How to Efficiently Parse a URI String into a Name-Value Collection in Java?

Parse a URI String into Name-Value Collection

The URI parsing task involves extracting the individual parameters and their corresponding values from a URI query string. It's a common need when dealing with URLs in web applications and API requests.

To parse a URI string into a name-value collection in Java, consider the following options:

• Using a Third-Party Library:

Libraries like Apache Commons Lang or Google Guava provide methods for URI parsing. These libraries offer a concise and convenient approach, handling URL-decoding and other common tasks.

• Manual Parsing without a Library:

If you prefer a more hands-on approach, you can implement your own parsing logic as follows:

This method splits the query string into individual pairs, URL-decodes them, and stores them in a Map. You can retrieve individual values using map.get("paramName").

Handling URL-Decoding:

Remember that the query string values may be URL-encoded. You can use the URLDecoder class to convert them to plaintext.

Handling Special Cases:

The parsing logic above assumes that each parameter has a single value. However, some URIs allow multiple values for the same parameter. To handle this case, you can modify the parsing method to create a Map where each parameter maps to a List of values.

Java 8 Stream API:

In Java 8, you can use streams to simplify the parsing process. The following code snippet demonstrates this approach:

This version of the method returns a Map where each key represents a parameter, and the corresponding value is a List of parameter values.

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