使用Java正则实现Loadrunner的关联函数web_save_param

工作需要，用Java实现loadrunner的web_saveparam函数，如下：

package com.xuwangcheng.demo;

/**
 * 关联参数
 * @author xuwangcheng14@163.com
 * @version 1.0.0
 * @description
 * @date 2020/7/5  21:16
 */
public class RelationParam {
    /**
     * 左边界
     */
    private String lb;
    /**
     * 右边界
     */
    private String rb;
    /**
     * 取值顺序
     */
    private Integer order = 1;
    /**
     * 偏移量
     */
    private Integer offset = 0;
    /**
     * 取值长度
     */
    private Integer length;

    public String getLb() {
        return lb;
    }

    public void setLb(String lb) {
        this.lb = lb;
    }

    public String getRb() {
        return rb;
    }

    public void setRb(String rb) {
        this.rb = rb;
    }

    public Integer getOrder() {
        return order;
    }

    public void setOrder(Integer order) {
        this.order = order;
    }

    public Integer getOffset() {
        return offset;
    }

    public void setOffset(Integer offset) {
        this.offset = offset;
    }

    public Integer getLength() {
        return length;
    }

    public void setLength(Integer length) {
        this.length = length;
    }
}

package com.xuwangcheng.demo;

import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * @author xuwangcheng14@163.com
 * @version 1.0.0
 * @description
 * @date 2020/7/5  21:18
 */
public class DemoTest {
    public static void main(String[] args) {
        String str = "{\"root\":{\"name\":\"xuwangcheng\",\"age\":30}}";
        RelationParam param = new RelationParam();
        param.setLb("\"age\":");
        param.setRb("}}");

        System.out.println(getValueByRelationKeyWord(param, str));
    }

    /**
     * 关联取值
     * @param param 参数
     * @param string 取值字符串
     * @return
     */
    private static String getValueByRelationKeyWord(RelationParam param, String string) {
        if (isEmpty(string) || param == null) {
            return string;
        }

        String result = "";
        if (isEmpty(param.getLb()) && isEmpty(param.getRb())) {
            result = string;
        } else {
            // 根据左右边界取值
            String regex = param.getLb() + "(.*?)" + param.getRb();
            Pattern pattern = Pattern.compile(regex);
            List<String> regStrs = new ArrayList<String>();
            Matcher matcher = pattern.matcher(string);
            while (matcher.find()) {
                regStrs.add(matcher.group(1));
            }
            if (regStrs.size() < param.getOrder()) {
                return null;
            }

            //根据order取值
            result = regStrs.get(param.getOrder() - 1);

            //根据offset取值
            if (param.getOffset() != null && param.getOffset() < result.length()) {
                result = result.substring(param.getOffset());
            }

            // 根据length取值
            if (param.getLength() != null) {
                result = result.substring(0, param.getLength());
            }
        }

        return result;

    }

    private static boolean isEmpty (String s){
        if (s == null || s.length() == 0) {
            return true;
        }

        return false;
    }

}