How To Do This In Java

Phantom · July 20, 2021, 4:16am

Hi Guys How To Do This In Java
blocks

vknow360 · July 20, 2021, 4:44am

What have you tried?

Phantom · July 20, 2021, 4:54am

I Tried It I Is Not Working

Phantom · July 20, 2021, 4:55am

And I Need Help With Posting In Web In JAVA

I Tried It But I Don’t Know How Read The Response

vknow360 · July 20, 2021, 5:16am

Good luck with your journey.

Phantom · July 20, 2021, 5:24am

can you help me out with this

Xoma · July 20, 2021, 5:50am

For GET request:

For POST request:

Phantom · July 20, 2021, 6:05am

@Xoma Started Compiling Project WebPost
Buildfile: /compiler/android/build.xml

javac:
[mkdir] Created dir: /compiler/android/build/dPXpo/classes
[javac] Compiling 1 source file to /compiler/android/build/dPXpo/classes
[javac] warning: [options] bootstrap class path not set in conjunction with -source 1.7
[javac] Note: Wrote file file:/compiler/android/build/dPXpo/classes/simple_components.json
[javac] Note: Wrote file file:/compiler/android/build/dPXpo/classes/simple_components.txt
[javac] Note: Wrote file file:/compiler/android/build/dPXpo/classes/simple_components_build_info.json
[javac] Note: Wrote file file:/compiler/android/build/dPXpo/classes/AutogeneratedOdeMessages.java
[javac] Note: Wrote file file:/compiler/android/build/dPXpo/classes/ComponentsTranslation.java
[javac] /compiler/android/src/dPXpo/com/web/post/WebPost.java:46: error: unreported exception MalformedURLException; must be caught or declared to be thrown
[javac] URL obj = new URL(“https://www.google.com”);
[javac] ^
[javac] /compiler/android/src/dPXpo/com/web/post/WebPost.java:47: error: unreported exception IOException; must be caught or declared to be thrown
[javac] HttpURLConnection httpConnection = (HttpURLConnection)obj.openConnection();
[javac] ^
[javac] /compiler/android/src/dPXpo/com/web/post/WebPost.java:49: error: unreported exception ProtocolException; must be caught or declared to be thrown
[javac] httpConnection.setRequestMethod(“POST”); //request method
[javac] ^
[javac] /compiler/android/src/dPXpo/com/web/post/WebPost.java:51: error: unreported exception IOException; must be caught or declared to be thrown
[javac] if (httpConnection.getResponseCode() == 200) {
[javac] ^
[javac] /compiler/android/src/dPXpo/com/web/post/WebPost.java:52: error: unreported exception IOException; must be caught or declared to be thrown
[javac] bufferedReader = new BufferedReader(new InputStreamReader(httpConnection.getInputStream()));
[javac] ^
[javac] /compiler/android/src/dPXpo/com/web/post/WebPost.java:58: error: unreported exception IOException; must be caught or declared to be thrown
[javac] while ((line = bufferedReader.readLine()) != null){
[javac] ^
[javac] /compiler/android/src/dPXpo/com/web/post/WebPost.java:61: error: unreported exception IOException; must be caught or declared to be thrown
[javac] bufferedReader.close();
[javac] ^
[javac] 7 errors

Xoma · July 20, 2021, 6:06am

Use try-catch or add an IO Exception.

Phantom · July 20, 2021, 6:24am

@SimpleFunction(description = "b")
    public void TestFunction(){ try
          URL obj = new URL("https://www.google.com");
      HttpURLConnection httpConnection = (HttpURLConnection)obj.openConnection();
      httpConnection.setDoOutput(true); //if you want output
      httpConnection.setRequestMethod("POST"); //request method
      BufferedReader bufferedReader = null;
      if (httpConnection.getResponseCode() == 200) {
        bufferedReader = new BufferedReader(new InputStreamReader(httpConnection.getInputStream()));
      } else {
        bufferedReader = new BufferedReader(new InputStreamReader(httpConnection.getErrorStream()));
      } 
      StringBuilder content = new StringBuilder();
      String line;
      while ((line = bufferedReader.readLine()) != null){
        content.append(line).append("\n"); 
      }
      bufferedReader.close();
      final String con = String.valueOf(content); //post wherever you need

Imports


import android.app.Activity;
import android.content.Context;
import com.google.appinventor.components.annotations.*;
import com.google.appinventor.components.common.ComponentCategory;
import com.google.appinventor.components.runtime.AndroidNonvisibleComponent;
import com.google.appinventor.components.runtime.ComponentContainer;
import com.google.appinventor.components.runtime.EventDispatcher;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;

Error

Started Compiling Project WebPost
Buildfile: /compiler/android/build.xml

javac:
[mkdir] Created dir: /compiler/android/build/oQpjH/classes
[javac] Compiling 1 source file to /compiler/android/build/oQpjH/classes
[javac] warning: [options] bootstrap class path not set in conjunction with -source 1.7
[javac] /compiler/android/src/oQpjH/com/web/post/WebPost.java:45: error: ‘{’ expected
[javac] public void TestFunction(){ try
[javac] ^
[javac] /compiler/android/src/oQpjH/com/web/post/WebPost.java:45: error: ‘try’ without ‘catch’, ‘finally’ or resource declarations
[javac] public void TestFunction(){ try
[javac] ^
[javac] /compiler/android/src/oQpjH/com/web/post/WebPost.java:65: error: reached end of file while parsing
[javac] }
[javac] ^
[javac] 3 errors
[javac] 1 warning

Phantom · July 20, 2021, 6:27am

full code

package com.web.post;

import android.app.Activity;

import android.content.Context;

import com.google.appinventor.components.annotations.*;

import com.google.appinventor.components.common.ComponentCategory;

import com.google.appinventor.components.runtime.AndroidNonvisibleComponent;

import com.google.appinventor.components.runtime.ComponentContainer;

import com.google.appinventor.components.runtime.EventDispatcher;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.OutputStream;

import java.net.HttpURLConnection;

import java.net.URL;

@DesignerComponent(

        version = 1,

        description = "",

        category = ComponentCategory.EXTENSION,

        nonVisible = true,

        iconName = "")

@SimpleObject(external = true)

//Libraries

@UsesLibraries(libraries = "")

//Permissions

@UsesPermissions(permissionNames = "")

public class WebPost extends AndroidNonvisibleComponent {

    //Activity and Context

    private Context context;

    private Activity activity;

    public WebPost(ComponentContainer container){

        super(container.$form());

        this.activity = container.$context();

        this.context = container.$context();

    }

    @SimpleFunction(description = "b")

    public void TestFunction(){ try-catch

          URL obj = new URL("https://www.google.com");

      HttpURLConnection httpConnection = (HttpURLConnection)obj.openConnection();

      httpConnection.setDoOutput(true); //if you want output

      httpConnection.setRequestMethod("POST"); //request method

      BufferedReader bufferedReader = null;

      if (httpConnection.getResponseCode() == 200) {

        bufferedReader = new BufferedReader(new InputStreamReader(httpConnection.getInputStream()));

      } else {

        bufferedReader = new BufferedReader(new InputStreamReader(httpConnection.getErrorStream()));

      } 

      StringBuilder content = new StringBuilder();

      String line;

      while ((line = bufferedReader.readLine()) != null){

        content.append(line).append("\n"); 

      }

      bufferedReader.close();

      final String con = String.valueOf(content); //post wherever you need

    }

}

Phantom · July 20, 2021, 6:29am

@Xoma what should i do now

Raja_HarshVardhanSolanki · July 20, 2021, 6:36am

This is not the right method

try{}
catch{}

Developers need to use it to catch Any error

Like This

try{your code to run}
catch(Exception e){
e.printStackTrace();
}

try is where your code run in.
catch is what that catch errors in your code wrote in try block.

Phantom · July 20, 2021, 6:45am

Error

Started Compiling Project WebPost
Buildfile: /compiler/android/build.xml

javac:
[mkdir] Created dir: /compiler/android/build/NDVGR/classes
[javac] Compiling 1 source file to /compiler/android/build/NDVGR/classes
[javac] warning: [options] bootstrap class path not set in conjunction with -source 1.7
[javac] /compiler/android/src/NDVGR/com/web/post/WebPost.java:45: error: ';' expected
[javac] public void TestFunction()try{
[javac] ^
[javac] /compiler/android/src/NDVGR/com/web/post/WebPost.java:65: error: illegal start of type
[javac] catch(Exception e){
[javac] ^
[javac] 2 errors
[javac] 1 warning

Code

import android.app.Activity;
import android.content.Context;
import com.google.appinventor.components.annotations.*;
import com.google.appinventor.components.common.ComponentCategory;
import com.google.appinventor.components.runtime.AndroidNonvisibleComponent;
import com.google.appinventor.components.runtime.ComponentContainer;
import com.google.appinventor.components.runtime.EventDispatcher;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;


@DesignerComponent(
        version = 1,
        description = "",
        category = ComponentCategory.EXTENSION,
        nonVisible = true,
        iconName = "")

@SimpleObject(external = true)
//Libraries
@UsesLibraries(libraries = "")
//Permissions
@UsesPermissions(permissionNames = "")

public class WebPost extends AndroidNonvisibleComponent {

    //Activity and Context
    private Context context;
    private Activity activity;

    public WebPost(ComponentContainer container){
        super(container.$form());
        this.activity = container.$context();
        this.context = container.$context();
    }

    @SimpleFunction(description = "b")
    public void TestFunction()try{
          URL obj = new URL("https://www.google.com");
      HttpURLConnection httpConnection = (HttpURLConnection)obj.openConnection();
      httpConnection.setDoOutput(true); //if you want output
      httpConnection.setRequestMethod("POST"); //request method
      BufferedReader bufferedReader = null;
      if (httpConnection.getResponseCode() == 200) {
        bufferedReader = new BufferedReader(new InputStreamReader(httpConnection.getInputStream()));
      } else {
        bufferedReader = new BufferedReader(new InputStreamReader(httpConnection.getErrorStream()));
      } 
      StringBuilder content = new StringBuilder();
      String line;
      while ((line = bufferedReader.readLine()) != null){
        content.append(line).append("\n"); 
      }
      bufferedReader.close();
      final String con = String.valueOf(content); //post wherever you need
      
    }
    catch(Exception e){
    e.printStackTrace();
    }
}

@Raja_HarshVardhanSolanki i got this error

iamwsumit · July 20, 2021, 6:50am

You missed a braces here. It should be public void TestFunction(){.
Also try and catch is not enough for that. You need to use the thread for it. A example is here for sending a get request to URL.

github.com

Sumit1334/Currency-Converter/blob/75c5c4c4fa2182b6be70f8977ff8e55edcd5d263/com/Sumit1334/CurrencyConverter/CurrencyConverter.java#L83

    
      
          public void To(String to){

              this.to=to;

          }

          @DesignerProperty(editorType = "String",defaultValue = "USD")

          @SimpleProperty(description = "Set the currency type from that you want to get the prize")

          public void From(String to){

              this.from=to;

          }

          

          

          public class getprize extends Thread {

              int am=amount;

              private void get() {

                  String status="Getting data";

                  

              }

          

              public void run() {

                  try {

                      URL url=new URL(CurrencyConverter.url);

                      HttpURLConnection h= (HttpURLConnection) url.openConnection();

Raja_HarshVardhanSolanki · July 20, 2021, 7:04am

try function only run in a method.

try this:

public void TestFunction(){
try{***}

catch{***}
}

Phantom · July 20, 2021, 7:07am

how to show the data

Data(httpConnection.getInputStream());

full code

import android.app.Activity;

import android.content.Context;

import com.google.appinventor.components.annotations.*;

import com.google.appinventor.components.common.ComponentCategory;

import com.google.appinventor.components.runtime.AndroidNonvisibleComponent;

import com.google.appinventor.components.runtime.ComponentContainer;

import com.google.appinventor.components.runtime.EventDispatcher;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.OutputStream;

import java.net.HttpURLConnection;

import java.net.URL;

@DesignerComponent(

        version = 1,

        description = "",

        category = ComponentCategory.EXTENSION,

        nonVisible = true,

        iconName = "")

@SimpleObject(external = true)

//Libraries

@UsesLibraries(libraries = "")

//Permissions

@UsesPermissions(permissionNames = "")

public class WebPost extends AndroidNonvisibleComponent {

    //Activity and Context

    private Context context;

    private Activity activity;

    public WebPost(ComponentContainer container){

        super(container.$form());

        this.activity = container.$context();

        this.context = container.$context();

    }

    @SimpleFunction(description = "b")

   public void run() {

            try {

          URL obj = new URL("https://www.google.com");

      HttpURLConnection httpConnection = (HttpURLConnection)obj.openConnection();

      httpConnection.setDoOutput(true); //if you want output

      httpConnection.setRequestMethod("POST"); //request method

      BufferedReader bufferedReader = null;

      if (httpConnection.getResponseCode() == 200) {

        bufferedReader = new BufferedReader(new InputStreamReader(httpConnection.getInputStream()));

        Data(httpConnection.getInputStream());

      } else {

        bufferedReader = new BufferedReader(new InputStreamReader(httpConnection.getErrorStream()));

      } 

      StringBuilder content = new StringBuilder();

      String line;

      while ((line = bufferedReader.readLine()) != null){

        content.append(line).append("\n"); 

      }

      bufferedReader.close();

      final String con = String.valueOf(content); //post wherever you need

      

    }

    catch(Exception e){

    e.printStackTrace();

    }

   }

}

Phantom · July 20, 2021, 7:12am

This is the error

Started Compiling Project WebPost
Buildfile: /compiler/androidX/build.xml

javac:
[mkdir] Created dir: /compiler/androidX/build/Qlqhp/classes
[javac] Compiling 1 source file to /compiler/androidX/build/Qlqhp/classes
[javac] warning: [options] bootstrap class path not set in conjunction with -source 1.7
[javac] Note: Wrote file file:/compiler/androidX/build/Qlqhp/classes/simple_components.json
[javac] Note: Wrote file file:/compiler/androidX/build/Qlqhp/classes/simple_components.txt
[javac] Note: Wrote file file:/compiler/androidX/build/Qlqhp/classes/simple_components_build_info.json
[javac] Note: Wrote file file:/compiler/androidX/build/Qlqhp/classes/AutogeneratedOdeMessages.java
[javac] Note: Wrote file file:/compiler/androidX/build/Qlqhp/classes/ComponentsTranslation.java
[javac] /compiler/androidX/src/Qlqhp/com/web/post/WebPost.java:54: error: cannot find symbol
[javac] Data(httpConnection.getInputStream());
[javac] ^
[javac] symbol: method Data(InputStream)
[javac] location: class WebPost
[javac] 1 error

@Raja_HarshVardhanSolanki @iamwsumit ???
what is the mistake

iamwsumit · July 20, 2021, 7:27am

Have you made Data event in your code? If not then you need to make it.
One more thing you should to do to get the data
Use

Data(bufferedReader.readLine()) ;

Instead of passing input stream to the param.

Raja_HarshVardhanSolanki · July 20, 2021, 7:33am

From where you call this Data function.