自定义配置化解析定长报文（JAVA）

通过固定实体类解析的参考我上一篇转载文章，在此基础上我修改为配置化解析报文。

原作者：

https://blog.youkuaiyun.com/weixin_33851604/article/details/88241284

 

关于jar包：hutool，fastjson，其他工具类报错可以自行解决。

实体类

MsgConfig ：

package com.ins.common.msg.entity;

import java.util.LinkedList;

/**
 * MsgConfig.java 报文配置实体类
 * 
 * @author skysource
 * @date 2019-06-03 11:56:07
 * @since 1.0
 */
public class MsgConfig {
    /**
     * 消息类型
     */
    String msgType;
    /**
     * 消息规则配置,可改为抽象方法来实现多个不同的规则
     */
    LinkedList<MsgConfigInfo> msgConfigInfos;

    /**
     * @return the msgType
     */
    public String getMsgType() {
        return msgType;
    }

    /**
     * @param msgType
     *            the msgType to set
     */
    public void setMsgType(String msgType) {
        this.msgType = msgType;
    }

    /**
     * @return the msgConfigInfos
     */
    public LinkedList<MsgConfigInfo> getMsgConfigInfos() {
        return msgConfigInfos;
    }

    /**
     * @param msgConfigInfos
     *            the msgConfigInfos to set
     */
    public void setMsgConfigInfos(LinkedList<MsgConfigInfo> msgConfigInfos) {
        this.msgConfigInfos = msgConfigInfos;
    }

}

MsgConfigInfo：

package com.ins.common.msg.entity;

import java.util.LinkedList;

/**
 * MsgConfigInfo.java 报文规则配置
 * 
 * @author skysource
 * @date 2019-06-03 11:57:44
 * @since 1.0
 */
public class MsgConfigInfo {
    /**
     * 定长消息主体名称，如Head、Body等
     */
    private String msgName;
    
    /**
     * msgName值对应的字段，如key:value
     */
    private String msgField;

    /**
     * 循环字段，如值为"occurrenceCount"，则表示需要根据报文字段occurrenceCount的值，循环当前报文体下面所有的值。如果occurrenceCount的值为5，则表示有5次循环
     */
    private String cycleField;

    /**
     * 固定循环次数，如，50 表示循环50次，不足50次使用占位符表示
     */
    private int fixedCycleCount;

    /**
     * 字段类型，0字符串，1Map对象，2List集合，4整数，5浮点数字
     */
    private String fieldType;
    
    /**
     * 定长消息规则集合
     */
    private LinkedList<MsgField> msgConfigs;

    /**
     * @return the msgName
     */
    public String getMsgName() {
        return msgName;
    }

    /**
     * @param msgName
     *            the msgName to set
     */
    public void setMsgName(String msgName) {
        this.msgName = msgName;
    }
    
    /**
     * @return the msgField
     */
    public String getMsgField() {
        return msgField;
    }

    /**
     * @param msgField the msgField to set
     */
    public void setMsgField(String msgField) {
        this.msgField = msgField;
    }

    /**
     * @return the msgConfigs
     */
    public LinkedList<MsgField> getMsgConfigs() {
        return msgConfigs;
    }

    /**
     * @return the cycleField
     */
    public String getCycleField() {
        return cycleField;
    }


    /**
     * @return the fixedCycleCount
     */
    public int getFixedCycleCount() {
        return fixedCycleCount;
    }

    /**
     * @param fixedCycleCount
     *            the fixedCycleCount to set
     */
    public void setFixedCycleCount(int fixedCycleCount) {
        this.fixedCycleCount = fixedCycleCount;
    }

    /**
     * @return the fieldType
     */
    public String getFieldType() {
        return fieldType;
    }

    /**
     * @param fieldType
     *            the fieldType to set
     */
    public void setFieldType(String fieldType) {
        this.fieldType = fieldType;
    }

    /**
     * @param cycleField
     *            the cycleField to set
     */
    public void setCycleField(String cycleField) {
        this.cycleField = cycleField;
    }

    /**
     * @param msgConfigs
     *            the msgConfigs to set
     */
    public void setMsgConfigs(LinkedList<MsgField> msgConfigs) {
        this.msgConfigs = msgConfigs;
    }
}

MsgField：

/**
 * package-info.java
 * 
 * @author skysource
 * @date 2019-05-30 14:24:14
 * @since 1.0
 */
package com.ins.common.msg.entity;

/**
 * 消息域 MsgField.java
 * 
 * @author skysource
 * @date 2019-06-04 11:12:49
 * @since 1.0
 */
public class MsgField {

    public MsgField(String name, int length, char fillChar, FillSide fillSide) {
        this.name = name;
        this.length = length;
        this.fillChar = fillChar;
        this.fillSide = fillSide;
    }

    public MsgField(String name, int length, char fillChar, FillSide fillSide,String fieldType) {
        this.name = name;
        this.length = length;
        this.fillChar = fillChar;
        this.fillSide = fillSide;
        this.fieldType = fieldType;
    }

    /**
     * 填充位置
     * 
     * @author Zhenwei.Zhang (2013-9-25)
     */
    public enum FillSide {
        LEFT, RIGHT
    }
     
    /** 
     * 字段名称
     */
    private String name;
    
    /** 
     * 长度 
     */
    private int length;
    
    /**
     * 填充字符
     */
    private char fillChar;
    
    /**
     * 填充位置
     */
    private FillSide fillSide;
    
    /**
     * 字段类型，0字符串，1Map对象，2List集合，4整数，5浮点数字
     */
    private String fieldType;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getLength() {
        return length;
    }

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

    public char getFillChar() {
        return fillChar;
    }

    public void setFillChar(char fillChar) {
        this.fillChar = fillChar;
    }

    public FillSide getFillSide() {
        return fillSide;
    }

    public void setFillSide(FillSide fillSide) {
        this.fillSide = fillSide;
    }

    public String getFieldType() {
        return fieldType;
    }

    public void setFieldType(String fieldType) {
        this.fieldType = fieldType;
    }
}

主程序类

MsgPackage：

package com.ins.common.msg.mainPackage;

/**
 * MsgPackage.java
 * 
 * @author skysource
 * @date 2019-05-30 14:26:44
 * @since 1.0
 */
import java.beans.PropertyDescriptor;
import java.lang.reflect.Method;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.LinkedList;
import java.util.Map;
import java.util.Map.Entry;

import com.ins.common.msg.entity.MsgConfig;
import com.ins.common.msg.entity.MsgConfigInfo;
import com.ins.common.msg.entity.MsgField;

import cn.hutool.core.util.ArrayUtil;
import cn.hutool.json.JSONUtil;

/**
 * 消息包，由多个消息片组成
 * 
 */
public abstract class MsgPackage {

    /** 消息包的消息片数组 */
    String[] pieces = null;
    
    LinkedHashMap<String, MsgConfigInfo> msgConfigMap = new LinkedHashMap<>();

    public MsgPackage(String... pieName) {
        pieces = pieName;
    }

    public MsgPackage(LinkedList<MsgConfigInfo> msgConfigInfoList) {
        msgConfigInfoList.stream().forEach(t -> msgConfigMap.put(t.getMsgName(), t));
    }


    /**
     * 组包
     * 
     * @param charsetName
     * @return
     * @throws Exception
     */
    public byte[] pack(String charsetName) throws Exception {
        int index = 0;
        byte[] result = new byte[this.getLength()];
        for (String p : pieces) {
            PropertyDescriptor pd = new PropertyDescriptor(p, this.getClass());
            Method getterMethod = pd.getReadMethod();
            MsgPiece piece = (MsgPiece) getterMethod.invoke(this);
            if (piece == null) { // 属性为空则该属性组空串
                piece = (MsgPiece) pd.getPropertyType().newInstance();
            }
            byte[] t = piece.pack(charsetName);
            System.arraycopy(t, 0, result, index, t.length);
            index += t.length;
        }
        return result;
    }

    /**
     * 解包
     * 
     * @param msg
     * @param charsetName
     * @throws Exception
     */
    public void unPack(byte[] msg, String charsetName) throws Exception {
        if (msg.length != this.getLength()) {
            throw new Exception("解消息出错，消息包长度不合法！");
        }

        int index = 0;
        for (String p : pieces) { // 创建一个新的属性对象，解包，赋值
            PropertyDescriptor pd = new PropertyDescriptor(p, this.getClass());
            Method writeMethod = pd.getWriteMethod();
            MsgPiece piece = (MsgPiece) pd.getPropertyType().newInstance();
            byte[] t = new byte[piece.getLength()];
            System.arraycopy(msg, index, t, 0, t.length);
            piece.unPack(t, charsetName);
            writeMethod.invoke(this, piece);
            index += t.length;
        }
    }

    /**
     * 解包