使用反射输出对象中变量的所有值

Question

我想输出对象中变量的所有值。

目前我正在使用ReflectionToStringBuilder但问题是它在输出集合时包含[,]字符。

下面是一个示例。

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import org.apache.commons.lang.builder.ReflectionToStringBuilder;
import org.apache.commons.lang.builder.ToStringStyle;
public class Test 
{
public int x = 10;
public int y = 20;
public String example = "This is some text, with a comma";
public Collection<Integer> collection = new ArrayList<>(Arrays.asList(1, 2, 3, 4, 5));
public static void main(String args[])
{
System.out.println(ReflectionToStringBuilder.toString(new Test(),
ToStringStyle.NO_FIELD_NAMES_STYLE));
}
}

输出

Test@efb78af[10,20,This is some text, with a comma,[1, 2, 3, 4, 5]]

我尝试定义自己的ToStringStyle但似乎没有任何选项可以删除方括号和逗号。

import org.apache.commons.lang3.builder.ToStringStyle;
public class ValueOnlyToStringStyle extends ToStringStyle
{
public static final ToStringStyle VALUE_ONLY = new ValueOnlyToStringStyle();
private static final long serialVersionUID = 1L;
private ValueOnlyToStringStyle() 
{
super();
this.setContentStart("");
this.setFieldSeparator("  ");
this.setFieldSeparatorAtStart(true);
this.setContentEnd("");
this.setUseClassName(false);
this.setUseFieldNames(false);
this.setArrayContentDetail(true);
this.setArrayStart(" ");
this.setArrayEnd(" ");
this.setArraySeparator(" ");
this.setDefaultFullDetail(true);
this.setNullText("");
this.setSizeStartText("");
this.setSizeStartText("");
this.setFieldNameValueSeparator(" ");
this.setUseShortClassName(false);
this.setUseIdentityHashCode(false);
this.setSummaryObjectStartText(" ");
this.setSummaryObjectEndText(" ");
}
}

输出

10  20  This is some text, with a comma  [1, 2, 3, 4, 5]

我需要的是只获取没有添加字符的值。

10  20  This is some text, with a comma 1 2 3 4 5

如何实现这一点？

Answer 1

我已经在我的机器上尝试了代码，它应该适用于您的示例。

class MyToStringStyle extends ToStringStyle {
public MyToStringStyle() {
setFieldSeparator(" ");
setUseFieldNames(false);
setUseIdentityHashCode(false);
setUseClassName(false);
setContentStart("");
setContentEnd("");
}
@Override
protected void appendDetail(StringBuffer buffer, String fieldName, Collection<?> coll) {
if (coll.isEmpty()) return;
Iterator iter = coll.iterator();
buffer.append(iter.next());
while (iter.hasNext()) {
buffer.append(" ").append(iter.next());
}
}
}

Answer 2

我决定编辑代码，因为我构建了一个自定义的ReflectionToStringBuilder方法。这是方法：

public static String toString(Object object) {
Class<?> clazz = object.getClass();
Field[] fields = clazz.getDeclaredFields();
StringBuilder stringBuilder = new StringBuilder();
for (Field field : fields) {
try {
field.setAccessible(true);
Object value = field.get(object);
// check if the value is actually a list
if (List.class.isAssignableFrom(value.getClass())) {
// this for some reason gives the unchecked cast warning, but we actually are
// checking it so don't worry!
@SuppressWarnings("unchecked")
List<Object> list = (List<Object>) value;
for (Object element : list) {
stringBuilder.append(element.toString()).append(" ");
}
} else if (value.getClass().isArray()) {
Object[] array = (Object[]) value;
for (Object element : array) {
stringBuilder.append(element.toString()).append(" ");
}
} else {
stringBuilder.append(value.toString()).append(" ");
}
} catch (IllegalArgumentException | IllegalAccessException e) {
e.printStackTrace();
}
}
return stringBuilder.toString();
}

我已经测试过它，它运行良好。

我的班级：

int x = 0;
String string = "string0";
List<String> stringList = Arrays.asList("string1");
String[] stringArray = {"string3", "string4"};
public static void main(String[] args) {
Test test = new Test();
System.out.println(toString(test));
}

输出：

0 string0 string1 string3 string4