How to append string in text file using java

Files along with java. PrintWriter 's println method, can then be called to write to the file. The StandardOpenOption parameters used in this code: opens the file for writing, only appends to the file, and creates the file if it does not exist. And Charset. If we are using Java 7 and above and also know the content to be added appended to the file we can make use of newBufferedWriter method in NIO package. Though OP has not asked but just in case we want to search for lines having some specific keyword e.

Guys you got to remember that you guys are calling active threads that you are not calling asynchronously and since it would likely be a good 5 to 10 pages to get it done right. Why not spend more time on your project and forget about writing anything already written. I might suggest the apache commons project.

This project already provides a framework for doing what you need i. Alternatively using FileUtils :. It is not efficient but works fine. Line breaks are handled correctly and a new file is created if one didn't exist yet.

We are constructing a FileWriter object in append mode. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. How to append text to an existing file in Java?

Ask Question. Asked 12 years, 2 months ago. Active 12 months ago. Viewed 1. I need to append text repeatedly to an existing file in Java. How do I do that? Steve Chambers Add a comment. Active Oldest Votes. If the file does not exist, it will be created. Using a BufferedWriter is recommended for an expensive writer such as FileWriter. Using a PrintWriter gives you access to println syntax that you're probably used to from System.

But the BufferedWriter and PrintWriter wrappers are not strictly necessary. Dave Jarvis Kip Kip k 85 85 gold badges silver badges bronze badges. You should either use java7 try-with-resources or put the close in a finally block, in order to make sure that the file is closed in case of exception — Svetlin Zarev. Lets imagine that new BufferedWriter Caution, the "Older java" example will not properly close the stream if an exception is thrown inside the try block.

A couple of possible "gotchas" with the Java 7 method: 1 If the file doesn't already exist, StandardOpenOption. Create String from Contents of a File. Append Text to an Existing File. Convert File to byte array and Vice-Versa. Create Directories. Get all Files Present in a Directory. Related Topics Java File Class. Java FileOutputStream Class. Java Program to Append Text to an Existing File In this program, you'll learn different techniques to append text to an existing file in Java.

To understand this example, you should have the knowledge of the following Java programming topics: Java File Class Java Exception Handling Before we append text to an existing file, we assume we have a file named test. Here's the content of test. Example 1: Append text to existing file import java. IOException; import java. Return Value : The method returns the string after the append operation is performed.

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