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Java 反射最佳实践 - 更多技术 - 清泛网 - 专注C/C++及内核技术
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我们之前写反射都是要这么写：
public static <T> T create(HttpRequest httpRequest) {
Object httpRequestEntity = null;
try {
Class<T> httpRequestEntityCls = (Class<T>) Class.forName(HttpProcessor.PACKAGE_NAME + "." + HttpProcessor.CLASS_NAME);
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Using multiple delimiters in awk
... the text between []:
Use awk -F'[][]' but awk -F'[[]]' will not work.
http://stanlo45.blogspot.com/2020/06/awk-multiple-field-separators.html
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Forward an invocation of a variadic function in C
...a va_list instead of a variable number of arguments, you can't do it. See http://c-faq.com/varargs/handoff.html.
Example:
void myfun(const char *fmt, va_list argp) {
vfprintf(stderr, fmt, argp);
}
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How to do a PUT request with curl?
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Using the -X flag with whatever HTTP verb you want:
curl -X PUT -d arg=val -d arg2=val2 localhost:8080
This example also uses the -d flag to provide arguments with your PUT request.
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How do I make an HTTP request in Swift?
...g Language Swift by Apple in iBooks, but cannot figure out how to make an HTTP request (something like cURL) in Swift. Do I need to import Obj-C classes or do I just need to import default libraries? Or is it not possible to make an HTTP request based on native Swift code?
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How do I make a column unique and index it in a Ruby on Rails migration?
.... :column_name_n], unique: true, name: 'my_custom_index_name'
More info - http://apidock.com/rails/ActiveRecord/ConnectionAdapters/SchemaStatements/add_index
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How to create a drop shadow only on one side of an element?
...rength/opacity of the shadow. Here's a new fiddle, using pseudo-elements:
http://jsfiddle.net/UnsungHero97/ARRRZ/2/
HTML
<div id="box" class="box-shadow"></div>
CSS
#box {
background-color: #3D6AA2;
width: 160px;
height: 90px;
margin-top: -45px;
margin-left: -80...
SQL Server: Examples of PIVOTing String data
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From http://blog.sqlauthority.com/2008/06/07/sql-server-pivot-and-unpivot-table-examples/:
SELECT CUST, PRODUCT, QTY
FROM Product) up
PIVOT
( SUM(QTY) FOR PRODUCT IN (VEG, SODA, MILK, BEER, CHIPS)) AS pvt) p
UNPIVOT
(QTY FOR PROD...
Why Func instead of Predicate?
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Scala: List[Future] to Future[List] disregarding failed futures
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