常用工具类

package cn.vicky.utils;import java.lang.reflect.Constructor;import java.lang.reflect.InvocationTargetException;import java.util.*;public class PropertiesWrapper {public PropertiesWrapper(Properties properties) {if (properties == null) {throw new NullPointerException("The argument must not be null");} else {this.properties = properties;return;}}public Properties getProperties() {return properties;}/** * 获得key对应的value * @param name * @return */public String getProperty(String name) {return properties.getProperty(name);}/** * 获得key对应的value，如果没有，则返回默认值 * @param name * @param defaultValue * @return */public String getProperty(String name, String defaultValue) {return properties.getProperty(name, defaultValue);}/** * 获得key对应的value，如果没有，则返回默认值，返回Boolean类型 * @param name * @param defaultValue * @return */public boolean getBooleanProperty(String name, boolean defaultValue) {String value = properties.getProperty(name);return value != null ? Boolean.valueOf(value).booleanValue() : defaultValue;}/** * 获得key对应的value，如果没有，则返回默认值，返回int类型 * @param name * @param defaultValue * @return */public int getIntProperty(String name, int defaultValue) {String value = properties.getProperty(name);if (value == null)return defaultValue;try {return Integer.parseInt(value);} catch (NumberFormatException e) {throw (NumberFormatException) (new NumberFormatException((new StringBuilder()).append("The value of the ").append(name).append(" property must be a valid ").append("int: /"").append(value).append("/"").toString())).initCause(e);}}/** * 获得key对应的value，返回int类型 * @param name * @return */public int getRequiredIntProperty(String name) {String value = properties.getProperty(name);if (value == null)throw new IllegalArgumentException((new StringBuilder()).append("The ").append(name).append(" property must be specified").toString());try {return Integer.parseInt(value);} catch (NumberFormatException e) {throw (NumberFormatException) (new NumberFormatException((new StringBuilder()).append("The value of the ").append(name).append(" property must be a valid ").append("int: /"").append(value).append("/"").toString())).initCause(e);}}/** * 获得key对应的value，如果没有，则返回默认值，返回int类型，并且设置返回值的最大范围与最小范围 * @param name * @param defaultValue * @param min * @param max * @return */public int getIntProperty(String name, int defaultValue, int min, int max) {if (min > max)throw new IllegalArgumentException("The min must not be greater than the max");if (min > defaultValue || defaultValue > max)throw new IllegalArgumentException("The default value must be between the min and the max");int result = getIntProperty(name, defaultValue);if (min > result)throw new IllegalArgumentException((new StringBuilder()).append("The value of the ").append(name).append(" property must not be less ").append("than ").append(min).append(": ").append(result).toString());if (result > max)throw new IllegalArgumentException((new StringBuilder()).append("The value of the ").append(name).append(" property must not be greater ").append("than ").append(max).append(": ").append(result).toString());elsereturn result;}/** * 获得key对应的value，返回int类型，并且设置返回值的最大范围与最小范围 * @param name * @param min * @param max * @return */public int getRequiredIntProperty(String name, int min, int max) {if (min > max)throw new IllegalArgumentException("The min must not be greater than the max");int result = getRequiredIntProperty(name);if (min > result)throw new IllegalArgumentException((new StringBuilder()).append("The value of the ").append(name).append(" property must not be less ").append("than ").append(min).append(": ").append(result).toString());if (result > max)throw new IllegalArgumentException((new StringBuilder()).append("The value of the ").append(name).append(" property must not be greater ").append("than ").append(max).append(": ").append(result).toString());elsereturn result;}/** * 获得key对应的value，返回Long类型 * @param name * @param defaultValue * @return */public long getLongProperty(String name, long defaultValue) {String value = properties.getProperty(name);if (value == null)return defaultValue;try {return Long.parseLong(value);} catch (NumberFormatException e) {throw (NumberFormatException) (new NumberFormatException((new StringBuilder()).append("The value of the ").append(name).append(" property must be a valid ").append("long: /"").append(value).append("/"").toString())).initCause(e);}}/** * 获得key对应的value，返回Long类型，并且设置返回值的最大范围与最小范围 * @param name * @param defaultValue * @param min * @param max * @return */public long getLongProperty(String name, long defaultValue, long min, long max) {if (min > max)throw new IllegalArgumentException("The min must not be greater than the max");if (min > defaultValue || defaultValue > max)throw new IllegalArgumentException("The default value must be between the min and the max");long result = getLongProperty(name, defaultValue);if (min > result)throw new IllegalArgumentException((new StringBuilder()).append("The value of the ").append(name).append(" property must not be less ").append("than ").append(min).append(": ").append(result).toString());if (result > max)throw new IllegalArgumentException((new StringBuilder()).append("The value of the ").append(name).append(" property must not be greater ").append("than ").append(max).append(": ").append(result).toString());elsereturn result;}/** * 根据类名，类型，构造参数类型，参数对象，构造对象 * @param name * @param type * @param paramTypes * @param args * @return */public Object getClassInstanceProperty(String name, Class type, Class paramTypes[],Object args[]) {String className = properties.getProperty(name);if (className == null)return null;elsereturn getClassInstance(name, className, type, paramTypes, args);}/** * 根据类名，默认类名，类型，构造参数类型，构造对象 * @param name * @param defaultClass * @param type * @param paramTypes * @param args * @return */public Object getClassInstanceProperty(String name, String defaultClass, Class type,Class paramTypes[], Object args[]) {Object instance = getClassInstanceProperty(name, type, paramTypes, args);if (instance != null)return instance;if (defaultClass == null)return null;elsereturn getClassInstance(name, defaultClass, type, paramTypes, args);}/** * 获得类的实例 * @param name * @param className * @param type * @param paramTypes * @param args * @return */private Object getClassInstance(String name, String className, Class type, Class paramTypes[],Object args[]) {if (className == null)throw new NullPointerException("null className");Throwable cause;try {return Class.forName(className).asSubclass(type).getConstructor(paramTypes).newInstance(args);} catch (ClassNotFoundException e) {throw new IllegalArgumentException((new StringBuilder()).append("The class ").append(className).append(getPropertyText(name)).append(" was not found").toString(), e);} catch (ClassCastException e) {throw new IllegalArgumentException((new StringBuilder()).append("The class ").append(className).append(getPropertyText(name)).append(" does not implement ").append(type.getName()).toString(), e);} catch (NoSuchMethodException e) {StringBuilder sb = new StringBuilder();boolean first = true;Class arr$[] = paramTypes;int len$ = arr$.length;for (int i$ = 0; i$ < len$; i$++) {Class paramType = arr$[i$];if (first)first = false;elsesb.append(", ");sb.append(paramType.getName());}throw new IllegalArgumentException((new StringBuilder()).append("The class ").append(className).append(getPropertyText(name)).append(" does not have a constructor with required parameters: ").append(sb).toString(),e);} catch (InvocationTargetException e) {cause = e.getCause();} catch (Exception e) {throw new IllegalArgumentException((new StringBuilder()).append("Creating an instance of the class ").append(className).append(getPropertyText(name)).append(" throws: ").append(e).toString(), e);}if (cause instanceof RuntimeException)throw (RuntimeException) cause;if (cause instanceof Error)throw (Error) cause;elsethrow new IllegalArgumentException((new StringBuilder()).append("Calling the constructor for the class ").append(className).append(getPropertyText(name)).append(" throws: ").append(cause).toString(), cause);}private String getPropertyText(String name) {return name == null ? "" : (new StringBuilder()).append(", specified by the property: ").append(name).append(",").toString();}public Enum getEnumProperty(String name, Class enumType, Enum defaultValue) {Objects.checkNull("name", name);Objects.checkNull("enumType", enumType);Objects.checkNull("defaultValue", defaultValue);String value = properties.getProperty(name);if (value == null)return defaultValue;try {return Enum.valueOf(enumType, value);} catch (IllegalArgumentException e) {throw new IllegalArgumentException((new StringBuilder()).append("The value of the ").append(name).append(" property was /"").append(value).append("/", but must be one of: ").append(Arrays.toString(enumType.getEnumConstants())).toString());}}public List getListProperty(String name, Class type, Object defaultElement) {Objects.checkNull("name", name);Objects.checkNull("type", type);List list = new ArrayList();String value = properties.getProperty(name);if (value == null)return list;String values[] = value.split(":", -1);Class constructorParams[] = { String.class };Constructor constructor = null;try {constructor = type.getConstructor(constructorParams);} catch (NoSuchMethodException nsme) {throw new IllegalArgumentException((new StringBuilder()).append("The class ").append(type.getName()).append(" does not have a ").append("constructor with the required parameter : String").toString(), nsme);}String arr$[] = values;int len$ = arr$.length;for (int i$ = 0; i$ < len$; i$++) {String v = arr$[i$];if (v.equals("")) {list.add(defaultElement);continue;}try {list.add(constructor.newInstance(new Object[] { v }));} catch (Exception e) {throw new IllegalArgumentException((new StringBuilder()).append("Creating an instance of the class ").append(type.getName()).append(" throws: ").append(e).toString(), e);}}return list;}public List getEnumListProperty(String name, Class enumType, Enum defaultElement) {Objects.checkNull("name", name);Objects.checkNull("enumType", enumType);List list = new ArrayList();String value = properties.getProperty(name);if (value == null)return list;String values[] = value.split(":", -1);String arr$[] = values;int len$ = arr$.length;for (int i$ = 0; i$ < len$; i$++) {String v = arr$[i$];if (v.equals("")) {list.add(defaultElement);continue;}try {list.add(Enum.valueOf(enumType, v));} catch (IllegalArgumentException e) {throw new IllegalArgumentException((new StringBuilder()).append("A value in the list of items in the ").append(name).append(" property was /"").append(v).append("/", but must be one of: ").append(Arrays.toString(enumType.getEnumConstants())).toString());}}return list;}public List getClassListProperty(String name) {Objects.checkNull("name", name);List list = new ArrayList();String value = properties.getProperty(name);if (value == null)return list;String values[] = value.split(":", -1);String arr$[] = values;int len$ = arr$.length;for (int i$ = 0; i$ < len$; i$++) {String v = arr$[i$];if (v.equals("")) {list.add(null);continue;}try {list.add(Class.forName(v));} catch (ClassNotFoundException cnfe) {throw new IllegalArgumentException((new StringBuilder()).append("A value in the list of items in the ").append(name).append(" property was /"").append(v).append("/", but a class was not found for this value").toString(), cnfe);}}return list;}private final Properties properties;}

 

package cn.vicky.utils;public final class Objects{ private Objects() { } public static String safeToString(Object object) { if(object == null) return "null"; if(callingSafeToString.get() != null) break MISSING_BLOCK_LABEL_145; callingSafeToString.set(Boolean.TRUE); String s1; try { String result = object.toString(); if(result != null && result.length() > 256) result = (new StringBuilder()).append(result.substring(0, 253)).append("...").toString(); s1 = result; } catch(RuntimeException e) { String s; try { s = (new StringBuilder()).append(object.getClass().getName()).append('@').append(Integer.toHexString(object.hashCode())).toString(); } // Misplaced declaration of an exception variable catch(String s) { callingSafeToString.remove(); break MISSING_BLOCK_LABEL_145; } callingSafeToString.remove(); return s; } callingSafeToString.remove(); return s1; Exception exception; callingSafeToString.remove(); throw exception; return (new StringBuilder()).append(object.getClass().getName()).append("[identityHashCode=0x").append(Integer.toHexString(System.identityHashCode(object))).append("]").toString(); } public static String fastToString(Object object) { if(object == null) return "null"; else return (new StringBuilder()).append(object.getClass().getName()).append('#').append(Integer.toHexString(System.identityHashCode(object))).toString(); } public static Object uncheckedCast(Object object) { return object; } public static void checkNull(String variableName, Object value) { if(value == null) throw new NullPointerException((new StringBuilder()).append("The value of ").append(variableName).append(" must not be null").toString()); else return; } private static final ThreadLocal callingSafeToString = new ThreadLocal();}

 

package cn.vicky.utils;import java.lang.reflect.Field;import java.lang.reflect.Method;import java.lang.reflect.ParameterizedType;import java.lang.reflect.Type;import java.util.ArrayList;import java.util.List;/** * 泛型工具类 * @author Vicky * */public class GenericsUtils {/** * 通过反射,获得指定类的父类的泛型参数的实际类型. 如BuyerServiceBean extends DaoSupport<Buyer> * * @param clazz clazz 需要反射的类,该类必须继承范型父类 * @param index 泛型参数所在索引,从0开始. * @return 范型参数的实际类型, 如果没有实现ParameterizedType接口，即不支持泛型，所以直接返回<code>Object.class</code> */ @SuppressWarnings("unchecked")public static Class getSuperClassGenricType(Class clazz, int index) { Type genType = clazz.getGenericSuperclass();//得到泛型父类 //如果没有实现ParameterizedType接口，即不支持泛型，直接返回Object.class if (!(genType instanceof ParameterizedType)) { return Object.class; } //返回表示此类型实际类型参数的Type对象的数组,数组里放的都是对应类型的Class, 如BuyerServiceBean extends DaoSupport<Buyer,Contact>就返回Buyer和Contact类型 Type[] params = ((ParameterizedType) genType).getActualTypeArguments(); if (index >= params.length || index < 0) { throw new RuntimeException("你输入的索引"+ (index<0 ? "不能小于0" : "超出了参数的总数")); } if (!(params[index] instanceof Class)) { return Object.class; } return (Class) params[index]; }/** * 通过反射,获得指定类的父类的第一个泛型参数的实际类型. 如BuyerServiceBean extends DaoSupport<Buyer> * * @param clazz clazz 需要反射的类,该类必须继承泛型父类 * @return 泛型参数的实际类型, 如果没有实现ParameterizedType接口，即不支持泛型，所以直接返回<code>Object.class</code> */ @SuppressWarnings("unchecked")public static Class getSuperClassGenricType(Class clazz) { return getSuperClassGenricType(clazz,0); }/** * 通过反射,获得方法返回值泛型参数的实际类型. 如: public Map<String, Buyer> getNames(){} * * @param Method method 方法 * @param int index 泛型参数所在索引,从0开始. * @return 泛型参数的实际类型, 如果没有实现ParameterizedType接口，即不支持泛型，所以直接返回<code>Object.class</code> */ @SuppressWarnings("unchecked")public static Class getMethodGenericReturnType(Method method, int index) { Type returnType = method.getGenericReturnType(); if(returnType instanceof ParameterizedType){ ParameterizedType type = (ParameterizedType) returnType; Type[] typeArguments = type.getActualTypeArguments(); if (index >= typeArguments.length || index < 0) { throw new RuntimeException("你输入的索引"+ (index<0 ? "不能小于0" : "超出了参数的总数")); } return (Class)typeArguments[index]; } return Object.class; }/** * 通过反射,获得方法返回值第一个泛型参数的实际类型. 如: public Map<String, Buyer> getNames(){} * * @param Method method 方法 * @return 泛型参数的实际类型, 如果没有实现ParameterizedType接口，即不支持泛型，所以直接返回<code>Object.class</code> */ @SuppressWarnings("unchecked")public static Class getMethodGenericReturnType(Method method) { return getMethodGenericReturnType(method, 0); } /** * 通过反射,获得方法输入参数第index个输入参数的所有泛型参数的实际类型. 如: public void add(Map<String, Buyer> maps, List<String> names){} * * @param Method method 方法 * @param int index 第几个输入参数 * @return 输入参数的泛型参数的实际类型集合, 如果没有实现ParameterizedType接口，即不支持泛型，所以直接返回空集合 */ @SuppressWarnings("unchecked")public static List<Class> getMethodGenericParameterTypes(Method method, int index) { List<Class> results = new ArrayList<Class>(); Type[] genericParameterTypes = method.getGenericParameterTypes(); if (index >= genericParameterTypes.length ||index < 0) { throw new RuntimeException("你输入的索引"+ (index<0 ? "不能小于0" : "超出了参数的总数")); } Type genericParameterType = genericParameterTypes[index]; if(genericParameterType instanceof ParameterizedType){ ParameterizedType aType = (ParameterizedType) genericParameterType; Type[] parameterArgTypes = aType.getActualTypeArguments(); for(Type parameterArgType : parameterArgTypes){ Class parameterArgClass = (Class) parameterArgType; results.add(parameterArgClass); } return results; } return results; }/** * 通过反射,获得方法输入参数第一个输入参数的所有泛型参数的实际类型. 如: public void add(Map<String, Buyer> maps, List<String> names){} * * @param Method method 方法 * @return 输入参数的泛型参数的实际类型集合, 如果没有实现ParameterizedType接口，即不支持泛型，所以直接返回空集合 */ @SuppressWarnings("unchecked")public static List<Class> getMethodGenericParameterTypes(Method method) { return getMethodGenericParameterTypes(method, 0); }/** * 通过反射,获得Field泛型参数的实际类型. 如: public Map<String, Buyer> names; * * @param Field field 字段 * @param int index 泛型参数所在索引,从0开始. * @return 泛型参数的实际类型, 如果没有实现ParameterizedType接口，即不支持泛型，所以直接返回<code>Object.class</code> */ @SuppressWarnings("unchecked")public static Class getFieldGenericType(Field field, int index) { Type genericFieldType = field.getGenericType(); if(genericFieldType instanceof ParameterizedType){ ParameterizedType aType = (ParameterizedType) genericFieldType; Type[] fieldArgTypes = aType.getActualTypeArguments(); if (index >= fieldArgTypes.length || index < 0) { throw new RuntimeException("你输入的索引"+ (index<0 ? "不能小于0" : "超出了参数的总数")); } return (Class)fieldArgTypes[index]; } return Object.class; }/** * 通过反射,获得Field泛型参数的实际类型. 如: public Map<String, Buyer> names; * * @param Field field 字段 * @param int index 泛型参数所在索引,从0开始. * @return 泛型参数的实际类型, 如果没有实现ParameterizedType接口，即不支持泛型，所以直接返回<code>Object.class</code> */ @SuppressWarnings("unchecked")public static Class getFieldGenericType(Field field) { return getFieldGenericType(field, 0); }}