Java把Map转为对象的实现代码
作者：Best_Liu~
在项目开发中,经常碰到map转实体对象或者对象转map的场景,工作中,很多时候我们可能比较喜欢使用第三方jar包的API对他们进行转化,但这里,我想通过反射的方式对他们做转化,感兴趣的同学跟着小编来看看吧
1、map转java对象
import com.alibaba.fastjson.JSON; import com.alibaba.fastjson.JSONObject; import com.mes.common.core.utils.StringUtils; import java.beans.BeanInfo; import java.beans.IntrospectionException; import java.beans.Introspector; import java.beans.PropertyDescriptor; import java.lang.reflect.Method; import java.util.HashMap; import java.util.Iterator; import java.util.Map; import java.util.logging.Level; import java.util.logging.Logger;
/**
* @Author: best_liu
* @Description: map转java对象
* @Date: 8:35 2022/3/22
**/
public static Object convertToObject(Class clazz, Map<String, Object> map) throws
IntrospectionException, InstantiationException, IllegalAccessException {
BeanInfo bi = Introspector.getBeanInfo(clazz);
Object obj = clazz.newInstance();
PropertyDescriptor[] pds = bi.getPropertyDescriptors();
String pName;
for (PropertyDescriptor pd : pds) {
pName = pd.getName();
if (map.containsKey(pName)) {
try {
if (pd.getPropertyType().getName().equals("java.lang.Long")) {
if(StringUtils.isNotEmpty(map.get(pName).toString())){
pd.getWriteMethod().invoke(obj, Long.parseLong(map.get(pName).toString()));
}
// else{
// pd.getWriteMethod().invoke(obj, map.get(pName));
// }
} else {
pd.getWriteMethod().invoke(obj, map.get(pName));
}
} catch (Exception ex) {
Logger.getLogger(MapUtil.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
return obj;
}2、java对象转map
/**
* @Author: best_liu
* @Description: java对象转map
* @Date: 8:35 2022/3/22
**/
public static Map<String, String> objectToMap(Object obj) {
if (obj == null) {
return null;
}
Map<String, String> map = new HashMap<String, String>();
try {
BeanInfo beanInfo = Introspector.getBeanInfo(obj.getClass());
PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
for (PropertyDescriptor property : propertyDescriptors) {
String key = property.getName();
if (key.compareToIgnoreCase("class") == 0) {
continue;
}
Method getter = property.getReadMethod();
Object value = getter != null ? getter.invoke(obj) : null;
String v = null;
if (value != null) {
v = value.toString();
}
map.put(key, v);
}
} catch (Exception e) {
e.printStackTrace();
}
return map;
}
/**
* @Author: best_liu
* @Description: java对象转map
* @Date: 8:35 2022/3/22
**/
public static Map<String, Object> objectToMapObj(Object obj) {
if (obj == null) {
return null;
}
Map<String, Object> map = new HashMap<String, Object>();
try {
BeanInfo beanInfo = Introspector.getBeanInfo(obj.getClass());
PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
for (PropertyDescriptor property : propertyDescriptors) {
String key = property.getName();
if (key.compareToIgnoreCase("class") == 0) {
continue;
}
Method getter = property.getReadMethod();
Object value = getter != null ? getter.invoke(obj) : null;
map.put(key, value);
}
} catch (Exception e) {
e.printStackTrace();
}
return map;
}3、Map转换为Json字符串
/**
* @Author: best_liu
* @Description: Map转换为Json字符串
* @Date: 8:35 2022/3/22
**/
public static String mapToJsonString(Map map) {
JSONObject json = new JSONObject();
Iterator<Map.Entry<String, String>> entries = map.entrySet().iterator();
while (entries.hasNext()) {
Map.Entry<String, String> entry = entries.next();
json.put(entry.getKey(), entry.getValue());
}
return json.toString();
}4、Json字符串转换为Map
/**
* @Author: best_liu
* @Description: Json字符串转换为Map
* @Date: 8:35 2022/3/22
**/
public static Map<String, Long> jsonStringToMap(String str) {
Map<String, Long> map = (Map<String, Long>) JSON.parse(str);
return map;
}到此这篇关于Java把Map转为对象的实现代码的文章就介绍到这了,更多相关Java Map转为对象内容请搜索脚本之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持脚本之家！