ListコレクションはObjectのあるフィールドに従って並べ替えられ、親フィールドが取れない問題を解決する
17027 ワード
， ， ！ ， ， ， 。
List ， List
public class SortListUtil {
public static final String DESC = "desc";
public static final String ASC = "asc";
/**
* list .
*
* @param list
*
* @param field
*
* @return
*/
public static List> sort(List> list, final String field) {
return sort(list, field, null);
}
/**
* list .
*
* @param list
*
* @param field
*
* @param sort
* : SortList.DESC( ) SortList.ASC( ).
* @return
*/
@SuppressWarnings("unchecked")
public static List> sort(List> list, final String field,
final String sort) {
Collections.sort(list, new Comparator() {
public int compare(Object a, Object b) {
int ret = 0;
try {
Field f = null;
//a.getClass().getDeclaredField(field); ，
//
Class> clazz = a.getClass() ;
for(; clazz != Object.class ; clazz = clazz.getSuperclass()) {
try {
f = clazz.getDeclaredField(field) ;
break;
} catch (Exception e) {
// ！ ， 。
// ， clazz = clazz.getSuperclass(),
}
}
//Field f = a.getClass().getDeclaredField(field);
f.setAccessible(true);
Class> type = f.getType();
if (type == int.class) {
ret = ((Integer) f.getInt(a)).compareTo((Integer) f
.getInt(b));
} else if (type == double.class) {
ret = ((Double) f.getDouble(a)).compareTo((Double) f
.getDouble(b));
} else if (type == long.class) {
ret = ((Long) f.getLong(a)).compareTo((Long) f
.getLong(b));
} else if (type == float.class) {
ret = ((Float) f.getFloat(a)).compareTo((Float) f
.getFloat(b));
} else if (type == Date.class) {
ret = ((Date) f.get(a)).compareTo((Date) f.get(b));
} else if (isImplementsOf(type, Comparable.class)) {
ret = ((Comparable) f.get(a)).compareTo((Comparable) f
.get(b));
} else {
ret = String.valueOf(f.get(a)).compareTo(
String.valueOf(f.get(b)));
}
}catch (Exception e) {
e.printStackTrace();
}
if (sort != null && sort.toLowerCase().equals(DESC)) {
return -ret;
} else {
return ret;
}
}
});
return list;
}
/**
* list .
*
* @param list
*
* @param field
*
* @param sort
* : SortList.DESC( ) SortList.ASC( ).
* @return
*/
@SuppressWarnings("unchecked")
public static List> sortMapList(List> list, final String field,
final String sort) {
Collections.sort(list, new Comparator() {
public int compare(Object a, Object b) {
int ret = 0;
try {
Map tempA = (Map)a;
Map tempB = (Map)b;
Object fA = tempA.get(field);
Object fB = tempB.get(field);
if(fA instanceof String){
fA = Double.parseDouble((String)fA);
}
if(fB instanceof String){
fB = Double.parseDouble((String)fB);
}
ret = ((Double)fA).compareTo((Double)fB);
}catch (Exception e) {
e.printStackTrace();
}
if (sort != null && sort.toLowerCase().equals(DESC)) {
return -ret;
} else {
return ret;
}
}
});
return list;
}
/**
* list fields sorts ,
* fields[i] ,sorts[i] . sorts[i] .
*
* @param list
* @param fields
* @param sorts
* @return
*/
@SuppressWarnings("unchecked")
public static List> sort(List> list, String[] fields, String[] sorts) {
if (fields != null && fields.length > 0) {
for (int i = fields.length - 1; i >= 0; i--) {
final String field = fields[i];
String tmpSort = ASC;
if (sorts != null && sorts.length > i && sorts[i] != null) {
tmpSort = sorts[i];
}
final String sort = tmpSort;
Collections.sort(list, new Comparator() {
public int compare(Object a, Object b) {
int ret = 0;
try {
Field f = a.getClass().getDeclaredField(field);
f.setAccessible(true);
Class> type = f.getType();
if (type == int.class) {
ret = ((Integer) f.getInt(a))
.compareTo((Integer) f.getInt(b));
} else if (type == double.class) {
ret = ((Double) f.getDouble(a))
.compareTo((Double) f.getDouble(b));
} else if (type == long.class) {
ret = ((Long) f.getLong(a)).compareTo((Long) f
.getLong(b));
} else if (type == float.class) {
ret = ((Float) f.getFloat(a))
.compareTo((Float) f.getFloat(b));
} else if (type == Date.class) {
ret = ((Date) f.get(a)).compareTo((Date) f
.get(b));
} else if (isImplementsOf(type, Comparable.class)) {
ret = ((Comparable) f.get(a))
.compareTo((Comparable) f.get(b));
} else {
ret = String.valueOf(f.get(a)).compareTo(
String.valueOf(f.get(b)));
}
} catch (SecurityException e) {
e.printStackTrace();
} catch (NoSuchFieldException e) {
e.printStackTrace();
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
}
if (sort != null && sort.toLowerCase().equals(DESC)) {
return -ret;
} else {
return ret;
}
}
});
}
}
return list;
}
/**
*
*
* @param list
* @param method
* @return
*/
public static List> sortByMethod(List> list, final String method) {
return sortByMethod(list, method, null);
}
@SuppressWarnings("unchecked")
public static List> sortByMethod(List> list, final String method,
final String sort) {
Collections.sort(list, new Comparator() {
public int compare(Object a, Object b) {
int ret = 0;
try {
Method m = a.getClass().getMethod(method, null);
m.setAccessible(true);
Class> type = m.getReturnType();
if (type == int.class) {
ret = ((Integer) m.invoke(a, null))
.compareTo((Integer) m.invoke(b, null));
} else if (type == double.class) {
ret = ((Double) m.invoke(a, null)).compareTo((Double) m
.invoke(b, null));
} else if (type == long.class) {
ret = ((Long) m.invoke(a, null)).compareTo((Long) m
.invoke(b, null));
} else if (type == float.class) {
ret = ((Float) m.invoke(a, null)).compareTo((Float) m
.invoke(b, null));
} else if (type == Date.class) {
ret = ((Date) m.invoke(a, null)).compareTo((Date) m
.invoke(b, null));
} else if (isImplementsOf(type, Comparable.class)) {
ret = ((Comparable) m.invoke(a, null))
.compareTo((Comparable) m.invoke(b, null));
} else {
ret = String.valueOf(m.invoke(a, null)).compareTo(
String.valueOf(m.invoke(b, null)));
}
if (isImplementsOf(type, Comparable.class)) {
ret = ((Comparable) m.invoke(a, null))
.compareTo((Comparable) m.invoke(b, null));
} else {
ret = String.valueOf(m.invoke(a, null)).compareTo(
String.valueOf(m.invoke(b, null)));
}
}catch (Exception it) {
System.out.println(it);
}
if (sort != null && sort.toLowerCase().equals(DESC)) {
return -ret;
} else {
return ret;
}
}
});
return list;
}
@SuppressWarnings("unchecked")
public static List> sortByMethod(List> list, final String methods[],
final String sorts[]) {
if (methods != null && methods.length > 0) {
for (int i = methods.length - 1; i >= 0; i--) {
final String method = methods[i];
String tmpSort = ASC;
if (sorts != null && sorts.length > i && sorts[i] != null) {
tmpSort = sorts[i];
}
final String sort = tmpSort;
Collections.sort(list, new Comparator() {
public int compare(Object a, Object b) {
int ret = 0;
try {
Method m = a.getClass().getMethod(method, null);
m.setAccessible(true);
Class> type = m.getReturnType();
if (type == int.class) {
ret = ((Integer) m.invoke(a, null))
.compareTo((Integer) m.invoke(b, null));
} else if (type == double.class) {
ret = ((Double) m.invoke(a, null))
.compareTo((Double) m.invoke(b, null));
} else if (type == long.class) {
ret = ((Long) m.invoke(a, null))
.compareTo((Long) m.invoke(b, null));
} else if (type == float.class) {
ret = ((Float) m.invoke(a, null))
.compareTo((Float) m.invoke(b, null));
} else if (type == Date.class) {
ret = ((Date) m.invoke(a, null))
.compareTo((Date) m.invoke(b, null));
} else if (isImplementsOf(type, Comparable.class)) {
ret = ((Comparable) m.invoke(a, null))
.compareTo((Comparable) m.invoke(b,
null));
} else {
ret = String.valueOf(m.invoke(a, null))
.compareTo(
String.valueOf(m
.invoke(b, null)));
}
} catch (NoSuchMethodException ne) {
System.out.println(ne);
} catch (IllegalAccessException ie) {
System.out.println(ie);
} catch (InvocationTargetException it) {
System.out.println(it);
}
if (sort != null && sort.toLowerCase().equals(DESC)) {
return -ret;
} else {
return ret;
}
}
});
}
}
return list;
}
/**
* szInterface
*
* @param clazz
* @param szInterface
* @return
*/
public static boolean isImplementsOf(Class> clazz, Class> szInterface) {
boolean flag = false;
Class>[] face = clazz.getInterfaces();
for (Class> c : face) {
if (c == szInterface) {
flag = true;
} else {
flag = isImplementsOf(c, szInterface);
}
}
if (!flag && null != clazz.getSuperclass()) {
return isImplementsOf(clazz.getSuperclass(), szInterface);
}
return flag;
}
// MAP
public static Map sortMapByValue(Map oriMap) {
Map sortedMap = new LinkedHashMap();
if (oriMap != null && !oriMap.isEmpty()) {
List> entryList = new ArrayList>(oriMap.entrySet());
Collections.sort(entryList,
new Comparator>() {
public int compare(Map.Entry entry1,
Map.Entry entry2) {
int value1 = 0, value2 = 0;
try {
value1 = getInt(entry1.getValue());
value2 = getInt(entry2.getValue());
} catch (NumberFormatException e) {
value1 = 0;
value2 = 0;
}
return value2 - value1;
}
});
Iterator> iter = entryList.iterator();
Map.Entry tmpEntry = null;
while (iter.hasNext()) {
tmpEntry = iter.next();
sortedMap.put(tmpEntry.getKey(), tmpEntry.getValue());
}
}
return sortedMap;
}
private static int getInt(Object str) {
int i = 0;
try {
Pattern p = Pattern.compile("^\\d+");
Matcher m = p.matcher(str.toString());
if (m.find()) {
i = Integer.valueOf(m.group());
}
} catch (NumberFormatException e) {
e.printStackTrace();
}
return i;
}
}