JAVA的Md5工具类（超多功能）

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必须要的jar：

<!-- https://mvnrepository.com/artifact/com.google.guava/guava --><dependency><groupId>com.google.guava</groupId><artifactId>guava</artifactId><version>19.0</version></dependency><!-- https://mvnrepository.com/artifact/com.google.code.gson/gson --><dependency><groupId>com.google.code.gson</groupId><artifactId>gson</artifactId><version>2.8.0</version></dependency>

工具类代码：

import java.io.File;import java.io.IOException;import java.lang.reflect.Field;import java.nio.charset.Charset;import java.util.List;import java.util.Map;import com.google.common.collect.Maps;import com.google.common.hash.Funnel;import com.google.common.hash.HashCode;import com.google.common.hash.HashFunction;import com.google.common.hash.Hasher;import com.google.common.hash.Hashing;import com.google.common.hash.PrimitiveSink;import com.google.common.io.Files;import com.google.gson.Gson;public class Md5Util {    private static HashFunction hf = Hashing.md5();    private static Charset defaultCharset = Charset.forName("UTF-8");    private Md5Util() {        throw new AssertionError("不要实例化工具类哦");    }    public static String md5(String data) {        HashCode hash = hf.newHasher().putString(data, defaultCharset).hash();        return hash.toString();    }    public static String md5(String data, Charset charset, boolean isUpperCase) {        HashCode hash = hf.newHasher().putString(data, charset == null ? defaultCharset : charset).hash();        return isUpperCase ? hash.toString().toUpperCase() : hash.toString();    }    public static String md5(byte[] bytes, boolean isUpperCase) {        HashCode hash = hf.newHasher().putBytes(bytes).hash();        return isUpperCase ? hash.toString().toUpperCase() : hash.toString();    }    public static String md5(File sourceFile, boolean isUpperCase) {        HashCode hash = hf.newHasher().putObject(sourceFile, new Funnel<File>() {            private static final long serialVersionUID = 2757585325527511209L;            @Override            public void funnel(File from, PrimitiveSink into) {                try {                    into.putBytes(Files.toByteArray(from));                } catch (IOException e) {                    throw new RuntimeException(e);                }            }        }).hash();        return isUpperCase ? hash.toString().toUpperCase() : hash.toString();    }    /**     * 将其转换为json后，再进行md5     *     * @param object 数据源可以是任何类型的对象     * @param isUpperCase 结果是否大写     * @param charset 涉及到字符串时的操作编码，默认是utf-8     * @return     */    public static String md5(Object object, boolean isUpperCase, Charset charset) {        Hasher hasher = hf.newHasher();        Gson gson = new Gson();        String json = gson.toJson(object);        HashCode hash = hasher.putString(json, charset == null ? defaultCharset : charset).hash();        return isUpperCase ? hash.toString().toUpperCase() : hash.toString();    }    /**     * @param object 只能是封装了数据的实体类，不可以是map，List等     * @param fieldNames 需要参与md5计算的字段属性名，如果该属性也是一个封住数据实体类话，.后跟上具体属性名即可。如：role.level.id     * @param isUpperCase 结果是否大写     * @param charset 涉及到字符串时的操作编码，默认是utf-8     * @return     */    public static String md5(Object object, List<String> fieldNames, boolean isUpperCase, Charset charset) {        HashCode hash = hf.newHasher().putObject(object, new Funnel<Object>() {            private static final long serialVersionUID = -5236251432355557848L;            @Override            public void funnel(Object from, PrimitiveSink into) {                Map<String, Field> allField = getAllField(object);                for (String fieldName : fieldNames) {                    try {                        if (fieldName.contains(".")) {                            handleDeepField(object, charset, into, allField, fieldName);                        } else {                            handleField(object, charset, into, allField, fieldName);                        }                    } catch (Exception e) {                        throw new RuntimeException(e);                    }                }            }        }).hash();        return isUpperCase ? hash.toString().toUpperCase() : hash.toString();    }    private static void handleDeepField(Object tempValue, Charset charset, PrimitiveSink into, Map<String, Field> tempAllField, String fieldName)            throws NoSuchFieldException, IllegalAccessException {        Field field = null;        String[] names = fieldName.split("\\.");        for (String name : names) {            field = tempAllField.get(name);            if (field == null) {                throw new NoSuchFieldException(fieldName);            }            field.setAccessible(true);            tempValue = field.get(tempValue);            field.setAccessible(false);            tempAllField = getAllField(tempValue);        }        stuffFieldValue(tempValue, charset, into);    }    private static void handleField(Object object, Charset charset, PrimitiveSink into, Map<String, Field> allField, String fieldName)            throws NoSuchFieldException, IllegalAccessException {        Field field = allField.get(fieldName);        if (field == null) {            throw new NoSuchFieldException(fieldName);        }        field.setAccessible(true);        Object tempValue = field.get(object);        stuffFieldValue(tempValue, charset, into);        field.setAccessible(false);    }    private static void stuffFieldValue(Object value, Charset charset, PrimitiveSink into) throws IllegalAccessException {        if (value instanceof Integer) {            into.putInt((int) value);        } else if (value instanceof Long) {            into.putLong((long) value);        } else if (value instanceof Float) {            into.putFloat((float) value);        } else if (value instanceof Double) {            into.putDouble((double) value);        } else if (value instanceof Short) {            into.putShort((short) value);        } else if (value instanceof Byte) {            into.putByte((byte) value);        } else if (value instanceof Boolean) {            into.putBoolean((boolean) value);        } else if (value instanceof Byte) {            into.putByte((byte) value);        } else if (value instanceof Character) {            into.putChar((char) value);        } else if (value instanceof String) {            into.putString((String) value, charset == null ? defaultCharset : charset);        } else {            throw new IllegalArgumentException(value.getClass() + " is not basic data type");        }    }    private static Map<String, Field> getAllField(Object object) {        Map<String, Field> fieldMap = Maps.newHashMap();        if (object.getClass().getName().equals(Object.class.getName())) {            return fieldMap;        }        Class<?> tempClass = object.getClass();        Field[] declaredFields = null;        while (true) {            declaredFields = tempClass.getDeclaredFields();            for (Field field : declaredFields) {                fieldMap.put(field.getName(), field);            }            tempClass = tempClass.getSuperclass();            if (tempClass.getName().equals(Object.class.getName())) {                break;            }        }        return fieldMap;    }}

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