这需要花费大量时间从json获取数据。删除并再次安装后，它会在1分钟内获得json，当我再次点击json按钮时，需要花费很多时间而且数据仍未进入listview
这是我的异常代码
E/JSONDemo: IOExceptiojava.net.SocketTimeoutException
at java.net.PlainSocketImpl.read(PlainSocketImpl.java:493)
at java.net.PlainSocketImpl.-wrap0(PlainSocketImpl.java)
at java.net.PlainSocketImpl$PlainSocketInputStream.read(PlainSocketImpl.java:242)
at okio.Okio$2.read(Okio.java:140)
at okio.AsyncTimeout$2.read(AsyncTimeout.java:238)
at okio.RealBufferedSource.indexOf(RealBufferedSource.java:325)
at okio.RealBufferedSource.indexOf(RealBufferedSource.java:314)
at okio.RealBufferedSource.readUtf8LineStrict(RealBufferedSource.java:210)
at okhttp3.internal.http.Http1xStream.readResponse(Http1xStream.java:184)
at okhttp3.internal.http.Http1xStream.readResponseHeaders(Http1xStream.java:125)
at okhttp3.internal.http.HttpEngine.readNetworkResponse(HttpEngine.java:775)
at okhttp3.internal.http.HttpEngine.access$200(HttpEngine.java:86)
at okhttp3.internal.http.HttpEngine$NetworkInterceptorChain.proceed(HttpEngine.java:760)
at okhttp3.internal.http.HttpEngine.readResponse(HttpEngine.java:613)
at okhttp3.RealCall.getResponse(RealCall.java:244)
at okhttp3.RealCall$ApplicationInterceptorChain.proceed(RealCall.java:201)
at okhttp3.RealCall.getResponseWithInterceptorChain(RealCall.java:163)
at okhttp3.RealCall.access$100(RealCall.java:30)
at okhttp3.RealCall$AsyncCall.execute(RealCall.java:127)
at okhttp3.internal.NamedRunnable.run(NamedRunnable.java:32)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
at java.lang.Thread.run(Thread.java:818)
这是java文件中的json代码：
progress = ProgressDialog.show(MainActivity.this, "dialog title", "dialog message", true);
Toast.makeText(MainActivity.this, "ok", Toast.LENGTH_LONG).show();
if (isNetworkAvailable()) {
String url = "ConstantValue.URL";
RequestBody formBody = new FormBody.Builder()
.add(employeeId, value)
.build();
try {
post(url, formBody, new Callback() {
@Override
public void onFailure(Call call, IOException e) {
Log.e("JSONDemo", "IOException", e);
}
@Override
public void onResponse(final Call call, final Response response) throws IOException {
String JSON = response.body().string();
Log.e("res", " " + JSON);
try {
JSONObject jsonObj = new JSONObject(JSON);
JSONArray resultarr = jsonObj.getJSONArray("result");
final JSONArray resultarr1 = jsonObj.getJSONArray("result1");
if (resultarr1.length() == 0) {
showAlertDialog("API", "Data Unavailable");
} else {
for (int i = 0; i < resultarr1.length(); i++) {
Employee emp = new Employee();
JSONObject result1obj = resultarr1.getJSONObject(i);
String result1Id = result1obj.getString("ID");
String result1Name = result1obj.getString("NAME");
String result1Value = result1obj.getString("VALUE");
Log.e("result", " " + result1Name);
Log.e("result", " " + result1Value);
Log.e("result", " " + result1Id);
emp.setValue(result1Value);
emp.setName(result1Name);
emp.setId(result1Id);
arr.add(emp);
}
}
runOnUiThread(new Runnable() {
@Override
public void run() {
// you can access all the UI componenet
if (progress.isShowing())
progress.dismiss();
cu.notifyDataSetChanged();
}
});
} catch (Exception e) {
Log.e("JSONDemo", "onResponse", e);
showAlertDialog("API","Something went wrong");
}
}
});
} catch (Exception e) {
Log.e("JSONDemo", "Post Exception", e);
}
} else {
Toast.makeText(MainActivity.this, "Internet not available", Toast.LENGTH_LONG).show();
}
}
其他代码：
private final OkHttpClient client = new OkHttpClient();
Call post(String url, RequestBody formBody, Callback callback) throws IOException {
Request request = new Request.Builder()
.url(url)
.post(formBody)
.build();
client.setConnectTimeout(30, TimeUnit.SECONDS);
client.setReadTimeout(30, TimeUnit.SECONDS);
client.setWriteTimeout(30, TimeUnit.SECONDS);
Call call = client.newCall(request);
call.enqueue(callback);
return call;
}
答案 0 :(得分：27)
IOExceptiojava.net.SocketTimeoutException 发生在以下情况。
OkHttpClient client = new OkHttpClient（）;
client.setConnectTimeout(30, TimeUnit.SECONDS);
client.setReadTimeout(30, TimeUnit.SECONDS);
client.setWriteTimeout(30, TimeUnit.SECONDS);
如果您使用的是okhttp3，则必须使用构建器执行此操作。
OkHttpClient.Builder builder = new OkHttpClient.Builder();
builder.connectTimeout(30, TimeUnit.SECONDS);
builder.readTimeout(30, TimeUnit.SECONDS);
builder.writeTimeout(30, TimeUnit.SECONDS);
client = builder.build();
答案 1 :(得分：1)
仅添加此内容不会解决您的问题：
class App extends React.Component {
constructor() {
super()
this.state = {
todos: todoData
}
this.handleChange = this.handleChange.bind(this)
}
handleChange(id) {
this.setState(prevState => {
const updatedTodos = prevState.todos.map(todo => {
if (todo.id === id) {
todo.completed = !todo.completed
}
return todo
})
return {
todos: updatedTodos
}
})
}
render() {
const todoItems = this.state.todos.map(item => <TodoItem key={item.id} item={item} handleChange={this.handleChange}/>)
return (
<div className="todo-list">
{todoItems}
</div>
)
}
}
如果您使用的是 Kotlin + Retrofit + Coroutines ，则只需对网络操作使用function TodoItem(props) {
return (
<div className="todo-item">
<input
type="checkbox"
checked={props.item.completed}
onChange={() => props.handleChange(props.item.id)}
/>
<p>{props.item.text}</p>
</div>
)
}
和let values = ["VAL1", "VAL2", "VAL3"]
let format = "Val 1 -> %1$@ Val 2 -> %2$@ Val 3 -> %3$@"
let varArg: CVarArg = // How to convert array to CVarArg?
let result = String(format: format, varArg)
OkHttpClient.Builder()
.connectTimeout(10, TimeUnit.SECONDS)
.readTimeout(10, TimeUnit.SECONDS)
.writeTimeout(10, TimeUnit.SECONDS)
其中，异常是try而不是catch
这将处理所有类似的异常，
这是我的viewModelScope.launch(Dispatchers.IO) {
try {
val userListResponseModel = apiEndPointsInterface.usersList()
returnusersList(userListResponseModel)
} catch (e: Exception) {
e.printStackTrace()
}
}
函数
kotlin