fastjson的值过滤器ValueFilter

项目中需要将前端传进的json数据清空值前后空格

两种实现方法

1.土方法 迭代trim()

RequestContext context = RequestContext.getCurrentContext();
InputStream in = (InputStream) context.get("requestEntity");
String body = StreamUtils.copyToString(in, Charset.forName("UTF-8"));
JSONObject object = JSON.parseObject(body);
if (object == null) object = new JSONObject();
jsonParameterTrimObject(object);

/**
     * 清空JSONObject 值前后空格
     * @param object
     */
    private void jsonParameterTrimObject(JSONObject object){
        for(String str: object.keySet()){
            Object o = object.get(str);
            if(null != o){
                if(o instanceof String){ //值为字符串类型
                    object.put(str,((String) o).trim()); //清空值前后空格
                }
                if(o instanceof JSONObject){ //值为JSON对象
                    jsonParameterTrimObject((JSONObject)o);
                }
                if(o instanceof JSONArray) { //值为JSON数组
                    jsonParameterTrimArray((JSONArray)o);
                }
            }
        }
    }

    /**
     * 清空JSONArray 值前后空格
     * @param array
     */
    private void jsonParameterTrimArray(JSONArray array){
        if(array.size() > 0){
            for(int i=0; i< array.size();i++){
                Object oa = array.get(i);
                if(null != oa){
                    if(oa instanceof String){ //值为字符串类型
                        array.set(i,((String) oa).trim()); //清空值前后空格
                    }
                    if(oa instanceof JSONObject){ //值为JSON对象
                        jsonParameterTrimObject((JSONObject)oa);
                    }
                    if(oa instanceof JSONArray) { //值为JSON数组
                        jsonParameterTrimArray((JSONArray)oa);
                    }
                }
            }
        }
    }

2.使用fastJson 值过滤器

package cango.scf.com.filter;

import com.alibaba.fastjson.serializer.ValueFilter;

public class SimpleValueFilter implements ValueFilter {
    @Override
    public Object process(Object object, String name, Object value) {
        if (value instanceof String) {
            value = ((String) value).trim();
        }
        return value;
    }
}

RequestContext context = RequestContext.getCurrentContext();
InputStream in = (InputStream) context.get("requestEntity");
if (in == null) {
   in = context.getRequest().getInputStream();
}
String body = StreamUtils.copyToString(in, Charset.forName("UTF-8"));
JSONObject object = JSON.parseObject(body);
if (object == null) object = new JSONObject();

body = JSON.toJSONString(object, new SimpleValueFilter());