[移动开发]【Android】okHttp处理session过期情况

自定义拦截器，实现 intercept 方法

@Override
public Response intercept(Chain chain) throws IOException {
		Request originalReq = chain.request();
        Response originalResp = chain.proceed(originalReq);
        ResponseBody body = originalResp.body();
        MediaType mediaType = body.contentType();
        String str = body.string();
        // 判断是否登录过期
        JSONObject json = JSONObject.parseObject(str);
        if (HttpUtil.checkErrorCode(ErrorEnum.LOGIN_EXPIRED, json.getString("errorCode"))) {
            originalResp.body().close();
            Request loginRequest = getLoginRequest();
            Response loginResponse = chain.proceed(loginRequest);
            // 如果登录成功再重新发送原来的请求
            if (loginResponse.isSuccessful()) {
                List<String> cookies = loginResponse.headers("set-cookie");
                if (!cookies.isEmpty()) {
                    String cookie = CookieUtil.encodeCookie(cookies);
                    CookieUtil.saveCookie(loginRequest.url().toString(), loginRequest.url().host(), cookie);
                }
                loginResponse.body().close();
                return chain.proceed(originalReq);
            }
        }
        // 重建原来的响应
        return originalResp.newBuilder()
                .body(ResponseBody.create(mediaType, str))
                .build();
}

// 获取登录的request    
private Request getLoginRequest() {
	return new Request.Builder()
                .url("登录api地址")
                .post(new FormBody.Builder()
                        .add("username", "用户名")
                        .add("password", "密码")
                        .build())
                .build();
}