Build_HttpBody() 问题//httpPost.setEntity() - Android [英] Problems with a Build_HttpBody() // httpPost.setEntity() - Android

问题描述

我使用 AndroidStudio 开发 AndroidApps 我开始做一个简单的 HttpPost 请求，但我遇到了问题，我能找到的所有帖子都是这样做的:

private void CheckLoguin_Request(String User, String Pass){//声明变量HttpClient httpClient = new DefaultHttpClient();HttpPost 请求 = 新的 HttpPost(url_Loguin);HttpResponse 响应；列表BodyRequest_Elements = new ArrayList();BodyRequest_Elements.add(new BasicNameValuePair("user_name", User));BodyRequest_Elements.add(new BasicNameValuePair("user_passwd", Pass));Request.setEntity(new UrlEncodedFormEntity(BodyRequest_Elements));响应 = httpClient.execute(Request);//将响应写入日志Log.d("Http 响应:", Response.toString());}

但是当我尝试调试 App Android Studio 时，在这行中出现 2 个错误:

 new UrlEncodedFormEntity(BodyRequest_Elements)//Error:(40, 27) error: unreported exception UnsupportedEncodingException;必须被捕获或声明被抛出响应 = httpClient.execute(Request);//Error:(41, 38) 错误:未报告的异常IOException;必须被捕获或声明被抛出

我可能需要安装更多的库或支持库吗?我做什么不好?任何人都可以帮助我吗?预先感谢并为我的英语感到抱歉！

PD1:如果您需要更多信息或代码，请告诉我！

解决方案

2016 年更新

使用 HttpURLConnection 类，我们需要打开 BufferedWritter 以插入我们的实体值，如下代码:

//声明变量私有列表值列表；...public Check_Loguin_Request(Context cx,String url, List ListOfValues){this.cx = cx;this.Url = url;this.ListOfValues=ListOfValues;}@覆盖受保护的字符串 doInBackground(字符串...字符串){//声明变量输入流是 = null;字符串结果 = "";URL url = 新的 URL(url);HttpURLConnection conn = (HttpURLConnection) url.openConnection();conn.setReadTimeout(10000);conn.setConnectTimeout(15000);conn.setRequestMethod("POST");conn.setDoInput(true);conn.setDoOutput(true);OutputStream os = conn.getOutputStream();BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(os, "UTF-8"));writer.write(Build_HttpBody(ListOfValues));writer.flush();writer.close();os.close();//开始请求conn.connect();int ResponseCode = conn.getResponseCode();如果(响应代码 == 200){is = conn.getInputStream();String EntityResult = ReadResponse_HttpURLConnection(is);}别的 {throw new RuntimeException("状态码无效");}}

<小时><块引用>

注意 DefaultHttpClient 类已弃用 (2011)

有关此链接的更多信息.

尝试使用以下代码，记住这种情况总是使用AsyncTask:

 私有类 Check_Loguin_Request 扩展了 AsyncTask {上下文 cx;字符串网址；列表BodyRequest_Elements;public Check_Loguin_Request(Context cx,String url, List ListOfValues){this.cx = cx;this.Url = url;this.BodyRequest_Elements = ListOfValues;}私有字符串 convertStreamToString(InputStream is) {BufferedReader reader = new BufferedReader(new InputStreamReader(is));StringBuilder sb = new StringBuilder();字符串行 = null;尝试 {while ((line = reader.readLine()) != null) {sb.append(line + "\n");}} catch (IOException e) {e.printStackTrace();} 最后 {尝试 {is.close();} catch (IOException e) {e.printStackTrace();}}返回 sb.toString();}@覆盖受保护的字符串 doInBackground(字符串...字符串){//声明变量DefaultHttpClient httpClient;HttpPost 请求 = 新的 HttpPost(url_Loguin);HttpResponse 响应；HttpParams httpParameters = new BasicHttpParams();httpParameters.setParameter(CoreProtocolPNames.PROTOCOL_VERSION, HttpVersion.HTTP_1_1);//以毫秒为单位设置超时，直到建立连接.//默认值为零，表示不使用超时.int timeoutConnection = 3000;HttpConnectionParams.setConnectionTimeout(httpParameters, timeoutConnection);//设置默认套接字超时(SO_TIMEOUT)//以毫秒为单位，这是等待数据的超时时间.int timeoutSocket = 5000;HttpConnectionParams.setSoTimeout(httpParameters, timeoutSocket);httpClient = new DefaultHttpClient(httpParameters);尝试 {HttpEntity entity = new UrlEncodedFormEntity(BodyRequest_Elements);Request.setHeader(entity.getContentType());Request.setEntity(实体);响应 = httpClient.execute(Request);if(Response.getStatusLine().getStatusCode() == 200){String EntityResult = EntityUtils.toString(Response.getEntity());//HttpEntity EntityResult = Response.getEntity();//InputStream iStream = EntityResult.getContent();//JSONObject json = new JSONObject(convertStreamToString(iStream));EntityResult = EntityResult.replaceAll("[()]", "");JSONObject json = new JSONObject(EntityResult);String 结果 = json.optString("code").toString();返回结果；}别的{throw new RuntimeException("状态码无效");}}捕获(异常前){Log.getStackTraceString(ex);返回 ex.toString();}}}

I develop AndroidApps with AndroidStudio I start to do a simple HttpPost Request and I had a problems, all post that I could find do this:

private void CheckLoguin_Request(String User, String Pass){

    //Declaration of variables
    HttpClient httpClient = new DefaultHttpClient();
    HttpPost Request = new HttpPost(url_Loguin);
    HttpResponse Response;

    List<NameValuePair> BodyRequest_Elements = new ArrayList<NameValuePair>();
    BodyRequest_Elements.add(new BasicNameValuePair("user_name", User));
    BodyRequest_Elements.add(new BasicNameValuePair("user_passwd", Pass));

    Request.setEntity(new UrlEncodedFormEntity(BodyRequest_Elements));
    Response = httpClient.execute(Request);

    // writing response to log
    Log.d("Http Response:", Response.toString());
}

But when I try to debugg App Android Studio give me a 2 errors in this lines:

 new UrlEncodedFormEntity(BodyRequest_Elements) //Error:(40, 27) error: unreported exception UnsupportedEncodingException; must be caught or declared to be thrown

 Response = httpClient.execute(Request); //Error:(41, 38) error: unreported exception IOException; must be caught or declared to be thrown

It's possible I need install more libraries or support libraries? What I do bad? Anyone can helps me? Thanks in advance and sorry for my English!

PD1: If you need more info or code advise me!

解决方案

Updated 2016

Using HttpURLConnection class we need to open BufferedWritter to insert our entity values as the following code:

//Declaration of variables
private List<NameValuePair> ListOfValues;
...

public Check_Loguin_Request(Context cx,String url, List<NameValuePair> ListOfValues)
{
    this.cx = cx;
    this.Url = url;
    this.ListOfValues= ListOfValues;
}

@Override
protected String doInBackground(String... strings) {

    //Declaration of variables
    InputStream is = null;
    String Result = "";

    URL urll = new URL(url);
    HttpURLConnection conn = (HttpURLConnection) urll.openConnection();
    conn.setReadTimeout(10000);
    conn.setConnectTimeout(15000);
    conn.setRequestMethod("POST");
    conn.setDoInput(true);
    conn.setDoOutput(true);

    OutputStream os = conn.getOutputStream();
    BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(os, "UTF-8"));
    writer.write(Build_HttpBody(ListOfValues));
    writer.flush();
    writer.close();
    os.close();

    // Starts request
    conn.connect();
    int ResponseCode = conn.getResponseCode();

    if (ResponseCode == 200) {
        is = conn.getInputStream();
        String EntityResult = ReadResponse_HttpURLConnection(is);
    } 
    else {
        throw new RuntimeException("Invalid Status Code");
    }
}

---

Attention the DefaultHttpClient class is deprecated (2011)

For more info following this link.

Try to use this following code, remember for this case always use AsyncTask:

 private class Check_Loguin_Request extends AsyncTask <String,Void,String>{

    Context cx;
    String Url;
    List<NameValuePair> BodyRequest_Elements;

    public Check_Loguin_Request(Context cx,String url, List<NameValuePair> ListOfValues)
    {
        this.cx = cx;
        this.Url = url;
        this.BodyRequest_Elements = ListOfValues;
    }

    private String convertStreamToString(InputStream is) {

        BufferedReader reader = new BufferedReader(new InputStreamReader(is));
        StringBuilder sb = new StringBuilder();

        String line = null;
        try {
            while ((line = reader.readLine()) != null) {
                sb.append(line + "\n");
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                is.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return sb.toString();
    }

    @Override
    protected String doInBackground(String... strings) {

        //Declaration of variables
        DefaultHttpClient httpClient;
        HttpPost Request = new HttpPost(url_Loguin);
        HttpResponse Response;
        HttpParams httpParameters = new BasicHttpParams();
        httpParameters.setParameter(CoreProtocolPNames.PROTOCOL_VERSION, HttpVersion.HTTP_1_1);

        // Set the timeout in milliseconds until a connection is established.
        // The default value is zero, that means the timeout is not used.
        int timeoutConnection = 3000;
        HttpConnectionParams.setConnectionTimeout(httpParameters, timeoutConnection);
        // Set the default socket timeout (SO_TIMEOUT)
        // in milliseconds which is the timeout for waiting for data.
        int timeoutSocket = 5000;
        HttpConnectionParams.setSoTimeout(httpParameters, timeoutSocket);
        httpClient = new DefaultHttpClient(httpParameters);


        try {
            HttpEntity entity = new UrlEncodedFormEntity(BodyRequest_Elements);
            Request.setHeader(entity.getContentType());
            Request.setEntity(entity);

            Response = httpClient.execute(Request);

            if(Response.getStatusLine().getStatusCode() == 200){
                String EntityResult = EntityUtils.toString(Response.getEntity());
                //HttpEntity EntityResult = Response.getEntity();
                //InputStream iStream = EntityResult.getContent();
                //JSONObject json = new JSONObject(convertStreamToString(iStream));

                EntityResult = EntityResult.replaceAll("[()]", "");
                JSONObject json = new JSONObject(EntityResult);

                String Result = json.optString("code").toString();
                return Result;
            }
            else{
                throw new RuntimeException("Invalid Status Code");
            }
        }
        catch (Exception ex){
            Log.getStackTraceString(ex);
            return ex.toString();
        }
    }
}

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