SPR-5823 - JSON HttpMessageConverter

org.springframework.web/src/main/java/org/springframework/http/converter/json/JacksonHttpMessageConverter.java

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+/*
+ * Copyright 2002-2009 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.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.http.converter.json;
+
+import java.io.IOException;
+import java.nio.charset.Charset;
+
+import org.codehaus.jackson.JsonEncoding;
+import org.codehaus.jackson.JsonFactory;
+import org.codehaus.jackson.JsonGenerator;
+import org.codehaus.jackson.map.MappingJsonFactory;
+import org.codehaus.jackson.map.ObjectMapper;
+
+import org.springframework.http.HttpInputMessage;
+import org.springframework.http.HttpOutputMessage;
+import org.springframework.http.MediaType;
+import org.springframework.http.converter.AbstractHttpMessageConverter;
+import org.springframework.http.converter.HttpMessageNotReadableException;
+import org.springframework.http.converter.HttpMessageNotWritableException;
+import org.springframework.util.Assert;
+
+/**
+ * @author Arjen Poutsma
+ * @since 3.0
+ */
+public class JacksonHttpMessageConverter<T> extends AbstractHttpMessageConverter<T> {
+
+	private ObjectMapper objectMapper = new ObjectMapper();
+
+	private JsonFactory jsonFactory = new MappingJsonFactory();
+
+	private JsonEncoding encoding = JsonEncoding.UTF8;
+
+	public JacksonHttpMessageConverter() {
+		super(new MediaType("application", "json"));
+	}
+
+	public void setObjectMapper(ObjectMapper objectMapper) {
+		Assert.notNull(objectMapper, "'objectMapper' must not be null");
+		this.objectMapper = objectMapper;
+	}
+
+	public void setJsonFactory(JsonFactory jsonFactory) {
+		Assert.notNull(jsonFactory, "'jsonFactory' must not be null");
+		this.jsonFactory = jsonFactory;
+	}
+
+	public void setEncoding(JsonEncoding encoding) {
+		this.encoding = encoding;
+	}
+
+	public boolean supports(Class<? extends T> clazz) {
+		return objectMapper.canSerialize(clazz);
+	}
+
+	@Override
+	protected T readInternal(Class<T> clazz, HttpInputMessage inputMessage)
+			throws IOException, HttpMessageNotReadableException {
+		return objectMapper.readValue(inputMessage.getBody(), clazz);
+	}
+
+	@Override
+	protected MediaType getContentType(T t) {
+		Charset charset = Charset.forName(encoding.getJavaName());
+		return new MediaType("application", "json", charset);
+	}
+
+	@Override
+	protected void writeInternal(T t, HttpOutputMessage outputMessage)
+			throws IOException, HttpMessageNotWritableException {
+		JsonGenerator jsonGenerator = jsonFactory.createJsonGenerator(outputMessage.getBody(), encoding);
+		objectMapper.writeValue(jsonGenerator, t);
+	}
+}

org.springframework.web/src/main/java/org/springframework/http/converter/json/package-info.java

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+/*
+ * Copyright 2002-2009 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.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ *
+ * Provides a HttpMessageConverter implementations for handling JSON.
+ *
+ */
+package org.springframework.http.converter.json;
+

org.springframework.web/src/test/java/org/springframework/http/converter/json/JacksonHttpMessageConverterTest.java

@@ -0,0 +1,141 @@
+/*
+ * Copyright 2002-2009 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.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.http.converter.json;
+
+import java.io.IOException;
+import java.nio.charset.Charset;
+
+import static org.junit.Assert.*;
+import org.junit.Before;
+import org.junit.Test;
+
+import org.springframework.http.MediaType;
+import org.springframework.http.MockHttpInputMessage;
+import org.springframework.http.MockHttpOutputMessage;
+
+/** @author Arjen Poutsma */
+public class JacksonHttpMessageConverterTest {
+
+	private JacksonHttpMessageConverter<MyBean> converter;
+
+	@Before
+	public void setUp() {
+		converter = new JacksonHttpMessageConverter<MyBean>();
+	}
+
+	@Test
+	public void read() throws IOException {
+		String body =
+				"{\"bytes\":\"AQI=\",\"array\":[\"Foo\",\"Bar\"],\"number\":42,\"string\":\"Foo\",\"bool\":true,\"fraction\":42.0}";
+		MockHttpInputMessage inputMessage = new MockHttpInputMessage(body.getBytes("UTF-8"));
+		inputMessage.getHeaders().setContentType(new MediaType("application", "json"));
+		MyBean result = converter.read(MyBean.class, inputMessage);
+		assertEquals("Foo", result.getString());
+		assertEquals(42, result.getNumber());
+		assertEquals(42F, result.getFraction(), 0F);
+		assertArrayEquals(new String[]{"Foo", "Bar"}, result.getArray());
+		assertTrue(result.isBool());
+		assertArrayEquals(new byte[]{0x1, 0x2}, result.getBytes());
+	}
+
+	@Test
+	public void write() throws IOException {
+		MockHttpOutputMessage outputMessage = new MockHttpOutputMessage();
+		MyBean body = new MyBean();
+		body.setString("Foo");
+		body.setNumber(42);
+		body.setFraction(42F);
+		body.setArray(new String[]{"Foo", "Bar"});
+		body.setBool(true);
+		body.setBytes(new byte[]{0x1, 0x2});
+		converter.write(body, outputMessage);
+		Charset utf8 = Charset.forName("UTF-8");
+		String result = outputMessage.getBodyAsString(utf8);
+		assertTrue(result.contains("\"string\":\"Foo\""));
+		assertTrue(result.contains("\"number\":42"));
+		assertTrue(result.contains("fraction\":42.0"));
+		assertTrue(result.contains("\"array\":[\"Foo\",\"Bar\"]"));
+		assertTrue(result.contains("\"bool\":true"));
+		assertTrue(result.contains("\"bytes\":\"AQI=\""));
+		assertEquals("Invalid content-type", new MediaType("application", "json", utf8),
+				outputMessage.getHeaders().getContentType());
+	}
+
+	public static class MyBean {
+
+		private String string;
+
+		private int number;
+
+		private float fraction;
+
+		private String[] array;
+
+		private boolean bool;
+
+		private byte[] bytes;
+
+		public byte[] getBytes() {
+			return bytes;
+		}
+
+		public void setBytes(byte[] bytes) {
+			this.bytes = bytes;
+		}
+
+		public boolean isBool() {
+			return bool;
+		}
+
+		public void setBool(boolean bool) {
+			this.bool = bool;
+		}
+
+		public String getString() {
+			return string;
+		}
+
+		public void setString(String string) {
+			this.string = string;
+		}
+
+		public int getNumber() {
+			return number;
+		}
+
+		public void setNumber(int number) {
+			this.number = number;
+		}
+
+		public float getFraction() {
+			return fraction;
+		}
+
+		public void setFraction(float fraction) {
+			this.fraction = fraction;
+		}
+
+		public String[] getArray() {
+			return array;
+		}
+
+		public void setArray(String[] array) {
+			this.array = array;
+		}
+	}
+
+}