学习HTTP协议访问数据(Okhttp类实现)

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本文介绍如何使用OkHttp库进行HTTP GET和POST请求，包括同步和异步请求方式，并展示了如何处理响应数据。

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通过Okhttp实现http协议访问数据，首先需要在工程中导入okhttp.jar和okio.jar两个包

方法1：GET请求方式访问数据，将获取的数据打印在控制台中

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;

public class OKHttpGetDemo {

	public static void main(String[] args) throws IOException {
		OkHttpClient client = new OkHttpClient();
		Request request = new Request.Builder().url("http://localhost:8080/JavaStudyDemo/message.txt").build();
		Response response = client.newCall(request).execute();
		InputStream is = response.body().byteStream();
		BufferedReader br = new BufferedReader(new InputStreamReader(is, "utf-8"));
		String line = null;
		while ((line = br.readLine()) != null) {
			System.out.println(line);
		}
		br.close();
	}
}

方法2：GET请求方式访问数据，使用匿名内部类

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.FormBody;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;

public class OkHttpPostDemo {
	static final String POST_PATH = "http://app.vmoiver.com/apiv3/post/getPostInCate?";
	static String str = "cateid=0&p=3";

	public static void main(String[] args) {
		OkHttpClient client = new OkHttpClient();
		FormBody.Builder buider = new FormBody.Builder();
		buider.add("cateid", "0");
		buider.add("p", "2");

		RequestBody body = buider.build();
		Request request = new Request.Builder().url(POST_PATH).post(body).build();
		client.newCall(request).enqueue(new Callback() {

			@Override
			public void onResponse(Call arg0, Response arg1) throws IOException {
				if (arg1.isSuccessful()) {
					BufferedReader br = new BufferedReader(new InputStreamReader(arg1.body().byteStream()));
					String line = null;
					while ((line = br.readLine()) != null) {
						System.out.println(line);
					}
					br.close();
				}
			}

			@Override
			public void onFailure(Call arg0, IOException arg1) {
				System.out.println("连接失败");
			}
		});

	}
}

方法三：POST请求（匿名内部类）

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.FormBody;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;

public class OkHttpPostDemo {
	static final String POST_PATH = "http://app.vmoiver.com/apiv3/post/getPostInCate?";
	static String str = "cateid=0&p=3";

	public static void main(String[] args) {
		OkHttpClient client = new OkHttpClient();
		FormBody.Builder buider = new FormBody.Builder();
		buider.add("cateid", "0");
		buider.add("p", "2");

		RequestBody body = buider.build();
		Request request = new Request.Builder().url(POST_PATH).post(body).build();
		client.newCall(request).enqueue(new Callback() {

			@Override
			public void onResponse(Call arg0, Response arg1) throws IOException {
				if (arg1.isSuccessful()) {
					BufferedReader br = new BufferedReader(new InputStreamReader(arg1.body().byteStream()));
					String line = null;
					while ((line = br.readLine()) != null) {
						System.out.println(line);
					}
					br.close();
				}
			}

			@Override
			public void onFailure(Call arg0, IOException arg1) {
				System.out.println("连接失败");
			}
		});

	}
}