Android常用工具类之Http网络请求的工具类

Http请求的工具类

import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.HttpURLConnection;
import java.net.URL;

/**
* Http请求的工具类
*/
public class HttpUtils {

private static final int TIMEOUT_IN_MILLIONS = 5000;

public interface CallBack {
void onRequestComplete(String result);
}

/**
* 异步的Get请求
*
* @param urlStr
* @param callBack
*/
public static void doGetAsyn(final String urlStr, final CallBack callBack) {
new Thread() {
public void run() {
try {
String result = doGet(urlStr);
if (callBack != null) {
callBack.onRequestComplete(result);
}
} catch (Exception e) {
e.printStackTrace();
}

}

;
}.start();
}

/**
* 异步的Post请求
*
* @param urlStr
* @param params
* @param callBack
* @throws Exception
*/
public static void doPostAsyn(final String urlStr, final String params,
final CallBack callBack) throws Exception {
new Thread() {
public void run() {
try {
String result = doPost(urlStr, params);
if (callBack != null) {
callBack.onRequestComplete(result);
}
} catch (Exception e) {
e.printStackTrace();
}

}

;
}.start();

}

/**
* Get请求，获得返回数据
*
* @param urlStr
* @return
* @throws Exception
*/
public static String doGet(String urlStr) {
URL url = null;
HttpURLConnection conn = null;
InputStream is = null;
ByteArrayOutputStream baos = null;
try {
url = new URL(urlStr);
conn = (HttpURLConnection) url.openConnection();
conn.setReadTimeout(TIMEOUT_IN_MILLIONS);
conn.setConnectTimeout(TIMEOUT_IN_MILLIONS);
conn.setRequestMethod("GET");
conn.setRequestProperty("accept", "*/*");
conn.setRequestProperty("connection", "Keep-Alive");
if (conn.getResponseCode() == 200) {
is = conn.getInputStream();
baos = new ByteArrayOutputStream();
int len = -1;
byte[] buf = new byte[128];

while ((len = is.read(buf)) != -1) {
baos.write(buf, 0, len);
}
baos.flush();
return baos.toString();
} else {
throw new RuntimeException(" responseCode is not 200 ... ");
}

} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (is != null)
is.close();
} catch (IOException e) {
}
try {
if (baos != null)
baos.close();
} catch (IOException e) {
}
conn.disconnect();
}

return null;

}

/**
* 向指定 URL 发送POST方法的请求
*
* @param url 发送请求的 URL
* @param param 请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
* @return 所代表远程资源的响应结果
* @throws Exception
*/
public static String doPost(String url, String param) {
PrintWriter out = null;
BufferedReader in = null;
String result = "";
try {
URL realUrl = new URL(url);
// 打开和URL之间的连接
HttpURLConnection conn = (HttpURLConnection) realUrl
.openConnection();
// 设置通用的请求属性
conn.setRequestProperty("accept", "*/*");
conn.setRequestProperty("connection", "Keep-Alive");
conn.setRequestMethod("POST");
conn.setRequestProperty("Content-Type",
"application/x-www-form-urlencoded");
conn.setRequestProperty("charset", "utf-8");
conn.setUseCaches(false);
// 发送POST请求必须设置如下两行
conn.setDoOutput(true);
conn.setDoInput(true);
conn.setReadTimeout(TIMEOUT_IN_MILLIONS);
conn.setConnectTimeout(TIMEOUT_IN_MILLIONS);

if (param != null && !param.trim().equals("")) {
// 获取URLConnection对象对应的输出流
out = new PrintWriter(conn.getOutputStream());
// 发送请求参数
out.print(param);
// flush输出流的缓冲
out.flush();
}
// 定义BufferedReader输入流来读取URL的响应
in = new BufferedReader(
new InputStreamReader(conn.getInputStream()));
String line;
while ((line = in.readLine()) != null) {
result += line;
}
} catch (Exception e) {
e.printStackTrace();
}
// 使用finally块来关闭输出流、输入流
finally {
try {
if (out != null) {
out.close();
}
if (in != null) {
in.close();
}
} catch (IOException ex) {
ex.printStackTrace();
}
}
return result;
}
}