使用HttpPost请求方式调用服务器

来源：互联网发布：js判断输入框是否为空编辑：程序博客网时间：2024/05/16 08:25
MainActivity中：
package com.zhidi.httppost;import java.io.BufferedReader;import java.io.InputStreamReader;import java.io.OutputStream;import java.net.HttpURLConnection;import java.net.URL;import java.net.URLEncoder;import android.app.Activity;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.Toast;public class MainActivity extends Activity {    private EditText et_username;    private EditText et_password;    private Button bt_show;    String result="";    /**post请求URL地址*/    private static final String URL="http://192.168.2.3:8080/test/servlet/LoginServlet";    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        init();        bt_show.setOnClickListener(new OnClickListener() {            @Override            public void onClick(View arg0) {                //android4.0后的新的特性，网络数据请求时不能放在主线程中。                //9、使用线程执行访问服务器，获取返回信息后通知主线程更新UI或者提示信息。                final Handler handler = new Handler() {                    @Override                      public void handleMessage(Message msg) {                          if (msg.what == 1) {                            //8、提示读取结果                            Toast.makeText(MainActivity.this, result, Toast.LENGTH_LONG).show();                        }                      }                  };                // 启动线程来执行任务                  new Thread() {                      public void run() {                        //请求网络                        loginByPost(et_username.getText().toString(), et_password.getText().toString());                         Message m = new Message();                          m.what = 1;                          // 发送消息到Handler                          handler.sendMessage(m);                      }                  }.start();            }        });    }    private void init(){        et_username=(EditText)findViewById(R.id.et_username);        et_password=(EditText)findViewById(R.id.et_password);        bt_show=(Button)findViewById(R.id.bt_login);    }    /**     * 请求后台，判断登录结果。     * @param username     * @param password     */    public void loginByPost(String username, String password) {          try {             //1、根据地址创建URL对象(网络访问的url)              URL url = new URL(URL);              //2、url.openConnection()打开网络链接              HttpURLConnection conn = (HttpURLConnection)url.openConnection();              //3、设置请求的方式              conn.setRequestMethod("POST");             conn.setDoInput(true);//发送POST请求必须设置允许输出            conn.setDoOutput(true);//发送POST请求必须设置允许输入            //4、设置请求的头            conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");            conn.setRequestProperty("Charset", "utf-8");            String data = "username=" + URLEncoder.encode(username, "UTF-8")                      + "&password=" + URLEncoder.encode(password, "UTF-8");//传递的数据            conn.setRequestProperty("Content-Length",String.valueOf(data.getBytes().length));             //5、获取输出流             OutputStream os = conn.getOutputStream();              os.write(data.getBytes());              os.flush();             //6、获取响应的输入流对象            InputStreamReader is = new InputStreamReader(conn.getInputStream());            BufferedReader bufferedReader = new BufferedReader(is);            StringBuffer strBuffer = new StringBuffer();            String line = null;            //7、读取服务器返回信息            while ((line = bufferedReader.readLine()) != null) {                strBuffer.append(line);            }            result = strBuffer.toString();            //8、关闭InputStream、关闭http连接            is.close();            conn.disconnect();        } catch (Exception e) {              e.printStackTrace();          }      }}
AndroidManifest中注册网络权限
<uses-permission android:name="android.permission.INTERNET"/>
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