将简单JSON解析为android 将JSON数据解析到android时出现问题 我已经描述了我面临的问题,有什么想法吗 如何克服这个问题
最初我使用了来自url的JSON将简单JSON解析为android 将JSON数据解析到android时出现问题 我已经描述了我面临的问题,有什么想法吗 如何克服这个问题,android,json,parsing,Android,Json,Parsing,最初我使用了来自url的JSON URL::http://54.218.73.244:8084/ JSONParser.java public class JSONParser { static InputStream is = null; static JSONArray jObj = null; static String json = ""; // constructor public JSONParser() { } pub
URL::http://54.218.73.244:8084/
JSONParser.java
public class JSONParser {
static InputStream is = null;
static JSONArray jObj = null;
static String json = "";
// constructor
public JSONParser() {
}
public JSONArray getJSONFromUrl(String url) {
// Making HTTP request
try {
// defaultHttpClient
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(
is, "iso-8859-1"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
json = sb.toString();
} catch (Exception e) {
Log.e("Buffer Error", "Error converting result " + e.toString());
}
// try parse the string to a JSON object
try {
jObj = new JSONArray(json);
} catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data " + e.toString());
}
// return JSON String
return jObj;
}
}
public class AndroidJSONParsingActivity extends Activity {
// url to make request
private static String url = "http://54.218.73.244:8084/";
private HashMap<Integer, String> contentsMap = new HashMap<Integer, String>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.on
Create(savedInstanceState);
setContentView(R.layout.activity_main);
// Creating JSON Parser instance
JSONParser jParser = new JSONParser();
// getting JSON string from URL
JSONArray json = jParser.getJSONFromUrl(url);
try {
for (int i = 0; i < json.length(); i++) {
JSONObject c = json.getJSONObject(i);
// Storing each json item in variable
int id = c.getInt("id");
String name = c.getString("content");
contentsMap.put(id, name);
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
@Override
protected void onResume() {
super.onResume();
TextView textView=(TextView) findViewById(R.id.textView1);
textView.setText(contentsMap.get(1));
textView=(TextView) findViewById(R.id.textView2);
textView.setText(contentsMap.get(2));
}
}
AndroidJSONParsingActivity.java
public class JSONParser {
static InputStream is = null;
static JSONArray jObj = null;
static String json = "";
// constructor
public JSONParser() {
}
public JSONArray getJSONFromUrl(String url) {
// Making HTTP request
try {
// defaultHttpClient
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(
is, "iso-8859-1"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
json = sb.toString();
} catch (Exception e) {
Log.e("Buffer Error", "Error converting result " + e.toString());
}
// try parse the string to a JSON object
try {
jObj = new JSONArray(json);
} catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data " + e.toString());
}
// return JSON String
return jObj;
}
}
public class AndroidJSONParsingActivity extends Activity {
// url to make request
private static String url = "http://54.218.73.244:8084/";
private HashMap<Integer, String> contentsMap = new HashMap<Integer, String>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.on
Create(savedInstanceState);
setContentView(R.layout.activity_main);
// Creating JSON Parser instance
JSONParser jParser = new JSONParser();
// getting JSON string from URL
JSONArray json = jParser.getJSONFromUrl(url);
try {
for (int i = 0; i < json.length(); i++) {
JSONObject c = json.getJSONObject(i);
// Storing each json item in variable
int id = c.getInt("id");
String name = c.getString("content");
contentsMap.put(id, name);
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
@Override
protected void onResume() {
super.onResume();
TextView textView=(TextView) findViewById(R.id.textView1);
textView.setText(contentsMap.get(1));
textView=(TextView) findViewById(R.id.textView2);
textView.setText(contentsMap.get(2));
}
}
我根据错误进行的分析::
- 解析无法转换为JSONArray的字符串时出错
- 如何解决这个错误
- 对于URL::
http://54.218.73.244:8084/
[{“id”:1,“content”:“Hello”},{“id”:2,“content”:“World”}]
- 对于URL::
http://54.218.73.244:7003/
[{“id”:1,“content”:“Hello”},{“id”:2,“content”:“World”}]
JSON的结构相同,请使用浏览器中的url确认
谢谢,
您的服务器位于
http://54.218.73.244:7003/
不支持POST
请求
因此,要么让服务器接受POST
请求,要么在JSONParser
类中更改以下行
//HttpPost httpPost = new HttpPost(url); //Remove this and replace with the below
HttpGet httpGet = new HttpGet(url);
分析数据org.json.JSONException时出错:不能将java.lang.String类型的值转换为JSONArray 从错误日志中可以看出,问题是您试图解析的JSON字符串无效 问题实际上与代码无关。请确保从服务器获得正确的JSON响应。/MainActivity.java 包com.example.jsonparsing
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.HashMap;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.BasicResponseHandler;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ListView;
import android.widget.Toast;
public class MainActivity extends Activity {
ListView list;
JSONObject jsonobject;
CutsomAdapter adapter;
JSONArray jsonarray;
static InputStream is = null;
static JSONObject jObj = null;
static String json = "";
ArrayList<HashMap<String, String>> arraylist;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
list = (ListView) findViewById(R.id.list);
new getData()
.execute();
}
private class getData extends AsyncTask<String, Void, Void> {
private ProgressDialog Dialog = new ProgressDialog(MainActivity.this);
protected void onPreExecute() {
// NOTE: You can call UI Element here.
Dialog.setMessage("Downloading source..");
Dialog.show();
}
@Override
protected Void doInBackground(String... url) {
// TODO Auto-generated method stub
arraylist = new ArrayList<HashMap<String, String>>();
try {
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost("Your Url");
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(is, "iso-8859-1"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line+"n");
}
is.close();
json = sb.toString();
} catch (Exception e) {
Log.e("", "Error converting result " + e.toString());
}
// try parse the string to a JSON object
try {
jObj = new JSONObject(json);
JSONObject jObj1 = new JSONObject(jObj.getJSONObject("response").toString());
jsonarray = jObj1.getJSONArray("venues");
for (int i = 0; i < jsonarray.length(); i++) {
HashMap<String, String> map = new HashMap<String, String>();
JSONObject c = jsonarray.getJSONObject(i);
// JSONObject c1 = jsonarray1.getJSONObject(i);
// Retrive JSON Objects
map.put("name", c.getString("name"));
Log.e("Name", c.getString("name"));
HashMap<String, String> map1 = new HashMap<String, String>();
JSONObject jObj3 = new JSONObject(c.getString("location"));
if(jObj3.has("formattedAddress"))
map.put("address", jObj3.getString("formattedAddress"));
arraylist.add(map);
}
} catch (JSONException e) {
Log.e("", "Error parsing data " + e.toString());
}
return null;
}
protected void onPostExecute(Void result) {
Log.e("Responce", arraylist.toString());
adapter=new CutsomAdapter(MainActivity.this,arraylist);
list.setAdapter(adapter);
Dialog.dismiss();
}
}
}
导入java.io.BufferedReader;
导入java.io.IOException;
导入java.io.InputStream;
导入java.io.InputStreamReader;
导入java.io.UnsupportedEncodingException;
导入java.util.ArrayList;
导入java.util.HashMap;
导入org.apache.http.HttpEntity;
导入org.apache.http.HttpResponse;
导入org.apache.http.client.ClientProtocolException;
导入org.apache.http.client.HttpClient;
导入org.apache.http.client.ResponseHandler;
导入org.apache.http.client.methods.HttpGet;
导入org.apache.http.client.methods.HttpPost;
导入org.apache.http.impl.client.BasicResponseHandler;
导入org.apache.http.impl.client.DefaultHttpClient;
导入org.json.JSONArray;
导入org.json.JSONException;
导入org.json.JSONObject;
导入android.app.Activity;
导入android.app.ProgressDialog;
导入android.os.AsyncTask;
导入android.os.Bundle;
导入android.util.Log;
导入android.view.Menu;
导入android.view.MenuItem;
导入android.widget.ListView;
导入android.widget.Toast;
公共类MainActivity扩展了活动{
列表视图列表;
JSONObject JSONObject;
切割适配器;
JSONArray JSONArray;
静态InputStream为空;
静态JSONObject jObj=null;
静态字符串json=“”;
ArrayList ArrayList;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
list=(ListView)findViewById(R.id.list);
新getData()
.execute();
}
私有类getData扩展异步任务{
private ProgressDialog=新建ProgressDialog(MainActivity.this);
受保护的void onPreExecute(){
//注意:您可以在这里调用UI元素。
setMessage(“下载源…”);
Dialog.show();
}
@凌驾
受保护的Void doInBackground(字符串…url){
//TODO自动生成的方法存根
arraylist=新的arraylist();
试一试{
DefaultHttpClient httpClient=新的DefaultHttpClient();
HttpPost HttpPost=新的HttpPost(“您的Url”);
HttpResponse HttpResponse=httpClient.execute(httpPost);
HttpEntity HttpEntity=httpResponse.getEntity();
is=httpEntity.getContent();
}捕获(不支持的编码异常e){
e、 printStackTrace();
}捕获(客户端协议例外e){
e、 printStackTrace();
}捕获(IOE异常){
e、 printStackTrace();
}
试一试{
BufferedReader reader=新的BufferedReader(新的InputStreamReader(is,“iso-8859-1”),8;
StringBuilder sb=新的StringBuilder();
字符串行=null;
而((line=reader.readLine())!=null){
sb.附加(第+行“n”);
}
is.close();
json=sb.toString();
}捕获(例外e){
Log.e(“,”错误转换结果“+e.toString());
}
//尝试将字符串解析为JSON对象
试一试{
jObj=新的JSONObject(json);
JSONObject jObj1=新的JSONObject(jObj.getJSONObject(“response”).toString());
jsonarray=jObj1.getJSONArray(“场馆”);
for(int i=0;ipackage com.example.jsonparsing;
import java.util.ArrayList;
import java.util.HashMap;
import android.content.Context;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.BaseAdapter;
import android.widget.TextView;
public class CutsomAdapter extends BaseAdapter {
private ArrayList<HashMap<String, String>> values;
private Context context;
LayoutInflater inflater;
public CutsomAdapter(Context context,
ArrayList<HashMap<String, String>> arraylist) {
this.context = context;
this.values = arraylist;
}
@Override
public int getCount() {
return values.size();
}
@Override
public Object getItem(int position) {
return null;
}
@Override
public long getItemId(int position) {
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View itemView = inflater.inflate(R.layout.row, parent, false);
TextView textname = (TextView) itemView.findViewById(R.id.name);
TextView textaddress = (TextView) itemView
.findViewById(R.id.address);
textname.setText(values.get(position).get("name"));
textaddress.setText(values.get(position).get("address"));
return itemView;
}
}
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="${relativePackage}.${activityClass}" >
<ListView
android:id="@+id/list"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
</ListView>
</RelativeLayout>
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/name"
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:text="name"
android:layout_marginLeft="5dp"/>
<TextView
android:id="@+id/address"
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:text="addess"
android:layout_marginLeft="5dp"/>
</LinearLayout>