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| <div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">jakarta.ws.rs.ext</a></div> |
| <h2 title="Interface MessageBodyWriter" class="title">Interface MessageBodyWriter<T></h2> |
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| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>T</code> - the type that can be written.</dd> |
| </dl> |
| <hr> |
| <pre>public interface <span class="typeNameLabel">MessageBodyWriter<T></span></pre> |
| <div class="block">Contract for a provider that supports the conversion of a Java type to a stream. |
| |
| A <code>MessageBodyWriter</code> implementation may be annotated with <a href="../Produces.html" title="annotation in jakarta.ws.rs"><code>Produces</code></a> to restrict the media |
| types for which it will be considered suitable. The <code>MessageBodyWriter</code> pipeline is only invoked if there is |
| a non-null response entity. |
| <p> |
| Providers implementing <code>MessageBodyWriter</code> contract must be either programmatically registered in a JAX-RS |
| runtime or must be annotated with <a href="Provider.html" title="annotation in jakarta.ws.rs.ext"><code>@Provider</code></a> annotation to be automatically |
| discovered by the JAX-RS runtime during a provider scanning phase. |
| </p></div> |
| <dl> |
| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>1.0</dd> |
| <dt><span class="simpleTagLabel">Author:</span></dt> |
| <dd>Paul Sandoz, Marc Hadley</dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="Provider.html" title="annotation in jakarta.ws.rs.ext"><code>Provider</code></a>, |
| <a href="../Produces.html" title="annotation in jakarta.ws.rs"><code>Produces</code></a></dd> |
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| <h3>Method Summary</h3> |
| <table class="memberSummary"> |
| <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t3" class="tableTab"><span><a href="javascript:show(4);">Abstract Methods</a></span><span class="tabEnd"> </span></span><span id="t5" class="tableTab"><span><a href="javascript:show(16);">Default Methods</a></span><span class="tabEnd"> </span></span></caption> |
| <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>default long</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getSize(T,java.lang.Class,java.lang.reflect.Type,java.lang.annotation.Annotation%5B%5D,jakarta.ws.rs.core.MediaType)">getSize</a></span>​(<a href="MessageBodyWriter.html" title="type parameter in MessageBodyWriter">T</a> t, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang" class="externalLink">Class</a><?> type, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/reflect/Type.html?is-external=true" title="class or interface in java.lang.reflect" class="externalLink">Type</a> genericType, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/annotation/Annotation.html?is-external=true" title="class or interface in java.lang.annotation" class="externalLink">Annotation</a>[] annotations, |
| <a href="../core/MediaType.html" title="class in jakarta.ws.rs.core">MediaType</a> mediaType)</code></th> |
| <td class="colLast"> |
| <div class="block">Originally, the method has been called before <code>writeTo</code> to ascertain the length in bytes of the serialized form |
| of <code>t</code>.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#isWriteable(java.lang.Class,java.lang.reflect.Type,java.lang.annotation.Annotation%5B%5D,jakarta.ws.rs.core.MediaType)">isWriteable</a></span>​(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang" class="externalLink">Class</a><?> type, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/reflect/Type.html?is-external=true" title="class or interface in java.lang.reflect" class="externalLink">Type</a> genericType, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/annotation/Annotation.html?is-external=true" title="class or interface in java.lang.annotation" class="externalLink">Annotation</a>[] annotations, |
| <a href="../core/MediaType.html" title="class in jakarta.ws.rs.core">MediaType</a> mediaType)</code></th> |
| <td class="colLast"> |
| <div class="block">Ascertain if the MessageBodyWriter supports a particular type.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#writeTo(T,java.lang.Class,java.lang.reflect.Type,java.lang.annotation.Annotation%5B%5D,jakarta.ws.rs.core.MediaType,jakarta.ws.rs.core.MultivaluedMap,java.io.OutputStream)">writeTo</a></span>​(<a href="MessageBodyWriter.html" title="type parameter in MessageBodyWriter">T</a> t, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang" class="externalLink">Class</a><?> type, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/reflect/Type.html?is-external=true" title="class or interface in java.lang.reflect" class="externalLink">Type</a> genericType, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/annotation/Annotation.html?is-external=true" title="class or interface in java.lang.annotation" class="externalLink">Annotation</a>[] annotations, |
| <a href="../core/MediaType.html" title="class in jakarta.ws.rs.core">MediaType</a> mediaType, |
| <a href="../core/MultivaluedMap.html" title="interface in jakarta.ws.rs.core">MultivaluedMap</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>,​<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang" class="externalLink">Object</a>> httpHeaders, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/io/OutputStream.html?is-external=true" title="class or interface in java.io" class="externalLink">OutputStream</a> entityStream)</code></th> |
| <td class="colLast"> |
| <div class="block">Write a type to an HTTP message.</div> |
| </td> |
| </tr> |
| </table> |
| </li> |
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| </section> |
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| <a id="isWriteable(java.lang.Class,java.lang.reflect.Type,java.lang.annotation.Annotation[],jakarta.ws.rs.core.MediaType)"> |
| <!-- --> |
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| <h4>isWriteable</h4> |
| <pre class="methodSignature">boolean isWriteable​(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang" class="externalLink">Class</a><?> type, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/reflect/Type.html?is-external=true" title="class or interface in java.lang.reflect" class="externalLink">Type</a> genericType, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/annotation/Annotation.html?is-external=true" title="class or interface in java.lang.annotation" class="externalLink">Annotation</a>[] annotations, |
| <a href="../core/MediaType.html" title="class in jakarta.ws.rs.core">MediaType</a> mediaType)</pre> |
| <div class="block">Ascertain if the MessageBodyWriter supports a particular type.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>type</code> - the class of instance that is to be written.</dd> |
| <dd><code>genericType</code> - the type of instance to be written, obtained either by reflection of a resource method return type |
| or via inspection of the returned instance. <a href="../core/GenericEntity.html" title="class in jakarta.ws.rs.core"><code>GenericEntity</code></a> provides a way to specify this |
| information at runtime.</dd> |
| <dd><code>annotations</code> - an array of the annotations attached to the message entity instance.</dd> |
| <dd><code>mediaType</code> - the media type of the HTTP entity.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd><code>true</code> if the type is supported, otherwise <code>false</code>.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="getSize(java.lang.Object,java.lang.Class,java.lang.reflect.Type,java.lang.annotation.Annotation[],jakarta.ws.rs.core.MediaType)"> |
| <!-- --> |
| </a><a id="getSize(T,java.lang.Class,java.lang.reflect.Type,java.lang.annotation.Annotation[],jakarta.ws.rs.core.MediaType)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getSize</h4> |
| <pre class="methodSignature">default long getSize​(<a href="MessageBodyWriter.html" title="type parameter in MessageBodyWriter">T</a> t, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang" class="externalLink">Class</a><?> type, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/reflect/Type.html?is-external=true" title="class or interface in java.lang.reflect" class="externalLink">Type</a> genericType, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/annotation/Annotation.html?is-external=true" title="class or interface in java.lang.annotation" class="externalLink">Annotation</a>[] annotations, |
| <a href="../core/MediaType.html" title="class in jakarta.ws.rs.core">MediaType</a> mediaType)</pre> |
| <div class="block">Originally, the method has been called before <code>writeTo</code> to ascertain the length in bytes of the serialized form |
| of <code>t</code>. A non-negative return value has been used in a HTTP <code>Content-Length</code> header. |
| <p> |
| As of JAX-RS 2.0, the method has been deprecated and the value returned by the method is ignored by a JAX-RS runtime. |
| All <code>MessageBodyWriter</code> implementations are advised to return <code>-1</code> from the method. Responsibility to |
| compute the actual <code>Content-Length</code> header value has been delegated to JAX-RS runtime. |
| </p></div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>t</code> - the instance to write</dd> |
| <dd><code>type</code> - the class of instance that is to be written.</dd> |
| <dd><code>genericType</code> - the type of instance to be written. <a href="../core/GenericEntity.html" title="class in jakarta.ws.rs.core"><code>GenericEntity</code></a> provides a way to |
| specify this information at runtime.</dd> |
| <dd><code>annotations</code> - an array of the annotations attached to the message entity instance.</dd> |
| <dd><code>mediaType</code> - the media type of the HTTP entity.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>length in bytes or -1 if the length cannot be determined in advance.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="writeTo(java.lang.Object,java.lang.Class,java.lang.reflect.Type,java.lang.annotation.Annotation[],jakarta.ws.rs.core.MediaType,jakarta.ws.rs.core.MultivaluedMap,java.io.OutputStream)"> |
| <!-- --> |
| </a><a id="writeTo(T,java.lang.Class,java.lang.reflect.Type,java.lang.annotation.Annotation[],jakarta.ws.rs.core.MediaType,jakarta.ws.rs.core.MultivaluedMap,java.io.OutputStream)"> |
| <!-- --> |
| </a> |
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| <h4>writeTo</h4> |
| <pre class="methodSignature">void writeTo​(<a href="MessageBodyWriter.html" title="type parameter in MessageBodyWriter">T</a> t, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang" class="externalLink">Class</a><?> type, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/reflect/Type.html?is-external=true" title="class or interface in java.lang.reflect" class="externalLink">Type</a> genericType, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/annotation/Annotation.html?is-external=true" title="class or interface in java.lang.annotation" class="externalLink">Annotation</a>[] annotations, |
| <a href="../core/MediaType.html" title="class in jakarta.ws.rs.core">MediaType</a> mediaType, |
| <a href="../core/MultivaluedMap.html" title="interface in jakarta.ws.rs.core">MultivaluedMap</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>,​<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang" class="externalLink">Object</a>> httpHeaders, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/io/OutputStream.html?is-external=true" title="class or interface in java.io" class="externalLink">OutputStream</a> entityStream) |
| throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io" class="externalLink">IOException</a>, |
| <a href="../WebApplicationException.html" title="class in jakarta.ws.rs">WebApplicationException</a></pre> |
| <div class="block">Write a type to an HTTP message. The message header map is mutable but any changes must be made before writing to the |
| output stream since the headers will be flushed prior to writing the message body.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>t</code> - the instance to write.</dd> |
| <dd><code>type</code> - the class of instance that is to be written.</dd> |
| <dd><code>genericType</code> - the type of instance to be written. <a href="../core/GenericEntity.html" title="class in jakarta.ws.rs.core"><code>GenericEntity</code></a> provides a way to |
| specify this information at runtime.</dd> |
| <dd><code>annotations</code> - an array of the annotations attached to the message entity instance.</dd> |
| <dd><code>mediaType</code> - the media type of the HTTP entity.</dd> |
| <dd><code>httpHeaders</code> - a mutable map of the HTTP message headers.</dd> |
| <dd><code>entityStream</code> - the <a href="https://docs.oracle.com/javase/8/docs/api/java/io/OutputStream.html?is-external=true" title="class or interface in java.io" class="externalLink"><code>OutputStream</code></a> for the HTTP entity. The implementation must not close the output |
| stream.</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io" class="externalLink">IOException</a></code> - if an IO error arises.</dd> |
| <dd><code><a href="../WebApplicationException.html" title="class in jakarta.ws.rs">WebApplicationException</a></code> - if a specific HTTP error response needs to be produced. Only effective if |
| thrown prior to the message being committed.</dd> |
| </dl> |
| </li> |
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