Java判断Json中的数据是否相同

背景

在开发中有时候会遇到两个 Json 对象要比对内容是否一致的问题，比如如下两个 JSON，只是部分顺序打乱

{
    "code": "19N3L08",
    "code1": "3110100252",
    "code2": "TX3110-014-160097",
    "code3": "3100",
    "code4": "3110",
    "code5": "LEHY-MRL-II",
    "msgList": [
        {
            "message": "B32053A20",
            "message1": "TSXB3200",
            "message2": "B320"
        },
        {
            "message": "B33053A20",
            "message1": "TSXB3300",
            "message2": "B330"
        }
    ]
}

{
    "code4": "3110",
    "code2": "TX3110-014-160097",
    "code1": "3110100252",
    "code": "19N3L08",
    "code3": "3100",
    "code5": "LEHY-MRL-II",
    "msgList": [
        {
            "message": "B33053A20",
            "message1": "TSXB3300",
            "message2": "B330"
        },
        {
            "message": "B33053A20",
            "message1": "TSXB3300",
            "message2": "B330"
        }
    ]
}

主要思路

1. 使用反射获取到 Result.class 的所有 get 方法，循环遍历比对两个对象，如果对象的内容相等则返回 true

    private boolean checkEleInfoEqual2(Result strJson, Result tarJson) {
        boolean result = true;
        try {for (Field field : Result.class.getDeclaredFields()) {String name = field.getName();
                Method m = Result.class.getMethod("get" + upperCase1th(name));
                if ((m.invoke(strJson) instanceof String) && !strEquals((String) m.invoke(strJson), (String) m.invoke(tarJson))) {result = false;}
            }
            result = result && listEquals(strJson.getMsgList(), tarJson.getMsgList());
        } catch (Exception e) {
            result = false;
            e.printStackTrace();}
        System.out.println(result);
        return result;
    }

2. 重写 Result.class 和 Msg.class 中的 equals 方法，如果对象的内容相等，则返回 true

重写了 equals 方法后，可以直接将两个 Result 对象使用 equals 方法进行判断对象的内容相等，对于对象中的 List 结构则可以使用 List 的 contains 方法判断对象是否在 List 中，原理是在 contains 方法在 ArrayList 中通过 indexOf 比对数据，indexOf 中遍历数组使用重写过的 equals 方法判断。

    public boolean contains(Object o) {return indexOf(o) >= 0;
    }
    
    public int indexOf(Object o) {if (o == null) {for (int i = 0; i < size; i++)
                if (elementData[i]==null)
                    return i;
        } else {for (int i = 0; i < size; i++)
                if (o.equals(elementData[i]))
                    return i;
        }
        return -1;
    }    

BeanEqual

package com.example.json;

import com.alibaba.fastjson.JSONObject;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.List;

/**
 * @Description:
 * @author: wei.wang
 * @since: 2019/11/13 15:36
 * @history: 1.2019/11/13 created by wei.wang
 */
public class BeanEqual {

    private static String strJson = "{\n" +
            "\"code\": \"19N3L08\",\n" +
            "\"code1\": \"3110100252\",\n" +
            "\"code2\": \"TX3110-014-160097\",\n" +
            "\"code3\": \"3100\",\n" +
            "\"code4\": \"3110\",\n" +
            "\"code5\": \"LEHY-MRL-II\",\n" +
            "\"msgList\": [\n" +
            "{\n" +
            "\"message\": \"B32053A20\",\n" +
            "\"message1\": \"TSXB3200\",\n" +
            "\"message2\": \"B320\"\n" +
            "},\n" +
            "{\n" +
            "\"message\": \"B33053A20\",\n" +
            "\"message1\": \"TSXB3300\",\n" +
            "\"message2\": \"B330\"\n" +
            "},\n" +
            "{\n" +
            "\"message\": \"B37053A2019\",\n" +
            "\"message1\": \"TSXB37002\",\n" +
            "\"message2\": \"B370\"\n" +
            "},\n" +
            "{\n" +
            "\"message\": \"F31053A20\",\n" +
            "\"message1\": \"TSXF3100\",\n" +
            "\"message2\": \"F310\"\n" +
            "},\n" +
            "{\n" +
            "\"message\": \"F31053A20\",\n" +
            "\"message1\": \"TSXF3100\",\n" +
            "\"message2\": \"F380\"\n" +
            "},\n" +
            "{\n" +
            "\"message\": \"F31053A20\",\n" +
            "\"message1\": \"TSXF3100\",\n" +
            "\"message2\": \"F300\"\n" +
            "}\n" +
            "]\n" +
            "}";

    private static String tarJson = "{\n" +
            "\"code4\": \"3110\",\n" +
            "\"code2\": \"TX3110-014-160097\",\n" +
            "\"code1\": \"3110100252\",\n" +
            "\"code\": \"19N3L08\",\n" +
            "\"code3\": \"3100\",\n" +
            "\"code5\": \"LEHY-MRL-II\",\n" +
            "\"msgList\": [\n" +
            "\t    {\n" +
            "\"message\": \"B33053A20\",\n" +
            "\"message1\": \"TSXB3300\",\n" +
            "\"message2\": \"B330\"\n" +
            "},\n" +
            "{\n" +
            "\"message\": \"B37053A2019\",\n" +
            "\"message1\": \"TSXB37002\",\n" +
            "\"message2\": \"B370\"\n" +
            "},\n" +
            "{\n" +
            "\"message\": \"F31053A20\",\n" +
            "\"message1\": \"TSXF3100\",\n" +
            "\"message2\": \"F300\"\n" +
            "},\n" +
            "{\n" +
            "\"message\": \"B32053A20\",\n" +
            "\"message1\": \"TSXB3200\",\n" +
            "\"message2\": \"B320\"\n" +
            "},\n" +
            "{\n" +
            "\"message\": \"F31053A20\",\n" +
            "\"message1\": \"TSXF3100\",\n" +
            "\"message2\": \"F310\"\n" +
            "},\n" +
            "{\n" +
            "\"message\": \"F31053A20\",\n" +
            "\"message1\": \"TSXF3100\",\n" +
            "\"message2\": \"F380\"\n" +
            "}\n" +
            "]\n" +
            "}";

    public static void main(String[] args) {
        // 将获取到的 JSON 转为 Result 对象
        Result r1 = JSONObject.parseObject(strJson, Result.class);
        Result r2 = JSONObject.parseObject(tarJson, Result.class);

        System.out.println(strJson);
        System.out.println(tarJson);
        BeanEqual test = new BeanEqual();
        test.checkEleInfoEqual2(r1, r2);
    }

    public static boolean listEquals(List<Msg> l1, List<Msg> l2) {
        boolean result = true;
        if (l1.size() != l2.size()) {
            result = false;
            System.out.println("行数据量不一致");
        }
        for (Msg msg : l1) {if (!l2.contains(msg)) {
                result = false;
                System.out.println(msg.getMessage() + "数据不一致");
            } else {l2.remove(msg);
            }
        }
        if (l2.size() > 0) {result = false;}
        return result;
    }

    /**
     * 重写 equals 方法
     *
     * @param strJson
     * @param tarJson
     */
    private void checkEleInfoEqual(Result strJson, Result tarJson) {System.out.println(strJson.equals(tarJson));
    }

    /**
     * 反射获取值
     *
     * @param strJson
     * @param tarJson
     */
    private boolean checkEleInfoEqual2(Result strJson, Result tarJson) {
        boolean result = true;
        try {for (Field field : Result.class.getDeclaredFields()) {String name = field.getName();
                Method m = Result.class.getMethod("get" + upperCase1th(name));
                if ((m.invoke(strJson) instanceof String) && !strEquals((String) m.invoke(strJson), (String) m.invoke(tarJson))) {result = false;}
            }
            result = result && listEquals(strJson.getMsgList(), tarJson.getMsgList());
        } catch (Exception e) {
            result = false;
            e.printStackTrace();}
        System.out.println(result);
        return result;
    }

    /**
     * 首字符大写
     *
     * @param str
     * @return
     */
    public static String upperCase1th(String str) {return str.substring(0, 1).toUpperCase() + str.substring(1);
    }

    /**
     * 字符串相等
     *
     * @param str
     * @param tar
     * @return
     */
    public static boolean strEquals(String str, String tar) {
        // 都为空，或者都不为空且相等，数字判断
        if (isStrEmpty(str) && isStrEmpty(tar) || (!isStrEmpty(str) && !isStrEmpty(tar) && (str.equals(tar) || numberEqual(str, tar)))) {return true;}
        return false;
    }


    /**
     * 字符是否为空
     *
     * @param str
     * @return
     */
    public static boolean isStrEmpty(String str) {return str == null || str.trim().length() == 0;}

    /**
     * 校验数字相等   2.0 2.00    2
     *
     * @param str
     * @param tar
     * @return
     */
    public static boolean numberEqual(String str, String tar) {
        try {double strNum = Double.valueOf(str);
            double tarNum = Double.valueOf(tar);
            return strNum == tarNum;
        } catch (Exception e) {
            // 如果抛出异常，返回 False
            return false;
        }
    }

}

Msg

package com.example.json;

/**
 * @Description:
 * @author: wei.wang
 * @since: 2019/11/13 15:33
 * @history: 1.2019/11/13 created by wei.wang
 */
public class Msg {
    private String message;
    private String message1;
    private String message2;

    public String getMessage() {return message;}

    public void setMessage(String message) {this.message = message;}

    public String getMessage1() {return message1;}

    public void setMessage1(String message1) {this.message1 = message1;}

    public String getMessage2() {return message2;}

    public void setMessage2(String message2) {this.message2 = message2;}

    @Override
    public boolean equals(Object obj) {return BeanEqual.strEquals(message, ((Msg) obj).getMessage()) &&
                BeanEqual.strEquals(message1, ((Msg) obj).getMessage1()) &&
                BeanEqual.strEquals(message2, ((Msg) obj).getMessage2());
    }
}

Result

package com.example.json;

import java.util.List;

/**
 * @Description:
 * @author: wei.wang
 * @since: 2019/11/13 15:33
 * @history: 1.2019/11/13 created by wei.wang
 */
public class Result {
    private String code;
    private String code1;
    private String code2;
    private String code3;
    private String code4;
    private String code5;

    private List<Msg> msgList;

    public String getCode() {return code;}

    public void setCode(String code) {this.code = code;}

    public String getCode1() {return code1;}

    public void setCode1(String code1) {this.code1 = code1;}

    public String getCode2() {return code2;}

    public void setCode2(String code2) {this.code2 = code2;}

    public String getCode3() {return code3;}

    public void setCode3(String code3) {this.code3 = code3;}

    public String getCode4() {return code4;}

    public void setCode4(String code4) {this.code4 = code4;}

    public String getCode5() {return code5;}

    public void setCode5(String code5) {this.code5 = code5;}

    public List<Msg> getMsgList() {return msgList;}

    public void setMsgList(List<Msg> msgList) {this.msgList = msgList;}
    
    // 重写 Result 的 equals 方法，如果内容相等则返回 true
    @Override
    public boolean equals(Object obj) {return BeanEqual.strEquals(code, ((Result) obj).getCode()) &&
                BeanEqual.strEquals(code1, ((Result) obj).getCode1()) &&
                BeanEqual.strEquals(code2, ((Result) obj).getCode2()) &&
                BeanEqual.strEquals(code3, ((Result) obj).getCode3()) &&
                BeanEqual.strEquals(code4, ((Result) obj).getCode4()) &&
                BeanEqual.strEquals(code5, ((Result) obj).getCode5()) &&
                BeanEqual.listEquals(msgList, ((Result) obj).getMsgList());
    }
}