ch027 Android Json

--------------------------------------------AndroidManifest.xml---------------------------------

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

package="com.kawa.ch32"

android:versionCode="1"

android:versionName="1.0" >

<uses-sdk

android:minSdkVersion="8"

android:targetSdkVersion="15" />

<uses-permission android:name="android.permission.INTERNET" />

<application

android:icon="@drawable/ic_launcher"

android:label="@string/app_name"

android:theme="@style/AppTheme" >

<activity

android:name=".MainActivity"

android:label="@string/title_activity_main" >

<intent-filter>

</intent-filter>

</activity>

</application>

</manifest>

--------------------------------------------activity_main.xml------------------------------------

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:tools="http://schemas.android.com/tools"

android:id="@+id/LinearLayout1"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical" >

<Button

android:id="@+id/btn1"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="getJSONArray" />

<Button

android:id="@+id/btn2"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="getJSONObject" />

<Button

android:id="@+id/btn3"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="getJSON" />

</LinearLayout>

--------------------------------------------MainActivity.java--------------------------------------

package com.kawa.ch32;

import java.util.List;

import java.util.Map;

import android.app.Activity;

import android.app.AlertDialog;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import com.kawa.ch32.util.JsonUtil;

public class MainActivity extends Activity {

private Button btn_array;

private Button btn_object;

private Button btn_json;

private String URL_JSONARRAY = "http://192.168.1.105:8080/com.kawa.ch32.web/JSONArray";

private String URL_JSONOBJECT = "http://192.168.1.105:8080/com.kawa.ch32.web/JSONObject";

private String URL_JSON = "http://192.168.1.105:8080/com.kawa.ch32.web/JSON";

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

findViews();

setListeners();

}

private void findViews() {

btn_array = (Button) findViewById(R.id.btn1);

btn_object = (Button) findViewById(R.id.btn2);

btn_json = (Button) findViewById(R.id.btn3);

}

private void setListeners() {

btn_array.setOnClickListener(onClickListener);

btn_object.setOnClickListener(onClickListener);

btn_json.setOnClickListener(onClickListener);

}

private OnClickListener onClickListener = new OnClickListener() {

@Override

public void onClick(View view) {

switch (view.getId()) {

case R.id.btn1:

try {

showResult(JsonUtil.getJSONArray(URL_JSONARRAY));

} catch (Exception e1) {

e1.printStackTrace();

}

break;

case R.id.btn2:

try {

showResult(JsonUtil.getJSONObject(URL_JSONOBJECT));

} catch (Exception e) {

e.printStackTrace();

}

break;

case R.id.btn3:

try {

showResult(JsonUtil.getJSON(URL_JSON));

} catch (Exception e) {

e.printStackTrace();

}

break;

}

};

private void showResult(List<Map<String, String>> jsonList) {

StringBuffer result = new StringBuffer();

try {

for (Map<String, String> map : jsonList) {

String id = map.get("id");

String name = map.get("name");

result.append(id).append("--").append(name);

}

new AlertDialog.Builder(this).setTitle("json")

.setMessage(result.toString()).setPositiveButton("ok", null).show();

} catch (Exception e) {

e.printStackTrace();

}

--------------------------------------------JsonUtil.java------------------------------------------

package com.kawa.ch32.util;

import java.io.ByteArrayOutputStream;

import java.io.InputStream;

import java.net.*;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import org.json.JSONArray;

import org.json.JSONObject;

import android.util.Log;

public class JsonUtil {

/**

* 获取"数组形式"的JSON数据，

* 数据形式：[{"id":1,"name":"小猪"},{"id":2,"name":"小猫"}]

* @param path 网页路径

* @return 返回List

* @throws Exception

public static List<Map<String, String>> getJSONArray(String path)

throws Exception {

String json = null;

List<Map<String, String>> list = new ArrayList<Map<String, String>>();

Map<String, String> map = null;

URL url = new URL(path);

// 利用HttpURLConnection对象,我们可以从网络中获取网页数据.

HttpURLConnection conn = (HttpURLConnection) url.openConnection();

// 单位是毫秒，设置超时时间为5秒

conn.setConnectTimeout(5 * 1000);

// HttpURLConnection是通过HTTP协议请求path路径的，所以需要设置请求方式,可以不设置，因为默认为GET

conn.setRequestMethod("GET");

// 判断请求码是否是200码，否则失败

if (conn.getResponseCode() == 200) {

InputStream is = conn.getInputStream(); // 获取输入流

byte[] data = readStream(is); // 把输入流转换成字符数组

json = new String(data); // 把字符数组转换成字符串

// 数据形式：[{"id":1,"name":"小猪","age":22},{"id":2,"name":"小猫","age":23}]

// 数据直接为一个数组形式，所以可以直接用android提供的框架JSONArray读取JSON数据，转换成Array

JSONArray jsonArray = new JSONArray(json);

for (int i = 0; i < jsonArray.length(); i++) {

// 每条记录又由几个Object对象组成

JSONObject item = jsonArray.getJSONObject(i);

int id = item.getInt("id"); // 获取对象对应的值

String name = item.getString("name");

map = new HashMap<String, String>(); // 存放到MAP里面

map.put("id", id + "");

map.put("name", name);

list.add(map);

}

return list;

}

/**

* 获取"对象形式"的JSON数据，

* 数据形式：{"total":2,"success":true,"arrayData":[{"id":1,"name":"小猪"},{"id":2,"name":"小猫"}]}

* @param path 网页路径

* @return 返回List

* @throws Exception

public static List<Map<String, String>> getJSONObject(String path)

throws Exception {

List<Map<String, String>> list = new ArrayList<Map<String, String>>();

Map<String, String> map = null;

URL url = new URL(path);

// 利用HttpURLConnection对象,我们可以从网络中获取网页数据

HttpURLConnection conn = (HttpURLConnection) url.openConnection();

conn.setConnectTimeout(5 * 1000); // 单位是毫秒，设置超时时间为5秒

// HttpURLConnection是通过HTTP协议请求path路径的，所以需要设置请求方式,可以不设置，因为默认为GET

conn.setRequestMethod("GET");

// 判断请求码是否是200码，否则失败

if (conn.getResponseCode() == 200) {

InputStream is = conn.getInputStream(); // 获取输入流

byte[] data = readStream(is); // 把输入流转换成字符数组

String json = new String(data); // 把字符数组转换成字符串

// 数据形式：{"total":2,"success":true,"arrayData":[{"id":1,"name":"小猪"},{"id":2,"name":"小猫"}]}

// 返回的数据形式是一个Object类型，所以可以直接转换成一个Object

JSONObject jsonObject = new JSONObject(json);

int total = jsonObject.getInt("total");

Boolean success = jsonObject.getBoolean("success");

// 里面有一个数组数据，可以用getJSONArray获取数组

JSONArray jsonArray = jsonObject.getJSONArray("arrayData");

for (int i = 0; i < jsonArray.length(); i++) {

JSONObject item = jsonArray.getJSONObject(i); // 得到每个对象

int id = item.getInt("id"); // 获取对象对应的值

String name = item.getString("name");

map = new HashMap<String, String>(); // 存放到MAP里面

map.put("id", id + "");

map.put("name", name);

list.add(map);

}

return list;

}

/**

* 获取类型复杂的JSON数据

*数据形式：

{"name":"小猪",

"age":23,

"content":{"questionsTotal":2,

"questions": [ { "question": "what's your name?", "answer": "小猪"},

{"question": "what's your age", "answer": "23"}]

}

* @param path 网页路径

* @return 返回List

* @throws Exception

public static List<Map<String, String>> getJSON(String path) throws Exception {

List<Map<String, String>> list = new ArrayList<Map<String, String>>();

Map<String, String> map = null;

URL url = new URL(path);

// 利用HttpURLConnection对象,我们可以从网络中获取网页数据.

HttpURLConnection conn = (HttpURLConnection) url.openConnection();

conn.setConnectTimeout(5 * 1000); // 单位是毫秒，设置超时时间为5秒

// HttpURLConnection是通过HTTP协议请求path路径的，所以需要设置请求方式,可以不设置，因为默认为GET

conn.setRequestMethod("GET");

if (conn.getResponseCode() == 200) {// 判断请求码是否是200码，否则失败

InputStream is = conn.getInputStream(); // 获取输入流

byte[] data = readStream(is); // 把输入流转换成字符数组

String json = new String(data); // 把字符数组转换成字符串

* 数据形式：

* {"name":"小猪",

* "age":23,

* "content":{"questionsTotal":2,

* "questions": [ { "question": "what's your name?", "answer": "小猪"},

* {"question": "what's your age", "answer":

* "23"}]

* }

// 返回的数据形式是一个Object类型，所以可以直接转换成一个Object

JSONObject jsonObject = new JSONObject(json);

String name = jsonObject.getString("name");

int age = jsonObject.getInt("age");

Log.i("abc", "name:" + name + " | age:" + age); // 测试数据

// 获取对象中的对象

JSONObject contentObject = jsonObject.getJSONObject("content");

// 获取对象中的一个值

String questionsTotal = contentObject.getString("questionsTotal");

// 获取对象中的数组

JSONArray contentArray = contentObject.getJSONArray("questions");

for (int i = 0; i < contentArray.length(); i++) {

JSONObject item = contentArray.getJSONObject(i); // 得到每个对象

String question = item.getString("question"); // 获取对象对应的值

String answer = item.getString("answer");

map = new HashMap<String, String>(); // 存放到MAP里面

map.put("question", question);

map.put("answer", answer);

list.add(map);

}

return list;

}

/**

* 把输入流转换成字符数组

* @param inputStream 输入流

* @return 字符数组

* @throws Exception

public static byte[] readStream(InputStream inputStream) throws Exception {

ByteArrayOutputStream bout = new ByteArrayOutputStream();

byte[] buffer = new byte[1024];

int len = 0;

while ((len = inputStream.read(buffer)) != -1) {

bout.write(buffer, 0, len);

}

bout.close();

inputStream.close();

return bout.toByteArray();

}

--------------------------------------------结果----------------------------------------------------

War包放入tomcat

启动tomcat，访问网页地址

本机IP

客户端效果

点击getJSONArray按钮

点击getJSONObject按钮

点击getJSON按钮

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