异常转字符串输出

src/main/java/cn/hnthyy/thmz/Utils/ReflectUtils.java

@@ -0,0 +1,328 @@
+package cn.hnthyy.thmz.Utils;
+
+
+import cn.hutool.core.convert.Convert;
+import lombok.extern.slf4j.Slf4j;
+import org.apache.commons.lang3.StringUtils;
+import org.apache.commons.lang3.Validate;
+import org.apache.poi.ss.usermodel.DateUtil;
+
+import java.lang.reflect.Field;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.lang.reflect.Modifier;
+import java.lang.reflect.ParameterizedType;
+import java.lang.reflect.Type;
+import java.util.Date;
+
+/**
+ * 反射工具类. 提供调用getter/setter方法, 访问私有变量, 调用私有方法, 获取泛型类型Class, 被AOP过的真实类等工具函数.
+ *
+ * @author
+ */
+@SuppressWarnings("rawtypes")
+@Slf4j
+public class ReflectUtils {
+    private static final String SETTER_PREFIX = "set" ;
+
+    private static final String GETTER_PREFIX = "get" ;
+
+    private static final String CGLIB_CLASS_SEPARATOR = "$$" ;
+
+
+    /**
+     * 调用Getter方法.
+     * 支持多级，如：对象名.对象名.方法
+     */
+    @SuppressWarnings("unchecked")
+    public static <E> E invokeGetter(Object obj, String propertyName) {
+        Object object = obj;
+        for (String name : StringUtils.split(propertyName, ".")) {
+            String getterMethodName = GETTER_PREFIX + StringUtils.capitalize(name);
+            object = invokeMethod(object, getterMethodName, new Class[]{}, new Object[]{});
+        }
+        return (E) object;
+    }
+
+    /**
+     * 调用Setter方法, 仅匹配方法名。
+     * 支持多级，如：对象名.对象名.方法
+     */
+    public static <E> void invokeSetter(Object obj, String propertyName, E value) {
+        Object object = obj;
+        String[] names = StringUtils.split(propertyName, ".");
+        for (int i = 0; i < names.length; i++) {
+            if (i < names.length - 1) {
+                String getterMethodName = GETTER_PREFIX + StringUtils.capitalize(names[i]);
+                object = invokeMethod(object, getterMethodName, new Class[]{}, new Object[]{});
+            } else {
+                String setterMethodName = SETTER_PREFIX + StringUtils.capitalize(names[i]);
+                invokeMethodByName(object, setterMethodName, new Object[]{value});
+            }
+        }
+    }
+
+    /**
+     * 直接读取对象属性值, 无视private/protected修饰符, 不经过getter函数.
+     */
+    @SuppressWarnings("unchecked")
+    public static <E> E getFieldValue(final Object obj, final String fieldName) {
+        Field field = getAccessibleField(obj, fieldName);
+        if (field == null) {
+            log.debug("在 [" + obj.getClass() + "] 中，没有找到 [" + fieldName + "] 字段 ");
+            return null;
+        }
+        E result = null;
+        try {
+            result = (E) field.get(obj);
+        } catch (IllegalAccessException e) {
+            log.error("不可能抛出的异常{}", e.getMessage());
+        }
+        return result;
+    }
+
+    /**
+     * 直接设置对象属性值, 无视private/protected修饰符, 不经过setter函数.
+     */
+    public static <E> void setFieldValue(final Object obj, final String fieldName, final E value) {
+        Field field = getAccessibleField(obj, fieldName);
+        if (field == null) {
+            // throw new IllegalArgumentException("在 [" + obj.getClass() + "] 中，没有找到 [" + fieldName + "] 字段 ");
+            log.debug("在 [" + obj.getClass() + "] 中，没有找到 [" + fieldName + "] 字段 ");
+            return;
+        }
+        try {
+            field.set(obj, value);
+        } catch (IllegalAccessException e) {
+            log.error("不可能抛出的异常: {}", e.getMessage());
+        }
+    }
+
+    /**
+     * 直接调用对象方法, 无视private/protected修饰符.
+     * 用于一次性调用的情况，否则应使用getAccessibleMethod()函数获得Method后反复调用.
+     * 同时匹配方法名+参数类型，
+     */
+    @SuppressWarnings("unchecked")
+    public static <E> E invokeMethod(final Object obj, final String methodName, final Class<?>[] parameterTypes,
+                                     final Object[] args) {
+        if (obj == null || methodName == null) {
+            return null;
+        }
+        Method method = getAccessibleMethod(obj, methodName, parameterTypes);
+        if (method == null) {
+            log.debug("在 [" + obj.getClass() + "] 中，没有找到 [" + methodName + "] 方法 ");
+            return null;
+        }
+        try {
+            return (E) method.invoke(obj, args);
+        } catch (Exception e) {
+            String msg = "method: " + method + ", obj: " + obj + ", args: " + args + "" ;
+            throw convertReflectionExceptionToUnchecked(msg, e);
+        }
+    }
+
+    /**
+     * 直接调用对象方法, 无视private/protected修饰符，
+     * 用于一次性调用的情况，否则应使用getAccessibleMethodByName()函数获得Method后反复调用.
+     * 只匹配函数名，如果有多个同名函数调用第一个。
+     */
+    @SuppressWarnings("unchecked")
+    public static <E> E invokeMethodByName(final Object obj, final String methodName, final Object[] args) {
+        Method method = getAccessibleMethodByName(obj, methodName, args.length);
+        if (method == null) {
+            // 如果为空不报错，直接返回空。
+            log.debug("在 [" + obj.getClass() + "] 中，没有找到 [" + methodName + "] 方法 ");
+            return null;
+        }
+        try {
+            // 类型转换（将参数数据类型转换为目标方法参数类型）
+            Class<?>[] cs = method.getParameterTypes();
+            for (int i = 0; i < cs.length; i++) {
+                if (args[i] != null && !args[i].getClass().equals(cs[i])) {
+                    if (cs[i] == String.class) {
+                        args[i] = Convert.toStr(args[i]);
+                        if (StringUtils.endsWith((String) args[i], ".0")) {
+                            args[i] = StringUtils.substringBefore((String) args[i], ".0");
+                        }
+                    } else if (cs[i] == Integer.class) {
+                        args[i] = Convert.toInt(args[i]);
+                    } else if (cs[i] == Long.class) {
+                        args[i] = Convert.toLong(args[i]);
+                    } else if (cs[i] == Double.class) {
+                        args[i] = Convert.toDouble(args[i]);
+                    } else if (cs[i] == Float.class) {
+                        args[i] = Convert.toFloat(args[i]);
+                    } else if (cs[i] == Date.class) {
+                        if (args[i] instanceof String) {
+                            args[i] = cn.hutool.core.date.DateUtil.parse((String) args[i]);
+                        } else {
+                            args[i] = DateUtil.getJavaDate((Double) args[i]);
+                        }
+                    } else if (cs[i] == boolean.class || cs[i] == Boolean.class) {
+                        args[i] = Convert.toBool(args[i]);
+                    }
+                }
+            }
+            return (E) method.invoke(obj, args);
+        } catch (Exception e) {
+            String msg = "method: " + method + ", obj: " + obj + ", args: " + args + "" ;
+            throw convertReflectionExceptionToUnchecked(msg, e);
+        }
+    }
+
+    /**
+     * 循环向上转型, 获取对象的DeclaredField, 并强制设置为可访问.
+     * 如向上转型到Object仍无法找到, 返回null.
+     */
+    public static Field getAccessibleField(final Object obj, final String fieldName) {
+        // 为空不报错。直接返回 null
+        if (obj == null) {
+            return null;
+        }
+        Validate.notBlank(fieldName, "fieldName can't be blank");
+        for (Class<?> superClass = obj.getClass(); superClass != Object.class; superClass = superClass.getSuperclass()) {
+            try {
+                Field field = superClass.getDeclaredField(fieldName);
+                makeAccessible(field);
+                return field;
+            } catch (NoSuchFieldException e) {
+                continue;
+            }
+        }
+        return null;
+    }
+
+    /**
+     * 循环向上转型, 获取对象的DeclaredMethod,并强制设置为可访问.
+     * 如向上转型到Object仍无法找到, 返回null.
+     * 匹配函数名+参数类型。
+     * 用于方法需要被多次调用的情况. 先使用本函数先取得Method,然后调用Method.invoke(Object obj, Object... args)
+     */
+    public static Method getAccessibleMethod(final Object obj, final String methodName,
+                                             final Class<?>... parameterTypes) {
+        // 为空不报错。直接返回 null
+        if (obj == null) {
+            return null;
+        }
+        Validate.notBlank(methodName, "methodName can't be blank");
+        for (Class<?> searchType = obj.getClass(); searchType != Object.class; searchType = searchType.getSuperclass()) {
+            try {
+                Method method = searchType.getDeclaredMethod(methodName, parameterTypes);
+                makeAccessible(method);
+                return method;
+            } catch (NoSuchMethodException e) {
+                continue;
+            }
+        }
+        return null;
+    }
+
+    /**
+     * 循环向上转型, 获取对象的DeclaredMethod,并强制设置为可访问.
+     * 如向上转型到Object仍无法找到, 返回null.
+     * 只匹配函数名。
+     * 用于方法需要被多次调用的情况. 先使用本函数先取得Method,然后调用Method.invoke(Object obj, Object... args)
+     */
+    public static Method getAccessibleMethodByName(final Object obj, final String methodName, int argsNum) {
+        // 为空不报错。直接返回 null
+        if (obj == null) {
+            return null;
+        }
+        Validate.notBlank(methodName, "methodName can't be blank");
+        for (Class<?> searchType = obj.getClass(); searchType != Object.class; searchType = searchType.getSuperclass()) {
+            Method[] methods = searchType.getDeclaredMethods();
+            for (Method method : methods) {
+                if (method.getName().equals(methodName) && method.getParameterTypes().length == argsNum) {
+                    makeAccessible(method);
+                    return method;
+                }
+            }
+        }
+        return null;
+    }
+
+    /**
+     * 改变private/protected的方法为public，尽量不调用实际改动的语句，避免JDK的SecurityManager抱怨。
+     */
+    public static void makeAccessible(Method method) {
+        if ((!Modifier.isPublic(method.getModifiers()) || !Modifier.isPublic(method.getDeclaringClass().getModifiers()))
+                && !method.isAccessible()) {
+            method.setAccessible(true);
+        }
+    }
+
+    /**
+     * 改变private/protected的成员变量为public，尽量不调用实际改动的语句，避免JDK的SecurityManager抱怨。
+     */
+    public static void makeAccessible(Field field) {
+        if ((!Modifier.isPublic(field.getModifiers()) || !Modifier.isPublic(field.getDeclaringClass().getModifiers())
+                || Modifier.isFinal(field.getModifiers())) && !field.isAccessible()) {
+            field.setAccessible(true);
+        }
+    }
+
+    /**
+     * 通过反射, 获得Class定义中声明的泛型参数的类型, 注意泛型必须定义在父类处
+     * 如无法找到, 返回Object.class.
+     */
+    @SuppressWarnings("unchecked")
+    public static <T> Class<T> getClassGenricType(final Class clazz) {
+        return getClassGenricType(clazz, 0);
+    }
+
+    /**
+     * 通过反射, 获得Class定义中声明的父类的泛型参数的类型.
+     * 如无法找到, 返回Object.class.
+     */
+    public static Class getClassGenricType(final Class clazz, final int index) {
+        Type genType = clazz.getGenericSuperclass();
+
+        if (!(genType instanceof ParameterizedType)) {
+            log.debug(clazz.getSimpleName() + "'s superclass not ParameterizedType");
+            return Object.class;
+        }
+
+        Type[] params = ((ParameterizedType) genType).getActualTypeArguments();
+
+        if (index >= params.length || index < 0) {
+            log.debug("Index: " + index + ", Size of " + clazz.getSimpleName() + "'s Parameterized Type: "
+                    + params.length);
+            return Object.class;
+        }
+        if (!(params[index] instanceof Class)) {
+            log.debug(clazz.getSimpleName() + " not set the actual class on superclass generic parameter");
+            return Object.class;
+        }
+
+        return (Class) params[index];
+    }
+
+    public static Class<?> getUserClass(Object instance) {
+        if (instance == null) {
+            throw new RuntimeException("Instance must not be null");
+        }
+        Class clazz = instance.getClass();
+        if (clazz != null && clazz.getName().contains(CGLIB_CLASS_SEPARATOR)) {
+            Class<?> superClass = clazz.getSuperclass();
+            if (superClass != null && !Object.class.equals(superClass)) {
+                return superClass;
+            }
+        }
+        return clazz;
+
+    }
+
+    /**
+     * 将反射时的checked exception转换为unchecked exception.
+     */
+    public static RuntimeException convertReflectionExceptionToUnchecked(String msg, Exception e) {
+        if (e instanceof IllegalAccessException || e instanceof IllegalArgumentException
+                || e instanceof NoSuchMethodException) {
+            return new IllegalArgumentException(msg, e);
+        } else if (e instanceof InvocationTargetException) {
+            return new RuntimeException(msg, ((InvocationTargetException) e).getTargetException());
+        }
+        return new RuntimeException(msg, e);
+    }
+}

src/main/java/cn/hnthyy/thmz/Utils/StringUtil.java

@@ -1,8 +1,11 @@
 package cn.hnthyy.thmz.Utils;
 
+import cn.hutool.core.io.IoUtil;
 import org.apache.commons.lang3.StringUtils;
 import org.springframework.util.PropertyPlaceholderHelper;
 
+import java.io.PrintWriter;
+import java.io.StringWriter;
 import java.util.Arrays;
 import java.util.List;
 import java.util.Map;
@@ -241,4 +244,21 @@ public class StringUtil {
         Matcher m = p.matcher(s);
         return m.matches();
     }
+
+    public static String getExceptionToString(Throwable e) {
+        if (e == null){
+            return "";
+        }
+        PrintWriter printWriter = null;
+        try {
+            StringWriter stringWriter = new StringWriter();
+             printWriter = new PrintWriter(stringWriter);
+            e.printStackTrace(printWriter);
+            return stringWriter.toString();
+        }finally {
+            if(printWriter != null){
+                printWriter.close();
+            }
+        }
+    }
 }

src/main/java/cn/hnthyy/thmz/interceptor/GlobalExceptionHandler.java

@@ -2,6 +2,7 @@ package cn.hnthyy.thmz.interceptor;
 
 
 import cn.hnthyy.thmz.Utils.R;
+import cn.hnthyy.thmz.Utils.StringUtil;
 import cn.hnthyy.thmz.common.exception.BizException;
 import cn.hnthyy.thmz.entity.AuthException;
 import lombok.extern.slf4j.Slf4j;
@@ -56,6 +57,7 @@ public class GlobalExceptionHandler {
     @ResponseBody
     public R handleException(Exception e){
         log.error("系统报错", e);
-        return R.error();
+        String exceptionToString = StringUtil.getExceptionToString(e);
+        return R.error(StringUtils.substring(exceptionToString,0,1000 ));
     }
 }