使用HttpURLConnection+AsyncTask访问webservice接口（返回json字符串）

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现在很多APP程序网络通信都是基于http的，数据格式我访问常常使用如下配置，代码如下：

1.CstorAsyncTask.java[异步操作]

public class CstorAsyncTask extends AsyncTask<Object, Integer, String> {
/**
* 回调接口
*/
private RequestCallBack callback;

public CstorAsyncTask(RequestCallBack cb) {
this.callback = cb;
}

@SuppressWarnings("unchecked")
@Override
protected String doInBackground(Object... params) {
String responseStr = "";
String requestMethod = params[0].toString();
String url = params[1].toString();
HashMap<String, String> param = (HashMap<String, String>) params[2];
if (requestMethod.equals(HttpTools.POST)) {
responseStr = HttpURLConnectionTools.obtainPostUrlContext(url,
param);
} else if (requestMethod.equals(HttpTools.GET)) {
responseStr = HttpURLConnectionTools
.obtainGetUrlContext(url, param);
}
return responseStr;
}

@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
if (null != callback) {
if (httpIsNull(result)) {
callback.onFailure();
} else {
callback.onSuccess(result);
}
}
}

public static boolean httpIsNull(String str) {
if (null == str) {
return true;
}
if (("").equals(str)) {
return true;
}
if (("null").equals(str)) {
return true;
}
return false;
}
}

2.RequestCallBack.java[数据加载回调接口]

public interface RequestCallBack {
public void onSuccess(String response);

public void onFailure();
}

3.HttpURLConnectionTools.java[HTTP请求(GET,POST)]

public class HttpURLConnectionTools {
/**
* 通过GET获取某个url的内容
*
* @param strUrl
* @param params
* @return String
*/
public static String obtainGetUrlContext(String strUrl,
Map<String, String> params) {
String responseStr = "";
InputStream is = null;
HttpURLConnection conn = null;
BufferedReader bufferedReader = null;
try {
Log.e(HttpTools.TAG, getRequestUrl(strUrl, params));
URL url = new URL(getRequestUrl(strUrl, params));
conn = (HttpURLConnection) url.openConnection();
conn.setReadTimeout(HttpTools.ReadOutTime /* milliseconds */);
conn.setConnectTimeout(HttpTools.ConnectOutTime /* milliseconds */);
conn.setRequestMethod(HttpTools.GET);
conn.setDoInput(true);
conn.connect();
int responseCode = conn.getResponseCode();
if (responseCode == 200) {
// is = conn.getInputStream();
// responseStr = readInputStream(is);
bufferedReader = new BufferedReader(new InputStreamReader(
conn.getInputStream()));
String line;
while ((line = bufferedReader.readLine()) != null) {
responseStr += line;
}
}
} catch (Exception e) {
Log.e(HttpTools.TAG, "obtainGetUrlContext is err");
// e.printStackTrace();
} finally {
if (is != null) {
try {
conn.disconnect();
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return responseStr;
}

/**
* 通过POST获取某个url的内容
*
* @param strUrl
* @param params
* @return String
*/
public static String obtainPostUrlContext(String strUrl,
Map<String, String> params) {
String responseStr = "";
PrintWriter printWriter = null;
HttpURLConnection conn = null;
BufferedReader bufferedReader = null;
try {
URL url = new URL(strUrl);
// 打开和URL之间的连接
conn = (HttpURLConnection) url.openConnection();
// 设置通用的请求属性
conn.setRequestProperty("accept", "*/*");
conn.setRequestProperty("connection", "Keep-Alive");
conn.setRequestProperty("Content-Length",
String.valueOf(PostRequestUrl(params).length()));
conn.setReadTimeout(10000 /* milliseconds */);
conn.setConnectTimeout(10000 /* milliseconds */);
conn.setRequestMethod("POST");
// 发送POST请求必须设置如下两行
conn.setDoOutput(true);
conn.setDoInput(true);
// 获取URLConnection对象对应的输出流
printWriter = new PrintWriter(conn.getOutputStream());
// 发送请求参数
printWriter.write(PostRequestUrl(params).toString());
// flush输出流的缓冲
printWriter.flush();
// 根据ResponseCode判断连接是否成功
int responseCode = conn.getResponseCode();
if (responseCode != 200) {
Log.e(HttpTools.TAG, "data is err");
} else {
// responseStr = readInputStream(conn
// .getInputStream());
bufferedReader = new BufferedReader(new InputStreamReader(
conn.getInputStream()));
String line;
while ((line = bufferedReader.readLine()) != null) {
responseStr += line;
}
}
} catch (Exception e) {
Log.e(HttpTools.TAG, "obtainPostUrlContext is err");
e.printStackTrace();
} finally {
conn.disconnect();
if (printWriter != null) {
printWriter.close();
}
}
return responseStr;
}

/**
* 拼装get访问URL
*
* @param strUrl
* @param params
* @return
* @throws UnsupportedEncodingException
*/
private static String getRequestUrl(String strUrl,
Map<String, String> params) {
String requestUrl = strUrl;
int i = 0;
for (Map.Entry<String, String> param : params.entrySet()) {
if (i == 0) {
requestUrl += "?";
} else {
requestUrl += "&";
}
try {
if ((null == param.getValue()) || "".equals(param.getValue())) {
requestUrl += param.getKey() + "=";
} else {
requestUrl += param.getKey() + "="
+ URLEncoder.encode(param.getValue(), "UTF-8");
// +param.getValue();
}
} catch (Exception e) {
Log.e(HttpTools.TAG, "getRequestUrl第" + i + "个数据 is err");
// e.printStackTrace();
}
i++;
}
return requestUrl;
}

/**
* 拼装POST访问URL
*
* @param params
* @return
* @throws UnsupportedEncodingException
*/
@SuppressWarnings("rawtypes")
private static StringBuffer PostRequestUrl(Map<String, String> params) {
StringBuffer buffers = new StringBuffer();
Iterator<Entry<String, String>> it = params.entrySet().iterator();
while (it.hasNext()) {
Map.Entry element = (Map.Entry) it.next();
buffers.append(element.getKey());
buffers.append("=");
buffers.append(element.getValue());
buffers.append("&");
}
if (buffers.length() > 0) {
buffers.deleteCharAt(buffers.length() - 1);
}
return buffers;
}
}

4.HttpTools.java[网络请求常量]

public class HttpTools {
// log标识
public static final String TAG = "HttpTools";
// 请求类型
public static final String GET = "GET";
public static final String POST = "POST";
// 读取超时
public static final int ReadOutTime = 100000;
// 连接超时
public static final int ConnectOutTime = 100000;
}

DEMO下载地址：http://www.eoeandroid.com/thread-589937-1-1.html

使用HttpURLConnection+AsyncTask访问webservice接口（返回json字符串）

标签：

原文地址：http://www.cnblogs.com/androidDR/p/4545793.html