SpringMVC杂记(1) 使用阿里巴巴的fastjson

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1) 国产开源软件要支持的

<dependency>    <groupId>com.alibaba</groupId>    <artifactId>fastjson</artifactId>    <version>1.2.1</version></dependency>

2) spring没有提供相应的HttpMessageConverter可以自己写一个。

package com.alibaba.fastjson.spring.support;import java.io.ByteArrayOutputStream;import java.io.IOException;import java.io.OutputStream;import java.nio.charset.Charset;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 com.alibaba.fastjson.JSON;import com.alibaba.fastjson.serializer.SerializerFeature;public class MappingFastJsonHttpMessageConverter extends AbstractHttpMessageConverter<Object> {    public static final Charset DEFAULT_CHARSET = Charset.forName("UTF-8");        // fastjson特性参数    private SerializerFeature[] serializerFeature;    public SerializerFeature[] getSerializerFeature() {        return serializerFeature;    }    public void setSerializerFeature(SerializerFeature[] serializerFeature) {        this.serializerFeature = serializerFeature;    }    public MappingFastJsonHttpMessageConverter() {        super(new MediaType("application", "json", DEFAULT_CHARSET));    }    @Override    public boolean canRead(Class<?> clazz, MediaType mediaType) {        // JavaType javaType = getJavaType(clazz);        // return this.objectMapper.canDeserialize(javaType) &&        // canRead(mediaType);        return true;    }    @Override    public boolean canWrite(Class<?> clazz, MediaType mediaType) {        // return this.objectMapper.canSerialize(clazz) && canWrite(mediaType);        return true;    }    @Override    protected boolean supports(Class<?> clazz) {        // should not be called, since we override canRead/Write instead        throw new UnsupportedOperationException();    }    @Override    protected Object readInternal(Class<?> clazz, HttpInputMessage inputMessage)            throws IOException, HttpMessageNotReadableException {        ByteArrayOutputStream baos = new ByteArrayOutputStream();        int i;        while ((i = inputMessage.getBody().read()) != -1) {            baos.write(i);        }        return JSON.parseArray(baos.toString(), clazz);    }    @Override    protected void writeInternal(Object o, HttpOutputMessage outputMessage)            throws IOException, HttpMessageNotWritableException {        String jsonString = JSON.toJSONString(o, serializerFeature);        OutputStream out = outputMessage.getBody();        out.write(jsonString.getBytes(DEFAULT_CHARSET));        out.flush();    }}

3) 配置

<mvc:annotation-driven>    <mvc:message-converters register-defaults="true" >        <bean class="com.alibaba.fastjson.spring.support.MappingFastJsonHttpMessageConverter">            <property name="supportedMediaTypes" value="application/json" />            <property name="serializerFeature">                <array>                    <value>WriteMapNullValue</value>                    <value>QuoteFieldNames</value>                </array>            </property>        </bean>    </mvc:message-converters></mvc:annotation-driven>

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