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java 分页查询实例_JAVA分页实例

JAVA

2023-03-02 11:48:21 时间

package cn.gov.songjiang.help.common;

/\*\*

\* This class is an util for split page in java web applications.

\* @author Johnson

\* @version 1.0

\*/

public class SplitPage

//Total record amount.

private int recordCount = 0;

//Record per page.

private int pageSize = 0;

//Start record number for current page.

private int startRecordNumber;

//Last record number for current page.

private int lastRecordNumber;

/\*\*

\* Constructor

\* @param recordCount Total record amount.

\* @param pageSize  Record per page.

\*/

public SplitPage(int recordCount,int pageSize)

this.recordCount = recordCount;

this.pageSize = pageSize;

startRecordNumber = 1;

lastRecordNumber = pageSize;

if(lastRecordNumber>recordCount)

lastRecordNumber = recordCount;

/\*\*

\* Set total record amount.

\* @param recordCount Total record amount

\*/

public void setRecordCount(int recordCount)

this.recordCount = recordCount;

/\*\*

\* Set record per page.

\* @param pageSize Record per page

\*/

public void setPageSize(int pageSize)

this.pageSize = pageSize;

/\*\*

\* Test if current page is the first page.

\* @return Return true if current page is the first page,false otherwise.

\*/

public boolean isFirstPage()

return (startRecordNumber==1)?true:false;

/\*\*

\* Test if current page is last page.

\* @return Return true if current page is the last page,false otherwise.

\*/

public boolean isLastPage()

return (lastRecordNumber==recordCount)?true:false;

/\*\*

\* Move to next page.

\* @exception IndexOutOfBoundsException If the current page is last page.

\*/

public void moveNext()

if(!this.isLastPage())

startRecordNumber += pageSize;

lastRecordNumber += pageSize;

if(lastRecordNumber>recordCount)

lastRecordNumber = recordCount;

else

throw new IndexOutOfBoundsException("Page index out of bounds!");

/\*\*

\* Move to previous page.

\* @exception IndexOutOfBoundsException If the current page is first page.

\*/

public void movePrevious()

if(!this.isFirstPage())

startRecordNumber -= pageSize;

lastRecordNumber -= pageSize;

if(lastRecordNumber>recordCount)

lastRecordNumber = recordCount;

else

throw new IndexOutOfBoundsException("Page index out of bounds!");

/\*\*

\* Move to the first page.

\*/

public void moveFirst()

startRecordNumber = 1;

lastRecordNumber = pageSize;

if(lastRecordNumber>recordCount)

lastRecordNumber = recordCount;

/\*\*

\* Move to the last page.

\*/

public void moveLast()

int pageCount = recordCount / pageSize;

if(recordCount % pageSize != 0)

pageCount++;

startRecordNumber = (pageCount - 1) \* pageSize + 1;

lastRecordNumber = recordCount;

/\*\*

\* Move to specified page.

\* @param pageNo the page no which will be move to.

\* @exception IndexOutOfBoundsException if the page no is invalid.

\*/

public void move(int pageNo)

int pageCount = recordCount / pageSize;

if(recordCount % pageSize != 0)

pageCount++;

if(pageNo > pageCount || pageNo < 1)

throw new IndexOutOfBoundsException("Page index out of Bounds!");

startRecordNumber = (pageNo - 1) \* pageSize + 1;

lastRecordNumber = startRecordNumber + pageSize - 1;

if(lastRecordNumber>recordCount)

lastRecordNumber = recordCount;

/\*\*

\* Get the start record no of the current page.

\* @return the start record no for current page.

\*/

public int getStartRecordNumber()

return this.startRecordNumber;

/\*\*

\* Get the last record no of the current page.

\* @return the last record no for current page.

\*/

public int getLastRecordNumber()

return this.lastRecordNumber;

/\*\*

\* Get the page count.

\* @return the page count

\*/

public int getPageCount()

int pageCount = recordCount / pageSize;

if(recordCount % pageSize != 0)

pageCount++;

return pageCount;

/\*\*

\* Get the current page no.

\* @return the current page no.

\*/

public int getCurrentPageNo()

int currentPageNo = (startRecordNumber / pageSize) + 1;

return currentPageNo;

/\*\*

\* Get record amount per page.

\* @return the record amount per page.

\*/

public int getPageSize()

return this.pageSize;

/\*\*   \* Get record amount.   \*   \* @return   \*/  public int getRecordCount()  \{   return this.recordCount;  \} \}

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