post 请求:
package com.example.administrator.eschool; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.support.v7.app.AppCompatActivity; import android.text.TextUtils; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.TextView; import android.widget.Toast; import java.io.ByteArrayOutputStream; import java.io.InputStream; import java.io.OutputStream; import java.io.OutputStreamWriter; import java.io.PrintWriter; import java.net.HttpURLConnection; import java.net.URL; public class MainActivity extends AppCompatActivity implements View.OnClickListener { private EditText username; private EditText password; private Button login; private Handler mHandler = new Handler() { @Override public void handleMessage(Message msg) { super.handleMessage(msg); textView.setText(msg.obj.toString()); } }; private TextView textView; private String text = ""; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initView(); } private void initView() { username = (EditText) findViewById(R.id.username); password = (EditText) findViewById(R.id.password); login = (Button) findViewById(R.id.login); login.setOnClickListener(this); textView = (TextView) findViewById(R.id.textView); textView.setOnClickListener(this); } @Override public void onClick(View v) { switch (v.getId()) { case R.id.login: submit(); break; } } private void submit() { // validate final String usernameString = username.getText().toString().trim(); if (TextUtils.isEmpty(usernameString)) { Toast.makeText(this, "请输入您的用户名", Toast.LENGTH_SHORT).show(); return; } final String passwordString = password.getText().toString().trim(); if (TextUtils.isEmpty(passwordString)) { Toast.makeText(this, "请输入您的密码", Toast.LENGTH_SHORT).show(); return; } // TODO validate success, do something new Thread(new Runnable() { @Override public void run() { try { HttpURLConnection conn = (HttpURLConnection) new URL("http://192.168.1.107:8000/iphone_api/login.html").openConnection(); conn.setRequestMethod("POST"); conn.setConnectTimeout(5000); conn.setDoOutput(true); conn.setDoInput(true); StringBuffer params = new StringBuffer(); // 表单参数与get形式一样 params.append("uid").append("=").append(usernameString).append("&") .append("pwd").append("=").append(passwordString); byte[] bypes = params.toString().getBytes(); conn.getOutputStream().write(bypes);// 输入参数 int code = conn.getResponseCode(); if (code == 200) { InputStream is = conn.getInputStream(); ByteArrayOutputStream baos = new ByteArrayOutputStream(); byte[] buffer = new byte[1024]; int len = 0; while ((len = is.read(buffer)) != -1) { baos.write(buffer, 0, len); } is.close(); text = new String(baos.toByteArray(), "utf-8"); Message m = new Message(); m.obj = text; mHandler.sendMessage(m); } } catch (Exception e) { e.printStackTrace(); } } }).start(); } }