写在前面

该博客紧接上篇博客:https://www.cnblogs.com/wushenjiang/p/12937531.html,继续学习post请求,带参数的post和get请求以及文件上传与下载

post请求

其实post请求的方式与get请求差不太多,我们还是先上代码:

    public void postRequest(View v) {
new Thread(new Runnable() {
@Override
public void run() {
OutputStream outputStream = null;
InputStream inputStream = null;
try {
URL url = new URL(BASE_URL + "/post/comment");
HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
httpURLConnection.setRequestMethod("POST");
httpURLConnection.setConnectTimeout(10000);
httpURLConnection.setRequestProperty("Content-Type", "application/json;charset=UTF-8");
httpURLConnection.setRequestProperty("Accept-Language", "zh-CN,zh;q=0.9");
httpURLConnection.setRequestProperty("Accept", "application/json,text/plain,*/*"); CommentItem commentItem = new CommentItem("234134123", "我是评论内容...哈哈");
Gson gson = new Gson();
String jsonStr = gson.toJson(commentItem);
byte[] bytes = jsonStr.getBytes("UTF-8");
Log.d(TAG, "bytes==>" + bytes.length);
httpURLConnection.setRequestProperty("Content-Length", String.valueOf(bytes.length));
//连接
httpURLConnection.connect();
//把数据给到服务器
outputStream = httpURLConnection.getOutputStream();
outputStream.write(bytes);
outputStream.flush();
//拿到结果
int responseCode = httpURLConnection.getResponseCode();
if (responseCode == HttpURLConnection.HTTP_OK) {
inputStream = httpURLConnection.getInputStream();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
Log.d(TAG, "result ==>" + bufferedReader.readLine());
}
} catch (Exception e) {
e.printStackTrace();
} finally {
if (outputStream != null) {
try {
outputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (inputStream != null) {
try {
inputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}).start();
}

可以看到,与get请求不同的一点就是我们需要添加一个内容,然后把数据写入到服务端,最后关闭所有的流。整体的流程和get基本一致。

带参数的post和get请求

这里其实很类似,我们直接写一个方法统一起来:

 private void startRequest(final Map<String, String> params, final String method, final String api) {
new Thread(new Runnable() {
BufferedReader bufferedReader = null; @Override
public void run() {
StringBuilder sb = new StringBuilder("?");
try {
//组装参数
if (params != null && params.size() > 0) {
Iterator<Map.Entry<String, String>> iterator = params.entrySet().iterator();
while (iterator.hasNext()) {
Map.Entry<String, String> next = iterator.next();
sb.append(next.getKey());
sb.append("=");
sb.append(next.getValue());
if (iterator.hasNext()) {
sb.append("&");
}
}
Log.d(TAG, "sb result -->" + sb.toString());
}
URL url;
String paramsStr = sb.toString();
if (paramsStr != null && paramsStr.length() > 0) {
url = new URL(BASE_URL + api + paramsStr);
} else {
url = new URL(BASE_URL + api);
}
Log.d(TAG, "url ==>" + url.toString());
HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
httpURLConnection.setRequestMethod(method);
httpURLConnection.setRequestProperty("Accept-Language", "zh-CN,zh;q=0.9");
httpURLConnection.setRequestProperty("Accept", "*/*");
httpURLConnection.connect();
int responseCode;
responseCode = httpURLConnection.getResponseCode();
if (responseCode == HttpURLConnection.HTTP_OK) {
InputStream inputStream = httpURLConnection.getInputStream();
bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
String json = bufferedReader.readLine();
Log.d(TAG, "result ==>" + json);
} } catch (Exception e) {
e.printStackTrace();
} finally {
if (bufferedReader != null) {
try {
bufferedReader.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}).start();
}

可以看到,我们主要就是需要将url进行一个字符串拼接,我们使用StringBuilder来进行字符串拼接,要更为安全。具体的操作流程请见代码,不用多说了。

文件上传

我们要做文件上传,其实很简单。先来上代码:

  public void postFiles(View v) {
new Thread(new Runnable() {
OutputStream outputStream = null;
InputStream inputStream = null; @Override
public void run() {
try {
File fileOne = new File("/storage/emulated/0/Download/shop-ad.png");
File fileTwo = new File("/storage/emulated/0/Download/rBsADV64HDWAI6i_AAhJfxL8eXE287.png");
File fileThree = new File("/storage/emulated/0/Download/rBsADV64ILeAfwQMAAdBpy-0H04021.png");
String fileKey = "files";
String fileType = "image/png";
String BOUNDARY = "--------------------------246140106706876087289187";
// String BOUNDARY = "----------------------------246140106706876087289187";
URL url = new URL(BASE_URL + "/files/upload");
HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
httpURLConnection.setRequestMethod("POST");
httpURLConnection.setConnectTimeout(10000);
httpURLConnection.setRequestProperty("User-Agent", "Android/" + Build.VERSION.SDK_INT);
httpURLConnection.setRequestProperty("Accept", "*/*");
httpURLConnection.setRequestProperty("Cache-Control", "no-cache");
httpURLConnection.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + BOUNDARY);
httpURLConnection.setRequestProperty("Connection", "keep-alive");
httpURLConnection.setDoOutput(true);
httpURLConnection.setDoInput(true);
//连接
httpURLConnection.connect();
outputStream = httpURLConnection.getOutputStream();
uploadFile(fileOne, fileKey, fileOne.getName(), fileType, BOUNDARY, outputStream, false);
uploadFile(fileTwo, fileKey, fileTwo.getName(), fileType, BOUNDARY, outputStream, false);
uploadFile(fileThree, fileKey, fileThree.getName(), fileType, BOUNDARY, outputStream, true);
outputStream.flush();
//获取返回结果
int responseCode = httpURLConnection.getResponseCode();
Log.d(TAG, "responseCode ==>" + responseCode);
if (responseCode == HttpURLConnection.HTTP_OK) {
inputStream = httpURLConnection.getInputStream();
BufferedReader bf = new BufferedReader(new InputStreamReader(inputStream));
String result = bf.readLine();
Log.d(TAG, "result ==>" + result);
} } catch (Exception e) {
e.printStackTrace();
} finally {
// if (bfi != null) {
// try {
// bfi.close();
// } catch (IOException e) {
// e.printStackTrace();
// }
// }
if (outputStream != null) {
try {
outputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (inputStream != null) {
try {
inputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
} private void uploadFile(File file,
String fileKey,
String fileName,
String fileType,
String BOUNDARY,
OutputStream outputStream,
boolean isLast) throws IOException {
//准备数据
StringBuilder headerSbInfo = new StringBuilder();
headerSbInfo.append("--");
headerSbInfo.append(BOUNDARY);
headerSbInfo.append("\r\n");
headerSbInfo.append("Content-Disposition: form-data; name=\"" + fileKey + "\"; filename=\"" + fileName + "\"");
headerSbInfo.append("\r\n");
headerSbInfo.append("Content-Type:" + fileType);
headerSbInfo.append("\r\n");
headerSbInfo.append("\r\n");
byte[] headerInfoBytes = headerSbInfo.toString().getBytes("UTF-8");
outputStream.write(headerInfoBytes);
//文件内容
FileInputStream fos = new FileInputStream(file);
BufferedInputStream bfi = new BufferedInputStream(fos);
byte[] buffer = new byte[1024];
int len;
while ((len = bfi.read(buffer, 0, buffer.length)) != -1) {
outputStream.write(buffer, 0, len);
}
//写尾部信息
StringBuilder footerSbInfo = new StringBuilder();
footerSbInfo.append("\r\n");
footerSbInfo.append("--");
footerSbInfo.append(BOUNDARY);
if (isLast) {
footerSbInfo.append("--");
footerSbInfo.append("\r\n");
}
footerSbInfo.append("\r\n");
outputStream.write(footerSbInfo.toString().getBytes("UTF-8"));
}
}).start();
}

仔细看,其实有点复杂。这里解释一下:

首先我们要先设置把本地的一张图设置为File类,而后设置连接的参数。之后是上传的方法 可以看到,我们上传文件的方法也是一个字符串拼接,不过拼接的是一种固定格式,我们需要按照规定的格式拼接好才能让我们的服务器识别并上传。之后将图片转换成二进制文件进行读取,之后再拼接尾部格式。之后便是返回结果了。我们通过返回结果来看看是否上传成功,之后在自己的文件夹下看看是否有文件即可。

文件下载

和上传文件相比,下载文件就没有那么复杂了,如下代码:

   public void downloadFile(View v) {
new Thread(new Runnable() {
FileOutputStream fileOutputStream = null;
InputStream inputStream = null;
@Override
public void run() {
try {
URL url = new URL(BASE_URL + "/download/10");
HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
httpURLConnection.setConnectTimeout(10000);
httpURLConnection.setRequestMethod("GET");
httpURLConnection.setRequestProperty("Accept-Language", "zh-CN,zh;q=0.9");
httpURLConnection.setRequestProperty("Accept", "*/*");
httpURLConnection.connect();
int responseCode = httpURLConnection.getResponseCode();
Log.d(TAG,"responseCode ==>"+responseCode);
if (responseCode == HttpURLConnection.HTTP_OK) {
Map<String, List<String>> headerFields = httpURLConnection.getHeaderFields();
for (Map.Entry<String, List<String>> stringListEntry : headerFields.entrySet()) {
Log.d(TAG,stringListEntry.getKey() +"==="+stringListEntry.getValue());
}
String headerField = httpURLConnection.getHeaderField("Content-disposition");
Log.d(TAG,"headerField -->"+headerField);
// int index = headerField.indexOf("filename=");
// String fileName = headerField.substring(index + "filename=".length());
// Log.d(TAG,"fileName ==>"+fileName);
String fileName = headerField.replace("attachment; filename=", "");
Log.d(TAG,"fileName ==>"+fileName);
File picFile = RequestTestActivity.this.getExternalFilesDir(Environment.DIRECTORY_PICTURES);
if (!picFile.exists()) {
picFile.mkdirs();
}
File file = new File(picFile+fileName);
if(!file.exists()){
file.createNewFile();
} fileOutputStream = new FileOutputStream(file);
inputStream = httpURLConnection.getInputStream();
byte[] buffer = new byte[1024];
int len;
while((len = inputStream.read(buffer,0,buffer.length)) != -1){
fileOutputStream.write(buffer,0,len);
}
fileOutputStream.flush(); }
} catch (Exception e) {
e.printStackTrace();
}finally {
if (inputStream != null) {
IOUtils.ioClose(inputStream);
}
if (fileOutputStream != null) {
IOUtils.ioClose(fileOutputStream);
}
}
}
}).start();
}

我们从服务器请求回文件,然后获取路径,新建文件和路径,然后存储进去即可。

总结

使用java API的编程操作到这里就先告一段落了,可以看到通过原生API编程的不易啊,后面我们马上学习框架使用和线程管理,就更能体会到框架的好处了。

安卓网络编程学习(1)——java原生网络编程(2)的更多相关文章

  1. 安卓网络编程学习(1)——java原生网络编程(1)

    写在前面 马上要进行第二轮冲刺,考虑到自己的APP在第一轮冲刺的效果不尽人意,有很多网络方面的小BUG,这里就系统学习一下网络编程,了解来龙去脉,以便更好的对项目进行优化处理. http协议 http ...

  2. 转 网络编程学习笔记一:Socket编程

    题外话 前几天和朋友聊天,朋友问我怎么最近不写博客了,一个是因为最近在忙着公司使用的一些控件的开发,浏览器兼容性搞死人:但主要是因为这段时间一直在看html5的东西,看到web socket时觉得很有 ...

  3. Java 原生网络编程.

    一.概念 Java 语言从其诞生开始,就和网络紧密联系在一起.在 1995 年的 Sun World 大会上,当时占浏览器市场份额绝对领先的网景公司宣布在浏览器中支持Java,从而引起一系列的公司产品 ...

  4. Java原生网络编程

    一些常见术语 编程中的Socket是应用层与TCP/IP协议族通信的中间软件抽象层,它是一组接口.在设计模式中,Socket其实就是一个门面模式,它把复杂的TCP/IP协议族隐藏在Socket接口后面 ...

  5. 网络编程学习笔记一:Socket编程

    “一切皆Socket!” 话虽些许夸张,但是事实也是,现在的网络编程几乎都是用的socket. ——有感于实际编程和开源项目研究. 我们深谙信息交流的价值,那网络中进程之间如何通信,如我们每天打开浏览 ...

  6. 网络编程学习笔记-全零网络IP地址0.0.0.0详谈

    RFC: - Addresses in this block refer to source hosts on "this" network. Address may be use ...

  7. JAVA学习篇--JAVA两种编程模式控制

    在Drp项目中,解说了两种编程模式Model 1和Model2.以下是对这两种模式的简单理解.以及因为Model2是基于MVC架构的模式,就将我们易混淆的MVC与我们之前学的三层架构进行对照学习一下. ...

  8. 多线程编程学习一(Java多线程的基础).

    一.进程和线程的概念 进程:一次程序的执行称为一个进程,每个 进程有独立的代码和数据空间,进程间切换的开销比较大,一个进程包含1—n个线程.进程是资源分享的最小单位. 线程:同一类线程共享代码和数据空 ...

  9. 多线程编程学习六(Java 中的阻塞队列).

    介绍 阻塞队列(BlockingQueue)是指当队列满时,队列会阻塞插入元素的线程,直到队列不满:当队列空时,队列会阻塞获得元素的线程,直到队列变非空.阻塞队列就是生产者用来存放元素.消费者用来获取 ...

随机推荐

  1. Spring5参考指南:SpringAOP简介

    文章目录 AOP的概念 Spring AOP简介 Spring AOP通知类型 写过程序的都知道OOP即面向对象编程. 从最开始的面向过程编程,到后面的面向对象编程,程序的编写方式发生了重大的变化,面 ...

  2. SpringBoot 集成Swagger2自动生成文档和导出成静态文件

    目录 1. 简介 2. 集成Swagger2 2.1 导入Swagger库 2.2 配置Swagger基本信息 2.3 使用Swagger注解 2.4 文档效果图 3. 常用注解介绍 4. Swagg ...

  3. java 之 abstract、interface

    abstract (抽象) 用abstract关键字来修饰一个类时,这个类叫做抽象类: 用abstract来修饰一个方法时,该方法叫做抽象方法. 抽象方法:只有方法的声明,没有方法的实现.以分号结束: ...

  4. SpringBoot系列(十二)过滤器配置详解

    SpringBoot(十二)过滤器详解 往期精彩推荐 SpringBoot系列(一)idea新建Springboot项目 SpringBoot系列(二)入门知识 springBoot系列(三)配置文件 ...

  5. QQ网站的源代码

    链接:https://pan.baidu.com/s/1mqetTbauKTI0KJOaU8wW5A 提取码请加QQ:2669803073获取 声明:仅供学习,切勿用于其他用途

  6. 华硕笔记本无法U盘启动,快捷键识别不了

    http://www.udaxia.com/upqd/8254.html 转载于:https://www.cnblogs.com/wanglinjie/p/10507888.html

  7. Nodejs的介绍

    Nodejs的介绍 Node.js的是建立在Chrome的JavaScript的运行时,可方便地构建快速,可扩展的网络应用程序的平台.Node.js使用事件驱动,非阻塞I/O模型,轻量.高效,可以完美 ...

  8. Omnicore RPC API中文文档

    2019独角兽企业重金招聘Python工程师标准>>> OmniCore是比特币核心的一个分支,它在比特币协议之上实现了一个新的Omni协议层,用于代币发行.众售等应用,USDT就是 ...

  9. XmlSerializer .NET 序列化、反序列化

    序列化对象   要序列化对象,首先创建要序列化的对象并设置其公共属性和字段.为此,您必须确定要将XML流存储的传输格式,作为流或文件. 例如,如果XML流必须以永久形式保存,则创建一个FileStre ...

  10. Ubuntu+FastDFS+Nginx

    一.安装libfastcommon 1.wget https://github.com/happyfish100/libfastcommon/archive/V1.0.7.tar.gz 2.tar - ...