql)) {
        pstmt.setString(1, building.getName());
        pstmt.setString(2, building.getAddress());
        pstmt.executeUpdate();
    } catch (SQLException e) {
        e.printStackTrace();
    }
}

删除宿舍楼：

public void deleteBuilding(int id) {
    String sql = "DELETE FROM building WHERE building_id=?";
    try (Connection conn = getConnection();
         PreparedStatement pstmt = conn.prepareStatement(sql)) {
        pstmt.setInt(1, id);
        pstmt.executeUpdate();
    } catch (SQLException e) {
        e.printStackTrace();
    }
}

更新宿舍楼：

public void updateBuilding(Building building) {
    String sql = "UPDATE building SET building_name=?, building_address=? WHERE building_id=?";
    try (Connection conn = getConnection();
         PreparedStatement pstmt = conn.prepareStatement(sql)) {
        pstmt.setString(1, building.getName());
        pstmt.setString(2, building.getAddress());
        pstmt.setInt(3, building.getId());
        pstmt.executeUpdate();
    } catch (SQLException e) {
        e.printStackTrace();
    }
}

查询宿舍楼：

public List<Building> getBuildings() {
    List<Building> buildings = new ArrayList<>();
    String sql = "SELECT * FROM building";
    try (Connection conn = getConnection();
         Statement stmt = conn.createStatement();
         ResultSet rs = stmt.executeQuery(sql)) {
        while (rs.next()) {
            Building building = new Building();
            building.setId(rs.getInt("building_id"));
            building.setName(rs.getString("building_name"));
            building.setAddress(rs.getString("building_address"));
            buildings.add(building);
        }
    } catch (SQLException e) {
        e.printStackTrace();
    }
    return buildings;
}

2. 宿舍的增删改查和浏览

添加宿舍：

public void addDormitory(Dormitory dormitory) {
    String sql = "INSERT INTO dormitory (building_id, dormitory_name, capacity) VALUES (?, ?, ?)";
    try (Connection conn = getConnection();
         PreparedStatement pstmt = conn.prepareStatement(sql)) {
        pstmt.setInt(1, dormitory.getBuildingId());
        pstmt.setString(2, dormitory.getName());
        pstmt.setInt(3, dormitory.getCapacity());
        pstmt.executeUpdate();
    } catch (SQLException e) {
        e.printStackTrace();
    }
}

删除宿舍：

public void deleteDormitory(int id) {
    String sql = "DELETE FROM dormitory WHERE dormitory_id=?";
    try (Connection conn = getConnection();
         PreparedStatement pstmt = conn.prepareStatement(sql)) {
        pstmt.setInt(1, id);
        pstmt.executeUpdate();
    } catch (SQLException e) {
        e.printStackTrace();
    }
}

更新宿舍：

public void updateDormitory(Dormitory dormitory) {
    String sql = "UPDATE dormitory SET building_id=?, dormitory_name=?, capacity=? WHERE dormitory_id=?";
    try (Connection conn = getConnection();
         PreparedStatement pstmt = conn.prepareStatement(sql)) {
        pstmt.setInt(1, dormitory.getBuildingId());
        pstmt.setString(2, dormitory.getName());
        pstmt.setInt(3, dormitory.getCapacity());
        pstmt.setInt(4, dormitory.getId());
        pstmt.executeUpdate();
    } catch (SQLException e) {
        e.printStackTrace();
    }
}

查询宿舍：

public List<Dormitory> getDormitories() {
    List<Dormitory> dormitories = new ArrayList<>();
    String sql = "SELECT * FROM dormitory";
    try (Connection conn = getConnection();
         Statement stmt = conn.createStatement();
         ResultSet rs = stmt.executeQuery(sql)) {
        while (rs.next()) {
            Dormitory dormitory = new Dormitory();
            dormitory.setId(rs.getInt("dormitory_id"));
            dormitory.setBuildingId(rs.getInt("building_id"));
            dormitory.setName(rs.getString("dormitory_name"));
            dormitory.setCapacity(rs.getInt("capacity"));
            dormitories.add(dormitory);
        }
    } catch (SQLException e) {
        e.printStackTrace();
    }
    return dormitories;
}

3. 学生入学宿舍入住和退住

添加学生入住记录：

public void addCheckInRecord(CheckInRecord checkInRecord) {
    String sql = "INSERT INTO check_in_record (student_id, dormitory_id, check_in_time) VALUES (?, ?, ?)";
    try (Connection conn = getConnection();
         PreparedStatement pstmt = conn.prepareStatement(sql)) {
        pstmt.setInt(1, checkInRecord.getStudentId());
        pstmt.setInt(2, checkInRecord.getDormitoryId());
        pstmt.setTimestamp(3, new Timestamp(checkInRecord.getCheckInTime().getTime()));
        pstmt.executeUpdate();
    } catch (SQLException e) {
        e.printStackTrace();
    }
}

添加学生退住记录：

public void addCheckOutRecord(CheckOutRecord checkOutRecord) {
    String sql = "INSERT INTO check_out_record (student_id, dormitory_id, check_out_time) VALUES (?, ?, ?)";
    try (Connection conn = getConnection();
         PreparedStatement pstmt = conn.prepareStatement(sql)) {
        pstmt.setInt(1, checkOutRecord.getStudentId());
        pstmt.setInt(2, checkOutRecord.getDormitoryId());
        pstmt.setTimestamp(3, new Timestamp(checkOutRecord.getCheckOutTime().getTime()));
        pstmt.executeUpdate();
    } catch (SQLException e) {
        e.printStackTrace();
    }
}

4. 学生调换宿舍

更新学生入住记录：

public void updateCheckInRecord(CheckInRecord checkInRecord) {
    String sql = "UPDATE check_in_record SET dormitory_id=?, check_in_time=? WHERE student_id=?";
    try (Connection conn = getConnection();
         PreparedStatement pstmt = conn.prepareStatement(sql)) {
        pstmt.setInt(1, checkInRecord.getDormitoryId());
        pstmt.setTimestamp(2, new Timestamp(checkInRecord.getCheckInTime().getTime()));
        pstmt.setInt(3, checkInRecord.getStudentId());
        pstmt.executeUpdate();
    } catch (SQLException e) {
        e.printStackTrace();
    }
}

5. 根据学生信息查询

根据学生ID查询学生入住记录：

public List<CheckInRecord> getCheckInRecordsByStudentId(int studentId) {
    List<CheckInRecord> checkInRecords = new ArrayList<>();
    String sql = "SELECT * FROM check_in_record WHERE student_id=?";
    try (Connection conn = getConnection();
         PreparedStatement pstmt = conn.prepareStatement(sql)) {
        pstmt.setInt(1, studentId);
        try (ResultSet rs = pstmt.executeQuery()) {
            while (rs.next()) {
                CheckInRecord checkInRecord = new CheckInRecord();
                checkInRecord.setStudentId(rs.getInt("student_id"));
                checkInRecord.setDormitoryId(rs.getInt("dormitory_id"));
                checkInRecord.setCheckInTime(rs.getTimestamp("check_in_time"));
                checkInRecords.add(checkInRecord);
            }
        }
    } catch (SQLException e) {
        e.printStackTrace();
    }
    return checkInRecords;
}

根据学生ID查询学生退住记录：

public List<CheckOutRecord> getCheckOutRecordsByStudentId(int studentId) {
    List<CheckOutRecord> checkOutRecords = new ArrayList<>();
    String sql = "SELECT * FROM check_out_record WHERE student_id=?";
    try (Connection conn = getConnection();
         PreparedStatement pstmt = conn.prepareStatement(sql)) {
        pstmt.setInt(1, studentId);
        try (ResultSet rs = pstmt.executeQuery()) {
            while (rs.next()) {
                CheckOutRecord checkOutRecord = new CheckOutRecord();
                checkOutRecord.setStudentId(rs.getInt("student_id"));
                checkOutRecord.setDormitoryId(rs.getInt("dormitory_id"));
                checkOutRecord.setCheckOutTime(rs.getTimestamp("check_out_time"));
                checkOutRecords.add(checkOutRecord);
            }
        }
    } catch (SQLException e) {
        e.printStackTrace();
    }
    return checkOutRecords;
}

以上就是一个简单的宿舍管理系统的实现，代码示例仅供参考。如果你需要更详细的代码实现，可以参考一些开源的宿舍管理系统，如Dormitory Management System。