Http通信访问网络资源(Get与Post请求)

来源：互联网发布：社会关系网络问卷编辑：程序博客网时间：2024/06/01 20:04

添加网络访问权限

<uses-permission android:name="android.permission.INTERNET"/>

package com.zdsoft.httpget;import android.os.Handler;import android.os.Message;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.EditText;import android.widget.Toast;import java.io.BufferedInputStream;import java.io.BufferedReader;import java.io.InputStream;import java.io.InputStreamReader;import java.io.OutputStream;import java.io.UnsupportedEncodingException;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import java.net.URLEncoder;public class MainActivity extends AppCompatActivity {    private EditText et_username, et_password;    private Button bt_login;    private String result = "";//服务器返回结果    private String URL_BASE = "http://192.168.12.187:8080/test/servlet/LoginServlet";//接口地址    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initView();        bt_login.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                final Handler handler = new Handler() {                    @Override                    public void handleMessage(Message msg) {                        //更新UI                        if (msg.what == 1) {                            Toast.makeText(MainActivity.this, result, Toast.LENGTH_SHORT).show();                            et_username.setText("");                            et_password.setText("");                        }                    }                };                new Thread() {                    @Override                    public void run() {                        //网络访问，登录                        //get方式                        //loginGet(et_username.getText().toString(), et_password.getText().toString());                        //post方式                        loginPost(et_username.getText().toString(), et_password.getText().toString());                        Message message = new Message();                        message.what = 1;                        handler.sendMessage(message);                    }                }.start();            }        });    }    private void initView() {        et_username = (EditText) findViewById(R.id.et_username);        et_password = (EditText) findViewById(R.id.et_password);        bt_login = (Button) findViewById(R.id.bt_login);    }    /**     * get方式提交     * 用户登录     *     * @param username     * @param password     */    private void loginGet(String username, String password) {        try {            //获取URL对象            URL url = new URL(URL_BASE + "?username=" + URLEncoder.encode(username, "UTF-8") + "&password=" + URLEncoder.encode(password, "UTF-8") + "");            //获取HttpURLConnection            HttpURLConnection connection = (HttpURLConnection) url.openConnection();            connection.setRequestMethod("GET");            //获取输入流            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(connection.getInputStream()));            //读取服务器返回结果            StringBuffer sb = new StringBuffer();            String line = "";            while ((line = bufferedReader.readLine()) != null) {                sb.append(line);            }            result = sb.toString();            //关闭流，断开链接            bufferedReader.close();            connection.disconnect();        } catch (Exception e) {            e.printStackTrace();        }    }    /**     * post方式提交     * 用户登录     *     * @param username     * @param password     */    private void loginPost(String username, String password) {        try {            //获取URL对象            URL url = new URL(URL_BASE);            //获取HttpURLConnection            HttpURLConnection conn = (HttpURLConnection) url.openConnection();            conn.setRequestMethod("POST");            //设置允许输入、输出            conn.setDoInput(true);            conn.setDoOutput(true);            //设置请求的头            conn.setRequestProperty("content-type", "application/x-www-form-urlencoded");            conn.setRequestProperty("charset", "utf-8");            //获取输出流            OutputStream os = conn.getOutputStream();            String date = "username=" + URLEncoder.encode(username, "UTF-8") + "&password=" + URLEncoder.encode(password, "UTF-8") + "";            os.write(date.getBytes());            os.flush();            //获取BufferedReader，读取服务器返回信息            BufferedReader br = new BufferedReader(new InputStreamReader(conn.getInputStream()));            String line = "";            StringBuffer sb = new StringBuffer();            while ((line = br.readLine()) != null) {                sb.append(line);            }            result = sb.toString();            //关闭流，断开链接            os.close();            conn.disconnect();        } catch (Exception e) {            e.printStackTrace();        }    }}

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