这篇文章主要介绍了 java map转object与object转map实现代码的相关资料,需要的朋友可以参考下
java map转object与 object转map
1、定义一个实体类：
package reflect;
public class user {
private string name;
private int age;
public string getname() {
return name;
}
public void setname(string name) {
this.name = name;
}
public int getage() {
return age;
}
public void setage(int age) {
this.age = age;
}
}
2、map转object转换如下：
package reflect;
import java.beans.beaninfo;
import java.beans.introspector;
import java.beans.propertydescriptor;
import java.lang.reflect.method;
import java.util.hashmap;
import java.util.map;
public class testmaptoobject {
public static void main(string[] args){
//假设有一个map存放了一个对象的姓名和年龄
map<string,object> map = new hashmap<string,object>();
map.put("name", "kobi");
map.put("age", 39);
user user = transfermaptouser(map,user.class);
system.out.println(user.getname());
system.out.println(user.getage());
}
public static <t> t transfermaptouser(map<string,object> map,class<t> classt){
try {
return transfer(map,classt.newinstance());
} catch (instantiationexception ex) {
system.out.println("what the fuck?");
} catch (illegalaccessexception ex) {
system.out.println("what the fuck?");
}
return null;
}
public static <t> t transfer(map<string,object> map,object obj){
try {
beaninfo beaninfo = introspector.getbeaninfo(obj.getclass());
propertydescriptor[] propertydescriptors = beaninfo.getpropertydescriptors();
for (propertydescriptor property : propertydescriptors) {
string key = property.getname();
if (map.containskey(key)) {
object value = map.get(key);
// 得到property对应的setter方法
method setter = property.getwritemethod();
try {
setter.invoke(obj, value);
} catch (illegalargumentexception ex) {
system.out.println("what the fuck?");
}
}
}
} catch (exception ex) {
system.out.println("what the fuck?");
}
return (t) obj;
}
}
运行结果：
run:
kobi
39
成功构建 (总时间: 0 秒)
3、object转map：
package reflect;
import java.beans.beaninfo;
import java.beans.introspector;
import java.beans.propertydescriptor;
import java.lang.reflect.method;
import java.util.map;
import java.util.treemap;
public class testobjecttomap {
public static void main(string[] args){
user user = new user();
user.setname("kobi");
user.setage(39);
map<string, object=""> map = transbean2map(user);
system.out.println(map);
}
public static map<string, object=""> transbean2map(object obj) {
if (obj == null) {
return null;
}
treemap<string, object=""> map = new treemap<>();
try {
beaninfo beaninfo = introspector.getbeaninfo(obj.getclass());
propertydescriptor[] propertydescriptors = beaninfo.getpropertydescriptors();
for (propertydescriptor property : propertydescriptors) {
string key = property.getname();
// 过滤class属性
if (key.equals("class")) {
continue;
}
// 得到property对应的getter方法
method getter = property.getreadmethod();
object value = getter.invoke(obj);
map.put(key, value);
}
} catch (exception e) {
system.out.println("transbean2map error " + e);
}
return map;
}
}
运行结果：
run:
{age=39, name=kobi}
成功构建 (总时间: 0 秒)
以上就是详细介绍java map转object与object转map实现代码的详细内容。