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With JQuickCurl, you can describe curl-style JSON requests on Java interface methods using @JCurlCommand, then invoke those methods through a proxy. The pattern covers GET, POST, PUT, and DELETE; a JQuickCurlReq supplies runtime values for URL and body placeholders, while each method’s return type describes how to handle the response. The examples below follow the tutorial’s ReqRes mock-API pattern; they illustrate the library’s documented usage, not a live check of that API.
How annotation-mode requests fit together
Each interface method holds a curl-style command in its @JCurlCommand annotation. That command specifies the HTTP verb, URL, headers, and, when needed, a data body. At invocation time, the caller supplies values for placeholders such as ${id} through a JQuickCurlReq object. A proxy created with JCurlInvoker.createProxy(...) connects the interface method call to the request.
In this pattern, the Java method name does not have to match the HTTP verb or URL. The annotation describes the request, and the declared Java return type indicates the intended response conversion.
Describe the four JSON requests
The tutorial’s examples use ReqRes as a mock API and demonstrate a basic create, read, update, and delete sequence. The snippets below show the command shapes; use the actual endpoint and annotation syntax from the project’s current documentation when integrating them.
GET: read a resource
Put a resource URL with an ${id} placeholder in the annotated command. Supply the ID in the request object when invoking the method. The method can return the response body as text or request JSON-to-object conversion with a domain type.
POST: create a resource
For a JSON POST, the command includes a data body and a Content-Type: application/json header. Put variable fields in the body as placeholders, for example ${name} and ${job}, then populate them on the request object before calling the proxy method.
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PUT: update a resource
A PUT follows the same JSON-body pattern as POST, but the URL identifies the resource to update, often with an ${id} placeholder. Supply the ID and updated body values through JQuickCurlReq.
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DELETE: remove a resource
DELETE targets the resource URL, again using a runtime ID if required. The tutorial uses Void when the caller does not need a response body, and states that its shown ReqRes delete returns HTTP 204. That is the example’s stated behavior, not confirmation that the endpoint currently responds that way.
Pass runtime values through JQuickCurlReq
The request object provides the values that replace placeholders in the annotated command. For example, the tutorial shows calls such as request.put("id", 2) and request.put("name", "Ada"). The interface instance is produced with JCurlInvoker.createProxy(...); calling one of its methods with the populated request triggers the corresponding annotated request.
This separation keeps request structure in the interface while allowing IDs and JSON field values to vary from one invocation to another. Keep placeholder names in the command and keys supplied to the request object aligned.
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Choose a return type for the response
The tutorial describes several response styles. Choose according to what the calling code needs rather than returning a typed value by default.
| Return type | Intended handling |
|---|---|
String |
Keep the raw response body as text. |
| POJO | Convert a JSON object into a Java domain object. |
List<T> |
Handle a JSON array as a collection of elements of type T. |
Void |
Discard the response body when the caller does not need it. |
byte[] or a result-wrapper type |
Also listed by the tutorial as supported response styles; its examples do not establish details for every use case. |
These are the conversion behaviors described in the tutorial, not independent performance or compatibility test results.
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Understand the scope and compatibility caveat
The project README describes JQuickCurl as a Java library for parsing and executing curl-style requests, with annotation-based requests, XML configuration, dynamic proxies, and response conversion. It also lists methods beyond this tutorial’s four verbs, including PATCH, HEAD, OPTIONS, and TRACE. These are project documentation claims rather than independently verified behavior.
The repository cautions: “JQuickCurl is not a complete replacement for the system curl command.” An annotation that accepts a curl-style command does not guarantee support for every option accepted by the standalone curl program. For an unlisted option or HTTP method, check the current parser and test cases before depending on it.
Project version noted in the README
The project README reports Maven version 2.2.0. This is the version stated in that README, not an independently checked package-registry release; confirm the version and dependency coordinates in the project documentation before adding it to a build.
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