android http json请求3种不同写法

第一种：

public static String invoke() {
String result = null;
try {
final String url = "http://192.168.1.104:180/";

HttpPost httpPost = new HttpPost(url);
DefaultHttpClient httpClient = new DefaultHttpClient();

//基本身份验证
BasicCredentialsProvider bcp = new BasicCredentialsProvider();
String userName = "liudong";
String password = "123";
bcp.setCredentials(AuthScope.ANY, new UsernamePasswordCredentials(
userName, password));
httpClient.setCredentialsProvider(bcp);

HttpResponse httpResponse = httpClient.execute(httpPost);

StringBuilder builder = new StringBuilder();
BufferedReader reader = new BufferedReader(new InputStreamReader(
httpResponse.getEntity().getContent()));
for (String s = reader.readLine(); s != null; s = reader.readLine()) {
builder.append(s);
}
result = builder.toString();
Log.d(TAG, "result is ( " + result + " )");
} catch (Exception e) {
Log.e(TAG, e.toString());
}
Log.d(TAG, "over");
return result;
}

第二种：

public static String SendRequest(String adress_Http, String strJson) {

String returnLine = "";
try {

System.out.println("**************开始http通讯**************");
System.out.println("**************调用的接口地址为**************" + adress_Http);
System.out.println("**************请求发送的数据为**************" + strJson);
URL my_url = new URL(adress_Http);
HttpURLConnection connection = (HttpURLConnection) my_url.openConnection();
connection.setDoOutput(true);

connection.setDoInput(true);

connection.setRequestMethod("POST");

connection.setUseCaches(false);

connection.setInstanceFollowRedirects(true);

connection.setRequestProperty("Content-Type", "application/json");

connection.connect();
DataOutputStream out = new DataOutputStream(connection
.getOutputStream());

byte[] content = strJson.getBytes("utf-8");

out.write(content, 0, content.length);
out.flush();
out.close(); // flush and close

BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream(), "utf-8"));

//StringBuilder builder = new StringBuilder();

String line = "";

System.out.println("Contents of post request start");

while ((line = reader.readLine()) != null) {
// line = new String(line.getBytes(), "utf-8");
returnLine += line;

System.out.println(line);

}

System.out.println("Contents of post request ends");

reader.close();
connection.disconnect();
System.out.println("========返回的结果的为========" + returnLine);

} catch (Exception e) {
e.printStackTrace();
}

return returnLine;

}

第三种：

protected DAOReturnObject doInBackground(JSONObject... jsonObjects) {
DAOReturnObject returnObject;
try {
publishProgress("处理中...");
String serverUrl = "http://130.251.10.195:8091";//MServerSettingInfoDAO.getInstance().getUrl();
String url = serverUrl+"/customerLogin";
HttpPost httpPost = new HttpPost(url);
Log.i("URL", url);
ByteArrayEntity arrayEntity = null;
byte[] jsonByte = null;
try {
jsonByte = jsonObjects[0].toString().getBytes(DEFAULT_ENCODING);
arrayEntity = new ByteArrayEntity(jsonByte);
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
throw new Exception("数据打包出错!");
}
Log.d("M-Client", "request JSON:\n" + new String(jsonByte, DEFAULT_ENCODING ));
httpPost.setEntity(arrayEntity);
httpPost.setHeader("Accept", "application/json");
httpPost.setHeader("Content-type", "application/x-www-form-urlencoded");
HttpResponse httpResponse;
byte[] responseByte;
String responseStr;
try {
DefaultHttpClient httpclient = new DefaultHttpClient();
// 设置COOKIES
HttpContext localContext = new BasicHttpContext();
httpResponse = httpclient.execute(httpPost, localContext);
if (httpResponse.getStatusLine().getStatusCode() != 200) {
throw new Exception("接收数据出错:" + httpResponse.getStatusLine().toString());
}
responseByte = EntityUtils.toByteArray(httpResponse.getEntity());
//写缓存
// MServerSettingInfoDAO.getInstance().setStreamInfo(MClientFunction.getFileDir(),
// responseByte.length, "res");
// MClientFunction.setResCurrentStream(responseByte.length);

Log.d("M-Client", "response JSON:\n" + new String(responseByte, 0, responseByte.length, DEFAULT_ENCODING));
responseStr = new String(responseByte, 0, responseByte.length, DEFAULT_ENCODING);
} catch (ClientProtocolException e) {
Log.e("M-Client", "接收数据出错!", e);
throw new Exception("接收数据出错:" + e.getMessage(), e);
} catch (IOException e) {
Log.e("M-Client", "接收数据出错!", e);
throw new Exception("接收数据出错:" + e.getMessage(), e);
}
try {
Map<String, Object> responseMap = (Map<String, Object>)JsonUtil.json2Object(new JSONObject(responseStr));
returnObject = new DAOReturnObject(Integer.parseInt((String) responseMap.get("code")), (String) responseMap.get("msg"), responseMap.get("res"));
} catch (JSONException e) {
Log.e("M-Client", "接收数据出错!", e);
throw new Exception("接收数据出错:" + e.getMessage(), e);
}
} catch (Exception e) {
return new DAOReturnObject(99, e.getMessage(), null);
}
return returnObject;
}

记得加上访问权限：<uses-permission android:name="android.permission.INTERNET" />

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