Util: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;
}

}