Spring4.2+整合FastJson

Spring4.2+整合FastJson

前几天升级Spring附带把原先使用jackson替换为速度比较快一点的fastjson，fastjson在处理大数据量的时候相对是要快一点。这个网上很多测评我就不多说了。
回归正传，当决定升级spring的时候，就把spring升级到了4.2.8然后问题来了。整合不了fastjson，配置了直接不顶用，这特么就尴尬了。拍胸脯保证的事情，苦逼的整吧。网上资源也比较少。就自己用maven整了源码。

Spring4.2+相配的fastjson

在看原来的4.2-的源码，![这里写图片描述](https://img-blog.csdn.net/20161128211917854)

FastJsonHttpMessageConverter发现这个类。这个类主要作用是转换器；它是4.2-的写法。发现了一个问题那就是注释：

/**
 * Fastjson for Spring MVC Converter.
 * <p>
 * Compatible Spring MVC version 4.2- (Below 4.2)
 *
 * @author VictorZeng
 * @see AbstractHttpMessageConverter
 * @see GenericHttpMessageConverter
 * @since 1.2.10
 */

看到没有Compatible Spring MVC version 4.2- (Below 4.2)试用4.2以下版本。好像不是思想的问题。应该是没问题。在看下面有一个FastJsonHttpMessageConverter4类。点进去

/**
 * Fastjson for Spring MVC Converter.
 * <p>
 * Compatible Spring MVC version 4.2+
 *
 * @author Victor.Zxy
 * @see AbstractGenericHttpMessageConverter
 * @since 1.2.11
 */

Compatible Spring MVC version 4.2+找到了，那么我们应该是用这个类。在对比一下这两个类有什么区别。

FastJsonHttpMessageConverter

public class FastJsonHttpMessageConverter //
        extends AbstractHttpMessageConverter<Object> //
        implements GenericHttpMessageConverter<Object> {
   
    
    

    @Deprecated
    protected Charset charset = IOUtils.UTF8;

    @Deprecated
    protected SerializerFeature[] features = new SerializerFeature[0];

    @Deprecated
    protected SerializeFilter[] filters = new SerializeFilter[0];

    @Deprecated
    protected String dateFormat;

    /**
     * with fastJson config
     */
    private FastJsonConfig fastJsonConfig = new FastJsonConfig();

    /**
     * @return the fastJsonConfig.
     * @since 1.2.11
     */
    public FastJsonConfig getFastJsonConfig() {
        return fastJsonConfig;
    }

    /**
     * @param fastJsonConfig the fastJsonConfig to set.
     * @since 1.2.11
     */
    public void setFastJsonConfig(FastJsonConfig fastJsonConfig) {
        this.fastJsonConfig = fastJsonConfig;
    }

    /**
     * Can serialize/deserialize all types.
     */
    public FastJsonHttpMessageConverter() {

        super(MediaType.ALL);
    }

    @Deprecated
    public Charset getCharset() {
        return this.fastJsonConfig.getCharset();
    }

    @Deprecated
    public void setCharset(Charset charset) {
        this.fastJsonConfig.setCharset(charset);
    }

    @Deprecated
    public String getDateFormat() {
        return this.fastJsonConfig.getDateFormat();
    }

    @Deprecated
    public void setDateFormat(String dateFormat) {
        this.fastJsonConfig.setDateFormat(dateFormat);
    }

    @Deprecated
    public SerializerFeature[] getFeatures() {
        return this.fastJsonConfig.getSerializerFeatures();
    }

    @Deprecated
    public void setFeatures(SerializerFeature... features) {
        this.fastJsonConfig.setSerializerFeatures(features);
    }

    @Deprecated
    public SerializeFilter[] getFilters() {
        return this.fastJsonConfig.getSerializeFilters();
    }

    @Deprecated
    public void setFilters(SerializeFilter... filters) {
        this.fastJsonConfig.setSerializeFilters(filters);
    }

    @Deprecated
    public void addSerializeFilter(SerializeFilter filter) {
        if (filter == null) {
            return;
        }

        int length = this.fastJsonConfig.getSerializeFilters().length;
        SerializeFilter[] filters = new SerializeFilter[length + 1];
        System.arraycopy(this.fastJsonConfig.getSerializeFilters(), 0, filters, 0, length);
        filters[filters.length - 1] = filter;
        this.fastJsonConfig.setSerializeFilters(filters);
    }