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Core J2ME™ Technology & MIDP phần 8

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Ở đây chúng tôi chọn hay không, chúng tôi muốn các mục được sắp xếp theo ưu tiên (nếu không, chúng xuất hiện theo thứ tự vào). Chúng tôi cũng có thể lựa chọn để có những ưu tiên liệt kê bên cạnh mỗi mục. Hình 12-5. Chọn ưu đãi ứng dụng | Simpo PDF Merge and Split Unregistered Version - http www.simpopdf.com int ch while ch iStrm.read -1 bStrm.write ch Place into image array byte imageData bStrm.toByteArray Create the image from the byte array im Image.createImage imageData 0 imageData.length finally Clean up if iStrm null iStrm.close return im null null im One drawback is the absence of a method to determine the length of the incoming data. However this is not much of a concern simply use a ByteArrayOutputStream to read the data and move the results into the destination array. Client Request Up to this point we have not had a need to send or receive HTTP commands. The objective was simply to create a connection and download a stream of data. It s time to shift gears and learn how to create and manage communication through the HttpConnection class. HTTP is referred to as a request response protocol a client requests information a server sends a response. The most common example is the interaction between a web browser the client and a web server. This section and the next will look at the details of the client request and the server response. Request Method A client request known as the request entity consists of three sections request method header and body. There are three request methods 4 available using HttpConnection see Table 14.3 . 4 Don t confuse the use of the word method in this context with a method in a Java class. Method as it is used here comes directly from the HTTP 1.1 specification as in a client sends a request to the server in the form of a request method. Table 14.3. Request Method javax.microedition.io.HttpConnection Request Description GET Request information data sent as part of URL POST Request information data sent in separate stream HEAD Request only metainformation about a resource 379 Simpo PDF Merge and Split Unregistered Version - http www.simpopdf.com All three request methods inform a server that a client is requesting some type of information. For GET and POST what