DavyJones2010
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DavyJones2010：
knightdf 写道freezingsky 写道这年头代码和 ...
Java SE: How to Decompress File (.zip) -
knightdf：
freezingsky 写道这年头代码和内容都是copy来co ...
Java SE: How to Decompress File (.zip) -
freezingsky：
这年头代码和内容都是copy来copy去的，至少讲一讲过程分析 ...
Java SE: How to Decompress File (.zip)
文章列表
1. Debug无法开启:
ERROR:transport error 202: gethostbyname: unknown host
A configuration error occurred during startup. Please verify the preference field with the prompt: ERROR: transport error 202: gethostbyname: unknown host
ERROR: JDWP Transport dt_socket failed to initialize, TRANSPORT_INIT( ...
All the functionality of ClassLoader is nested in org.apache.catalina.loader.WebappClassLoader
1) Structure of WebappClassLoader
public class WebappClassLoader
extends URLClassLoader
implements Lifecycle{
/**
* The cache of ResourceEntry for classes and resources we have loaded ...
guice web dataflow:
Basic Design Concept:
1) HttpRequest/HttpResponse will always be created by WebContainer(jetty/tomcat) and Guice will reuse/wrap them.
2) For Servlet that match the url pattern in ServletModule, they will be created by Guice instead, their service() will called by guice f ...
The passed 2014 is a really tough and struggling year for me.
During the course of previous 12 months, I wrote a dozens of tec blogs, read a handful books, practiced listening and speaking English, broke up with my beloved ex-girlfriend and then fall in love with the girl who loves me so much. ...
1) Act as a simple log interceptor:
public class DynamicProxy {
private static final Logger logger = Logger.getLogger(DynamicProxy.class);
@SuppressWarnings("unchecked")
@Test
public void useProxyTest() {
String str = "Hello world";
LoggingInvocationHandler handle ...
1> Wrapper
1) Boxing, ==, and equals()
public class WrapperTest {
@Test
public void integerEqualsTest() {
assertFalse(new Integer(127) == new Integer(127));
assertTrue((new Integer(127)).equals(new Integer(127)));
Integer i = 127;
Integer j = 127;
assertTrue(i == j) ...
1. List disk space usage:
df -hl
// "l" means "local", limit listing to local file systems
// "h" means "human-readable", print sizes in human readable format
du -cks *|sort -rn|head
// recurisive sort file size under current folder
2. Sort file by siz ...
1. Insertion Sort
1> Straight Insertion Sort: O(n^2), if the records are already sorted, then O(n).
2> Binary Insertion Sort (Reduced comparison count)
3> 2-Way Insertion Sort (Reduced comparison count and move record time)
4> Shell's Sort
2. Swap Sort
1> Bu ...
package edu.xmu.guava.jcip;
import java.util.Map;
public interface Traversable {
public void addWord(String word, int index);
public Traversable getNext(Character c);
public Map<Character, ? extends Traversable> getChildren();
}
package edu.xmu.guava.jcip;
import java.ut ...
Dealing well with failure, shutdown, and cancellation is one of the characteristics that distinguishes a well-behaved application from one that merely works.
1> Task Cancellation:
An activity is cancellable if external code can move it to completion before its normal completion. There ...
1. Happen Before Operation:
1) Each action in a thread happens before every action in that thread that comes later in the program's order.
2) An unlock on a monitor happens before every subsequent lock on that same monitor.
3) A write to a volatile field happens before every subsequen ...
Use the Advanced Concurrent Tools instead of the legacy wait() and notify().
Java Advanced Concurrent Tools:
1> Executor Framework: ExecutorService, Callable, Executors ...
2> Concurrent Collection: ConcurrentMap, BlockingQueue ... (Is there any ConcurrentSet*(1) and ConcurrentList ...
1.
public String convertExcelToCsv(File uploadedFile, String reportType)
throws InvalidFormatException, IOException, InterruptedException
{
logger.info(String
.format("Start convertExcelToCsv, uploadedFile.name: [%s], reportTYpe: [%s]",
...
1. Risks of Threads:
1> Safety Hazards
We can add annotation: @NotThreadSafe, @ThreadSafe, @Immutable
2> Liveness Hazards
Deadlock, Starvation, Livelock
Bugs that cause liveness failures can be elusive because they depend on the relative timing of event ...
Latches:
A latch is a synchronizer that can delay the process of threads until it reaches its terminal state.
A latch acts as a gate: until the latch reaches the terminal state the gate is closed and no thread can pass, and in the terminal state the gate opens, allowing all threads to pas ...