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com.alipay.api.internal.util.json.JSONWriter Maven / Gradle / Ivy
package com.alipay.api.internal.util.json;
import java.beans.BeanInfo;
import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Array;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.text.CharacterIterator;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.text.StringCharacterIterator;
import java.util.Collection;
import java.util.Date;
import java.util.Iterator;
import java.util.Map;
import java.util.Stack;
import java.util.TimeZone;
import com.alipay.api.AlipayConstants;
import com.alipay.api.internal.mapping.ApiField;
import com.alipay.api.internal.mapping.ApiListField;
import com.alipay.api.internal.util.AlipayLogger;
public class JSONWriter {
private StringBuffer buf = new StringBuffer();
private Stack calls = new Stack();
private boolean emitClassName = true;
private DateFormat format;
public JSONWriter(boolean emitClassName) {
this.emitClassName = emitClassName;
}
public JSONWriter() {
this(false);
}
public JSONWriter(DateFormat format) {
this(false);
this.format = format;
}
public String write(Object object) {
return write(object, false);
}
public String write(Object object, boolean isApiModel) {
buf.setLength(0);
value(object, isApiModel);
return buf.toString();
}
public String write(long n) {
return String.valueOf(n);
}
public String write(double d) {
return String.valueOf(d);
}
public String write(char c) {
return "\"" + c + "\"";
}
public String write(boolean b) {
return String.valueOf(b);
}
private void value(Object object) {
value(object, false);
}
private void value(Object object, boolean isApiModel) {
if (object == null || cyclic(object)) {
add(null);
} else {
calls.push(object);
if (object instanceof Class)
string(object);
else if (object instanceof Boolean)
bool(((Boolean) object).booleanValue());
else if (object instanceof Number)
add(object);
else if (object instanceof String)
string(object);
else if (object instanceof Character)
string(object);
else if (object instanceof Map)
map((Map) object);
else if (object.getClass().isArray())
array(object, isApiModel);
else if (object instanceof Iterator)
array((Iterator) object, isApiModel);
else if (object instanceof Collection)
array(((Collection) object).iterator(), isApiModel);
else if (object instanceof Date)
date((Date) object);
else {
if (isApiModel)
model(object);
else
bean(object);
}
calls.pop();
}
}
private boolean cyclic(Object object) {
Iterator it = calls.iterator();
while (it.hasNext()) {
Object called = it.next();
if (object == called)
return true;
}
return false;
}
private void bean(Object object) {
add("{");
BeanInfo info;
boolean addedSomething = false;
try {
info = Introspector.getBeanInfo(object.getClass());
PropertyDescriptor[] props = info.getPropertyDescriptors();
for (int i = 0; i < props.length; ++i) {
PropertyDescriptor prop = props[i];
String name = prop.getName();
Method accessor = prop.getReadMethod();
if ((emitClassName || !"class".equals(name)) && accessor != null) {
if (!accessor.isAccessible())
accessor.setAccessible(true);
Object value = accessor.invoke(object, (Object[]) null);
if (value == null)
continue;
if (addedSomething)
add(',');
add(name, value);
addedSomething = true;
}
}
Field[] ff = object.getClass().getFields();
for (int i = 0; i < ff.length; ++i) {
Field field = ff[i];
Object value = field.get(object);
if (value == null)
continue;
if (addedSomething)
add(',');
add(field.getName(), value);
addedSomething = true;
}
} catch (IllegalAccessException iae) {
iae.printStackTrace();
} catch (InvocationTargetException ite) {
ite.getCause().printStackTrace();
ite.printStackTrace();
} catch (IntrospectionException ie) {
ie.printStackTrace();
}
add("}");
}
private void model(Object object) {
add("{");
boolean addedSomething = false;
Field[] ff = object.getClass().getDeclaredFields();
try {
for (int i = 0; i < ff.length; ++i) {
Field field = ff[i];
// 获取注解
ApiField jsonField = field.getAnnotation(ApiField.class);
ApiListField listField = field.getAnnotation(ApiListField.class);
// 优先处理列表类型注解,非列表类型才处理字段注解
if (listField != null) {
PropertyDescriptor pd = new PropertyDescriptor(field.getName(),
object.getClass());
Method accessor = pd.getReadMethod();
if (!accessor.isAccessible())
accessor.setAccessible(true);
Object value = accessor.invoke(object, (Object[]) null);
if (value == null)
continue;
if (addedSomething)
add(',');
add(listField.value(), value, true);
addedSomething = true;
} else if (jsonField != null) {
PropertyDescriptor pd = new PropertyDescriptor(field.getName(),
object.getClass());
Method accessor = pd.getReadMethod();
if (!accessor.isAccessible())
accessor.setAccessible(true);
Object value = accessor.invoke(object, (Object[]) null);
if (value == null)
continue;
if (addedSomething)
add(',');
add(jsonField.value(), value, true);
addedSomething = true;
}
}
} catch (IntrospectionException e1) {
AlipayLogger.logBizError(e1);
} catch (IllegalAccessException e2) {
AlipayLogger.logBizError(e2);
} catch (IllegalArgumentException e3) {
AlipayLogger.logBizError(e3);
} catch (InvocationTargetException e4) {
AlipayLogger.logBizError(e4);
}
add("}");
}
private void add(String name, Object value) {
add(name, value, false);
}
private void add(String name, Object value, boolean isApiModel) {
add('"');
add(name);
add("\":");
value(value, isApiModel);
}
private void map(Map map) {
add("{");
Iterator it = map.entrySet().iterator();
while (it.hasNext()) {
Map.Entry e = (Map.Entry) it.next();
value(e.getKey());
add(":");
value(e.getValue());
if (it.hasNext())
add(',');
}
add("}");
}
private void array(Iterator it) {
array(it, false);
}
private void array(Iterator it, boolean isApiModel) {
add("[");
while (it.hasNext()) {
value(it.next(), isApiModel);
if (it.hasNext())
add(",");
}
add("]");
}
private void array(Object object) {
array(object, false);
}
private void array(Object object, boolean isApiModel) {
add("[");
int length = Array.getLength(object);
for (int i = 0; i < length; ++i) {
value(Array.get(object, i), isApiModel);
if (i < length - 1)
add(',');
}
add("]");
}
private void bool(boolean b) {
add(b ? "true" : "false");
}
private void date(Date date) {
if (this.format == null) {
this.format = new SimpleDateFormat(AlipayConstants.DATE_TIME_FORMAT);
this.format.setTimeZone(TimeZone.getTimeZone(AlipayConstants.DATE_TIMEZONE));
}
add("\"");
add(format.format(date));
add("\"");
}
private void string(Object obj) {
add('"');
CharacterIterator it = new StringCharacterIterator(obj.toString());
for (char c = it.first(); c != CharacterIterator.DONE; c = it.next()) {
if (c == '"')
add("\\\"");
else if (c == '\\')
add("\\\\");
else if (c == '/')
add("\\/");
else if (c == '\b')
add("\\b");
else if (c == '\f')
add("\\f");
else if (c == '\n')
add("\\n");
else if (c == '\r')
add("\\r");
else if (c == '\t')
add("\\t");
else if (Character.isISOControl(c)) {
unicode(c);
} else {
add(c);
}
}
add('"');
}
private void add(Object obj) {
buf.append(obj);
}
private void add(char c) {
buf.append(c);
}
static char[] hex = "0123456789ABCDEF".toCharArray();
private void unicode(char c) {
add("\\u");
int n = c;
for (int i = 0; i < 4; ++i) {
int digit = (n & 0xf000) >> 12;
add(hex[digit]);
n <<= 4;
}
}
}
