Android学习（50） -- 使用post方式提交数据

来源：互联网发布：web项目怎么管理网络编辑：程序博客网时间：2024/06/10 17:31

要点

post提交数据是用流写给服务器的

协议头中多了两个属性

Content-Type: application/x-www-form-urlencoded，描述提交的数据的mimetype

Content-Length: 30，描述提交的数据的长度

//给请求头添加post多出来的两个属性String data = "name=" + URLEncoder.encode(name) + "&pass=" + pass;conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");conn.setRequestProperty("Content-Length", data.length() + "");

设置允许打开post请求的流

conn.setDoOutput(true);

获取连接对象的输出流，往流里写要提交给服务器的数据

OutputStream os = conn.getOutputStream();os.write(data.getBytes());

核心代码

public class MainActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);}Handler handler = new Handler(){public void handleMessage(android.os.Message msg) {Toast.makeText(MainActivity.this, (String)msg.obj, 0).show();}};public void click(View v){EditText et_name = (EditText) findViewById(R.id.et_name);EditText et_pass = (EditText) findViewById(R.id.et_pass);final String name = et_name.getText().toString();final String pass = et_pass.getText().toString();Thread t = new Thread(){@Overridepublic void run() {//提交的数据需要经过url编码，英文和数字编码后不变@SuppressWarnings("deprecation")String path = "http://192.168.13.13/Web2/servlet/LoginServlet";try {URL url = new URL(path);HttpURLConnection conn = (HttpURLConnection) url.openConnection();conn.setRequestMethod("POST");conn.setConnectTimeout(5000);conn.setReadTimeout(5000);//拼接出要提交的数据的字符串String data = "name=" + URLEncoder.encode(name) + "&pass=" + pass;//添加post请求的两行属性conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");conn.setRequestProperty("Content-Length", data.length() + "");//设置打开输出流conn.setDoOutput(true);//拿到输出流OutputStream os = conn.getOutputStream();//使用输出流往服务器提交数据os.write(data.getBytes());if(conn.getResponseCode() == 200){InputStream is = conn.getInputStream();String text = Utils.getTextFromStream(is);Message msg = handler.obtainMessage();msg.obj = text;handler.sendMessage(msg);}} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}}};t.start();}}

getTextFromStream

public static String getTextFromStream(InputStream is){byte[] b = new byte[1024];int len = 0;//创建字节数组输出流，读取输入流的文本数据时，同步把数据写入数组输出流ByteArrayOutputStream bos = new ByteArrayOutputStream();try {while((len = is.read(b)) != -1){bos.write(b, 0, len);}//把字节数组输出流里的数据转换成字节数组String text = new String(bos.toByteArray());return text;} catch (IOException e) {e.printStackTrace();}return null;}

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