Android笔记----对服务器XML以及JSON数据的简单解析

服务器搭建

Apache官网最新版Apache HTTP Server 2.4安装方法已经不是傻瓜式的下一步,需要解压完成后进行手动配置相关路径和端口信息,昨天由于端口冲突问题折腾了挺长时间终于搞定了.

最终设置本地ip(localhost)+端口号作为服务器主站,相对应的数据文件也是放在这里面


丢入test.xml以及testjson.json作为测试.



简单思路摘要:

XML

通过HttpClient获取网址中xml文件的数据,再Pull方式解析服务器返回的数据.

JSON

JSON的解析相对清晰,直接把数据返回到JSONArray对象, 并对改对象每个元素的成员调用getString()取出.

But Talk is cheap, show me the code…

新建AndroidProject

1.先在AndroidManifest声明权限

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

2.布局相对简单,只是个按钮监听实现:

在onClick里面回调即可

//解析xml
sendRequestWithHttpURLConnection_xml();
//JSONArray 解析json
sendRequestWithHttpURLConnection_json();
//          GSON解析JSON
sendRequestWithHttpURLConnection_GSON();

具体函数

XML

网站下的test.xml内容为:

<apps>
<app>
<id>626995617</id>
<name>Dh</name>
<version>1.0</version>
</app>

<app>
<id>2</id>
<name>kb</name>
<version>2.0</version>
</app>

<app>
<id>3</id>
<name>lj</name>
<version>3.0</version>
</app>
</apps>

解析的时候是按每个结点(app)进行解析的 ,类似于文件读取操作,遇到结点就判断是否到达文件尾,如果否,则next(app)

public void sendRequestWithHttpURLConnection_xml() {
new Thread(new Runnable() {
@Override
public void run() {
try{
Log.d(TAG,"run");
HttpClient httpClient = new DefaultHttpClient();
//指定地址
HttpGet httpGet = new HttpGet("http://10.15.27.157:8080/test.xml");
HttpResponse httpResponse = httpClient.execute(httpGet);
if (httpResponse.getStatusLine().getStatusCode() == 200) {
Log.d(TAG,"success");
//请求响应成功
HttpEntity entity = httpResponse.getEntity();
String response = EntityUtils.toString(entity,"utf-8");
parseXMLWithPull(response);
}
}catch(Exception e){
e.printStackTrace();
}
}
}).start();
}

private void parseXMLWithPull(String xmlData) {
try {
Log.d(TAG,"parseXMLWithPull");
XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
XmlPullParser xmlPullParser = factory.newPullParser();
xmlPullParser.setInput(new StringReader(xmlData));
int eventType = xmlPullParser.getEventType();
String id = "";
String name = "";
String version = "";
while (eventType != XmlPullParser.END_DOCUMENT) {
//xml未到文件末尾
String nodeNameString = xmlPullParser.getName();
switch (eventType) {
case XmlPullParser.START_TAG:{
if ("id".equals(nodeNameString)) {
id = xmlPullParser.nextText();
}else if ("name".equals(nodeNameString)){
name = xmlPullParser.nextText();
}else if ("version".equals(nodeNameString)){
version = xmlPullParser.nextText();
}
break;
}

case XmlPullParser.END_TAG:{
if ("app".equals(nodeNameString)) {
Log.d(TAG,"id is "+id);
Log.d(TAG,"name is "+name);
Log.d(TAG,"Version is "+version);
}
break;
}
default :
break;
}
eventType = xmlPullParser.next();
}
} catch (Exception e) {
e.printStackTrace();
}
}

解析结果:



JSON

test_json.json内容为:

[
{ "id":"5","version":"5.5","name":"AG" },
{ "id":"6","version":"6.0","name":"Six" },
{ "id":"7","version":"7.0","name":"Seven" }
]

JSON格式数据体积小,但是.json可读性差,可以借助辅助工具

http://www.bejson.com/ 在线解析



这样比较清晰



JSON的解析相对清晰,直接把数据返回到JSONArray对象, 并循环遍历JSONArray对象,对该对象每个元素的成员(id,name,version)调用getString()取出.

private void sendRequestWithHttpURLConnection_json() {
new Thread(new Runnable() {
@Override
public void run() {
try{
Log.d(TAG,"run");
HttpClient httpClient = new DefaultHttpClient();
//指定地址
HttpGet httpGet = new HttpGet("http://10.15.27.157:8080/test_json.json");
HttpResponse httpResponse = httpClient.execute(httpGet);
if (httpResponse.getStatusLine().getStatusCode() == 200) {
Log.d(TAG,"success");
//请求响应成功
HttpEntity entity = httpResponse.getEntity();
String response = EntityUtils.toString(entity,"utf-8");
parseJSONWithJSONObject(response);
}
}catch(Exception e){
e.printStackTrace();
}
}
}).start();
}

private void parseJSONWithJSONObject(String jsonData) {
try {
JSONArray jsonArray = new JSONArray(jsonData);
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject jsonObject = jsonArray.getJSONObject(i);
String id = jsonObject.getString("id");
String name = jsonObject.getString("name");
String version = jsonObject.getString("version");

Log.d(TAG,"id is "+id);
Log.d(TAG,"name is "+name);
Log.d(TAG,"Version is "+version);

}
} catch (Exception e) {
e.printStackTrace();
}
}

解析结果我们通过logcat输出:



GSON解析JSON,相对更加方便

Eclipse 平台,

下载GSON的压缩包 解压得到gson-2.2.4

Step 1 在项目的lib导入gson-2.2.4



Step 2 新建类 Data_GSON

//    GSON解析JSON
private void sendRequestWithHttpURLConnection_GSON() {
new Thread(new Runnable() {
@Override
public void run() {
try{
Log.d(TAG,"GSON解析");
HttpClient httpClient = new DefaultHttpClient();
//指定地址
HttpGet httpGet = new HttpGet("http://10.15.27.157:8080/test_json.json");
HttpResponse httpResponse = httpClient.execute(httpGet);
if (httpResponse.getStatusLine().getStatusCode() == 200) {
Log.d(TAG,"success");
//请求响应成功
HttpEntity entity = httpResponse.getEntity();
String response = EntityUtils.toString(entity,"utf-8");
parseJSONWithG(response);
}
}catch(Exception e){
e.printStackTrace();
}
}
}).start();
}

private void parseJSONWithG(String jsonData) {
Gson gson = new Gson();
List<Data_GSON>appList =
gson.fromJson(jsonData, new TypeToken<List<Data_GSON>>(){}.getType());
for (Data_GSON data_GSON : appList) {
Log.d(TAG,"id is "+ data_GSON.getId());
Log.d(TAG,"name is "+ data_GSON.getName());
Log.d(TAG,"Version is "+ data_GSON.getVersion());
}
}

以上方法同样可以成功解析,代码和上面的JSONArray方法大同小异,关键地方在于

此处解析JSON数据只需要通过自定义的类Data_GSON来进行识别

其实GSON库是将JSON字符串映射成对象,然后匹配相应的成员变量进行获取.

//对JSON数组的统一
Gson gson = new Gson();

List<Data_GSON>appList =
gson.fromJson(jsonData, new TypeToken<List<Data_GSON>>(){}.getType());

程序来源<第一行代码>