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Add option to set Content-Length in JSON Views

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MappingJackson2JsonView and MappingJacksonJsonView now provide an
option that will set the Content-Length header of JSON responses.
Use of the option implies buffering of the response and it must be
enabled explicitly.

Issue: SPR-7866
This commit is contained in:
Rossen Stoyanchev
2012-05-15 18:06:14 -04:00
parent 2017b24867
commit 01a9dd9772
5 changed files with 53 additions and 9 deletions
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21
spring-webmvc/src/main/java/org/springframework/web/servlet/view/json/MappingJackson2JsonView.java
View File

@@ -16,6 +16,8 @@
package org.springframework.web.servlet.view.json;
import java.io.ByteArrayOutputStream;
import java.io.OutputStream;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
@@ -71,6 +73,7 @@ public class MappingJackson2JsonView extends AbstractView {
private boolean disableCaching = true;
private boolean updateContentLength = false;
/**
* Construct a new {@code JacksonJsonView}, setting the content type to {@code application/json}.
@@ -199,6 +202,15 @@ public class MappingJackson2JsonView extends AbstractView {
this.disableCaching = disableCaching;
}
/**
* Whether to update the 'Content-Length' header of the response. When set to
* {@code true}, the response is buffered in order to determine the content
* length and set the 'Content-Length' header of the response.
* <p>The default setting is {@code false}.
*/
public void setUpdateContentLength(boolean updateContentLength) {
this.updateContentLength = updateContentLength;
}
@Override
protected void prepareResponse(HttpServletRequest request, HttpServletResponse response) {
@@ -215,9 +227,10 @@ public class MappingJackson2JsonView extends AbstractView {
protected void renderMergedOutputModel(Map<String, Object> model, HttpServletRequest request,
HttpServletResponse response) throws Exception {
OutputStream stream = this.updateContentLength ? createTemporaryOutputStream() : response.getOutputStream();
Object value = filterModel(model);
JsonGenerator generator =
this.objectMapper.getJsonFactory().createJsonGenerator(response.getOutputStream(), this.encoding);
JsonGenerator generator = this.objectMapper.getJsonFactory().createJsonGenerator(stream, this.encoding);
// A workaround for JsonGenerators not applying serialization features
// https://github.com/FasterXML/jackson-databind/issues/12
@@ -229,6 +242,10 @@ public class MappingJackson2JsonView extends AbstractView {
generator.writeRaw("{} && ");
}
this.objectMapper.writeValue(generator, value);
if (this.updateContentLength) {
writeToResponse(response, (ByteArrayOutputStream) stream);
}
}
/**

24
spring-webmvc/src/main/java/org/springframework/web/servlet/view/json/MappingJacksonJsonView.java
View File

@@ -1,5 +1,5 @@
/*
* Copyright 2002-2011 the original author or authors.
* Copyright 2002-2012 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@@ -16,6 +16,8 @@
package org.springframework.web.servlet.view.json;
import java.io.ByteArrayOutputStream;
import java.io.OutputStream;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
@@ -73,6 +75,7 @@ public class MappingJacksonJsonView extends AbstractView {
private boolean disableCaching = true;
private boolean updateContentLength = false;
/**
* Construct a new {@code JacksonJsonView}, setting the content type to {@code application/json}.
@@ -201,6 +204,16 @@ public class MappingJacksonJsonView extends AbstractView {
this.disableCaching = disableCaching;
}
/**
* Whether to update the 'Content-Length' header of the response. When set to
* {@code true}, the response is buffered in order to determine the content
* length and set the 'Content-Length' header of the response.
* <p>The default setting is {@code false}.
*/
public void setUpdateContentLength(boolean updateContentLength) {
this.updateContentLength = updateContentLength;
}
@Override
protected void prepareResponse(HttpServletRequest request, HttpServletResponse response) {
@@ -217,9 +230,10 @@ public class MappingJacksonJsonView extends AbstractView {
protected void renderMergedOutputModel(Map<String, Object> model, HttpServletRequest request,
HttpServletResponse response) throws Exception {
OutputStream stream = this.updateContentLength ? createTemporaryOutputStream() : response.getOutputStream();
Object value = filterModel(model);
JsonGenerator generator =
this.objectMapper.getJsonFactory().createJsonGenerator(response.getOutputStream(), this.encoding);
JsonGenerator generator = this.objectMapper.getJsonFactory().createJsonGenerator(stream, this.encoding);
// A workaround for JsonGenerators not applying serialization features
// https://github.com/FasterXML/jackson-databind/issues/12
@@ -231,6 +245,10 @@ public class MappingJacksonJsonView extends AbstractView {
generator.writeRaw("{} && ");
}
this.objectMapper.writeValue(generator, value);
if (this.updateContentLength) {
writeToResponse(response, (ByteArrayOutputStream) stream);
}
}
/**