JavaBean、xml、json、map相互转换

1.JavaBean转xml

<!-- xstream -->
<dependency>
<groupId>com.thoughtworks.xstream</groupId>
<artifactId>xstream</artifactId>
<version>1.4.7</version>
</dependency>

public static XStream xstream = new XStream();
public static String objectToXml(Object object, String key,Class clazz)
{
xstream.alias(key, clazz);
return xstream.toXML(object);
}

public static String objectToXml(Object object, Map<String,Class> map)
{
Class clazz;
for (String key : map.keySet())
{
clazz = map.get(key);
if(clazz!=null)
{
//				xstream.alias("xml", clazz);
xstream.alias(key, clazz);//把className替换成key
}
}
return xstream.toXML(object);
}

2.xml转JavaBean

public static Object xmlToObject(String xml, Class clazz)
{
if (clazz != null) //微信公众平台开发的时候需要把更节点替换成xml ！！！！
{
xml = xml.replace("<xml>", "<" + clazz.getName() + ">");
xml = xml.replace("</xml>", "</" + clazz.getName() + ">");
}
try
{
Object fromXML = xstream.fromXML(xml);
return fromXML;
} catch (Exception e)
{
e.printStackTrace();
return null;
}
}

public static Object xmlToObject(InputStream xml, Class clazz)
{

BufferedReader bf;
try
{
bf = new BufferedReader(new InputStreamReader(xml, "UTF-8"));
// 最好在将字节流转换为字符流的时候 进行转码
StringBuffer buffer = new StringBuffer();
String line = "";
while ((line = bf.readLine()) != null)
{
buffer.append(line);
}
return xmlToObject(buffer.toString(), clazz);
} catch (Exception e)
{
e.printStackTrace();
}
return null;
}

3.xml转Map

public static Map<String, Object> xmlToMap(InputStream input)
{
Map<String, Object> map = new HashMap<String, Object>();
try
{
SAXReader saxReader = new SAXReader();
Document doc = saxReader.read(input);
Element root = doc.getRootElement();
List<Element> elements = root.elements();
for (Element element : elements)
{
map.put(element.getName(), element.getText());
System.out.println("map:" + element.getName() + ":" + element.getText());
}
} catch (DocumentException e)
{
e.printStackTrace();
throw new RuntimeException(e);
}
return map;
}

4.Map转JavaBean

public static void mapToBean(Map<String, Object> map, Object obj)
{
BeanInfo beanInfo = null;
try
{
beanInfo = Introspector.getBeanInfo(obj.getClass());
} catch (IntrospectionException e1)
{
e1.printStackTrace();
}
PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();

for (PropertyDescriptor property : propertyDescriptors)
{
try
{
String key = property.getName();
String key2 = key.substring(0, 1).toUpperCase() + key.substring(1); //首字母大写
//getAbcAbc()  -> abcAbc（key）   ->AbcAbc（key2）  避免类似微信开发 字段首字母大写的情况
if (map.containsKey(key))
{
Object value = map.get(key);
System.out.println("--------key "+key+"----map.get(key)"+map.get(key));
// 得到property对应的setter方法
Method setter = property.getWriteMethod();
setter.invoke(obj, value);
}
else if (map.containsKey(key2))
{
Object value = map.get(key2);
System.out.println("--------key2 "+key2+"----map.get(key)"+map.get(key2));
Method setter = property.getWriteMethod();
setter.invoke(obj, value);
}
} catch (Exception e)
{
System.out.println("transMap2Bean Error " + e);
continue;
}
}
return;
}