Spring MVC整合fastjson

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接到任务，需要springmvc整合fastjson，原因嘛，当然是为了快。

百度到的资料不全面，因此，自己总结一下，不妥的地方请大家指正。

1，首先引入fastjson的jar包

pom.xml

<dependency><groupId>com.alibaba</groupId><artifactId>fastjson</artifactId><version>1.2.8</version></dependency>

2，在springmvc的配置中启用fastjson

 <mvc:annotation-driven>    <mvc:message-converters register-defaults="true" >        <bean class="com.oversea.frame.MappingFastJsonHttpMessageConverter">            <property name="supportedMediaTypes">                   <list>                       <value>text/html;charset=UTF-8</value>                       <value>application/json</value>                   </list>             </property>            <property name="serializerFeature">                <array>                    <value>WriteMapNullValue</value>                    <value>QuoteFieldNames</value>                </array>            </property>        </bean>    </mvc:message-converters></mvc:annotation-driven>

对于这个，网上有另一种写法

<mvc:annotation-driven>          <mvc:message-converters register-defaults="true">              <bean class="com.oversea.frame.MappingFastJsonHttpMessageConverter">                  <property name="supportedMediaTypes" value="application/json"/>              </bean>          </mvc:message-converters>  </mvc:annotation-driven>

貌似两种方法用的人都有，但是有些前台的框架一定要html哪个，第一种是不会错的

3.添加MappingFastJsonHttpMessageConverter类。这个百度的教程里没说，我也是错了之后才发现的。

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();    }}

4.配置现在就完了，接着就可以用了，用的时时候需要在用的函数上加上注解

@ResponseBody，这个表示用我们配置好的东西返回json，接着，就可以直接return 对象啦

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