Retrofit 使用过程中遇到的坑

1.  添加本地缓存时，post 方式的请求不缓存。

2. @Body 方式提交数据时，会转成 json 形式提交， 而不是键值对。

自定义 GsonConverterFactory ,主要是 GsonRequestBodyConverter 类。

final class GsonRequestBodyConverter<T> implements Converter<T, RequestBody> {  private static final MediaType MEDIA_TYPE = MediaType.parse("application/json; charset=UTF-8");  private static final Charset UTF_8 = Charset.forName("UTF-8");

private final Gson gson;  private final TypeAdapter<T> adapter;

GsonRequestBodyConverter(Gson gson, TypeAdapter<T> adapter) {    this.gson = gson;    this.adapter = adapter;  }

@Override public RequestBody convert(T value) throws IOException {    Buffer buffer = new Buffer();    buffer.read(UrlFormedUtils.getFormUrlEncoded(value).getBytes());    return RequestBody.create(MEDIA_TYPE, buffer.readByteString());  }}

// 把对象转为url 键值对。

public static <T> String getFormUrlEncoded(T t){    String cls1 = t.getClass().getName();    StringBuffer sb = new StringBuffer();    try {        Class<?> cls = Class.forName(cls1);        Field[] fields = cls.getDeclaredFields();        for(Field field:fields){            if (field.isSynthetic()) {                continue;            }            if (field.getName().equals("serialVersionUID")) {                continue;            }            field.setAccessible(true);            if(field.get(t)!=null && !TextUtils.isEmpty(field.get(t).toString())){                sb.append("&").append(field.getName()).append("=").append(field.get(t));            }        }        Class<?> superCls = cls.getSuperclass();        if(!superCls.getSimpleName().equals("Object")){            fields = superCls.getDeclaredFields();            for(Field field:fields){                if (field.isSynthetic()) {                    continue;                }                if (field.getName().equals("serialVersionUID")) {                    continue;                }                field.setAccessible(true);                if(field.get(t)!=null  && !TextUtils.isEmpty(field.get(t).toString())){                    sb.append("&").append(field.getName()).append("=").append(field.get(t));                }            }        }        return sb.toString();    } catch (Exception e) {        e.printStackTrace();    }    return "";}