简单封装Http的Get和Post请求

虽然现在有许多成型的Http框架，比如OkHttp、Volley，但是有时候我们仅仅需要一个很简单的功能，比如仅需要一个Get和Post，那么我们用这些库就有种杀机用宰牛刀的感觉。于是就想着自己去封装一个简单的类来实现这部分功能。

以下是我的工具类：

public class HttpUtil {

private HttpUtil() {
}

/**
* get方法请求数据
*
* @param url      请求地址
* @param params   请求参数
* @param callBack 回调接口
*/
public static void get(final String url, final Map<String, String> params, final HttpResponseCallBack callBack) {
if (callBack != null) {
new Thread(new Runnable() {
@Override
public void run() {
try {
//拼装请求参数列表
final StringBuilder sb = new StringBuilder(64);
if (params != null) {
sb.append("?");
for (Map.Entry<String, String> entry : params.entrySet()) {
sb.append(entry.getKey());
sb.append("=");
sb.append(entry.getValue());
sb.append("&");
}
sb.deleteCharAt(sb.length() - 1);
}

//构建新连接
URL httpUrl = new URL(url + sb.toString());
LogUtil.i(url + sb.toString());
HttpURLConnection conn = (HttpURLConnection) httpUrl.openConnection();
conn.setConnectTimeout(3000);
conn.setReadTimeout(3000);
conn.setRequestMethod("GET");
BufferedReader br = new BufferedReader(
new InputStreamReader(conn.getInputStream(), "UTF-8"));

//接受返回数据
sb.setLength(0);
String strTemp;
while ((strTemp = br.readLine()) != null) {
sb.append(strTemp).append('\n');
}

conn.disconnect();

AsyncRun.run(new Runnable() {
@Override
public void run() {
callBack.onSuccess(sb.toString());
}
});

} catch (final IOException e) {
AsyncRun.run(new Runnable() {
@Override
public void run() {
callBack.onFailure("失败信息：", e);
}
});
}
}
}).start();
}
}

/**
* post方法请求数据
*
* @param url      请求地址
* @param params   请求参数
* @param callBack 回调地址
*/
public static void post(final String url, final Map<String, String> params, final HttpResponseCallBack callBack) {
if (callBack != null) {
new Thread(new Runnable() {
@Override
public void run() {
try {
final StringBuilder sb = new StringBuilder(64);

URL httpUrl = new URL(url);
HttpURLConnection conn = (HttpURLConnection) httpUrl.openConnection();
conn.setConnectTimeout(3000);
conn.setReadTimeout(3000);
conn.setRequestMethod("POST");
conn.setDoOutput(true);

//拼装请求参数列表
if (params != null) {
for (Map.Entry<String, String> entry : params.entrySet()) {
sb.append(entry.getKey());
sb.append("=");
sb.append(entry.getValue());
sb.append("&");
}
sb.deleteCharAt(sb.length() - 1);
conn.getOutputStream().write(sb.toString().getBytes());
}

BufferedReader br = new BufferedReader(
new InputStreamReader(conn.getInputStream(), "UTF-8"));

//接受返回数据
sb.setLength(0);
String strTemp;
while ((strTemp = br.readLine()) != null) {
sb.append(strTemp).append('\n');
}

conn.disconnect();

AsyncRun.run(new Runnable() {
@Override
public void run() {
callBack.onSuccess(sb.toString());
}
});

} catch (final IOException e) {
AsyncRun.run(new Runnable() {
@Override
public void run() {
callBack.onFailure("失败信息：", e);
}
});
}
}
}).start();
}
}

/**
* 获取回调
*/
public interface HttpResponseCallBack {
void onSuccess(String result);

void onFailure(String result, Exception e);
}
}

因为我么的网络操作不可以在UI线程中执行，所以我们考虑在新线程中通过调用主线程的Handler把我们需要做的操作post到主线程中就可以了，我们进行一个简单的封装：

public final class AsyncRun {
public static void run(Runnable runnable){
Handler handler = new Handler(Looper.getMainLooper());
handler.post(runnable);
}
}

这个时候我们就可以在业务代码中进行调用（这个例子是百度CSDN这个关键词）：

HashMap<String, String> request = new HashMap<>(2);
map.put("ie", "UTF-8");
map.put("wd", "CSDN");
HttpUtil.post("https://www.baidu.com/s", request, new HttpUtil.HttpResponseCallBack() {
@Override
public void onSuccess(String result) {
Log.i("TAG", result);
//这里已经实在主线程中运行了
//所以完全可以直接调用TextView之类的控件来显示我们的回调内容
}

@Override
public void onFailure(String result, Exception e) {
Log.i("TAG",  </span>result + e.toString());
}
});

为了简单起见，我把参数用一个Map来封装，这样不仅代码看起来更加简介，使用的时候已能够很方便了！