原来一个Json接口请求可以这么写

1.最糟糕的写法 version1.0

    HashMap<String, String> level1 = new HashMap<String, String>();
    ("source", "source");
    ("code", "code");
    ("password", "password");
    HashMap<String, String> level2 = new HashMap<String, String>();
    ("getBusinessLevelTokenReq", ());
    HashMap<String, String> datas = new HashMap<String, String>();
    ("params", ());
    System.out.println(datas);

{params={getBusinessLevelTokenReq={password=password, code=code, source=source}}}

缺点：
1.此方法比较依赖对方的解析能力
2.所有类型都当作String
3.硬编码太多

2.一般的写法 version2.0

    HashMap<String, Object> level1 = new HashMap<String, Object>();
    ("source", "source");
    ("code", "code");
    ("password", "password");
    HashMap<String, Object> level2 = new HashMap<String, Object>();
    ("getBusinessLevelTokenReq", level1);
    HashMap<String, String> datas = new HashMap<String, String>();
    ObjectMapper om = new ObjectMapper();
    String data = (level2);
    ("params", data);
    (datas);

{params={"getBusinessLevelTokenReq":{"password":"password","code":"code","source":"source"}}}

这是一种标准的json串，所以理论上不存在解析问题
类型不是单一的String了
硬编码太多

3.比较完美的写法 version 3.0

    TokenReqBean TokenReqBean=new TokenReqBean();
    TokenReqBean.getBusinessLevelTokenReq req =TokenReqBean.new getBusinessLevelTokenReq();
    req.setCode("code");
    req.setPassword("password");
    req.setSource("source");
    HashMap<String, String> datas = new HashMap<String, String>();
    ObjectMapper om = new ObjectMapper();
    String data = om.writeValueAsString(req);
    datas.put("params", data);
    System.out.println(datas);

public class TokenReqBean {
    private Object getBusinessLevelTokenReq;

    public Object getGetBusinessLevelTokenReq() {
        return getBusinessLevelTokenReq;
    }

    public void setGetBusinessLevelTokenReq(Object getBusinessLevelTokenReq) {
        this.getBusinessLevelTokenReq = getBusinessLevelTokenReq;
    }

    public class getBusinessLevelTokenReq{
        private String source;
        private String code;
        private String password;
        public String getSource() {
            return source;
        }
        public void setSource(String source) {
            this.source = source;
        }
        public String getCode() {
            return code;
        }
        public void setCode(String code) {
            this.code = code;
        }
        public String getPassword() {
            return password;
        }
        public void setPassword(String password) {
            this.password = password;
        }
        @Override
        public String toString() {
            return "getBusinessLevelTokenReq [source=" + source + ", code=" + code + ", password=" + password + "]";
        }

    }

    @Override
    public String toString() {
        return "TokenReqBean [getBusinessLevelTokenReq=" + getBusinessLevelTokenReq + "]";
    }

}

{params={"getBusinessLevelTokenReq":{"password":"password","code":"code","source":"source"}}}

相对于前面两种写法来说，这样的写法就非常的优雅了

记一次项目开发的重构经历