使用extends定制化类

一.场景示例
微服务间经常会涉及到服务的相互调用,现在假设某个服务对外暴露的接口规定入参格式都为Map.

二.常见的参数封装方式

   		Integer a = 123;
        Long id = 123L;
        Boolean flag = Boolean.TRUE;
        String b = "abc";
        Map<String,String> paramMap = new HashMap<>();
        paramMap.put("a", a.toString());
        paramMap.put("b",b);
        paramMap.put("id",id.toString());
        paramMap.put("flag",flag.toString());
		remoteService.xxMethod(paramMap);	   

每次调用都要做这些类型转换,真的很麻烦,如何能简化点工足量呢?

三.使用extends定制Map

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import java.util.TimeZone;

public class ParamHashMap extends HashMap<String, String> {
    private static final long serialVersionUID = -1277791390393392630L;

    public ParamHashMap() {
    }

    public ParamHashMap(Map<? extends String, ? extends String> m) {
        super(m);
    }

    public String put(String key, Object value) {
        String strValue;
        if (value == null) {
            strValue = null;
        } else if (value instanceof String) {
            strValue = (String)value;
        } else if (value instanceof Integer) {
            strValue = ((Integer)value).toString();
        } else if (value instanceof Long) {
            strValue = ((Long)value).toString();
        } else if (value instanceof Float) {
            strValue = ((Float)value).toString();
        } else if (value instanceof Double) {
            strValue = ((Double)value).toString();
        } else if (value instanceof Boolean) {
            strValue = ((Boolean)value).toString();
        } else if (value instanceof Date) {
            DateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
            format.setTimeZone(TimeZone.getTimeZone("GMT+8"));
            strValue = format.format((Date)value);
        } else {
            strValue = value.toString();
        }
        return this.put(key, strValue);
    }
}