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Refine multipart converter registration in HttpMessageConverters

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As of #33894, `HttpMessageConverters` auto-detects converters and use
custom-provided ones to configure a collection of converters for the
client or the server.
Right now the multipart converter is only configured if core converters
(JSON, XML...) are configured/detected. We do not reuse the base
converters (resource, string, byte array) for the multipart converter
as it applies different encoding defaults (ISO for the main ones, UTF-8
for multipart).

This commit refines the configuration to not only include the multipart
converter when core converters are present, but also if any other
converter was configured.

Closes gh-35203
This commit is contained in:
Brian Clozel
2025-07-15 14:45:28 +02:00
parent 2e0cc63616
commit ad007caebc
3 changed files with 34 additions and 11 deletions
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spring-web/src/main/java/org/springframework/http/converter/DefaultHttpMessageConverters.java
+17 -9
View File
@@ -17,8 +17,6 @@
package org.springframework.http.converter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.function.Consumer;
@@ -110,7 +108,9 @@ class DefaultHttpMessageConverters implements HttpMessageConverters {
@Nullable HttpMessageConverter<?> stringMessageConverter;
List<HttpMessageConverter<?>> resourceMessageConverters = Collections.emptyList();
@Nullable HttpMessageConverter<?> resourceMessageConverter;
@Nullable HttpMessageConverter<?> resourceRegionMessageConverter;
@Nullable Consumer<HttpMessageConverter<?>> configurer;
@@ -386,7 +386,7 @@ class DefaultHttpMessageConverters implements HttpMessageConverters {
@Override
public HttpMessageConverters build() {
if (this.registerDefaults) {
this.resourceMessageConverters = Collections.singletonList(new ResourceHttpMessageConverter(false));
this.resourceMessageConverter = new ResourceHttpMessageConverter(false);
detectMessageConverters();
}
List<HttpMessageConverter<?>> allConverters = new ArrayList<>();
@@ -396,8 +396,10 @@ class DefaultHttpMessageConverters implements HttpMessageConverters {
allConverters.addAll(this.getCustomConverters());
allConverters.addAll(this.getBaseConverters());
allConverters.addAll(this.resourceMessageConverters);
if (!partConverters.isEmpty()) {
if (this.resourceMessageConverter != null) {
allConverters.add(this.resourceMessageConverter);
}
if (!partConverters.isEmpty() || !allConverters.isEmpty()) {
allConverters.add(new AllEncompassingFormHttpMessageConverter(partConverters));
}
allConverters.addAll(this.getCoreConverters());
@@ -468,7 +470,8 @@ class DefaultHttpMessageConverters implements HttpMessageConverters {
@Override
public HttpMessageConverters build() {
if (this.registerDefaults) {
this.resourceMessageConverters = Arrays.asList(new ResourceHttpMessageConverter(), new ResourceRegionHttpMessageConverter());
this.resourceMessageConverter = new ResourceHttpMessageConverter();
this.resourceRegionMessageConverter = new ResourceRegionHttpMessageConverter();
detectMessageConverters();
}
List<HttpMessageConverter<?>> allConverters = new ArrayList<>();
@@ -479,8 +482,13 @@ class DefaultHttpMessageConverters implements HttpMessageConverters {
allConverters.addAll(this.getCustomConverters());
allConverters.addAll(this.getBaseConverters());
allConverters.addAll(this.resourceMessageConverters);
if (!partConverters.isEmpty()) {
if (this.resourceMessageConverter != null) {
allConverters.add(this.resourceMessageConverter);
}
if (this.resourceRegionMessageConverter != null) {
allConverters.add(this.resourceRegionMessageConverter);
}
if (!partConverters.isEmpty() || !allConverters.isEmpty()) {
allConverters.add(new AllEncompassingFormHttpMessageConverter(partConverters));
}
allConverters.addAll(this.getCoreConverters());