httpclient 上传、下载文件，美团Android研发岗二面

2024-04-13 11:30:03

// 把一个普通参数和文件上传给下面这个地址是一个servlet
HttpPost httpPost = new HttpPost(
“http://localhost:8080/xxx/xxx.action”);
// 把文件转换成流对象FileBody
File file = new File(filePath);
FileBody bin = new FileBody(file);
StringBody uploadFileName = new StringBody(
“把我修改成文件名称”, ContentType.create(
“text/plain”, Consts.UTF_8));
//以浏览器兼容模式运行，防止文件名乱码。
HttpEntity reqEntity = MultipartEntityBuilder.create().setMode(HttpMultipartMode.BROWSER_COMPATIBLE)
.addPart(“uploadFile”, bin) //uploadFile对应服务端类的同名属性<File类型>
.addPart(“uploadFileName”, uploadFileName)//uploadFileName对应服务端类的同名属性<String类型>
.setCharset(CharsetUtils.get(“UTF-8”)).build();
httpPost.setEntity(reqEntity);
System.out.println("发起请求的页面地址 " + httpPost.getRequestLine());
// 发起请求并返回请求的响应
CloseableHttpResponse response = httpClient.execute(httpPost);
try {
System.out.println("----------------------------------------");
// 打印响应状态
System.out.println(response.getStatusLine());
// 获取响应对象
HttpEntity resEntity = response.getEntity();
if (resEntity != null) {
// 打印响应长度

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System.out.println("Response content length: "

+ resEntity.getContentLength());
// 打印响应内容
System.out.println(EntityUtils.toString(resEntity,
Charset.forName(“UTF-8”)));
}
// 销毁
EntityUtils.consume(resEntity);
} finally {
response.close();
}
} finally {
httpClient.close();
}
}
/**
* 下载文件
* @param url http://www.xxx.com/img/333.jpg
* @param destFileName xxx.jpg/xxx.png/xxx.txt
* @throws ClientProtocolException
* @throws IOException
*/
public static void getFile(String url, String destFileName)
throws ClientProtocolException, IOException {
// 生成一个httpclient对象
CloseableHttpClient httpclient = HttpClients.createDefault();
HttpGet httpget = new HttpGet(url);
HttpResponse response = httpclient.execute(httpget);
HttpEntity entity = response.getEntity();
InputStream in = entity.getContent();
File file = new File(destFileName);
try {
FileOutputStream fout = new FileOutputStream(file);