Create a server program to receive and return data:
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
System. Out. println (request. getmethod (); // obtain the Request
Java performance involves many things. I always wanted to write a summary.
In the first part, we will introduce the class loader, which is mainly used to load the required classes when the Java virtual machine is running.
I. These classes have two
Random random class randomaccessfile
The input stream fileinputstream and output stream fileoutputstream implement sequential read and write of disk files, and create different objects for read and write respectively.
In contrast, the
In the latest project, the function of exporting list data to an Excel table is used. The project uses Apache poi to generate an Excel file.
Due to the complexity of the technology used, I would like to list some implementation details here as a
JVM classloader Architecture:
A, bootstrap classloader/start class loaderIt is mainly responsible for packaging the core API under the jdk_home/lib directory or the jar specified by the-xbootclasspath option.
B. Extension classloader/extension class
In today's multi-layered web application design, we can use both Java Applet and servlet. The applet provides a convenient mechanism for building a powerful dynamic interface. servlet provides an efficient means for Web servers or other application
Android downloads files over the network in two steps:
1. Establish a network connection to obtain data streams;
2. Create a file and write the data stream to the file. (Simple)
Not much nonsense.Code:
Network processing class httpdownloader.
Reprinted please indicate the source!
Link: http://blog.csdn.net/zgyulongfei/article/details/7909006
Sometimes, for various reasons, we need to collect data from a website, but the data display methods for different websites are slightly different!
The openconnection method of the URL returns a urlconnection, which indicates the communication connection between the application and the URL. The program can send a request to the URL through its instance to read the resources referenced by the
Java has developed rapidly in various aspects since its publication, but printing and output have always been the weakest aspect of Java. In fact, Java does not support any printing function. Java1.1 contains a class called printjob in the Java. AWT
Document directory
Download source code:
Download the image from the image address to read the content of the given image file. Use fileinputstream
public static byte[] mReaderPicture(String filePath) {byte[] arr = null;try {File file = new File(
From the previous blog.
Previously, when developing Android programs, we encountered a very slow speed of downloading a large number of images. We can use the image compression method to compress all images to improve transmission efficiency.
The
Android Developers use the POST method to request and send data to the server.The GET method is described above. Now try POST#1. First, use a new servlet to process login requests
package com.wzw.servlet;import java.io.IOException;import
Network Programming series in Android (1): URLConnection
The URL (Uniform Resource Locator) object represents a unified Resource Locator, which is a pointer to Internet resources. The URL consists of the protocol name, host, port, and resource
Java URL and URLConnection
The URL class encapsulates the URL address into an object and provides a method to parse the URL address, such as obtaining the uri, host, and port.
URLConnection is a combination of URL objects and Socket connections,
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