黑马课上的 Http操作类

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本文详细介绍了Android应用中向服务器提交数据的各种方式，包括GET、POST等方法，并演示了使用HttpURLConnection及HttpClient进行数据发送的具体实现。

package cn.itcast.login.service;


import java.io.File;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;


import org.apache.commons.httpclient.methods.PostMethod;
import org.apache.commons.httpclient.methods.multipart.FilePart;
import org.apache.commons.httpclient.methods.multipart.MultipartRequestEntity;
import org.apache.commons.httpclient.methods.multipart.Part;
import org.apache.commons.httpclient.methods.multipart.StringPart;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;


import cn.itcast.login.util.StreamTool;


public class DataService {


	/**
	 * 通过get请求提交数据到服务器
	 * 
	 * @param path
	 *            服务器servlet的地址
	 * @param name
	 *            用户名
	 * @param password
	 *            密码
	 * @return 服务器返回回来的string数据
	 */
	public static String sendDataByGet(String path, String name, String password)
			throws Exception {
		String param1 = URLEncoder.encode(name);
		String param2 = URLEncoder.encode(password);
		URL url = new URL(path + "?name=" + param1 + "&password=" + param2);
		HttpURLConnection conn = (HttpURLConnection) url.openConnection();


		conn.setRequestMethod("GET");
		conn.setReadTimeout(5000);
		// 数据并没有发送给服务器
		// 获取服务器返回的流信息
		InputStream is = conn.getInputStream();
		byte[] result = StreamTool.getBytes(is);


		return new String(result);
	}


	// get post
	// get 一次提交的数据数据量比较小 4K 内部其实通过组拼url的方式
	// post 可以提交比较大的数据 form表单的形式 流的方式写到服务器
	/**
	 * 采用post的方式 提交数据到服务器
	 * 
	 * @param path
	 *            服务器servlet的地址
	 * @param name
	 *            用户名
	 * @param password
	 *            密码
	 * @return 服务器返回的数据信息
	 * @throws Exception
	 */
	public static String sendDataByPost(String path, String name,
			String password) throws Exception {
		String param1 = URLEncoder.encode(name);
		String param2 = URLEncoder.encode(password);
		URL url = new URL(path);
		HttpURLConnection conn = (HttpURLConnection) url.openConnection();


		String data = "name=" + param1 + "&password=" + param2;


		conn.setRequestMethod("POST");
		conn.setConnectTimeout(5000);
		// 设置 http协议可以向服务器写数据
		conn.setDoOutput(true);
		// 设置http协议的消息头
		conn.setRequestProperty("Content-Type",
				"application/x-www-form-urlencoded");
		conn.setRequestProperty("Content-Length", data.length() + "");
		// 把我们准备好的data数据写给服务器
		OutputStream os = conn.getOutputStream();
		os.write(data.getBytes());
		// httpurlconnection 底层实现 outputstream 是一个缓冲输出流
		// 只要我们获取任何一个服务器返回的信息 , 数据就会被提交给服务器 , 得

到服务器返回的流信息
		int code = conn.getResponseCode();
		if (code == 200) {
			InputStream is = conn.getInputStream();
			byte[] result = StreamTool.getBytes(is);
			return new String(result);
		} else {
			throw new IllegalStateException("服务器状态异常");
		}
	}
	
	
	/**
	 * httpclient 浏览器的简单包装 
	 * new HttpClient 就相当于得到了一个浏览器 
	 */
	public static String sendDataByHttpClientGet (String path , String 

name,String password) throws Exception{
		
		//1. 获取到一个浏览器的实例 
		HttpClient client = new DefaultHttpClient();
		//2. 准备请求的地址 
		String param1 = URLEncoder.encode(name);
		String param2 = URLEncoder.encode(password);
		HttpGet httpGet = new HttpGet(path + "?name=" + param1 + "&password=" 

+ param2);
		
		//3. 敲回车 发请求 
		HttpResponse  ressponse = client.execute(httpGet);
		int code = ressponse.getStatusLine().getStatusCode();
		if(code == 200){
			InputStream is  =ressponse.getEntity().getContent();
			byte[] result = StreamTool.getBytes(is);
			return new String(result);
		}
		else{
			throw new IllegalStateException("服务器状态异常");
		}
	}
	
	public static String sendDataByHttpClientPost(String path , String 

name,String password) throws Exception{
		
		//1. 获取到一个浏览器的实例 
		HttpClient client = new DefaultHttpClient();
		//2. 准备要请求的 数据类型 
		HttpPost httppost = new HttpPost(path);
		// 键值对 
		List< NameValuePair> parameters = new ArrayList<NameValuePair>();
		
		parameters.add(new BasicNameValuePair("name", name));
		parameters.add(new BasicNameValuePair("password", password));
		
		UrlEncodedFormEntity entity = new UrlEncodedFormEntity(parameters, 

"utf-8");
		
		
		//3.设置post请求的数据实体 
		httppost.setEntity(entity);
		
		//4. 发送数据给服务器
		HttpResponse  ressponse = client.execute(httppost);
		int code = ressponse.getStatusLine().getStatusCode();
		if(code == 200){
			InputStream is  =ressponse.getEntity().getContent();
			byte[] result = StreamTool.getBytes(is);
			return new String(result);
		}
		else{
			throw new IllegalStateException("服务器状态异常");
		}
	}
	
	/**
	 * 提交数据给服务器 带一个文件 使用httpclient3.1传文件
	 * @param path
	 * @param name
	 * @param password
	 * @param filepath 文件在手机上的路径 
	 * 
	 * @return
	 * @throws Exception
	 */
	public  static String sendDataByHttpClientPost(String path , String 

name,String password ,String filepath) throws Exception{
		// 实例化上传数据的 数组  part []
		Part[] parts = {new StringPart("name", name), 
				  new StringPart("password", password), 
				  new FilePart("file", new File(filepath))};
		
		PostMethod filePost = new PostMethod(path);
		
	  
		filePost.setRequestEntity(new MultipartRequestEntity(parts, 

filePost.getParams()));
		org.apache.commons.httpclient.HttpClient client = new 

org.apache.commons.httpclient.HttpClient();
        client.getHttpConnectionManager().getParams()
          .setConnectionTimeout(5000);
		int status = client.executeMethod(filePost);
		if(status==200){
			
			System.out.println( filePost.getResponseCharSet());
			String result = new String(filePost.getResponseBodyAsString

());
			String ha = new String ( result.getBytes("ISO-8859-1"),"UTF-

8");
			System.out.println(ha);
			
			System.out.println("--"+result);
			return result;
		}
		else{
			throw new IllegalStateException("服务器状态异常");
		}
 
	}
}

package cn.itcast.login.util;


import java.io.ByteArrayOutputStream;
import java.io.InputStream;


public class StreamTool {
	/**
	 * 把一个inputstream里面的内容转化成一个byte[] 
	 */
	
	public static byte[] getBytes(InputStream is) throws Exception{
		ByteArrayOutputStream bos = new ByteArrayOutputStream();
		byte[] buffer = new byte[1024];
		int len = 0;
		while((len = is.read(buffer))!=-1){
			bos.write(buffer, 0, len);
		}
		is.close();
		bos.flush();
		byte[] result = bos.toByteArray();
		System.out.println(new String(result));
		return  result;
	}
}

package cn.itcast.login;

import cn.itcast.login.service.DataService;
import android.app.Activity;
import android.os.Bundle;
import android.provider.ContactsContract.Contacts.Data;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class DemoActivity extends Activity implements OnClickListener {
	private EditText mEtName;
	private EditText mEtPassword;
	private EditText mEtFilePath;
	private Button mBtLogin;
	private Button mBtLoginPost;
	private Button mBtLoginClientGet;
	private Button mBtLoginClientPost;
	private Button mBtLoginClientPostFile;
	
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        mEtName = (EditText) this.findViewById(R.id.et_name);
        mEtPassword = (EditText) this.findViewById(R.id.et_password);
        mBtLogin = (Button) this.findViewById(R.id.bt_login);
        mBtLoginPost = (Button)this.findViewById(R.id.bt_login_post);
        mBtLoginClientGet =  (Button)this.findViewById(R.id.bt_login_client_get);
        mBtLoginClientPostFile =  (Button)this.findViewById(R.id.bt_login_client_post_file);
        mBtLoginClientPost =   (Button)this.findViewById(R.id.bt_login_client_post);
        mEtFilePath = (EditText)this.findViewById(R.id.et_file_path);
        mBtLogin.setOnClickListener(this);
        mBtLoginPost.setOnClickListener(this);
        mBtLoginClientGet.setOnClickListener(this);
        mBtLoginClientPost.setOnClickListener(this);
        mBtLoginClientPostFile.setOnClickListener(this);
    }


	@Override
	public void onClick(View v) {
		String name = mEtName.getText().toString().trim();
		String password = mEtPassword.getText().toString().trim();
		if("".equals(name)||"".equals(password)){
			Toast.makeText(this, "用户名或密码不能为空", 0).show();
			return;
		}
		String path = getResources().getString(R.string.servleturl);
		switch (v.getId()) {
		case R.id.bt_login:

			// 通过get请求 发送数据到服务器 
			
			try {
				String result = DataService.sendDataByGet(path, name, password);
				Toast.makeText(this, result, 0).show();
			} catch (Exception e) {
				Toast.makeText(this, "访问网路异常", 0).show();
				e.printStackTrace();
			}
			
			break;
		case R.id.bt_login_post:
			try {
				String result =  DataService.sendDataByPost(path, name, password);
				Toast.makeText(this, result, 0).show();
			} catch (Exception e) {
				Toast.makeText(this, "访问网路异常", 0).show();
				e.printStackTrace();
			}
			break;
		case R.id.bt_login_client_get:
			try {
				String result = DataService.sendDataByHttpClientGet(path, name, password);
				Toast.makeText(this, result, 0).show();
			} catch (Exception e) {
				Toast.makeText(this, "访问网路异常", 0).show();
				e.printStackTrace();
			}
			
			
			break;
		case R.id.bt_login_client_post:
			try {
				String result = DataService.sendDataByHttpClientPost(path, name, password);
				Toast.makeText(this, result, 0).show();
			} catch (Exception e) {
				Toast.makeText(this, "访问网路异常", 0).show();
				e.printStackTrace();
			}
			break;	
		case R.id.bt_login_client_post_file:
			try {
				String filepath = mEtFilePath.getText().toString().trim();
				if("".equals(filepath)){
					Toast.makeText(this, "路径不能为空", 0).show();
					return ;
				}
				String result = DataService.sendDataByHttpClientPost(path, name, password, filepath);
				Toast.makeText(this, result, 0).show();
				System.out.println(new String( result.getBytes("iso8859-1"),"utf-8"));
				
			} catch (Exception e) {
				Toast.makeText(this, "访问网路异常", 0).show();
				e.printStackTrace();
			}
			break;	
		}
		
	}
}