HttpClient请求第三方接口下载文件导致文件损坏的问题解决方法

首先看一下 请求JSON数据的方法

public static String getJson(String url, Map<String,String> paramMap){
        // 创建Httpclient对象
        CloseableHttpClient httpClient = HttpClients.createDefault();

        String result = "";
        CloseableHttpResponse response = null;

        try{
            URIBuilder builder = new URIBuilder(url);
            if(paramMap != null){
                for (String key : paramMap.keySet()) {
                    builder.addParameter(key,paramMap.get(key));
                }
            }
            URI uri = builder.build();

            //创建GET请求
            HttpGet httpGet = new HttpGet(uri);

            //发送请求
            response = httpClient.execute(httpGet);

            //判断响应状态
            if(response.getStatusLine().getStatusCode() == 200){
                result = EntityUtils.toString(response.getEntity(),"UTF-8");
            }
        }catch (Exception e){
            e.printStackTrace();
        }finally {
            try {
                response.close();
                httpClient.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        return result;
    }

如果请求文件流使用String类型返回，文件会损坏。之前 我请求第三方接口 导致了文件下载损坏

所以如果要请求返回文件流的第三方接口 具体请求方法如下：

public static byte[] getFile(String url, Map<String,String> paramMap){
        // 创建Httpclient对象
        CloseableHttpClient httpClient = HttpClients.createDefault();

        HttpEntity result = null;
        byte[] data = null;
        CloseableHttpResponse response = null;

        try{
            URIBuilder builder = new URIBuilder(url);
            if(paramMap != null){
                for (String key : paramMap.keySet()) {
                    builder.addParameter(key,paramMap.get(key));
                }
            }
            URI uri = builder.build();

            //创建GET请求
            HttpGet httpGet = new HttpGet(uri);

            //发送请求
            response = httpClient.execute(httpGet);

            //判断响应状态
            if(response.getStatusLine().getStatusCode() == 200){
                result = response.getEntity();
                data = EntityUtils.toByteArray(result);
            }
        }catch (Exception e){
            e.printStackTrace();
        }finally {
            try {
                response.close();
                httpClient.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        return data;
    }

具体看一下

首先获取响应实体

result = response.getEntity();

然后将获取的响应实体转为字节类型

data = EntityUtils.toByteArray(result);

最后返回文件流

return data;

以上就是我总结的请求第三方接口的文件流方法，请大佬们指正！