HttpURLConnection

来源：互联网发布：winsteel软件下载编辑：程序博客网时间：2024/06/06 05:30

请求头（get，post）
响应头（200 成功）–content-type（jpeg）mime—-content-length———服务端开发人员给我们的
响应正文—流文件

post
请求正文（提交给服务器的数据（流））
post请求请求头多了两个数据content-type（jpeg）mime—-content-length，也是需要我们写给服务端开发人员

GET请求

package com.itheima.getmethod;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import java.net.URLEncoder;import com.itheima.htmlviewer.tools.Tools;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.app.Activity;import android.view.Menu;import android.view.View;import android.widget.EditText;import android.widget.Toast;public class MainActivity extends Activity {    //    Handler handler = new Handler(){        public void handleMessage(android.os.Message msg) {            Toast.makeText(MainActivity.this, (String)msg.obj, 0).show();        }    };    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);    }    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(){            @Override            public void run() {                @SuppressWarnings("deprecation")                String path = "http://169.254.244.136/Web2/servlet/Login?name=" + URLEncoder.encode(name) + //对要提交的表单数据进行url编码                                                                                        "&pass=" + pass;                try {                    URL url = new URL(path);                    //打开connection连接                    HttpURLConnection conn = (HttpURLConnection) url.openConnection();                    //设置请求方法                    conn.setRequestMethod("GET");                    //设置连接超时时间                    conn.setConnectTimeout(8000);                    //设置请求超时时间                    conn.setReadTimeout(8000);                    if(conn.getResponseCode() == 200){                        InputStream is = conn.getInputStream();                        String text = Tools.getTextFromStream(is);//设置方法读取流数据                        Message msg = handler.obtainMessage();                        msg.obj = text;                        handler.sendMessage(msg);                    }                } catch (Exception e) {                    // TODO Auto-generated catch block                    e.printStackTrace();                }            }        };        t.start();    }}

Tool类方法

package com.itheima.htmlviewer.tools;import java.io.ByteArrayOutputStream;import java.io.IOException;import java.io.InputStream;public class Tools {    public static String getTextFromStream(InputStream is){        byte[] b = new byte[1024];        int len;        ByteArrayOutputStream bos = new ByteArrayOutputStream();        try {            while((len = is.read(b)) != -1){                bos.write(b, 0, len);            }            //把字节数组输出流转换成字节数组，然后用字节数组构造一个字符串            String text = new String(bos.toByteArray());            return text;        } catch (Exception e) {            // TODO Auto-generated catch block            e.printStackTrace();        }        return null;    }}添加网络权限

POST请求package com.itheima.postmethod;import java.io.InputStream;import java.io.OutputStream;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import java.net.URLEncoder;import com.itheima.htmlviewer.tools.Tools;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.app.Activity;import android.view.Menu;import android.view.View;import android.widget.EditText;import android.widget.Toast;public class MainActivity extends Activity {    Handler handler = new Handler(){        public void handleMessage(android.os.Message msg) {            Toast.makeText(MainActivity.this, (String)msg.obj, 0).show();        }    };    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);    }    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(){            @Override            public void run() {                String path = "http://169.254.244.136/Web2/servlet/Login";                try {                    URL url = new URL(path);                    HttpURLConnection conn = (HttpURLConnection) url.openConnection();                    conn.setRequestMethod("POST");                    conn.setConnectTimeout(8000);                    conn.setReadTimeout(8000);                    //添加post请求头中自动添加的属性                    //流里的数据的mimetype                    conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");                    String content = "name=" + URLEncoder.encode(name) + "&pass=" + pass;                    //流里数据的长度                    conn.setRequestProperty("Content-Length", content.length() + "");                    //打开连接对象的输出流                    conn.setDoOutput(true);                    //获取连接对象的输出流                    OutputStream os = conn.getOutputStream();                    //把数据写入输出流中                    os.write(content.getBytes());                    if(conn.getResponseCode() == 200){                        InputStream is = conn.getInputStream();                        String text = Tools.getTextFromStream(is);                        Message msg = handler.obtainMessage();                        msg.obj = text;                        handler.sendMessage(msg);                    }                } catch (Exception e) {                    // TODO Auto-generated catch block                    e.printStackTrace();                }            }        };        t.start();    }}

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