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こんにちは私はAndroid開発にはとても新しいです。 JSPを使用してAndroidデータベースとMySQLデータベースを接続することに問題があります。 私はたくさんの文書を読みましたが、この問題の解決方法はわかりません。 私はよく分かりませんが、問題はヌルポインタの問題に関連していると思います。 しかし、私はそれがどこにあるのかわかりません.....Android-JSP org.json.JSONException:値<!java.lang.String型のDOCTYPEをJSONObjectに変換できません
これは私のJavaコードです。
メインActivity.java
package com.example.user.nacho_http_connection_test;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.StrictMode;
import android.util.Log;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;
import com.google.android.gms.appindexing.AppIndex;
import com.google.android.gms.common.api.GoogleApiClient;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.BufferedReader;
import java.io.InputStreamReader;
public class MainActivity extends Activity {
EditText edit_id, edit_pw;
/**
* ATTENTION: This was auto-generated to implement the App Indexing API.
* See https://g.co/AppIndexing/AndroidStudio for more information.
*/
private GoogleApiClient client;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
edit_id = (EditText) findViewById(R.id.login_id);
edit_pw = (EditText) findViewById(R.id.login_pw);
// ATTENTION: This was auto-generated to implement the App Indexing API.
// See https://g.co/AppIndexing/AndroidStudio for more information.
client = new GoogleApiClient.Builder(this).addApi(AppIndex.API).build();
}
public void join_btn(View view) {
Intent intent;
intent = new Intent(this, LoginActivity.class);
startActivity(intent);
finish();
}
public void login_btn(View view) {
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
String sMessage = edit_id.getText().toString();
String result = SendByHttp(sMessage);
String[][] parsedData = jsonParserList(result);
if (parsedData[0][0].equals("succed")) {
Toast.makeText(MainActivity.this, "Login Success", Toast.LENGTH_LONG).show();
Intent intent = new Intent(this, LoginActivity.class);
startActivity(intent);
finish();
}
}
private String SendByHttp(String msg) {
if (msg == null) {
msg = "";
}
String URL = "http://IP address/Test_Json/User.jsp";
DefaultHttpClient client = new DefaultHttpClient();
try {
HttpPost post = new HttpPost(URL + "?id=" + edit_id.getText().toString()+"&pw="+edit_pw.getText().toString());
HttpResponse response = client.execute(post);
BufferedReader bufreader = new BufferedReader(new InputStreamReader(response.getEntity().getContent(), "utf-8"));
String line = null;
String result = "";
while ((line = bufreader.readLine()) != null) {
result += line;
}
return result;
} catch (Exception e) {
e.printStackTrace();
client.getConnectionManager().shutdown();
return "";
}
}
public String[][] jsonParserList(String pRecvServerPage){
Log.i("whole content from Server", pRecvServerPage);
try{
JSONObject json = new JSONObject(pRecvServerPage);
JSONArray jArr = json.getJSONArray("List");
String[] jsonName = {"msg1","msg2","msg3"};
String[][] parseredData = new String[jArr.length()][jsonName.length];
for(int i = 0; i<jArr.length();i++){
json = jArr.getJSONObject(i);
for (int j=0;j<jsonName.length; j++){
parseredData[i][j] = json.getString(jsonName[j]);
}
}
for(int i=0;i<parseredData.length;i++)
{
Log.i("Analyzed JSON Data"+i+":",parseredData[i][0]);
Log.i("Analyzed JSON Data"+i+":",parseredData[i][1]);
Log.i("Analyzed JSON Data"+i+":",parseredData[i][2]);
}
return parseredData;
}catch (JSONException e){
e.printStackTrace();
return null;
}
}
}
User.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8" import = "org.json.simple.*"%>
<%@ page import ="java.sql.*" %>
<%
String id = request.getParameter("id");
String pw = request.getParameter("pw");
JSONObject jsonMain = new JSONObject();
JSONArray jArray = new JSONArray();
JSONObject jObject = new JSONObject();
Class.forName("com.mysql.jdbc.Driver");
try{
Connection conn = DriverManager.getConnection(
"jdbc:mysql://IP address/dbname", "admin", "1234");
Statement stmt = conn.createStatement();
String query = "select * from MEMBER";
ResultSet rs = stmt.executeQuery(query);
int i =0;
while(rs.next())
{
String _id = rs.getString("id");
String _pw = rs.getString("pw");
if(id.equals(_id)&&pw.equals(_pw)){
i =1;
jObject.put("msg1", "succed");
jObject.put("msg2", "two");
jObject.put("msg3", "three");
}
}
if(i==0){
jObject.put("msg1", "failed");
jObject.put("msg2", "two");
jObject.put("msg3", "three");
}
stmt.close();
conn.close();
jArray.add(0,jObject);
jsonMain.put("List",jArray);
out.println(jsonMain.toJSONString());
}catch(Exception e){
}
%>
Logcat
05-03 09:10:48.031 3982-3982/com.example.user.nacho_http_connection_test I/whole content from Server: <!DOCTYPE html><html><head><title>Apache Tomcat/8.0.33 - Error report</title><style type="text/css">H1 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:22px;} H2 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:16px;} H3 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:14px;} BODY {font-family:Tahoma,Arial,sans-serif;color:black;background-color:white;} B {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;} P {font-family:Tahoma,Arial,sans-serif;background:white;color:black;font-size:12px;}A {color : black;}A.name {color : black;}.line {height: 1px; background-color: #525D76; border: none;}</style> </head><body><h1>HTTP Status 404 - /Test_Json/User.jsp</h1><div class="line"></div><p><b>type</b> Status report</p><p><b>message</b> <u>/Test_Json/User.jsp</u></p><p><b>description</b> <u>The requested resource is not available.</u></p><hr class="line"><h3>Apache Tomcat/8.0.33</h3></body></html>
05-03 09:10:48.031 3982-3982/com.example.user.nacho_http_connection_test W/System.err: org.json.JSONException: Value <!DOCTYPE of type java.lang.String cannot be converted to JSONObject
05-03 09:10:48.031 3982-3982/com.example.user.nacho_http_connection_test W/System.err: at org.json.JSON.typeMismatch(JSON.java:111)
05-03 09:10:48.031 3982-3982/com.example.user.nacho_http_connection_test W/System.err: at org.json.JSONObject.<init>(JSONObject.java:160)
05-03 09:10:48.031 3982-3982/com.example.user.nacho_http_connection_test W/System.err: at org.json.JSONObject.<init>(JSONObject.java:173)
05-03 09:10:48.031 3982-3982/com.example.user.nacho_http_connection_test W/System.err: at com.example.user.nacho_http_connection_test.MainActivity.jsonParserList(MainActivity.java:126)
05-03 09:10:48.031 3982-3982/com.example.user.nacho_http_connection_test W/System.err: at com.example.user.nacho_http_connection_test.MainActivity.login_btn(MainActivity.java:66)
05-03 09:10:48.031 3982-3982/com.example.user.nacho_http_connection_test W/System.err: at java.lang.reflect.Method.invoke(Native Method)
05-03 09:10:48.031 3982-3982/com.example.user.nacho_http_connection_test W/System.err: at java.lang.reflect.Method.invoke(Method.java:372)
05-03 09:10:48.031 3982-3982/com.example.user.nacho_http_connection_test W/System.err: at android.view.View$1.onClick(View.java:4015)
05-03 09:10:48.031 3982-3982/com.example.user.nacho_http_connection_test W/System.err: at android.view.View.performClick(View.java:4780)
05-03 09:10:48.031 3982-3982/com.example.user.nacho_http_connection_test W/System.err: at android.view.View$PerformClick.run(View.java:19866)
05-03 09:10:48.031 3982-3982/com.example.user.nacho_http_connection_test W/System.err: at android.os.Handler.handleCallback(Handler.java:739)
05-03 09:10:48.031 3982-3982/com.example.user.nacho_http_connection_test W/System.err: at android.os.Handler.dispatchMessage(Handler.java:95)
05-03 09:10:48.031 3982-3982/com.example.user.nacho_http_connection_test W/System.err: at android.os.Looper.loop(Looper.java:135)
05-03 09:10:48.031 3982-3982/com.example.user.nacho_http_connection_test W/System.err: at android.app.ActivityThread.main(ActivityThread.java:5254)
05-03 09:10:48.031 3982-3982/com.example.user.nacho_http_connection_test W/System.err: at java.lang.reflect.Method.invoke(Native Method)
05-03 09:10:48.031 3982-3982/com.example.user.nacho_http_connection_test W/System.err: at java.lang.reflect.Method.invoke(Method.java:372)
05-03 09:10:48.031 3982-3982/com.example.user.nacho_http_connection_test W/System.err: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
05-03 09:10:48.031 3982-3982/com.example.user.nacho_http_connection_test W/System.err: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
05-03 09:10:48.032 3982-3982/com.example.user.nacho_http_connection_test D/AndroidRuntime: Shutting down VM
--------- beginning of crash
05-03 09:10:48.032 3982-3982/com.example.user.nacho_http_connection_test E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.user.nacho_http_connection_test, PID: 3982
java.lang.IllegalStateException: Could not execute method of the activity
at android.view.View$1.onClick(View.java:4020)
at android.view.View.performClick(View.java:4780)
at android.view.View$PerformClick.run(View.java:19866)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at android.view.View$1.onClick(View.java:4015)
at android.view.View.performClick(View.java:4780)
at android.view.View$PerformClick.run(View.java:19866)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
Caused by: java.lang.NullPointerException: Attempt to read from null array
at com.example.user.nacho_http_connection_test.MainActivity.login_btn(MainActivity.java:75)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at android.view.View$1.onClick(View.java:4015)
at android.view.View.performClick(View.java:4780)
at android.view.View$PerformClick.run(View.java:19866)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
05-03 09:10:52.844 3982-3982/com.example.user.nacho_http_connection_test I/Process: Sending signal. PID: 3982 SIG: 9
任意の助けいただければ幸いです。
...私はそれについて行うことができますか?私はプロじゃありませんよ) –
ブラウザからURLを打つと何が得られますか? –
申し訳ありませんが遅いです。私はlogcatの最初の行に表示されるエラーページしか見ることができません。つまり、そのHTMLコードです。 –