Android解析JSON方式(二) 客户端解析SON数据
json
适用于现代 C++ 的 JSON。
项目地址:https://gitcode.com/gh_mirrors/js/json
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在上一篇中搭建了服务器端的程序,这篇我们来建立一个Android项目,来访问服务器取得JSON格式数据,并解析JSON数据格式,输出到日志控制台。
我们建立的项目目录结构如下:
运行的界面截图:
当我们分别点击四个按钮,可以看到控制台的输出日志:
以下是源代码:
main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<Button
android:id="@+id/person"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="解析person数据"
android:onClick="click"/>
<Button
android:id="@+id/persons"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="解析persons数据"
android:onClick="click"/>
<Button
android:id="@+id/listString"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="解析listString数据"
android:onClick="click"/>
<Button
android:id="@+id/listMap"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="解析listMap数据"
android:onClick="click"/>
</LinearLayout>
MainActivity.java
package com.json.activity;
import java.util.List;
import java.util.Map;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import com.json.bean.Person;
import com.json.util.HttpUtils;
import com.json.util.JsonTools;
public class MainActivity extends Activity {
private static String PATH = "http://192.168.56.1:8080/JsonProject/servlet/JsonServlet";
private static final String TAG = "MainActivity";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
public void click(View v){
switch (v.getId()) {
case R.id.person:
String path1=PATH+"?action_flag=person";
String jsonString1 = HttpUtils.getJsonContent(path1);
Person person = JsonTools.getPerson("person", jsonString1);
Log.i(TAG, person.toString());
break;
case R.id.persons:
String path2=PATH+"?action_flag=persons";
String jsonString2 = HttpUtils.getJsonContent(path2);
List<Person> list2 = JsonTools.getPersons("persons", jsonString2);
Log.i(TAG, list2.toString());
break;
case R.id.listString:
String path3=PATH+"?action_flag=listString";
String jsonString3 = HttpUtils.getJsonContent(path3);
List<String> list3 = JsonTools.getList("listString", jsonString3);
Log.i(TAG, list3.toString());
break;
case R.id.listMap:
String path4=PATH+"?action_flag=listMap";
String jsonString4 = HttpUtils.getJsonContent(path4);
List<Map<String,Object>> list4 = JsonTools.getListMap("listMap", jsonString4);
Log.i(TAG, list4.toString());
break;
}
}
}
Person.java
package com.json.bean;
public class Person {
private int id;
private String name;
private String address;
public Person() {
super();
}
public Person(int id, String name, String addrss) {
super();
this.id = id;
this.name = name;
this.address = addrss;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
@Override
public String toString() {
return "Person [addrss=" + address + ", id=" + id + ", name=" + name
+ "]";
}
}
HttpUtils.java
package com.json.util;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
public class HttpUtils {
public HttpUtils() {
}
public static String getJsonContent(String path){
try {
URL url = new URL(path);
HttpURLConnection connection = (HttpURLConnection)url.openConnection();
connection.setConnectTimeout(3000);
connection.setRequestMethod("GET");
connection.setDoInput(true);
int code = connection.getResponseCode();
if(code == 200){
return changeInputStream(connection.getInputStream());
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
/**
* 将一个输入流转换成指定编码的字符串
* @param inputStream
* @return
*/
private static String changeInputStream(InputStream inputStream) {
String jsonString = "";
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
int len = 0;
byte[] data = new byte[1024];
try {
while((len=inputStream.read(data))!=-1){
outputStream.write(data,0,len);
}
jsonString = new String(outputStream.toByteArray());
} catch (IOException e) {
e.printStackTrace();
}
return jsonString;
}
}
JsonTools.java
package com.json.util;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import com.json.bean.Person;
/**
* 完成对JSON数据的解析
* @author wulianghuan
*
*/
public class JsonTools {
public JsonTools() {
}
/**
* 获取对象数据
* @param key
* @param jsonString
* @return
*/
public static Person getPerson(String key,String jsonString){
Person person = new Person();
try {
JSONObject jsonObject = new JSONObject(jsonString);
JSONObject personObject = jsonObject.getJSONObject(key);
person.setId(personObject.getInt("id"));
person.setName(personObject.getString("name"));
person.setAddress(personObject.getString("address"));
} catch (JSONException e) {
e.printStackTrace();
}
return person;
}
/**
* 获取对象数组数据
* @param key
* @param jsonString
* @return
*/
public static List<Person> getPersons(String key,String jsonString){
List<Person> list = new ArrayList<Person>();
try {
JSONObject jsonObject = new JSONObject(jsonString);
//返回json的数组
JSONArray jsonArray = jsonObject.getJSONArray(key);
for(int i=0;i<jsonArray.length();i++){
JSONObject jsonObject2 = jsonArray.getJSONObject(i);
Person person = new Person();
person.setId(jsonObject2.getInt("id"));
person.setName(jsonObject2.getString("name"));
person.setAddress(jsonObject2.getString("address"));
list.add(person);
}
} catch (JSONException e) {
e.printStackTrace();
}
return list;
}
/**
* 获取String数组数据
* @param key
* @param jsonString
* @return
*/
public static List<String> getList(String key,String jsonString){
List<String> list = new ArrayList<String>();
try {
JSONObject jsonObject = new JSONObject(jsonString);
JSONArray jsonArray = jsonObject.getJSONArray(key);
for(int i=0;i<jsonArray.length();i++){
String msg = jsonArray.getString(i);
list.add(msg);
}
} catch (JSONException e) {
e.printStackTrace();
}
return list;
}
/**
* 获取对象的Map集合数据
* @param key
* @param jsonString
* @return
*/
public static List<Map<String,Object>> getListMap(String key,String jsonString){
List<Map<String,Object>> list = new ArrayList<Map<String,Object>>();
try {
JSONObject jsonObject = new JSONObject(jsonString);
JSONArray jsonArray = jsonObject.getJSONArray(key);
for(int i=0;i<jsonArray.length();i++){
JSONObject jsonObject2 = jsonArray.getJSONObject(i);
Map<String,Object> map = new HashMap<String, Object>();
Iterator<String> iterator = jsonObject2.keys();
while(iterator.hasNext()){
String json_key = iterator.next();
Object json_value = jsonObject2.get(json_key);
if(json_value==null){
json_value = "";
}
map.put(json_key, json_value);
}
list.add(map);
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return list;
}
}
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适用于现代 C++ 的 JSON。
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