接口开发 -签名方式：对请求的参数名进行按字母排序 实现及优化

一般的实现方式:

 // 构建签名
TreeMap<String, Object> signParams = new TreeMap<>();
params.put("mobile", "123");
HashMap<String, Object> params = new HashMap<>();
params.put("sign", SignUtil.signByMap(privateKey, signParams));

TreeMap分析:

TreeMap默认排序规则:按照key的字典顺序来排序(升序),和字段放入的前后没有关系

测试:

public static void main(String[] args) {
        Map<String,Object> params = new TreeMap<>();
        params.put("b1","b1");
        params.put("a1","c1");
        params.put("c1","c1");
        System.out.println(params);
}

{a1=c1, b1=b1, c1=c1}

使用方法,通过反射的方式根据实体类属性值创建TreeMap对象

public static TreeMap<String, Object> parseTreeMap(Object model) throws Exception {
  TreeMap<String, Object> param = new TreeMap<String, Object>();
  Field[] field = model.getClass().getDeclaredFields();
  for (int j = 0; j < field.length; j++) {
    String name = field[j].getName();
    // 将属性的首字符大写，方便构造get，set方法
    name = name.substring(0, 1).toUpperCase() + name.substring(1);
    String type = field[j].getGenericType().toString();
    if ("class java.lang.String".equals(type)) {
      Method m = model.getClass().getMethod("get" + name);
      String value = (String) m.invoke(model);
      if (!StringUtils.isEmpty(value)) {
        param.put(name, value);
      } 
    }
    if ("class java.lang.Integer".equals(type)) {
      Method m = model.getClass().getMethod("get" + name);
      Integer value = (Integer) m.invoke(model);
      if (value != null) {
        param.put(name, value);
      } 
    }
    if ("class java.lang.Short".equals(type)) {
      Method m = model.getClass().getMethod("get" + name);
      Short value = (Short) m.invoke(model);
      if (value != null) {
        param.put(name, value);
      } 
    }
    if ("class java.lang.Double".equals(type)) {
      Method m = model.getClass().getMethod("get" + name);
      Double value = (Double) m.invoke(model);
      if (value != null) {
        param.put(name, value);
      } 
    }
    if ("class java.lang.Boolean".equals(type)) {
      Method m = model.getClass().getMethod("get" + name);
      Boolean value = (Boolean) m.invoke(model);
      if (value != null) {
        param.put(name, value);
      } 
    }
    if ("class java.util.Date".equals(type)) {
      Method m = model.getClass().getMethod("get" + name);
      Date value = (Date) m.invoke(model);
      if (value != null) {
        param.put(name, value);
      } 
    }
  }
  return param;
}

TreeMap<String, Object> signParams = ClassUtil.parseTreeMap(vo)

end