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| <h2 title="Interface JsonReader" class="title">Interface JsonReader</h2> |
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| <dt>All Superinterfaces:</dt> |
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| <pre>public interface <span class="typeNameLabel">JsonReader</span> |
| extends <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/io/Closeable.html?is-external=true" title="class or interface in java.io" class="externalLink">Closeable</a></pre> |
| <div class="block">Reads a JSON <a href="JsonObject.html" title="interface in jakarta.json"><code>object</code></a> or an <a href="JsonArray.html" title="interface in jakarta.json"><code>array</code></a> |
| structure from an input source. |
| |
| <p>The class <a href="Json.html" title="class in jakarta.json"><code>Json</code></a> contains methods to create readers from |
| input sources (<a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/io/InputStream.html?is-external=true" title="class or interface in java.io" class="externalLink"><code>InputStream</code></a> and <a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/io/Reader.html?is-external=true" title="class or interface in java.io" class="externalLink"><code>Reader</code></a>). |
| |
| <p> |
| The following example demonstrates how to read an empty JSON array from |
| a string: |
| <pre> |
| <code> |
| JsonReader jsonReader = Json.createReader(new StringReader("[]")); |
| JsonArray array = jsonReader.readArray(); |
| jsonReader.close(); |
| </code> |
| </pre> |
| |
| <p> |
| The class <a href="JsonReaderFactory.html" title="interface in jakarta.json"><code>JsonReaderFactory</code></a> also contains methods to create |
| <code>JsonReader</code> instances. A factory instance can be used to create |
| multiple reader instances with the same configuration. This the preferred |
| way to create multiple instances. A sample usage is shown in the following |
| example: |
| <pre> |
| <code> |
| JsonReaderFactory factory = Json.createReaderFactory(config); |
| JsonReader reader1 = factory.createReader(...); |
| JsonReader reader2 = factory.createReader(...); |
| </code> |
| </pre></div> |
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| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colSecond" scope="col">Method</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#close()">close</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">Closes this reader and frees any resources associated with the |
| reader.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code><a href="JsonStructure.html" title="interface in jakarta.json">JsonStructure</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#read()">read</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">Returns a JSON array or object that is represented in |
| the input source.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code><a href="JsonArray.html" title="interface in jakarta.json">JsonArray</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#readArray()">readArray</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">Returns a JSON array that is represented in |
| the input source.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code><a href="JsonObject.html" title="interface in jakarta.json">JsonObject</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#readObject()">readObject</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">Returns a JSON object that is represented in |
| the input source.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>default <a href="JsonValue.html" title="interface in jakarta.json">JsonValue</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#readValue()">readValue</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">Returns a JSON value that is represented in |
| the input source.</div> |
| </td> |
| </tr> |
| </table> |
| </li> |
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| </section> |
| </li> |
| </ul> |
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| <h3>Method Detail</h3> |
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| <li class="blockList"> |
| <h4>read</h4> |
| <pre class="methodSignature"><a href="JsonStructure.html" title="interface in jakarta.json">JsonStructure</a> read()</pre> |
| <div class="block">Returns a JSON array or object that is represented in |
| the input source. This method needs to be called |
| only once for a reader instance.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>a JSON object or array</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="JsonException.html" title="class in jakarta.json">JsonException</a></code> - if a JSON object or array cannot |
| be created due to i/o error (IOException would be |
| cause of JsonException)</dd> |
| <dd><code><a href="stream/JsonParsingException.html" title="class in jakarta.json.stream">JsonParsingException</a></code> - if a JSON object or array |
| cannot be created due to incorrect representation</dd> |
| <dd><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/IllegalStateException.html?is-external=true" title="class or interface in java.lang" class="externalLink">IllegalStateException</a></code> - if read, readObject, readArray, |
| readValue or close method is already called</dd> |
| </dl> |
| </li> |
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| <h4>readObject</h4> |
| <pre class="methodSignature"><a href="JsonObject.html" title="interface in jakarta.json">JsonObject</a> readObject()</pre> |
| <div class="block">Returns a JSON object that is represented in |
| the input source. This method needs to be called |
| only once for a reader instance.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>a JSON object</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="JsonException.html" title="class in jakarta.json">JsonException</a></code> - if a JSON object cannot |
| be created due to i/o error (IOException would be |
| cause of JsonException)</dd> |
| <dd><code><a href="stream/JsonParsingException.html" title="class in jakarta.json.stream">JsonParsingException</a></code> - if a JSON object cannot |
| be created due to incorrect representation</dd> |
| <dd><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/IllegalStateException.html?is-external=true" title="class or interface in java.lang" class="externalLink">IllegalStateException</a></code> - if read, readObject, readArray, |
| readValue or close method is already called</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="readArray()"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>readArray</h4> |
| <pre class="methodSignature"><a href="JsonArray.html" title="interface in jakarta.json">JsonArray</a> readArray()</pre> |
| <div class="block">Returns a JSON array that is represented in |
| the input source. This method needs to be called |
| only once for a reader instance.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>a JSON array</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="JsonException.html" title="class in jakarta.json">JsonException</a></code> - if a JSON array cannot |
| be created due to i/o error (IOException would be |
| cause of JsonException)</dd> |
| <dd><code><a href="stream/JsonParsingException.html" title="class in jakarta.json.stream">JsonParsingException</a></code> - if a JSON array cannot |
| be created due to incorrect representation</dd> |
| <dd><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/IllegalStateException.html?is-external=true" title="class or interface in java.lang" class="externalLink">IllegalStateException</a></code> - if read, readObject, readArray, |
| readValue or close method is already called</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="readValue()"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>readValue</h4> |
| <pre class="methodSignature">default <a href="JsonValue.html" title="interface in jakarta.json">JsonValue</a> readValue()</pre> |
| <div class="block">Returns a JSON value that is represented in |
| the input source. This method needs to be called |
| only once for a reader instance.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>a JSON value</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="JsonException.html" title="class in jakarta.json">JsonException</a></code> - if a JSON value |
| be created due to i/o error (IOException would be |
| cause of JsonException)</dd> |
| <dd><code><a href="stream/JsonParsingException.html" title="class in jakarta.json.stream">JsonParsingException</a></code> - if a JSON value |
| cannot be created due to incorrect representation</dd> |
| <dd><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/IllegalStateException.html?is-external=true" title="class or interface in java.lang" class="externalLink">IllegalStateException</a></code> - if read, readObject, readArray, |
| readValue or close method is already called</dd> |
| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>1.1</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="close()"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>close</h4> |
| <pre class="methodSignature">void close()</pre> |
| <div class="block">Closes this reader and frees any resources associated with the |
| reader. This method closes the underlying input source.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/AutoCloseable.html?is-external=true#close()" title="class or interface in java.lang" class="externalLink">close</a></code> in interface <code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/AutoCloseable.html?is-external=true" title="class or interface in java.lang" class="externalLink">AutoCloseable</a></code></dd> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/io/Closeable.html?is-external=true#close()" title="class or interface in java.io" class="externalLink">close</a></code> in interface <code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/io/Closeable.html?is-external=true" title="class or interface in java.io" class="externalLink">Closeable</a></code></dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="JsonException.html" title="class in jakarta.json">JsonException</a></code> - if an i/o error occurs (IOException would be |
| cause of JsonException)</dd> |
| </dl> |
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