我尝试按照最初的建议使用XStream，但事实证明，我想转储的对象图包含对XStream marshaller本身的引用，它并没有太好心（为什么它必须抛出一个异常而不是忽略它或记录一个很好的警告，我不确定。
然后我尝试了上面的user519500中的代码，但发现我需要一些调整。下面是一个可以滚动到项目中的类，该项目提供以下额外功能：
- 可控制最大递归深度
- 可以限制数组元素输出
- 可以忽略任何类、字段或类+字段组合的列表 - 只需传递一个数组，其中包含类名、类名+字段名对（用冒号分隔）或带冒号前缀的字段名的任意组合，即：
[<classname>][:<fieldname>]
- 不会输出同一对象两次（输出指示以前访问对象的时间并提供关联的哈希码） - 这避免了循环引用导致问题
您可以使用以下两种方法之一来调用它：
String dump = Dumper.dump(myObject);
String dump = Dumper.dump(myObject, maxDepth, maxArrayElements, ignoreList);
如上所述，您需要注意堆栈溢出，因此请使用最大递归深度工具以最大风险。
希望有人会发现这很有用！
package com.mycompany.myproject;
import java.lang.reflect.Array;
import java.lang.reflect.Field;
import java.util.HashMap;
public class Dumper {
private static Dumper instance = new Dumper();
protected static Dumper getInstance() {
return instance;
}
class DumpContext {
int maxDepth = 0;
int maxArrayElements = 0;
int callCount = 0;
HashMap<String, String> ignoreList = new HashMap<String, String>();
HashMap<Object, Integer> visited = new HashMap<Object, Integer>();
}
public static String dump(Object o) {
return dump(o, 0, 0, null);
}
public static String dump(Object o, int maxDepth, int maxArrayElements, String[] ignoreList) {
DumpContext ctx = Dumper.getInstance().new DumpContext();
ctx.maxDepth = maxDepth;
ctx.maxArrayElements = maxArrayElements;
if (ignoreList != null) {
for (int i = 0; i < Array.getLength(ignoreList); i++) {
int colonIdx = ignoreList[i].indexOf(':');
if (colonIdx == -1)
ignoreList[i] = ignoreList[i] + ":";
ctx.ignoreList.put(ignoreList[i], ignoreList[i]);
}
}
return dump(o, ctx);
}
protected static String dump(Object o, DumpContext ctx) {
if (o == null) {
return "<null>";
}
ctx.callCount++;
StringBuffer tabs = new StringBuffer();
for (int k = 0; k < ctx.callCount; k++) {
tabs.append("\t");
}
StringBuffer buffer = new StringBuffer();
Class oClass = o.getClass();
String oSimpleName = getSimpleNameWithoutArrayQualifier(oClass);
if (ctx.ignoreList.get(oSimpleName + ":") != null)
return "<Ignored>";
if (oClass.isArray()) {
buffer.append("\n");
buffer.append(tabs.toString().substring(1));
buffer.append("[\n");
int rowCount = ctx.maxArrayElements == 0 ? Array.getLength(o) : Math.min(ctx.maxArrayElements, Array.getLength(o));
for (int i = 0; i < rowCount; i++) {
buffer.append(tabs.toString());
try {
Object value = Array.get(o, i);
buffer.append(dumpValue(value, ctx));
} catch (Exception e) {
buffer.append(e.getMessage());
}
if (i < Array.getLength(o) - 1)
buffer.append(",");
buffer.append("\n");
}
if (rowCount < Array.getLength(o)) {
buffer.append(tabs.toString());
buffer.append(Array.getLength(o) - rowCount + " more array elements...");
buffer.append("\n");
}
buffer.append(tabs.toString().substring(1));
buffer.append("]");
} else {
buffer.append("\n");
buffer.append(tabs.toString().substring(1));
buffer.append("{\n");
buffer.append(tabs.toString());
buffer.append("hashCode: " + o.hashCode());
buffer.append("\n");
while (oClass != null && oClass != Object.class) {
Field[] fields = oClass.getDeclaredFields();
if (ctx.ignoreList.get(oClass.getSimpleName()) == null) {
if (oClass != o.getClass()) {
buffer.append(tabs.toString().substring(1));
buffer.append(" Inherited from superclass " + oSimpleName + ":\n");
}
for (int i = 0; i < fields.length; i++) {
String fSimpleName = getSimpleNameWithoutArrayQualifier(fields[i].getType());
String fName = fields[i].getName();
fields[i].setAccessible(true);
buffer.append(tabs.toString());
buffer.append(fName + "(" + fSimpleName + ")");
buffer.append("=");
if (ctx.ignoreList.get(":" + fName) == null &&
ctx.ignoreList.get(fSimpleName + ":" + fName) == null &&
ctx.ignoreList.get(fSimpleName + ":") == null) {
try {
Object value = fields[i].get(o);
buffer.append(dumpValue(value, ctx));
} catch (Exception e) {
buffer.append(e.getMessage());
}
buffer.append("\n");
}
else {
buffer.append("<Ignored>");
buffer.append("\n");
}
}
oClass = oClass.getSuperclass();
oSimpleName = oClass.getSimpleName();
}
else {
oClass = null;
oSimpleName = "";
}
}
buffer.append(tabs.toString().substring(1));
buffer.append("}");
}
ctx.callCount--;
return buffer.toString();
}
protected static String dumpValue(Object value, DumpContext ctx) {
if (value == null) {
return "<null>";
}
if (value.getClass().isPrimitive() ||
value.getClass() == java.lang.Short.class ||
value.getClass() == java.lang.Long.class ||
value.getClass() == java.lang.String.class ||
value.getClass() == java.lang.Integer.class ||
value.getClass() == java.lang.Float.class ||
value.getClass() == java.lang.Byte.class ||
value.getClass() == java.lang.Character.class ||
value.getClass() == java.lang.Double.class ||
value.getClass() == java.lang.Boolean.class ||
value.getClass() == java.util.Date.class ||
value.getClass().isEnum()) {
return value.toString();
} else {
Integer visitedIndex = ctx.visited.get(value);
if (visitedIndex == null) {
ctx.visited.put(value, ctx.callCount);
if (ctx.maxDepth == 0 || ctx.callCount < ctx.maxDepth) {
return dump(value, ctx);
}
else {
return "<Reached max recursion depth>";
}
}
else {
return "<Previously visited - see hashCode " + value.hashCode() + ">";
}
}
}
private static String getSimpleNameWithoutArrayQualifier(Class clazz) {
String simpleName = clazz.getSimpleName();
int indexOfBracket = simpleName.indexOf('[');
if (indexOfBracket != -1)
return simpleName.substring(0, indexOfBracket);
return simpleName;
}
}
