jdk HttpURLConnection类请求http接口工具类

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;


public class HttpUtil {


// post请求
public static final String HTTP_POST = "POST";


// get请求
public static final String HTTP_GET = "GET";


// utf-8字符编码
public static final String CHARSET_UTF_8 = "UTF-8";


// HTTP内容类型
public static final String CONTENT_TYPE_TEXT_HTML = "text/xml";


// HTTP内容类型
public static final String CONTENT_TYPE_FORM_URL = "application/x-www-form-urlencoded;charset=" + CHARSET_UTF_8;


// 请求超时时间
public static final int SEND_REQUEST_TIME_OUT = 20000;


// 将读超时时间
public static final int READ_TIME_OUT = 20000;


/**
* 
* @param requestType
*            请求类型
* @param urlStr
*            请求地址
* @param body
*            请求发送内容
* @return 返回内容
* @throws Exception 
*/
public static String requestMethod(String requestType, String urlStr, String body) throws Exception {
//long star = System.currentTimeMillis();
boolean isDoInput = false;
if (body != null && body.length() > 0){
isDoInput = true;
}
OutputStream outputStream = null;
OutputStreamWriter outputStreamWriter = null;
InputStream inputStream = null;
InputStreamReader inputStreamReader = null;
BufferedReader reader = null;
StringBuffer resultBuffer = new StringBuffer();
String tempLine = null;
try {
URL url = new URL(urlStr);
URLConnection urlConnection = url.openConnection();
HttpURLConnection httpURLConnection = (HttpURLConnection) urlConnection;
if (isDoInput) {
httpURLConnection.setDoOutput(true);
httpURLConnection.setRequestProperty("Content-Length", String.valueOf(body.length()));
}
httpURLConnection.setDoInput(true);
httpURLConnection.setConnectTimeout(SEND_REQUEST_TIME_OUT);
httpURLConnection.setReadTimeout(READ_TIME_OUT);
httpURLConnection.setUseCaches(false);
//httpURLConnection.addRequestProperty("User-Agent", "Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.9.2.8) Firefox/3.6.8");  
httpURLConnection.setRequestProperty("Accept-Charset", CHARSET_UTF_8);
httpURLConnection.setRequestProperty("Content-Type", CONTENT_TYPE_FORM_URL);
httpURLConnection.setRequestMethod(requestType);


httpURLConnection.connect();


if (isDoInput) {
outputStream = httpURLConnection.getOutputStream();
outputStreamWriter = new OutputStreamWriter(outputStream);
outputStreamWriter.write(body);
outputStreamWriter.flush();// 刷新
}
if (httpURLConnection.getResponseCode() >= 300) {
throw new Exception("http error code is :" + httpURLConnection.getResponseCode());
}


if (httpURLConnection.getResponseCode() == HttpURLConnection.HTTP_OK) {
inputStream = httpURLConnection.getInputStream();
inputStreamReader = new InputStreamReader(inputStream, CHARSET_UTF_8);
reader = new BufferedReader(inputStreamReader);

while ((tempLine = reader.readLine()) != null) {
resultBuffer.append(tempLine);
}
}
//httpURLConnection.disconnect();
} catch (MalformedURLException e) {
e.printStackTrace();
} finally {// 关闭流
try {
if (outputStreamWriter != null) {
outputStreamWriter.close();
}
} catch (Exception e) {
e.printStackTrace();
}
try {
if (outputStream != null) {
outputStream.close();
}
} catch (Exception e) {
e.printStackTrace();
}
try {
if (reader != null) {
reader.close();
}
} catch (Exception e) {
e.printStackTrace();
}
try {
if (inputStreamReader != null) {
inputStreamReader.close();
}
} catch (Exception e) {
e.printStackTrace();
}
try {
if (inputStream != null) {
inputStream.close();
}
} catch (Exception e) {
e.printStackTrace();
}
}
//System.out.println("耗时："+(System.currentTimeMillis()-star)+"毫秒");
return resultBuffer.toString();
}

/**
* 请求重试机制 二次请求需等待0.5秒
* @param requestType 请求类型
* @param action 请求接口
* @param params 请求参数 json格式
* @param retry true-重试, false-不重试
* @return
*/
public static String retryHandler(String requestType, String action, String params, boolean retry){
try {
return requestMethod(requestType,action,params);
} catch (Exception e) {
e.printStackTrace();
if(retry){
try {
Thread.sleep(500);
return requestMethod(requestType,action,params);
} catch (Exception e1) {
e1.printStackTrace();
}
}
}
return "-100001"; //服务端接口出错
}

public static void main(String[] args) {
System.out.println("----------------star------------------");
System.out.println(ApiInterface.CHANNEL_INFO);
//String params = "{\"msgheader\":{\"route_id\":\"LZZBGE\",\"route_name\":\"1\",\"login_type\":\"1\",\"mobile\":\"1\",\"timestamp\":\"1\"},\"msgbody\":{\"nonce\":\"1\",\"sign\":\"7BBC156C8D9586E4B874385059FB966F\"}}";
String params = "{\"msgheader\":{},\"msgbody\":{\"keyword\":\"\",\"sign\":\"DAA6320AE7D6C11F369E80808E52A697\"}}";
try {
System.out.println(requestMethod(HTTP_POST,ApiInterface.PRODUCT_LIST,params));
} catch (Exception e) {
e.printStackTrace();
System.out.println("Exception");
}
System.out.println("----------------end------------------");
}


}