Java 如何修复org.json.JSONException:on-Volley?
我正在通过php(web)连接开发android登录Java 如何修复org.json.JSONException:on-Volley?,java,android,json,httprequest,android-volley,Java,Android,Json,Httprequest,Android Volley,我正在通过php(web)连接开发android登录 StringRequest stringRequest=new StringRequest(Request.Method.POST, URL_LOGIN, new Response.Listener<String>() { @Override public void onResponse(String r
StringRequest stringRequest=new StringRequest(Request.Method.POST, URL_LOGIN,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
try {
JSONObject jsonObject=new JSONObject(response);
String success = jsonObject.getString("success");
JSONArray jsonArray=jsonObject.getJSONArray("login");
if (success.equals("1")) {
for (int i=0; i<jsonArray.length();i++){
JSONObject object = jsonArray.getJSONObject(i);
String name = object.getString("name").trim();
String email=object.getString( "email").trim();
Toast.makeText(LoginActivity.this,
"Success Login. \nYour Name : "
+name+"\nYour Email : "
+email, Toast.LENGTH_SHORT)
.show();
loading.setVisibility(View.GONE);
}
}
} catch (JSONException e) {
e.printStackTrace();
loading.setVisibility(View.GONE);
btn_login.setVisibility(View.VISIBLE);
Toast.makeText(LoginActivity.this, "Error!!! " +e.toString(),
Toast.LENGTH_SHORT).show();
}
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(LoginActivity.this, "Error!! " +error.toString(),
Toast.LENGTH_SHORT).show();
}
})
{
@Override
protected Map<String, String> getParams() throws AuthFailureError {
Map<String, String> params = new HashMap<>();
params.put("email", email);
params.put("password", password);
return params;
}
};
RequestQueue requestQueue = Volley.newRequestQueue(this);
requestQueue.add(stringRequest);
}
}
代码
package com.example.salmakhalil.myapplication;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;
import com.android.volley.AuthFailureError;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.HashMap;
import java.util.Map;
public class LoginActivity extends AppCompatActivity {
private EditText email,password;
private Button btn_login;
private TextView link_regist;
private ProgressBar loading;
private static String URL_LOGIN="http://192.168.8.101/android_register_login/login.php";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
loading=findViewById(R.id.loading);
email=findViewById(R.id.email);
password=findViewById(R.id.password);
btn_login=findViewById(R.id.btn_login);
link_regist=findViewById(R.id.link_regist);
btn_login.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String mEmail=email.getText().toString().trim();
String mPass=password.getText().toString().trim();
if (!mEmail.isEmpty() || !mPass.isEmpty()){
Login(mEmail,mPass);
}
else {
email.setError("Please insert email");
password.setError("Please insert Password");
}
}
});
link_regist.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
startActivity(new Intent(LoginActivity.this, MainActivity.class));
}
});
}
private void Login(String email, String password){
loading.setVisibility(View.VISIBLE);
btn_login.setVisibility(View.GONE);
StringRequest stringRequest=new StringRequest(Request.Method.POST, URL_LOGIN,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
try {
JSONObject jsonObject=new JSONObject(response);
String success = jsonObject.getString("success");
JSONArray jsonArray=jsonObject.getJSONArray("login");
if (success.equals("1")) {
for (int i=0; i<jsonArray.length();i++){
JSONObject object = jsonArray.getJSONObject(i);
String name = object.getString("name").trim();
String email=object.getString( "email").trim();
Toast.makeText(LoginActivity.this,
"Success Login. \nYour Name : "
+name+"\nYour Email : "
+email, Toast.LENGTH_SHORT)
.show();
loading.setVisibility(View.GONE);
}
}
} catch (JSONException e) {
e.printStackTrace();
loading.setVisibility(View.GONE);
btn_login.setVisibility(View.VISIBLE);
Toast.makeText(LoginActivity.this, "Error!!! " +e.toString(),
Toast.LENGTH_SHORT).show();
}
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(LoginActivity.this, "Error!! " +error.toString(),
Toast.LENGTH_SHORT).show();
}
})
{
@Override
protected Map<String, String> getParams() throws AuthFailureError {
Map<String, String> params = new HashMap<>();
params.put("email", email);
params.put("password", password);
return params;
}
};
RequestQueue requestQueue = Volley.newRequestQueue(this);
requestQueue.add(stringRequest);
}
}
//我认为这里面临着一个问题
StringRequest stringRequest=new StringRequest(Request.Method.POST, URL_LOGIN,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
try {
JSONObject jsonObject=new JSONObject(response);
String success = jsonObject.getString("success");
JSONArray jsonArray=jsonObject.getJSONArray("login");
if (success.equals("1")) {
for (int i=0; i<jsonArray.length();i++){
JSONObject object = jsonArray.getJSONObject(i);
String name = object.getString("name").trim();
String email=object.getString( "email").trim();
Toast.makeText(LoginActivity.this,
"Success Login. \nYour Name : "
+name+"\nYour Email : "
+email, Toast.LENGTH_SHORT)
.show();
loading.setVisibility(View.GONE);
}
}
} catch (JSONException e) {
e.printStackTrace();
loading.setVisibility(View.GONE);
btn_login.setVisibility(View.VISIBLE);
Toast.makeText(LoginActivity.this, "Error!!! " +e.toString(),
Toast.LENGTH_SHORT).show();
}
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(LoginActivity.this, "Error!! " +error.toString(),
Toast.LENGTH_SHORT).show();
}
})
{
@Override
protected Map<String, String> getParams() throws AuthFailureError {
Map<String, String> params = new HashMap<>();
params.put("email", email);
params.put("password", password);
return params;
}
};
RequestQueue requestQueue = Volley.newRequestQueue(this);
requestQueue.add(stringRequest);
}
}
StringRequest StringRequest=新的StringRequest(Request.Method.POST,URL\u登录,
新的Response.Listener(){
@凌驾
公共void onResponse(字符串响应){
试一试{
JSONObject JSONObject=新JSONObject(响应);
String success=jsonObject.getString(“success”);
JSONArray JSONArray=jsonObject.getJSONArray(“登录”);
如果(成功等于(“1”)){
对于(int i=0;i显然,jsonObject
您在onResponse()中的receive没有输入值“success”
StringRequest stringRequest=new StringRequest(Request.Method.POST, URL_LOGIN,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
try {
JSONObject jsonObject=new JSONObject(response);
String success = jsonObject.getString("success");
JSONArray jsonArray=jsonObject.getJSONArray("login");
if (success.equals("1")) {
for (int i=0; i<jsonArray.length();i++){
JSONObject object = jsonArray.getJSONObject(i);
String name = object.getString("name").trim();
String email=object.getString( "email").trim();
Toast.makeText(LoginActivity.this,
"Success Login. \nYour Name : "
+name+"\nYour Email : "
+email, Toast.LENGTH_SHORT)
.show();
loading.setVisibility(View.GONE);
}
}
} catch (JSONException e) {
e.printStackTrace();
loading.setVisibility(View.GONE);
btn_login.setVisibility(View.VISIBLE);
Toast.makeText(LoginActivity.this, "Error!!! " +e.toString(),
Toast.LENGTH_SHORT).show();
}
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(LoginActivity.this, "Error!! " +error.toString(),
Toast.LENGTH_SHORT).show();
}
})
{
@Override
protected Map<String, String> getParams() throws AuthFailureError {
Map<String, String> params = new HashMap<>();
params.put("email", email);
params.put("password", password);
return params;
}
};
RequestQueue requestQueue = Volley.newRequestQueue(this);
requestQueue.add(stringRequest);
}
}
您应该使用方法jsonObject.optString(“成功”);
而不是jsonObject.getString(“成功”);
StringRequest stringRequest=new StringRequest(Request.Method.POST, URL_LOGIN,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
try {
JSONObject jsonObject=new JSONObject(response);
String success = jsonObject.getString("success");
JSONArray jsonArray=jsonObject.getJSONArray("login");
if (success.equals("1")) {
for (int i=0; i<jsonArray.length();i++){
JSONObject object = jsonArray.getJSONObject(i);
String name = object.getString("name").trim();
String email=object.getString( "email").trim();
Toast.makeText(LoginActivity.this,
"Success Login. \nYour Name : "
+name+"\nYour Email : "
+email, Toast.LENGTH_SHORT)
.show();
loading.setVisibility(View.GONE);
}
}
} catch (JSONException e) {
e.printStackTrace();
loading.setVisibility(View.GONE);
btn_login.setVisibility(View.VISIBLE);
Toast.makeText(LoginActivity.this, "Error!!! " +e.toString(),
Toast.LENGTH_SHORT).show();
}
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(LoginActivity.this, "Error!! " +error.toString(),
Toast.LENGTH_SHORT).show();
}
})
{
@Override
protected Map<String, String> getParams() throws AuthFailureError {
Map<String, String> params = new HashMap<>();
params.put("email", email);
params.put("password", password);
return params;
}
};
RequestQueue requestQueue = Volley.newRequestQueue(this);
requestQueue.add(stringRequest);
}
}
optString(“success”)
如果键“success”不存在,则返回空字符串(“”)。getString(“success”)
另一方面抛出一个JSONException。jsonObject
您在onResponse()
中的receive没有输入值“success”
StringRequest stringRequest=new StringRequest(Request.Method.POST, URL_LOGIN,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
try {
JSONObject jsonObject=new JSONObject(response);
String success = jsonObject.getString("success");
JSONArray jsonArray=jsonObject.getJSONArray("login");
if (success.equals("1")) {
for (int i=0; i<jsonArray.length();i++){
JSONObject object = jsonArray.getJSONObject(i);
String name = object.getString("name").trim();
String email=object.getString( "email").trim();
Toast.makeText(LoginActivity.this,
"Success Login. \nYour Name : "
+name+"\nYour Email : "
+email, Toast.LENGTH_SHORT)
.show();
loading.setVisibility(View.GONE);
}
}
} catch (JSONException e) {
e.printStackTrace();
loading.setVisibility(View.GONE);
btn_login.setVisibility(View.VISIBLE);
Toast.makeText(LoginActivity.this, "Error!!! " +e.toString(),
Toast.LENGTH_SHORT).show();
}
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(LoginActivity.this, "Error!! " +error.toString(),
Toast.LENGTH_SHORT).show();
}
})
{
@Override
protected Map<String, String> getParams() throws AuthFailureError {
Map<String, String> params = new HashMap<>();
params.put("email", email);
params.put("password", password);
return params;
}
};
RequestQueue requestQueue = Volley.newRequestQueue(this);
requestQueue.add(stringRequest);
}
}
您应该使用方法jsonObject.optString(“成功”);
而不是jsonObject.getString(“成功”);
StringRequest stringRequest=new StringRequest(Request.Method.POST, URL_LOGIN,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
try {
JSONObject jsonObject=new JSONObject(response);
String success = jsonObject.getString("success");
JSONArray jsonArray=jsonObject.getJSONArray("login");
if (success.equals("1")) {
for (int i=0; i<jsonArray.length();i++){
JSONObject object = jsonArray.getJSONObject(i);
String name = object.getString("name").trim();
String email=object.getString( "email").trim();
Toast.makeText(LoginActivity.this,
"Success Login. \nYour Name : "
+name+"\nYour Email : "
+email, Toast.LENGTH_SHORT)
.show();
loading.setVisibility(View.GONE);
}
}
} catch (JSONException e) {
e.printStackTrace();
loading.setVisibility(View.GONE);
btn_login.setVisibility(View.VISIBLE);
Toast.makeText(LoginActivity.this, "Error!!! " +e.toString(),
Toast.LENGTH_SHORT).show();
}
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(LoginActivity.this, "Error!! " +error.toString(),
Toast.LENGTH_SHORT).show();
}
})
{
@Override
protected Map<String, String> getParams() throws AuthFailureError {
Map<String, String> params = new HashMap<>();
params.put("email", email);
params.put("password", password);
return params;
}
};
RequestQueue requestQueue = Volley.newRequestQueue(this);
requestQueue.add(stringRequest);
}
}
optString(“success”)
返回空字符串(“”),如果键“success”不存在。getString(“success”)
另一方面抛出一个JSONException。你能分享应该得到的响应吗?我认为响应不包含任何字段名“success”.Query on postman以获得响应,否则请与后端开发人员联系。您能否共享应该获得的响应。我认为响应中不包含任何字段名“success”。查询postman以获取响应,否则请与后端开发人员联系。响应没有成功
密钥,它是JSON请在postman中检查您的服务是否有成功
密钥
响应
这是本地ip。您有公共ip吗?@JitenderDev是的,这是本地ip响应没有asuccess
key in it's json在邮递员中检查您的服务是否有success
key inresponse
这是本地ip。您有公共ip吗?@JitenderDev是的,这是本地ip谢谢,出现了错误,但应用程序没有响应。只是加载!它可能没有做任何事情,因为您只更改为使用optString而不是getString。您的根本问题仍然存在,您的JSON对象没有名为success的键,更改为optString,如@matdev said,如果该键不存在,则返回空字符串,而不是引发JSON异常。使用Postman或失眠将请求发送到API并确认您的结构r JSON对象响应并检查success
键是否确实存在于JSON的根目录中object@Boardy谢谢你的回复。我如何使用邮递员将请求发送给API我自己没有使用邮递员,我使用失眠症()。这对邮递员来说要简单得多,因为它的文档非常好。是的,你们都对,jsonObject没有获得条目“success”。因为,我在php端输入了错误,将“success”改为“success”。所以,刚刚更正了它,现在一切都已修复。非常感谢!谢谢,错误已显示,但应用程序没有响应。仅加载!它可能没有做任何事情,因为您只更改为使用optString而不是getString。您的根本问题仍然存在,您的JSON对象没有名为success的键,更改为o如果键不存在,ptString as@matdev said将返回一个空字符串,而不是抛出JSON异常。使用Postman或Dominash将请求发送到API,确认JSON对象响应的结构,并检查success
键是否确实存在于JSON的根目录中object@Boardy谢谢你的回复。如何使用Postman将请求发送给API我自己没有使用Postman,我使用的是失眠()。对于Postman来说,这要简单得多,文档也很好。是的,你们都知道jsonObject没有获得条目“success”。因为,我在php端输入了错误,将“success”改为“success”.所以,刚刚更正了它,现在一切都已修复。非常感谢!是的,你们都对,jsonObject没有获得条目“success”。因为,我在php端输入了错误,将“success”改为“success”.所以,刚刚更正了它,现在一切都已修复。非常感谢!-非常感谢。还有一件事,我刚刚看了一些教程并粘贴了Json代码和凌空库代码。我不知道它的实际工作原理和完整的过程。你能给我发一些关于这方面的好教程供我学习吗。好的。我会尝试在这里看到我的答案。它是y帮助你是的,你们都是对的,jsonObject没有得到条目“success”。因为,我在php端输入了错误,将“success”改为“success”.所以,刚刚更正了它,现在一切都已修复。非常感谢!-非常感谢。还有一件事,我刚刚看了一些教程并粘贴了Json代码和凌空库代码。我不知道它的实际工作原理和完整的过程。你能给我发一些关于这方面的好教程供我学习吗。好的。我会尝试在这里看到我的答案。它是我能帮你吗
StringRequest stringRequest=new StringRequest(Request.Method.POST, URL_LOGIN,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
try {
JSONObject jsonObject=new JSONObject(response);
String success = jsonObject.getString("success");
JSONArray jsonArray=jsonObject.getJSONArray("login");
if (success.equals("1")) {
for (int i=0; i<jsonArray.length();i++){
JSONObject object = jsonArray.getJSONObject(i);
String name = object.getString("name").trim();
String email=object.getString( "email").trim();
Toast.makeText(LoginActivity.this,
"Success Login. \nYour Name : "
+name+"\nYour Email : "
+email, Toast.LENGTH_SHORT)
.show();
loading.setVisibility(View.GONE);
}
}
} catch (JSONException e) {
e.printStackTrace();
loading.setVisibility(View.GONE);
btn_login.setVisibility(View.VISIBLE);
Toast.makeText(LoginActivity.this, "Error!!! " +e.toString(),
Toast.LENGTH_SHORT).show();
}
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(LoginActivity.this, "Error!! " +error.toString(),
Toast.LENGTH_SHORT).show();
}
})
{
@Override
protected Map<String, String> getParams() throws AuthFailureError {
Map<String, String> params = new HashMap<>();
params.put("email", email);
params.put("password", password);
return params;
}
};
RequestQueue requestQueue = Volley.newRequestQueue(this);
requestQueue.add(stringRequest);
}
}