간단한 bean에서 json의 클래스로 변환-hibernate에 의존
public class SimpleJson {
private static final Logger logger = LoggerFactory
.getLogger(SimpleJson.class);
private static final Map<String, Map<String, Getter>> CLASS_MAP = new HashMap<String, Map<String, Getter>>();
public static final SimpleDateFormat SDF = new SimpleDateFormat(
"yyyy-MM-dd HH:mm:ss");
private SimpleJson() {}
public static Map<String, Getter> describe(Class<?> beanClass) {
String className = beanClass.getName();
Map<String, Getter> map = CLASS_MAP.get(className);
map = map == null ? new HashMap<String, Getter>() : map;
if (map.isEmpty()) {
Class<?> clazz = beanClass;
while (clazz != null && !clazz.getClass().equals(Object.class)) {
for (Field field : clazz.getDeclaredFields()) {
int mod = field.getModifiers();
if (Modifier.isStatic(mod) || Modifier.isFinal(mod)
|| Modifier.isNative(mod) || Modifier.isStrict(mod)
|| Modifier.isSynchronized(mod)
|| Modifier.isTransient(mod)) {
continue;
}
try {
Getter getter = ReflectHelper
.getGetter(beanClass, field.getName());
map.put(field.getName(), getter);
} catch (Exception e) {}
}
clazz = clazz.getSuperclass();
}
CLASS_MAP.put(className, map);
}
return map;
}
public static Object getValue(String fieldName, Object bean) {
Map<String, Getter> gettes = describe(bean.getClass());
Getter get = gettes.get(fieldName);
return get == null ? null : get.get(bean);
}
public static String toJSONString(Object value) {
StringBuilder sb = new StringBuilder(1024);
HashMap<Object, Boolean> cache = new HashMap<Object, Boolean>();
toJSONString(value, sb, cache);
String string = sb.toString();
sb = null;
cache.clear();
cache = null;
return string;
}
private static void toJSONString(Object value, StringBuilder sb,
Map<Object, Boolean> cache) {
if (value == null) {
sb.append("null");
} else if (value instanceof Map) {
toJSONString((Map) value, sb, cache);
} else if (value instanceof List) {
toJSONString((List) value, sb, cache);
} else if (value instanceof String) {
sb.append("\"");
escape((String) value, sb);
sb.append("\"");
} else if (value instanceof Character) {
sb.append("\"");
escape(value == null ? "" : value.toString(), sb);
sb.append("\"");
} else if (value instanceof Double) {
Double d = (Double) value;
sb.append((d.isInfinite() || d.isNaN()) ? "null" : d.toString());
} else if (value instanceof Float) {
Float f = (Float) value;
sb.append((f.isInfinite() || f.isNaN()) ? "null" : f.toString());
} else if (value instanceof Number) {
sb.append(value.toString());
} else if (value instanceof Boolean) {
sb.append(value.toString());
} else if (value instanceof Date) {
sb.append("\"").append(SDF.format((Date) value)).append("\"");
} else if (value.getClass().isEnum()) {
sb.append("\"").append(((Enum) value).toString()).append("\"");
} else {
Map<String, Getter> getters = describe(value.getClass());
if (cache.get(value) != null) {
Getter get = getters.get("id");
if (get != null) {
Object v = get.get(value);
sb.append("{");
toJSONString("id", v, sb, cache);
sb.append("}");
}
return;
} else {
cache.put(value, Boolean.TRUE);
}
boolean first = true;
Iterator<Entry<String, Getter>> iter = getters.entrySet()
.iterator();
sb.append('{');
while (iter.hasNext()) {
Entry<String, Getter> entry = iter.next();
String key = entry.getKey();
Object v = entry.getValue().get(value);
if (key == null || v == null) {
continue;
}
if (first) {
first = false;
} else {
sb.append(',');
}
toJSONString(entry.getKey(), v, sb, cache);
}
sb.append('}');
}
}
private static void toJSONString(Map map, StringBuilder sb,
Map<Object, Boolean> cache) {
if (map == null) {
sb.append("null");
}
boolean first = true;
Iterator iter = map.entrySet().iterator();
sb.append('{');
while (iter.hasNext()) {
Map.Entry entry = (Map.Entry) iter.next();
Object key = entry.getKey();
Object v = entry.getValue();
if (key == null || v == null) {
continue;
}
if (first) {
first = false;
} else {
sb.append(',');
}
toJSONString(String.valueOf(key), v, sb, cache);
}
sb.append('}');
}
private static void toJSONString(List list, StringBuilder sb,
Map<Object, Boolean> cache) {
if (list == null) {
sb.append("null");
}
boolean first = true;
Iterator iter = list.iterator();
sb.append('[');
while (iter.hasNext()) {
if (first) {
first = false;
} else {
sb.append(',');
}
Object value = iter.next();
if (value == null) {
sb.append("null");
continue;
}
toJSONString(value, sb, cache);
}
sb.append(']');
}
private static void toJSONString(String key, Object value,
StringBuilder sb, Map<Object, Boolean> cache) {
sb.append('\"');
if (key == null) {
sb.append("null");
} else {
escape(key, sb);
}
sb.append('\"').append(':');
toJSONString(value, sb, cache);
}
private static void escape(String s, StringBuilder sb) {
for (int i = 0; i < s.length(); i++) {
char ch = s.charAt(i);
switch (ch) {
case '"':
sb.append("\\\"");
break;
case '\\':
sb.append("\\\\");
break;
case '\b':
sb.append("\\b");
break;
case '\f':
sb.append("\\f");
break;
case '
':
sb.append("\
");
break;
case '\r':
sb.append("\\r");
break;
case '\t':
sb.append("\\t");
break;
case '/':
sb.append("\\/");
break;
default:
//Reference: http://www.unicode.org/versions/Unicode5.1.0/
if ((ch >= '\u0000' && ch <= '\u001F')
|| (ch >= '\u007F' && ch <= '\u009F')
|| (ch >= '\u2000' && ch <= '\u20FF')) {
String ss = Integer.toHexString(ch);
sb.append("\\u");
for (int k = 0; k < 4 - ss.length(); k++) {
sb.append('0');
}
sb.append(ss.toUpperCase());
} else {
sb.append(ch);
}
}
}//for
}
}
No Hibernate
import java.beans.Introspector;
import java.lang.reflect.Field;
import java.lang.reflect.Member;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
public class SimpleJson {
private static final Map<String, Map<String, Getter>> CLASS_MAP = new HashMap<String, Map<String, Getter>>();
public static final SimpleDateFormat SDF = new SimpleDateFormat(
"yyyy-MM-dd HH:mm:ss");
private SimpleJson() {
}
public static Map<String, Getter> describe(Class<?> beanClass) {
String className = beanClass.getName();
Map<String, Getter> map = CLASS_MAP.get(className);
map = map == null ? new HashMap<String, Getter>() : map;
if (map.isEmpty()) {
Class<?> clazz = beanClass;
while (clazz != null && !clazz.getClass().equals(Object.class)) {
for (Field field : clazz.getDeclaredFields()) {
int mod = field.getModifiers();
if (Modifier.isStatic(mod) || Modifier.isFinal(mod)
|| Modifier.isNative(mod) || Modifier.isStrict(mod)
|| Modifier.isSynchronized(mod)
|| Modifier.isTransient(mod)) {
continue;
}
try {
Getter getter = Getter.getGetterOrNull(beanClass, field
.getName());
map.put(field.getName(), getter);
} catch (Exception e) {
}
}
clazz = clazz.getSuperclass();
}
CLASS_MAP.put(className, map);
}
return map;
}
public static Object getValue(String fieldName, Object bean) {
Map<String, Getter> gettes = describe(bean.getClass());
Getter get = gettes.get(fieldName);
return get == null ? null : get.get(bean);
}
public static String toJSONString(Object value) {
StringBuilder sb = new StringBuilder(1024);
HashMap<Object, Boolean> cache = new HashMap<Object, Boolean>();
toJSONString(value, sb, cache);
String string = sb.toString();
sb = null;
cache.clear();
cache = null;
return string;
}
private static void toJSONString(Object value, StringBuilder sb,
Map<Object, Boolean> cache) {
if (value == null) {
sb.append("null");
} else if (value instanceof Map) {
toJSONString((Map) value, sb, cache);
} else if (value instanceof List) {
toJSONString((List) value, sb, cache);
} else if (value instanceof String) {
sb.append("\"");
escape((String) value, sb);
sb.append("\"");
} else if (value instanceof Character) {
sb.append("\"");
escape(value == null ? "" : value.toString(), sb);
sb.append("\"");
} else if (value instanceof Double) {
Double d = (Double) value;
sb.append((d.isInfinite() || d.isNaN()) ? "null" : d.toString());
} else if (value instanceof Float) {
Float f = (Float) value;
sb.append((f.isInfinite() || f.isNaN()) ? "null" : f.toString());
} else if (value instanceof Number) {
sb.append(value.toString());
} else if (value instanceof Boolean) {
sb.append(value.toString());
} else if (value instanceof Date) {
sb.append("\"").append(SDF.format((Date) value)).append("\"");
} else if (value.getClass().isEnum()) {
sb.append("\"").append(((Enum) value).toString()).append("\"");
} else {
Map<String, Getter> getters = describe(value.getClass());
if (cache.get(value) != null) {
Getter get = getters.get("id");
if (get != null) {
Object v = get.get(value);
sb.append("{");
toJSONString("id", v, sb, cache);
sb.append("}");
}
return;
} else {
cache.put(value, Boolean.TRUE);
}
boolean first = true;
Iterator<Entry<String, Getter>> iter = getters.entrySet()
.iterator();
sb.append('{');
while (iter.hasNext()) {
Entry<String, Getter> entry = iter.next();
String key = entry.getKey();
Object v = entry.getValue().get(value);
if (key == null || v == null) {
continue;
}
if (first) {
first = false;
} else {
sb.append(',');
}
toJSONString(entry.getKey(), v, sb, cache);
}
sb.append('}');
}
}
private static void toJSONString(Map map, StringBuilder sb,
Map<Object, Boolean> cache) {
if (map == null) {
sb.append("null");
}
boolean first = true;
Iterator iter = map.entrySet().iterator();
sb.append('{');
while (iter.hasNext()) {
Map.Entry entry = (Map.Entry) iter.next();
Object key = entry.getKey();
Object v = entry.getValue();
if (key == null || v == null) {
continue;
}
if (first) {
first = false;
} else {
sb.append(',');
}
toJSONString(String.valueOf(key), v, sb, cache);
}
sb.append('}');
}
private static void toJSONString(List list, StringBuilder sb,
Map<Object, Boolean> cache) {
if (list == null) {
sb.append("null");
}
boolean first = true;
Iterator iter = list.iterator();
sb.append('[');
while (iter.hasNext()) {
if (first) {
first = false;
} else {
sb.append(',');
}
Object value = iter.next();
if (value == null) {
sb.append("null");
continue;
}
toJSONString(value, sb, cache);
}
sb.append(']');
}
private static void toJSONString(String key, Object value,
StringBuilder sb, Map<Object, Boolean> cache) {
sb.append('\"');
if (key == null) {
sb.append("null");
} else {
escape(key, sb);
}
sb.append('\"').append(':');
toJSONString(value, sb, cache);
}
private static void escape(String s, StringBuilder sb) {
for (int i = 0; i < s.length(); i++) {
char ch = s.charAt(i);
switch (ch) {
case '"':
sb.append("\\\"");
break;
case '\\':
sb.append("\\\\");
break;
case '\b':
sb.append("\\b");
break;
case '\f':
sb.append("\\f");
break;
case '
':
sb.append("\
");
break;
case '\r':
sb.append("\\r");
break;
case '\t':
sb.append("\\t");
break;
case '/':
sb.append("\\/");
break;
default:
//Reference: http://www.unicode.org/versions/Unicode5.1.0/
if ((ch >= '\u0000' && ch <= '\u001F')
|| (ch >= '\u007F' && ch <= '\u009F')
|| (ch >= '\u2000' && ch <= '\u20FF')) {
String ss = Integer.toHexString(ch);
sb.append("\\u");
for (int k = 0; k < 4 - ss.length(); k++) {
sb.append('0');
}
sb.append(ss.toUpperCase());
} else {
sb.append(ch);
}
}
}//for
}
public static final class Getter {
private Class<?> clazz;
private final transient Method method;
private final String propertyName;
private Getter(Class<?> clazz, Method method, String propertyName) {
this.clazz = clazz;
this.method = method;
this.propertyName = propertyName;
}
public static boolean isPublic(Class<?> clazz, Member member) {
return ((Modifier.isPublic(member.getModifiers())) && (Modifier
.isPublic(clazz.getModifiers())));
}
public static Getter getGetterOrNull(Class<?> theClass,
String propertyName) {
if ((theClass == Object.class) || (theClass == null)) {
return null;
}
Method method = getterMethod(theClass, propertyName);
if (method != null) {
if (isPublic(theClass, method))
method.setAccessible(true);
return new Getter(theClass, method, propertyName);
}
Getter getter = getGetterOrNull(theClass.getSuperclass(),
propertyName);
if (getter == null) {
Class[] interfaces = theClass.getInterfaces();
for (int i = 0; (getter == null) && (i < interfaces.length); ++i) {
getter = getGetterOrNull(interfaces[i], propertyName);
}
}
return getter;
}
private static Method getterMethod(Class theClass, String propertyName) {
Method[] methods = theClass.getDeclaredMethods();
for (int i = 0; i < methods.length; ++i) {
if (methods[i].getParameterTypes().length == 0) {
String methodName = methods[i].getName();
if (methodName.startsWith("get")) {
String testStdMethod = Introspector
.decapitalize(methodName.substring(3));
String testOldMethod = methodName.substring(3);
if ((testStdMethod.equals(propertyName))
|| (testOldMethod.equals(propertyName))) {
return methods[i];
}
}
if (methodName.startsWith("is")) {
String testStdMethod = Introspector
.decapitalize(methodName.substring(2));
String testOldMethod = methodName.substring(2);
if ((testStdMethod.equals(propertyName))
|| (testOldMethod.equals(propertyName))) {
return methods[i];
}
}
}
}
return null;
}
public Object get(Object target) {
try {
return this.method.invoke(target, null);
} catch (Exception e) {
throw new RuntimeException(e);
}
}
public Object getForInsert(Object target, Map<?, ?> mergeMap) {
return get(target);
}
public Class<?> getReturnType() {
return this.method.getReturnType();
}
public Member getMember() {
return this.method;
}
public Method getMethod() {
return this.method;
}
public String getMethodName() {
return this.method.getName();
}
public String toString() {
return "Getter(" + this.clazz.getName() + '.' + this.propertyName
+ ')';
}
}
public static void main(String[] args) {
List<Object> list = new ArrayList<Object>();
for (int i = 0; i < 3; i++) {
Object o = new Object() {
private String a = Math.random()+"aaa";
private String b = Math.random()+"bbb";
public String getA() {
return a;
}
public void setA(String a) {
this.a = a;
}
public String getB() {
return b;
}
public void setB(String b) {
this.b = b;
}
};
list.add(o);
}
System.out.println(SimpleJson.toJSONString(list));
}
}
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