throw illegalstateexception

When uploading, downloading, or filtering files, we may need to use the output stream of the page. For example, in JSP: Response. Reset (); Response. setcontenttype ("application/vnd. MS-excel "); Outputstream OS = response. getoutputstream

Extensionloader general use mode #截取 from ServiceConfig code fragment public class Serviceconfig extends Abstractserviceconfig { private static Final long serialversionuid = 3033787999037024738L; private static final Protocol Protocol =

Android obtains the View component width and ViewTreeObserver View width and height measurement method: There are three measurement methods: 1) (executed directly in onCreate) Int w = View. MeasureSpec. makeMeasureSpec (0, View. MeasureSpec.

/** Register a callback function. This callback function is called when the focus status in a view tree changes. * Callback function to be added with the listener Parameter * Exception illegalstateexception if isalive () returns false */

  Preface This chapter is about android. view. ViewTreeObserver. The version is Android 3.0 r1. The translation comes from "bear the brunt". Thanks again "bear the brunt "! I look forward to you join the Android API Chinese translation, contact me

HttpSession interface Definitionpublic interface HttpSessionThis interface is used by the Servlet engine to implement the correlation between HTTP client and HTTP session. This association may persist for a given amount of time in a

Abstractlist provides a skeleton implementation to the list, and its declaration is this:Public abstract class Abstractlist extends Abstractcollection implements ListInherits Abstractcollection, implements the list interface.About Abstractcollection:

SendRequest () In the last article we talked about the SendRequest () method, which goes on to look at the Readresponse method: /** from Httpengine class */public void Readresponse () throws IOException {if (This.userresponse = null) {if (th

Reading good code is as wonderful as watching the beautiful sceneryOkhttp is an open source Java Network Request framework for the square company in GitHub, which is very popular. OkHttp code is not particularly large, the code is a lot of clever

In our JPA HelloWorld, we saw a simple JPA save operation, so let's take a good look at some of the major JPA classes1. Basic several classes:The ①:persistence class is used to get the entitymanagerfactory instance. The class contains a static