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Detailed graphic and text explanation of garbled file reading problem in Java

When Java reads a file, if you do not specify the encoding format, it will use the default character set in the local environment. When the text encoding format is different from the local one, garbled characters will appear. We can specify the encoding format when reading the file to avoid garbled characters.

Nov 28, 2019 am 11:06 AM

java

How to solve the problem of garbled characters when uploading web projects in Java

The way to solve the problem of garbled characters when uploading "web" projects in "java" is: it can be solved by "Filter". First define a class to implement "Filter" and declare a "doFilter" method in the class, and then in this method Just set the requested character set and release the request to the destination address.

Nov 28, 2019 am 11:00 AM

java web upload Garbled characters

Solution to garbled code when java inserts data into mysql

The solution to the garbled code when java inserts data into mysql: Just add the encoding format when connecting to the mysql database in java. When connecting to the database, add "?characterEncoding=UTF-8" after the database name to add the encoding format.

Nov 28, 2019 am 10:52 AM

java

Implementation in java to determine whether a file exists and create it if it does not exist

The way to determine whether a file exists in "java" and create it if it does not exist is: first define an object to save the file path that needs to be determined, then call the "exists" method combined with the "if" loop to make a preliminary determination, and then use exceptions If the implementation file does not exist, just create it.

Nov 28, 2019 am 10:47 AM

java create judgment exist document

Two ways to get the day of the week of a date in java

How to get the day of the week of a date in Java: 1. Use the Calendar class to get the day of the week. Note that the week obtained by this method starts on Sunday. 2. Use the SimpleDateFormat class to get the day of the week, and use the parameter "EEEE" to get it.

Nov 28, 2019 am 10:36 AM

java

Detailed explanation of the method to determine whether it is a leap year in Java

How to determine whether it is a leap year in Java: Use the if statement in Java code to determine whether it is a leap year by determining whether the year is divisible by 4, not divisible by 100, or divisible by 400.

Nov 28, 2019 am 10:25 AM

java

Detailed explanation of the causes and solutions of garbled characters in Java

The reason for garbled characters: It is caused by the inconsistency between the original encoding format of the string and the encoding format used for parsing when reading. Solution: Just change the encoding format of the garbled text in the java code.

Nov 28, 2019 am 10:11 AM

java Garbled characters

How to determine whether a string is an int in java

The method of judging whether a string is "int" in "java" is: first judge the length of the string that needs to be judged. If the length of the string is not 0, then use the "charAt" method to judge whether the specified index character in the string is "int", finally use loop judgment.

Nov 28, 2019 am 09:59 AM

int java judgment string

java error: symbol not found

The "symbol not found" error reported in Java is generally because the corresponding class is not introduced in the code. This article takes the Arrays method as an example to introduce the reasons and solutions for the error "symbol not found" when the Arrays class is not introduced.

Nov 28, 2019 am 09:57 AM

java

Java error: Reasons and solutions for main class not found or unable to be loaded

Reason for the error: This problem often occurs because the java source file contains the package name. Solution: 1. Delete the package name from the source file (not recommended). 2. Create a file path structure under code that is the same as the package name.

Nov 28, 2019 am 09:45 AM

java

How to determine whether a string consists of characters in java

The method to determine whether a string is composed of characters in "java" is: first define a regular expression for determination, for example: "^[a-zA-Z]*", and then by calling the "matches" method, you will need Just match the determined string with the defined regular expression.

Nov 28, 2019 am 09:44 AM

java judgment character string

Java custom error page implementation method

How to specify an error page in java: customize the error page and call the customized page in web.xml. When the service throws a 404 or 500 exception, the servlet service will look in web.xml to find out whether error-page and error-code are set to call a custom error page.

Nov 28, 2019 am 09:35 AM

java

How to determine whether char is a space in java

The method to determine whether "char" is a space in "java" is: first save the string to be determined into a character array by calling the "toCharArray" method, and then use the "for" loop to determine the length of the character array, and judge by the length to determine whether "char" is a space.

Nov 28, 2019 am 09:22 AM

char java judgment space

What does this in java mean?

This in java represents the class instance itself. Usage of this keyword: 1. This keyword can be used to reference instance variables of the current class. 2. You can use the this keyword to call methods of the current class. 3. The this() constructor can be used to call the constructor of the current class.

Nov 28, 2019 am 09:20 AM

java