反射实例

package test;

import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;

public class TestReflex {

    public static Map<String,String> convertResponseStr(Object obj){
        try{
            Map<String,String> mapRes = new HashMap<String,String>();
            Class<? extends Object> ownerClass = obj.getClass();
            Field [] fields = ownerClass.getDeclaredFields();
            for(Field f : fields){
                String methodName = f.getName().substring(0, 1).toUpperCase()+ f.getName().substring(1);
                Method  method = ownerClass.getMethod("get" + methodName);
                Object getValue = method.invoke(obj);
                String typeName = method.getGenericReturnType().toString();
                if(getValue == null){
                    if(typeName.contains("java.util.List"))getValue = new ArrayList<>();
                    else if(typeName.contains("java.util.Map"))getValue = new HashMap<>();
                    else if(typeName.contains("java.lang.String"))getValue = "";
                    else if(typeName.contains("java.lang.Integer"))getValue = 0;
                    else if(typeName.contains("java.lang.Double"))getValue = 0;
                    else if(typeName.contains("java.util.Date"))getValue ="";
                    else getValue = "";
                }
                mapRes.put(f.getName(), String.valueOf(getValue));
            }
            return mapRes;
        }catch(Exception e){
            e.printStackTrace();
            return new HashMap<String,String>();
        }
    }
    
    public static void main(String[] args){
        TestObject to = new TestObject();
        to.setName("to001");
        to.setAge(28);
        System.out.println(convertResponseStr(to));
    }
}

class TestObject{
    private String name;
    private Integer age;
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public Integer getAge() {
        return age;
    }
    public void setAge(Integer age) {
        this.age = age;
    }
}