我有代码 zxing 条码阅读器。我想从 msql 服务器检索有关条形码的数据。
- BarcodeScannerActivity
- 意图积分器
- 意图结果
我使用 json 从服务器检索数据，并且我已经成功完成了以下代码
public class CustomHttpClient {
/** The time it takes for our client to timeout */
public static final int HTTP_TIMEOUT = 30 * 1000; // milliseconds
/** Single instance of HttpClient */
private static HttpClient mHttpClient;
/**
* Get our single instance of our HttpClient object.
*
* @return an HttpClient object with connection parameters set
*/
private static HttpClient getHttpClient() {
if (mHttpClient == null) {
mHttpClient = new DefaultHttpClient();
final HttpParams params = mHttpClient.getParams();
HttpConnectionParams.setConnectionTimeout(params, HTTP_TIMEOUT);
HttpConnectionParams.setSoTimeout(params, HTTP_TIMEOUT);
ConnManagerParams.setTimeout(params, HTTP_TIMEOUT);
}
return mHttpClient;
}
/**
* Performs an HTTP Post request to the specified url with the specified
* parameters.
*
* @param url
* The web address to post the request to
* @param postParameters
* The parameters to send via the request
* @return The result of the request
* @throws Exception
*/
public static String executeHttpPost(String url,ArrayList<NameValuePair> postParameters) throws Exception {
BufferedReader in = null;
try {
HttpClient client = getHttpClient();
HttpPost request = new HttpPost(url);
UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(postParameters);
request.setEntity(formEntity);
HttpResponse response = client.execute(request);
in = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
StringBuffer sb = new StringBuffer("");
String line = "";
String NL = System.getProperty("line.separator");
while ((line = in.readLine()) != null) {
sb.append(line + NL);
}
in.close();
String result = sb.toString();
return result;
} finally {
if (in != null) {
try {
in.close();
} catch (IOException e) {
Log.e("log_tag", "Error converting result "+e.toString());
e.printStackTrace();
}
}
}
}
/**
* Performs an HTTP GET request to the specified url.
*
* @param url
* The web address to post the request to
* @return The result of the request
* @throws Exception
*/
public static String executeHttpGet(String url) throws Exception {
BufferedReader in = null;
try {
HttpClient client = getHttpClient();
HttpGet request = new HttpGet();
request.setURI(new URI(url));
HttpResponse response = client.execute(request);
in = new BufferedReader(new InputStreamReader(response.getEntity()
.getContent()));
StringBuffer sb = new StringBuffer("");
String line = "";
String NL = System.getProperty("line.separator");
while ((line = in.readLine()) != null) {
sb.append(line + NL);
}
in.close();
String result = sb.toString();
return result;
} finally {
if (in != null) {
try {
in.close();
} catch (IOException e) {
Log.e("log_tag", "Error converting result "+e.toString());
e.printStackTrace();
}
}
}
}
public class JSONUseActivity extends Activity {
EditText byear ; // To take birthyear as input from user
Button submit;
TextView tv;
int by= 1987;// TextView to show the result of MySQL query
String returnString; // to store the result of MySQL query after decoding JSON
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder()
.detectDiskReads().detectDiskWrites().detectNetwork() // StrictMode is most commonly used to catch accidental disk or network access on the application's main thread
.penaltyLog().build());
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
byear = (EditText) findViewById(R.id.editText1);
submit = (Button) findViewById(R.id.submitbutton);
tv = (TextView) findViewById(R.id.showresult);
// define the action when user clicks on submit button
submit.setOnClickListener(new View.OnClickListener(){
public void onClick(View v) {
// declare parameters that are passed to PHP script i.e. the name "birthyear" and its value submitted by user
ArrayList<NameValuePair> postParameters = new ArrayList<NameValuePair>();
// define the parameter
postParameters.add(new BasicNameValuePair("birthyear", byear.getText().toString()));
String response = null;
// call executeHttpPost method passing necessary parameters
try {
response = CustomHttpClient.executeHttpPost(
//"http://129.107.187.135/CSE5324/jsonscript.php", // your ip address if using localhost server
"http://srknysv.netai.net/dosyalar/jsonscript.php", // in case of a remote server
postParameters);
// store the result returned by PHP script that runs MySQL query
String result = response.toString();
//parse json data
try{
returnString = "";
JSONArray jArray = new JSONArray(result);
for(int i=0;i<jArray.length();i++){
JSONObject json_data = jArray.getJSONObject(i);
Log.i("log_tag","id: "+json_data.getInt("id")+
", name: "+json_data.getString("name")+
", sex: "+json_data.getInt("sex")+
", birthyear: "+json_data.getInt("birthyear")
);
//Get an output to the screen
returnString += "\n" + json_data.getString("name") + " -> "+ json_data.getInt("birthyear");
}
}
catch(JSONException e){
Log.e("log_tag", "Error parsing data "+e.toString());
}
try{
tv.setText(returnString);
}
catch(Exception e){
Log.e("log_tag","Error in Display!" + e.toString());;
}
}
catch (Exception e) {
Log.e("log_tag","Error in http connection!!" + e.toString());
}
}
});
}
我的两个项目都运行良好
我从服务器获取值
postParameters.add(new BasicNameValuePair("birthyear", byear.getText().toString()));
条形码阅读器返回以下代码的意图`public final class IntentResult {
private final String contents;
private final String formatName;
private final byte[] rawBytes;
private final Integer orientation;
private final String errorCorrectionLevel;
IntentResult() {
this(null, null, null, null, null);
}
IntentResult(String contents,
String formatName,
byte[] rawBytes,
Integer orientation,
String errorCorrectionLevel) {
this.contents = contents;
this.formatName = formatName;
this.rawBytes = rawBytes;
this.orientation = orientation;
this.errorCorrectionLevel = errorCorrectionLevel;
}
@Override
public String toString() {
StringBuilder dialogText = new StringBuilder(100);
dialogText.append("Format: ").append(formatName).append('\n');
dialogText.append("Contents: ").append(contents).append('\n');
int rawBytesLength = rawBytes == null ? 0 : rawBytes.length;
dialogText.append("Raw bytes: (").append(rawBytesLength).append(" bytes)\n");
dialogText.append("Orientation: ").append(orientation).append('\n');
dialogText.append("EC level: ").append(errorCorrectionLevel).append('\n');
return dialogText.toString();
}
}` 如何使用此代码将扫描的条形码代码发送到服务器。