本文目录一览：
怎么在android客户端解析json数据
这个格式使用如下代码解析try { JSONObject jsonObject = new JSONObject(json); JSONObject weatherinfo = jsonObject.getJSONObject("weatherinfo"); System.out.println(weatherinfo.getString("city")); System.out.println(weatherinfo.getString("cityid")); System.out.println(weatherinfo.getString("temp")); System.out.println(weatherinfo.getString("WD"));} catch (JSONException e) { e.printStackTrace();} 其中第一行代码 JSONObject jsonObject = new JSONObject(json);//json 即为你的字符串 比如现在天气信息是多个城市的，并非只有北京市。{"weatherinfo":[{"city":"北京","cityid":"101010100","temp":"4","WD":"东风","WS":"2级","SD":"75%","WSE":"2","time":"10:45","isRadar":"1","Radar":"JC_RADAR_AZ9010_JB","njd":"暂无实况","qy":"1011"},{"city":"天津","cityid":"101010100","temp":"4","WD":"东风","WS":"2级","SD":"75%","WSE":"2","time":"10:45","isRadar":"1","Radar":"JC_RADAR_AZ9010_JB","njd":"暂无实况","qy":"1011"}]}以下代码适用。 try { JSONObject jsonObject=new JSONObject(json); JSONArray jsonArray=jsonObject.getJSONArray("weatherinfo"); for (int i=0;ijsonArray.length();i++){ JSONObject object = jsonArray.getJSONObject(i); System.out.println(object.getString("city")); System.out.println(object.getString("cityid")); System.out.println(object.getString("temp")); System.out.println(object.getString("WD")); }} catch (JSONException e) { e.printStackTrace();}
如何解析返回的json格式数据
json数据格式解析我自己分为两种；
一种是普通的，一种是带有数组形式的；
普通形式的：
服务器端返回的json数据格式如下：
复制代码代码如下:
{"userbean":{"Uid":"100196","Showname":"u75afu72c2u7684u7334u5b50","Avtar":null,"State":1}}
分析代码如下：
复制代码代码如下:
// TODO 状态处理 500 200
int res = 0;
res = httpClient.execute(httpPost).getStatusLine().getStatusCode();
if (res == 200) {
/*
* 当返回码为200时，做处理
* 得到服务器端返回json数据，并做处理
* */
HttpResponse httpResponse = httpClient.execute(httpPost);
StringBuilder builder = new StringBuilder();
BufferedReader bufferedReader2 = new BufferedReader(
new InputStreamReader(httpResponse.getEntity().getContent()));
String str2 = "";
for (String s = bufferedReader2.readLine(); s != null; s = bufferedReader2
.readLine()) {
builder.append(s);
}
Log.i("cat", "" + builder.toString());
JSONObject jsonObject = new JSONObject(builder.toString())
.getJSONObject("userbean");
String Uid;
String Showname;
String Avtar;
String State;
Uid = jsonObject.getString("Uid");
Showname = jsonObject.getString("Showname");
Avtar = jsonObject.getString("Avtar");
State = jsonObject.getString("State");
带数组形式的：
服务器端返回的数据格式为：
复制代码代码如下:
{"calendar":
{"calendarlist":
[
{"calendar_id":"1705","title":"(u4eb2u5b50)ddssd","category_name":"u9ed8u8ba4u5206u7c7b","showtime":"1288927800","endshowtime":"1288931400","allDay":false},
{"calendar_id":"1706","title":"(u65c5u884c)","category_name":"u9ed8u8ba4u5206u7c7b","showtime":"1288933200","endshowtime":"1288936800","allDay":false}
]
}
}
分析代码如下：
复制代码代码如下:
// TODO 状态处理 500 200
int res = 0;
res = httpClient.execute(httpPost).getStatusLine().getStatusCode();
if (res == 200) {
/*
* 当返回码为200时，做处理
* 得到服务器端返回json数据，并做处理
* */
HttpResponse httpResponse = httpClient.execute(httpPost);
StringBuilder builder = new StringBuilder();
BufferedReader bufferedReader2 = new BufferedReader(
new InputStreamReader(httpResponse.getEntity().getContent()));
String str2 = "";
for (String s = bufferedReader2.readLine(); s != null; s = bufferedReader2
.readLine()) {
builder.append(s);
}
Log.i("cat", "" + builder.toString());
/**
* 这里需要分析服务器回传的json格式数据，
*/
JSONObject jsonObject = new JSONObject(builder.toString())
.getJSONObject("calendar");
JSONArray jsonArray = jsonObject.getJSONArray("calendarlist");
for(int i=0;ijsonArray.length();i++){
JSONObject jsonObject2 = (JSONObject)jsonArray.opt(i);
CalendarInfo calendarInfo = new CalendarInfo();
calendarInfo.setCalendar_id(jsonObject2.getString("calendar_id"));
calendarInfo.setTitle(jsonObject2.getString("title"));
calendarInfo.setCategory_name(jsonObject2.getString("category_name"));
calendarInfo.setShowtime(jsonObject2.getString("showtime"));
calendarInfo.setEndtime(jsonObject2.getString("endshowtime"));
calendarInfo.setAllDay(jsonObject2.getBoolean("allDay"));
calendarInfos.add(calendarInfo);
}
总结，普通形式的只需用JSONObject ，带数组形式的需要使用JSONArray 将其变成一个list。
json 怎么解析
一、 JSON （JavaScript Object Notation）一种简单的数据格式，比xml更轻巧。
Json建构于两种结构：
1、“名称/值”对的集合（A collection of name/value pairs）。不同的语言中，它被理解为对象（object），纪录（record），结构（struct），字典（dictionary），哈希表（hash table），有键列表（keyed list），或者关联数组 （associative array）。 如：
{
“name”:”jackson”,
“age”:100
}
2、值的有序列表（An ordered list of values）。在大部分语言中，它被理解为数组（array）如：
{
“students”:
[
{“name”:”jackson”,“age”:100},
{“name”:”michael”,”age”:51}
]
}
二、java解析JSON步骤
A、服务器端将数据转换成json字符串
首先、服务器端项目要导入json的jar包和json所依赖的jar包至builtPath路径下（这些可以到JSON-lib官网下载：）
然后将数据转为json字符串，核心函数是：
public static String createJsonString(String key, Object value)
{
JSONObject jsonObject = new JSONObject();
jsonObject.put(key, value);
return jsonObject.toString();
}
B、客户端将json字符串转换为相应的javaBean
1、客户端获取json字符串（因为android项目中已经集成了json的jar包所以这里无需导入）
public class HttpUtil
{
public static String getJsonContent(String urlStr)
{
try
{// 获取HttpURLConnection连接对象
URL url = new URL(urlStr);
HttpURLConnection httpConn = (HttpURLConnection) url
.openConnection();
// 设置连接属性
httpConn.setConnectTimeout(3000);
httpConn.setDoInput(true);
httpConn.setRequestMethod("GET");
// 获取相应码
int respCode = httpConn.getResponseCode();
if (respCode == 200)
{
return ConvertStream2Json(httpConn.getInputStream());
}
}
catch (MalformedURLException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
catch (IOException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
return "";
}
private static String ConvertStream2Json(InputStream inputStream)
{
String jsonStr = "";
// ByteArrayOutputStream相当于内存输出流
ByteArrayOutputStream out = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int len = 0;
// 将输入流转移到内存输出流中
try
{
while ((len = inputStream.read(buffer, 0, buffer.length)) != -1)
{
out.write(buffer, 0, len);
}
// 将内存流转换为字符串
jsonStr = new String(out.toByteArray());
}
catch (IOException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
return jsonStr;
}
}
2、获取javaBean
public static Person getPerson(String jsonStr)
{
Person person = new Person();
try
{// 将json字符串转换为json对象
JSONObject jsonObj = new JSONObject(jsonStr);
// 得到指定json key对象的value对象
JSONObject personObj = jsonObj.getJSONObject("person");
// 获取之对象的所有属性
person.setId(personObj.getInt("id"));
person.setName(personObj.getString("name"));
person.setAddress(personObj.getString("address"));
}
catch (JSONException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
return person;
}
public static ListPerson getPersons(String jsonStr)
{
ListPerson list = new ArrayListPerson();
JSONObject jsonObj;
try
{// 将json字符串转换为json对象
jsonObj = new JSONObject(jsonStr);
// 得到指定json key对象的value对象
JSONArray personList = jsonObj.getJSONArray("persons");
// 遍历jsonArray
for (int i = 0; i personList.length(); i++)
{
// 获取每一个json对象
JSONObject jsonItem = personList.getJSONObject(i);
// 获取每一个json对象的值
Person person = new Person();
person.setId(jsonItem.getInt("id"));
person.setName(jsonItem.getString("name"));
person.setAddress(jsonItem.getString("address"));
list.add(person);
}
}
catch (JSONException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
return list;
}
android 在服务器端生成json格式数据，在客户端怎么解析
因为这次要从服务器端得到Json数据,并且通过解析之后把解析后的数据显示在Android客户端中,首先部署服务器端代码(直接使用Jsp/Servlet):
构造的Json数据如下:
[{"name":"张三","address":"北京","age":20},{"name":"李四","address":"上海","age":30},{"name":"王五","address":"深圳","age":35}]
[一]服务器端(Person.java省略):
①:数据构造JsonService.java
public class JsonService {
public static ListPerson getListPerson() {
ListPerson mLists = new ArrayListPerson();
mLists.add(new Person("张三", "北京", 20));
mLists.add(new Person("李四", "上海", 30));
mLists.add(new Person("王五", "深圳", 35));
return mLists;
}
②:Servlet的代码（包括构造Json数据，没有使用Json数据转换方法）JsonServlet.java
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
response.setCharacterEncoding("UTF-8");
PrintWriter out = response.getWriter();
ListPerson persons = JsonService.getListPerson();
StringBuffer sb = new StringBuffer();
sb.append('[');
for (Person person : persons) {
sb.append('{').append(""name":").append("""+person.getName()+""").append(","); sb.append(""address":").append("""+person.getAddress()+""").append(",");
sb.append(""age":").append(person.getAge());
sb.append('}').append(",");
}
sb.deleteCharAt(sb.length() - 1);
sb.append(']');
out.write(new String(sb));
out.flush();
out.close();
}
③:部署到Tomact 浏览器输入直接访问结果如下:
[{"name":"张三","address":"北京","age":20},{"name":"李四","address":"上海","age":30},{"name":"王五","address":"深圳","age":35}]
至此服务器端代码编码完成，下面进行客户端代码编写; (二)客户端(Person类，和展示数据的布局文件因为简单省去) ①:获取服务器端的Json数据并且解析的工具类JsonParse.java 必要的需要导入的包省去
public class JsonParse {
/**
* 解析Json数据
*
* @param urlPath
* @return mlists
* @throws Exception
*/
public static ListPerson getListPerson(String urlPath) throws Exception {
ListPerson mlists = new ArrayListPerson();
byte[] data = readParse(urlPath);
JSONArray array = new JSONArray(new String(data));
for (int i = 0; i array.length(); i++) {
JSONObject item = array.getJSONObject(i);
String name = item.getString("name");
String address = item.getString("address");
int age = item.getInt("age");
mlists.add(new Person(name, address, age));
}
return mlists;
}
/**
* 从指定的url中获取字节数组
*
* @param urlPath
* @return 字节数组
* @throws Exception
*/
public static byte[] readParse(String urlPath) throws Exception {
ByteArrayOutputStream outStream = new ByteArrayOutputStream();
byte[] data = new byte[1024];
int len = 0;
URL url = new URL(urlPath);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
InputStream inStream = conn.getInputStream();
while ((len = inStream.read(data)) != -1) {
outStream.write(data, 0, len);
}
inStream.close();
return outStream.toByteArray();
}
}
②:主Activity类
public class MainActivity extends Activity {
private Button mButton;
private ListView mListView;
//使用IP不能使用localhost或者127.0.0.1，因为android模拟器默认绑定这个IP，这里应该访问局域网IP
private static final String urlPath = "";
private static final String TAG = "MainActivity";
private ListPerson persons;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mButton = (Button) findViewById(R.id.button1);
mListView = (ListView) findViewById(R.id.listView1);
mButton.setOnClickListener(new MyOnClickListener());
}
private class MyOnClickListener implements OnClickListener {
@Override
public void onClick(View v) {
try {
// 得到Json解析成功之后数据
persons = JsonParse.getListPerson(urlPath);
ListHashMapString, Object data = new ArrayListHashMapString, Object();
for (int i = 0; i persons.size(); i++) {
HashMapString, Object map = new HashMapString, Object();
map.put("name", persons.get(i).getName());
map.put("address", persons.get(i).getAddress());
map.put("age", persons.get(i).getAge());
data.add(map);
}
//初始化适配器，并且绑定数据
SimpleAdapter _Adapter = new SimpleAdapter(MainActivity.this,
data, R.layout.listview_item, new String[] { "name",
"address", "age" }, new int[] { R.id.textView1,
R.id.textView2, R.id.textView3 });
mListView.setAdapter(_Adapter);
} catch (Exception e) {
Toast.makeText(MainActivity.this, "解析失败", 2000).show();
Log.i(TAG, e.toString());
}
}
}
JSON解析。
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
public class BMI
{
public static void main(String[] args)
{
String res =
"{"showapi_res_code":0,"showapi_res_error":"","showapi_res_body":{"ret_code":0,"basic":{"explains":["n. 代码，密码；编码；法典","vt. 编码；制成法典","vi. 指定遗传密码"]}}}";
JSONObject obj = JSONObject.fromString(res);
JSONObject body = obj.getJSONObject("showapi_res_body");
JSONObject basic = body.getJSONObject("basic");
JSONArray explains = basic.getJSONArray("explains");
for(int i = 0; i explains.length(); i++)
{
System.out.println(explains.get(i));
}
}
}