JsonPath工具类封装

书接上文和上上文：

JsonPath实践（一）
JsonPath实践（二）
JsonPath实践（三）
JsonPath实践（四）
JsonPath实践（五）
JsonPath实践（六）

在经历过一些波折之后，总算是把JsonPath工具类的封装类写好了，时间仓促。没有太严格的测试，等有机会我再用Groovy进行单元测试框架spock写一些单测来验证一下。

工具类的语言Groovy，有点不必多说了，相信使用Java技术栈的同学读起来应该不会有障碍。另外我把官方的API当做类注释写出来了。

有两个关于verify类的方法，这个主要是为了验证用的，涉及到Groovy重载操作符，是专门写的一个提供给Groovy脚本的验证功能类，还有就是为开源测试服务增加功能储备。

代码如下：

package com.fun.utils

import com.alibaba.fastjson.JSONObject
import com.fun.base.exception.ParamException
import com.fun.frame.SourceCode
import com.jayway.jsonpath.JsonPath
import com.jayway.jsonpath.JsonPathException
import org.slf4j.Logger
import org.slf4j.LoggerFactory

/**下面是例子,官方文档地址:https://github.com/json-path/JsonPath/blob/master/README.md
 * $.store.book[*].author The authors of all books
 * $..author All authors
 * $.store.* All things, both books and bicycles
 * $.store..price The price of everything
 * $..book[2] The third book
 * $..book[-2] The second to last book
 * $..book[0,1] The first two books
 * $..book[:2] All books from index 0 (inclusive) until index 2 (exclusive)
 * $..book[1:2] All books from index 1 (inclusive) until index 2 (exclusive)
 * $..book[-2:] Last two books
 * $..book[2:] Book number two from tail
 * $..book[?(@.isbn)] All books with an ISBN number
 * $.store.book[?(@.price < 10)] All books in store cheaper than 10
 * $..book[?(@.price <= $['expensive'])] All books in store that are not "expensive"
 * $..book[?(@.author =~ /.*REES/i)] All books matching regex (ignore case)
 * $..* Give me every thing
 * $..book.length() The number of books
 *
 *
 * min() Provides the min value of an array of numbers Double
 * max() Provides the max value of an array of numbers Double
 * avg() Provides the average value of an array of numbers Double
 * stddev() Provides the standard deviation value of an array of numbers Double
 * length() Provides the length of an array Integer
 * sum() Provides the sum value of an array of numbers Double
 * min() 最小值 Double
 * max() 最大值 Double
 * avg() 平均值 Double
 * stddev() 标准差 Double
 * length() 数组长度 Integer
 * sum() 数组之和 Double
 * == left is equal to right (note that 1 is not equal to '1')
 * != left is not equal to right
 * < left is less than right
 * <= left is less or equal to right
 * > left is greater than right
 * >= left is greater than or equal to right
 * =~ left matches regular expression [?(@.name =~ /foo.*?/i)]
 * in left exists in right [?(@.size in ['S', 'M'])]
 * nin left does not exists in right
 * subsetof 子集 [?(@.sizes subsetof ['S', 'M', 'L'])]
 * anyof left has an intersection with right [?(@.sizes anyof ['M', 'L'])]
 * noneof left has no intersection with right [?(@.sizes noneof ['M', 'L'])]
 * size size of left (array or string) should match right
 * empty left (array or string) should be empty
 */
class JsonUtil extends SourceCode {

    private static Logger logger = LoggerFactory.getLogger(JsonUtil.class)

    /**
     * 用户构建对象,获取verify对象
     */
    private JSONObject json

    private JsonUtil(JSONObject json) {
        this.json = json
    }

    static JsonUtil getInstance(JSONObject json) {
        new JsonUtil(json)
    }

    Verify getVerify(String path) {
        Verify.getInstance(this.json, path)
    }

    /**
     * 获取string对象
     * @param path
     * @return
     */
    String getString(String path) {
        def object = get(path)
        object == null ? EMPTY : object.toString()
    }


    /**
     * 获取int类型
     * @param path
     * @return
     */
    int getInt(String path) {
        changeStringToInt(getString(path))
    }

    /**
     * 获取boolean类型
     * @param path
     * @return
     */
    int getBoolean(String path) {
        changeStringToBoolean(getString(path))
    }

    /**
     * 获取long类型
     * @param path
     * @return
     */
    int getLong(String path) {
        changeStringToLong(getString(path))
    }
    
    /**
     * 获取double类型
     * @param path
     * @return
     */
    double getDouble(String path) {
        changeStringToDouble(getString(path))
    }

    /**
     * 获取list对象
     * @param path
     * @return
     */
    List getList(String path) {
        get(path) as List
    }

    /**
     * 获取匹配对象,类型传参
     * 这里不加public  IDE会报错
     * @param path
     * @param tClass
     * @return
     */
    public <T> T getT(String path, Class<T> tClass) {
        try {
            get(path) as T
        } catch (ClassCastException e) {
            logger.warn("类型转换失败!", e)
            null
        }
    }

    /**
     * 获取匹配对象
     * @param path
     * @return
     */
    Object get(String path) {
        logger.debug("匹配对象:{},表达式:{}", json.toString(), path)
        if (json == null || json.isEmpty()) ParamException.fail("json为空或者null,参数错误!")
        try {
            JsonPath.read(this.json, path)
        } catch (JsonPathException e) {
            logger.warn("jsonpath:{}解析失败,json值", json.toString(), path, e)
            null
        }
    }


}