/**
* 获取分页参数
*
* @param params RowBounds参数
* @return 返回Page对象
*/
public Page getPage(Object params) {
Page page = getLocalPage();
if (page == null) {
if (params instanceof RowBounds) {
RowBounds rowBounds = (RowBounds) params;
if (offsetAsPageNum) {
page = new Page(rowBounds.getOffset(), rowBounds.getLimit(), rowBoundsWithCount);
} else {
page = new Page(rowBounds, rowBoundsWithCount);
// offsetAsPageNum=false的时候，由于PageNum问题，不能使用reasonable，这里会强制为false
page.setReasonable(false);
}
} else {
page = getPageFromObject(params);
}
setLocalPage(page);
}
// 分页合理化
if (page.getReasonable() == null) {
page.setReasonable(reasonable);
}
// 当设置为true的时候，如果pagesize设置为0（或RowBounds的limit=0），就不执行分页，返回全部结果
if (page.getPageSizeZero() == null) {
page.setPageSizeZero(pageSizeZero);
}
return page;
}
/**
* 对象中获取分页参数
*
* @param params
* @return
*/
public static Page getPageFromObject(Object params) {
int pageNum;
int pageSize;
MetaObject paramsObject = null;
if (params == null) {
throw new NullPointerException("分页查询参数params不能为空!");
}
if (hasRequest && requestClass.isAssignableFrom(params.getClass())) {
try {
paramsObject = SystemMetaObject.forObject(getParameterMap.invoke(params, new Object[] {}));
} catch (Exception e) {
// 忽略
}
} else {
paramsObject = SystemMetaObject.forObject(params);
}
if (paramsObject == null) {
throw new NullPointerException("分页查询参数params处理失败!");
}
try {
pageNum = Integer.parseInt(String.valueOf(getParamValue(paramsObject, "pageNum", true)));
pageSize = Integer.parseInt(String.valueOf(getParamValue(paramsObject, "pageSize", true)));
} catch (NumberFormatException e) {
throw new IllegalArgumentException("分页参数不是合法的数字类型!");
}
Object _count = getParamValue(paramsObject, "count", false);
boolean count = true;
if (_count != null) {
count = Boolean.valueOf(String.valueOf(_count));
}
Page page = new Page(pageNum, pageSize, count);
Object reasonable = getParamValue(paramsObject, "reasonable", false);
if (reasonable != null) {
page.setReasonable(Boolean.valueOf(String.valueOf(reasonable)));
}
Object pageSizeZero = getParamValue(paramsObject, "pageSizeZero", false);
if (pageSizeZero != null) {
page.setPageSizeZero(Boolean.valueOf(String.valueOf(pageSizeZero)));
}
return page;
}