Java Android Studio restTemplate解析JSON
[英]Java Android Studio restTemplate parse JSON
问题描述
我从URL- WooCommerce API获取JSON。
问题是我无法在应用中解析/输出它们。
没有错误，但是它没有显示任何数据-仅显示标签。
MainActivity.java：
package at.copy_cat.app.rest;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.web.client.RestTemplate;
public class MainActivity extends ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment())
.commit();
}
}
@Override
protected void onStart() {
super.onStart();
new HttpRequestTask().execute();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_refresh) {
new HttpRequestTask().execute();
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
return rootView;
}
}
private class HttpRequestTask extends AsyncTask<Void, Void, Greeting> {
@Override
protected Greeting doInBackground(Void... params) {
try {
final String url = "http://copy-cat.at/api/index.json";
RestTemplate restTemplate = new RestTemplate();
restTemplate.getMessageConverters().add(new MappingJackson2HttpMessageConverter());
/**Greeting greeting = restTemplate.getForObject(url, Greeting[].class);**/
Greeting greeting = restTemplate.getForObject(url, Greeting.class);
/** Greeting greeting = Arrays.asList(restTemplate.getForObject(url, Greeting[].class));**/
RestTemplate rest = new RestTemplate();
return greeting;
} catch (Exception e) {
Log.e("MainActivity", e.getMessage(), e);
}
return null;
}
@Override
protected void onPostExecute(Greeting greeting) {
TextView greetingIdText = (TextView) findViewById(R.id.id_value);
TextView greetingContentText = (TextView) findViewById(R.id.content_value);
greetingIdText.setText(greeting.getId());
greetingContentText.setText(greeting.getContent());
}
}
}
Greeting.java：
package at.copy_cat.app.rest;
import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
/**
* Created by Michael on 17.10.2017.
*/
@JsonIgnoreProperties(ignoreUnknown=true)
public class Greeting {
private String products;
public String title;
public String getId() {
return this.products;
}
public String getContent() {
return this.title;
}
}
使用像这样的简单JSON： {“ id”：161，“ content”：“ Hello，World！”}，它可以正常工作，但此处不能使用生成的JSON。
是的，它是一个.php文件，但我在Java代码中使用了.json，其输出与PHP脚本一样，...
问题是：如何通过ID等解析产品等信息。
非常感谢！
编辑/更新：现在看起来像这样
package at.copy_cat.app.rest;
import android.util.Log;
import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.HashMap;
import java.util.List;
/**
* Created by Michael on 17.10.2017.
*/
@JsonIgnoreProperties(ignoreUnknown=true)
public class Greeting {
// getters and setters
public List products;
public String getContent(){
String convertedToString = "" + products;
/**String[] value_split = convertedToString.split(",");**/
String[] value_split = convertedToString.split("\\,");
try {
JSONArray json = new JSONArray(products);
for(int i=0;i<json.length();i++){
HashMap<String, String> map = new HashMap<String, String>();
JSONObject e = json.getJSONObject(i);
/** Log.v("TEST23243235", "TESTOBJ" + e);**/
/**JSONArray people = e.getJSONArray("products");
int numOfPeople = e.getInt("images");**/
map.put("id", String.valueOf(i));
map.put("productid", "Product ID:" + e.getString("id"));
map.put("title", "Title: " + e.getString("title"));
map.put("permalink", "Permalink: " + e.getString("permalink"));
map.put("status", "Status: " + e.getString("status"));
map.put("regular_price", "Regular Price: " + e.getString("regular_price"));
map.put("price", "Price: " + e.getString("price"));
// map.put("description", "Description: " + e.getString("description"));
// map.put("categories", "Categories: " + e.getString("categories"));
// map.put("images", "Images: " + e.getString("images"));
Log.v("TEST23243235", "TESTOBJ" + map);
Log.v("TEST23243235", "TESTOBJ" + json);
Log.v("TEST23243235", "TESTOBJI" + i);
return map.toString();
}
// Extract data from json and store into ArrayList as class objects
/**JSONObject json_data = jArray.getJSONObject(i);
String id = jObj.getString("id");
Log.d("TEST23243235", "TEST" + id);**/
} catch (JSONException e) {
Log.e("TEST23243235", "unexpected JSON exception", e);
// Do something to recover ... or kill the app.
}
return "";
}
public void setProducts(List products){
this.products = products;
}
public class Model {
private String title;
//other fields
//getters and setters
}
public String getId() {
return "1";
}
/** public String getContent() {
return this.convertedToString;
}**/
}
Logcat中的输出
TESTOBJ{price=Price: 30.00, regular_price=Regular Price: 0.00, title=Title: Camera DS, status=Status: publish, permalink=Permalink: http://copy-cat.at/produkt/camera-ds-2, id=0, productid=Product ID:590}
TESTOBJI0
所以我现在可以从Json输出1个产品，但不能输出两个或更多。...我该怎么做才能解析所有产品而不仅仅是一个？
是的，代码不干净-很抱歉，我正在学习... :)
3 个解决方案
解决方案1
0 2017-10-18 14:03:35
您的products变量是私有的。 它必须有一个setter。 否则，杰克逊无法为其设置价值。
因此，您的json看起来像这样：
{
"products": [
{title and other fields}
]
}
因此，您的课程应如下所示：
public class Products {
private List<Model> products;
// getters and setters
public static class Model {
private String title;
//other fields
//getters and setters
}
}
我们使用Products类作为包装器，因为json也包装在products字段中。
解决方案2
0 2017-10-18 14:46:06
您是否知道以下事实：在链接的json中，您获得了带有对象数组的对象？
解决方案3
0 2017-10-18 18:01:10
更新：
package at.copy_cat.app.rest;
import android.util.Log;
import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
import java.util.ArrayList;
/**
* Created by Michael on 17.10.2017.
*/
@JsonIgnoreProperties(ignoreUnknown=true)
public class Greeting {
// getters and setters
public ArrayList products;
public String getContent(){
String convertedToString = "" + products;
String[] value_split = convertedToString.split(",");
Log.d("TEST23243235", "TEST" + products);
return convertedToString;
}
public void setProducts(ArrayList products){
this.products = products;
}
public class Model {
private String title;
//other fields
//getters and setters
}
public String getId() {
return "1";
}
/** public String getContent() {
return this.convertedToString;
}**/
}
现在，我在应用程序和控制台中具有json输出。 现在的问题是-输出在〜1068个符号处停止。
这是输出：
10-18 19:54:22.256 13706-13706/at.copy_cat.app.rest D/TEST23243235: TEST[{title=Camera DS, id=590, created_at=2014-08-18T19:58:28Z, updated_at=2017-09-05T12:48:07Z, type=variable, status=publish, downloadable=false, virtual=false, permalink=http://copy-cat.at/produkt/camera-ds-2, sku=451039, price=30.00, regular_price=0.00, sale_price=null, price_html=<span class="woocommerce-Price-amount amount"><span class="woocommerce-Price-currencySymbol">€</span>30.00</span> – <span class="woocommerce-Price-amount amount"><span class="woocommerce-Price-currencySymbol">€</span>44.00</span>, taxable=false, tax_status=taxable, tax_class=, managing_stock=true, stock_quantity=12, in_stock=true, backorders_allowed=false, backordered=false, sold_individually=false, purchaseable=true, featured=true, visible=true, catalog_visibility=visible, on_sale=true, product_url=, button_text=, weight=0.20, dimensions={length=35, width=45, height=13, unit=cm}, shipping_required=true, shipping_taxable=true, shipping_class=box1-he, shipping_class_id=68, description=<p>Donec rutrum congue leo eget malesuada. Pellentesque in ipsum id orci porta dapibus. Praesent sapien massa, convallis a pellentesque nec, egestas non nisi. Vivamus suscipit tortor eget felis porttitor volutpat. Vivamus suscipit tortor eget felis porttitor volutpat. Praesent sapien massa, convallis a pellentesque nec, egestas non nisi. Curabitur non nulla sit amet nisl tempus convallis quis ac lectus. Donec sollicitudin molestie malesuada. Vestibulum ac diam sit amet quam vehicula elementum sed sit amet dui. Mauris blandit aliquet elit, eget tincidunt nibh pulvinar a.</p>
, short_description=<p>Donec sollicitudin molestie malesuada. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Donec velit neque, auctor sit amet aliquam vel, ullamcorper sit amet ligula. Donec ..., reviews_allowed=true, average_rating=0.00, rating_count=0, related_ids=[125, 126, 138, 118, 140], upsell_ids=[], cross_sell_ids=[], parent_id=0, categories=[Adapters, Batteries, Cables&Adapters, Camcoder Tapes & Discs, Cameras, Cases, Digital Cameras, Digital SLR, Discs], tags=[], images=[{id=399, created_at=2014-08-18T13:52:46Z, updated_at=2014-08-18T13:52:46Z, src=http://copy-cat.at/wp-content/uploads/2014/06/a21.jpg, title=a2, alt=, position=0}, {id=419, created_at=2014-08-18T13:53:09Z, updated_at=2014-08-18T13:53:09Z, src=http://copy-cat.at/wp-content/uploads/2014/06/a61.jpg, title=a6, alt=, position=1}, {id=414, created_at=2014-08-18T13:53:04Z, updated_at=2014-08-18T13:53:04Z, src=http://copy-cat.at/wp-content/uploads/2014/06/a51.jpg, title=a5, alt=, position=2}, {id=409, created_at=2014-08-18T13:52:58Z, updated_at=2014-08-18T13:52:58Z, src=http://copy-cat.at/wp-content/uploads/2014/06/a41.jpg, title=a4, alt=, position=3}, {id=404, created_at=2014-08-18T13:52:52Z, updated_at=2014-08-18T13:52:52Z, src=http://copy-cat.at/wp-content/uploads/2014/06/a31.jpg, title=a3, alt=, position=4}, {id=399, created_at=2014-08-18T13:52:46Z, updated_at=2014-08-18T13:52:46Z, src=http://copy-cat.at/wp-content/uploads/2014/06/a21.jpg, title=a2, alt=, position=5}, {id=394, created_at=2014-08-18T13:52:41Z, updated_at=2014-08-18T13:52:41Z, src=http://copy-cat.at/wp-content/uploads/2014/06/a11.jpg, title=a1, alt=, position=6}], featured_src=http://copy-cat.at/wp-content/uploads/2014/06/a21.jpg, attributes=[{name=colors, slug=colors, position=0, visible=true, variation=true, options=[Black, Green]}], downloads=[], download_limit=-1, download_expiry=-1, download_type=standard, purchase_note=, total_sales=19, variations=[{id=6892, created_at=2015-01-16T09:03:52Z, updated_at=2015-01-16T09:03:52Z, downloadable=false, virtual=false, permalink=http://copy-cat.at/produkt/camera-ds-2?attribute_pa_colors=black, sku=451039, price=30.00, regular_price=35.00, sale_price=30.00, taxable=false, tax_status=taxable, tax_class=, managing_stock=parent, stock_quantity=12, in_stock=true, backordered=false, purchaseable=true, visible=true, on_sale=true, weight=0.20, dimensions={length=35, width=45, height=13, unit=cm}, shipping_class=box1-he,
它停止@ shipping_class = box1-he，。
像这样的长度输出http://copy-cat.at/api/index.json这是什么问题？
谢谢！
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