static {
try {
requestClass = Class.forName("javax.servlet.ServletRequest");
getParameterMap = requestClass.getMethod("getParameterMap", new Class[] {});
hasRequest = true;
} catch (Exception e) {
hasRequest = false;
}
}
/**
* 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;
}