如何从Android应用程序调用RESTful API（ASP.NET）？_Android_Asp.net_Json_Rest

如何从Android应用程序调用RESTful API（ASP.NET）？

android asp.net json rest

如何从Android应用程序调用RESTful API（ASP.NET）？,android,asp.net,json,rest,Android,Asp.net,Json,Rest,我遵循了这里的教程：使用ASP.NET创建RESTful API，一切都很好。在本教程结束时，我下载了一个ZIP文件，其中包含一个Java文件，其中包含对API中方法的调用问题是…我如何调用这些方法以便它们与我的web服务API交互？我真的很困惑，过去我在web服务器上使用PHP和插入/提取SQL数据做过类似的事情，但从未使用ASP.NET或类似的设置如果有帮助的话，下面是我在该教程结束时得到的Java文件的内容： public class RestAPI { private final S

我遵循了这里的教程：使用ASP.NET创建RESTful API，一切都很好。在本教程结束时，我下载了一个ZIP文件，其中包含一个Java文件，其中包含对API中方法的调用

问题是…我如何调用这些方法以便它们与我的web服务API交互？我真的很困惑，过去我在web服务器上使用PHP和插入/提取SQL数据做过类似的事情，但从未使用ASP.NET或类似的设置

如果有帮助的话，下面是我在该教程结束时得到的Java文件的内容：

public class RestAPI {
private final String urlString = "http://localhost:53749/Gen_Handler.ashx";

private static String convertStreamToUTF8String(InputStream stream) throws IOException {
    String result = "";
    StringBuilder sb = new StringBuilder();
    try {
        InputStreamReader reader = new InputStreamReader(stream, "UTF-8");
        char[] buffer = new char[4096];
        int readChars = 0;
        while (readChars != -1) {
            readChars = reader.read(buffer);
            if (readChars > 0)
               sb.append(buffer, 0, readChars);
        }
        result = sb.toString();
    } catch (UnsupportedEncodingException e) {
        e.printStackTrace();
    }
    return result;
}

private String load(String contents) throws IOException {
    URL url = new URL(urlString);
    HttpURLConnection conn = (HttpURLConnection)url.openConnection();
    conn.setRequestMethod("POST");
    conn.setConnectTimeout(60000);
    conn.setDoOutput(true);
    conn.setDoInput(true);
    OutputStreamWriter w = new OutputStreamWriter(conn.getOutputStream());
    w.write(contents);
    w.flush();
    InputStream istream = conn.getInputStream();
    String result = convertStreamToUTF8String(istream);
    return result;
}

private Object mapObject(Object o) {
    Object finalValue = null;
    if (o.getClass() == String.class) {
        finalValue = o;
    }
    else if (Number.class.isInstance(o)) {
        finalValue = String.valueOf(o);
    } else if (Date.class.isInstance(o)) {
        SimpleDateFormat sdf = new SimpleDateFormat("MM/dd/yyyy hh:mm:ss", new Locale("en", "USA"));
        finalValue = sdf.format((Date)o);
    }
    else if (Collection.class.isInstance(o)) {
        Collection<?> col = (Collection<?>) o;
        JSONArray jarray = new JSONArray();
        for (Object item : col) {
            jarray.put(mapObject(item));
        }
        finalValue = jarray;
    } else {
        Map<String, Object> map = new HashMap<String, Object>();
        Method[] methods = o.getClass().getMethods();
        for (Method method : methods) {
            if (method.getDeclaringClass() == o.getClass()
                    && method.getModifiers() == Modifier.PUBLIC
                    && method.getName().startsWith("get")) {
                String key = method.getName().substring(3);
                try {
                    Object obj = method.invoke(o, null);
                    Object value = mapObject(obj);
                    map.put(key, value);
                    finalValue = new JSONObject(map);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }
    }
    return finalValue;
}

public JSONObject CreateNewAccount(String firstName,String lastName,String userName,String password) throws Exception {
    JSONObject result = null;
    JSONObject o = new JSONObject();
    JSONObject p = new JSONObject();
    o.put("interface","RestAPI");
    o.put("method", "CreateNewAccount");
    p.put("firstName",mapObject(firstName));
    p.put("lastName",mapObject(lastName));
    p.put("userName",mapObject(userName));
    p.put("password",mapObject(password));
    o.put("parameters", p);
    String s = o.toString();
    String r = load(s);
    result = new JSONObject(r);
    return result;
}

public JSONObject GetUserDetails(String userName) throws Exception {
    JSONObject result = null;
    JSONObject o = new JSONObject();
    JSONObject p = new JSONObject();
    o.put("interface","RestAPI");
    o.put("method", "GetUserDetails");
    p.put("userName",mapObject(userName));
    o.put("parameters", p);
    String s = o.toString();
    String r = load(s);
    result = new JSONObject(r);
    return result;
}

public JSONObject UserAuthentication(String userName,String passsword) throws Exception {
    JSONObject result = null;
    JSONObject o = new JSONObject();
    JSONObject p = new JSONObject();
    o.put("interface","RestAPI");
    o.put("method", "UserAuthentication");
    p.put("userName",mapObject(userName));
    p.put("passsword",mapObject(passsword));
    o.put("parameters", p);
    String s = o.toString();
    String r = load(s);
    result = new JSONObject(r);
    return result;
}

public JSONObject GetDepartmentDetails() throws Exception {
    JSONObject result = null;
    JSONObject o = new JSONObject();
    JSONObject p = new JSONObject();
    o.put("interface","RestAPI");
    o.put("method", "GetDepartmentDetails");
    o.put("parameters", p);
    String s = o.toString();
    String r = load(s);
    result = new JSONObject(r);
    return result;
}
}

注意：displaySafeMessage（）方法是从一个按钮onClick（）调用的，我没有包含该方法。Android中没有此代码的错误，但也没有返回任何内容，我在Departments表中有值，如SQL查询所示

我知道我错过了一件大事，所以请告诉我是什么！

谢谢

您需要在AsycTask类中调用该方法。将URL字符串值更改为

”http://10.0.2.2:53749/Gen_Handler.ashx";

通过仿真器访问它。要通过真正的android设备访问API，您需要在公共托管空间中托管API。

使用下面的代码调用.net restful webservice

import android.content.Context;

import com.ayconsultancy.sumeshmedicals.R;
import com.ayconsultancy.sumeshmedicals.utils.Utils;

import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;

/**
 * Created by Admin33 on 30-12-2015.
 */
public class RestClient {
    //  static String ip = "http://192.168.1.220/SmartCure/api/";
    static Context context;
    private static int responseCode;
    private static String response;

    public static String getResponse() {
        return response;
    }

    public static void setResponse(String response) {
        RestClient.response = response;
    }

    public static int getResponseCode() {
        return responseCode;
    }

    public static void setResponseCode(int responseCode) {
        RestClient.responseCode = responseCode;
    }

    public static void Execute(String requestMethod, String jsonData, String urlMethod, Context contextTemp, HashMap<String, Object> params) {
        try {
            context = contextTemp;
            String ip = context.getResources().getString(R.string.ip);
            StringBuilder urlString = new StringBuilder(ip + urlMethod);
            if (params != null) {
                for (Map.Entry<String, Object> para : params.entrySet()) {
                    if (para.getValue() instanceof Long) {
                        urlString.append("?" + para.getKey() + "=" +(Long)para.getValue());
                    }
                    if (para.getValue() instanceof String) {
                        urlString.append("?" + para.getKey() + "=" +String.valueOf(para.getValue()));
                    }
                }
            }

            URL url = new URL(urlString.toString());

            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setRequestMethod(requestMethod);
            conn.setReadTimeout(10000 /*milliseconds*/);
            conn.setConnectTimeout(15000 /* milliseconds */);


            switch (requestMethod) {
                case "POST" : case "PUT":
                    conn.setDoInput(true);
                    conn.setDoOutput(true);
                    conn.setRequestProperty("Content-Type", "application/json;charset=utf-8");
                    conn.setRequestProperty("X-Requested-With", "XMLHttpRequest");
                    conn.connect();
                    OutputStream os = new BufferedOutputStream(conn.getOutputStream());
                    os.write(jsonData.getBytes());
                    os.flush();
                    responseCode = conn.getResponseCode();
                    break;
                case "GET":
                    responseCode = conn.getResponseCode();
                    System.out.println("GET Response Code :: " + responseCode);
                    break;


            }
            if (responseCode == HttpURLConnection.HTTP_OK) { // success
                BufferedReader in = new BufferedReader(new InputStreamReader(
                        conn.getInputStream()));
                String inputLine;
                StringBuffer tempResponse = new StringBuffer();

                while ((inputLine = in.readLine()) != null) {
                    tempResponse.append(inputLine);
                }
                in.close();
                response = tempResponse.toString();
                System.out.println(response.toString());
            } else {
                System.out.println("GET request not worked");
            }
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

导入android.content.Context；
import com.ayconsultancy.sumeshmedicals.R；
导入com.ayconsultancy.sumeshmedicals.utils.utils；
导入java.io.BufferedOutputStream；
导入java.io.BufferedReader；
导入java.io.DataOutputStream；
导入java.io.IOException；
导入java.io.InputStreamReader；
导入java.io.OutputStream；
导入java.io.OutputStreamWriter；
导入java.net.HttpURLConnection；
导入java.net.URL；
导入java.util.HashMap；
导入java.util.Map；
/**
*由Admin33于2015年12月30日创建。
*/
公共类RestClient{
//静态字符串ip=”http://192.168.1.220/SmartCure/api/";
静态语境；
专用静态int响应码；
私有静态字符串响应；
公共静态字符串getResponse（）{
返回响应；
}
公共静态void setResponse（字符串响应）{
RestClient.response=响应；
}
公共静态int getResponseCode（）{
返回响应代码；
}
公共静态无效setResponseCode（int responseCode）{
RestClient.responseCode=responseCode；
}
公共静态void Execute（字符串requestMethod、字符串jsonData、字符串urlMethod、上下文contextTemp、HashMap参数）{
试一试{
context=contextTemp；
String ip=context.getResources（）.getString（R.String.ip）；
StringBuilder urlString=新的StringBuilder（ip+urlMethod）；
如果（参数！=null）{
对于（Map.Entry段落：params.entrySet（））{
if（para.getValue（）instanceof Long）{
追加（“？”+para.getKey（）+”=“+（长）para.getValue（））；
}
if（para.getValue（）instanceof String）{
urlString.append（“？”+para.getKey（）+“=”+String.valueOf（para.getValue（））；
}
}
}
URL=新URL（urlString.toString（））；
HttpURLConnection conn=（HttpURLConnection）url.openConnection（）；
conn.setRequestMethod（requestMethod）；
conn.setReadTimeout（10000/*毫秒*/）；
conn.setConnectTimeout（15000/*毫秒*/）；
开关（请求方法）{
案例“POST”：案例“PUT”：
conn.setDoInput（真）；
连接设置输出（真）；
conn.setRequestProperty（“内容类型”，“应用程序/json；字符集=utf-8”）；
conn.setRequestProperty（“X-request-With”，“XMLHttpRequest”）；
连接（）；
OutputStream os=新的BufferedOutputStream（conn.getOutputStream（））；
write（jsonData.getBytes（））；
os.flush（）；
responseCode=conn.getResponseCode（）；
打破
案例“GET”：
responseCode=conn.getResponseCode（）；
System.out.println（“获取响应代码：：”+响应代码）；
打破
}
如果（responseCode==HttpURLConnection.HTTP_OK）{//success
BufferedReader in=新的BufferedReader（新的InputStreamReader(
conn.getInputStream（））；
字符串输入线；
StringBuffer tempResponse=新的StringBuffer（）；
而（（inputLine=in.readLine（））！=null）{
tempResponse.append（inputLine）；
}
in.close（）；
response=tempResponse.toString（）；
System.out.println（response.toString（））；
}否则{
System.out.println（“获取请求未工作”）；
}
}捕获（IOE异常）{
e、 printStackTrace（）；
}
}

import android.content.Context;

import com.ayconsultancy.sumeshmedicals.R;
import com.ayconsultancy.sumeshmedicals.utils.Utils;

import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;

/**
 * Created by Admin33 on 30-12-2015.
 */
public class RestClient {
    //  static String ip = "http://192.168.1.220/SmartCure/api/";
    static Context context;
    private static int responseCode;
    private static String response;

    public static String getResponse() {
        return response;
    }

    public static void setResponse(String response) {
        RestClient.response = response;
    }

    public static int getResponseCode() {
        return responseCode;
    }

    public static void setResponseCode(int responseCode) {
        RestClient.responseCode = responseCode;
    }

    public static void Execute(String requestMethod, String jsonData, String urlMethod, Context contextTemp, HashMap<String, Object> params) {
        try {
            context = contextTemp;
            String ip = context.getResources().getString(R.string.ip);
            StringBuilder urlString = new StringBuilder(ip + urlMethod);
            if (params != null) {
                for (Map.Entry<String, Object> para : params.entrySet()) {
                    if (para.getValue() instanceof Long) {
                        urlString.append("?" + para.getKey() + "=" +(Long)para.getValue());
                    }
                    if (para.getValue() instanceof String) {
                        urlString.append("?" + para.getKey() + "=" +String.valueOf(para.getValue()));
                    }
                }
            }

            URL url = new URL(urlString.toString());

            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setRequestMethod(requestMethod);
            conn.setReadTimeout(10000 /*milliseconds*/);
            conn.setConnectTimeout(15000 /* milliseconds */);


            switch (requestMethod) {
                case "POST" : case "PUT":
                    conn.setDoInput(true);
                    conn.setDoOutput(true);
                    conn.setRequestProperty("Content-Type", "application/json;charset=utf-8");
                    conn.setRequestProperty("X-Requested-With", "XMLHttpRequest");
                    conn.connect();
                    OutputStream os = new BufferedOutputStream(conn.getOutputStream());
                    os.write(jsonData.getBytes());
                    os.flush();
                    responseCode = conn.getResponseCode();
                    break;
                case "GET":
                    responseCode = conn.getResponseCode();
                    System.out.println("GET Response Code :: " + responseCode);
                    break;


            }
            if (responseCode == HttpURLConnection.HTTP_OK) { // success
                BufferedReader in = new BufferedReader(new InputStreamReader(
                        conn.getInputStream()));
                String inputLine;
                StringBuffer tempResponse = new StringBuffer();

                while ((inputLine = in.readLine()) != null) {
                    tempResponse.append(inputLine);
                }
                in.close();
                response = tempResponse.toString();
                System.out.println(response.toString());
            } else {
                System.out.println("GET request not worked");
            }
        } catch (IOException e) {
            e.printStackTrace();
        }

    }