需求： 两个列表，一个文件路径列表，一个需要保留的接口列表，将文件路径列表中所有文件移除所有除了保留接口以外的接口。
主要有两个需要解决的问题，一是筛选出所有文件中哪些数据需要移除，二是如何移除。
问题一通过arrayList的交集（ .retainAll() ）差集（ .removeAll() ） 以及并集（ .removeAll() .addAll() ）方法，来将需要移除或者保留的接口进行筛选出来。再交付给第二步进行操作。
问题二，通过org.w3c.dom.* 以及javax.xml. 相关包下的工具进行xml的读取筛选以及操作并参考网络上的相关代码。
实现代码：
代码语言：javascript复制package xyz.diuut;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.file.Files;
import java.util.ArrayList;
import java.util.List;
import org.w3c.dom.*;
import javax.xml.parsers.*;
import javax.xml.transform.*;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.*;
import javax.xml.xpath.*;
/**
* @Author Diuut
* @Date 2020/4/2 15:32
*/
public class BizClearUtil {
/**
* 复制下面这段 另存文件r.bat 在指定文件夹中执行，获取该文件夹下所有文件路径
* DIR /S/B >bizslist.TXT
*/
public static void main(String[] args) {
List<String> urlList = getList("F:\IDEA-workspace\Test_demo\Test_user\src\main\resources\bizslist.TXT");
//上面路径放入执行r.bat后生成的文件地址列表
List<String> bizUrlList = new ArrayList<String>(); //biz 文件路径列表
assert urlList != null;
for (String temp : urlList) {
if (temp.contains(".biz")) {
bizUrlList.add(temp);
}
}
// System.out.println(bizUrlList);
List<String> apiListAndDo = getList("F:\IDEA-workspace\Test_demo\Test_user\src\main\resources\mbankApi.txt");
//上面路径放入生成好的需要保存的api
List<String> apiList = new ArrayList<String>(); //api 文件名列表 不包含do
assert apiListAndDo != null;
for (String temp : apiListAndDo) {
String replace = temp.replace(".do", "");
apiList.add(replace);
}
// System.out.println(apiList);
for (String bizUrl : bizUrlList) { //遍历调用清除不需要保存的api
clearBizApi(bizUrl, apiList);
clearEmptyBiz(bizUrl);
}
}
/**
* 删除空的Biz文件
*
* @param bizUrl birUrl路径
*/
public static void clearEmptyBiz(String bizUrl) {
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
Element theBook = null, root = null;
try {
factory.setIgnoringElementContentWhitespace(true);
DocumentBuilder db = factory.newDocumentBuilder();
Document xmldoc = (Document) db.parse(new File(bizUrl));
root = xmldoc.getDocumentElement();
xmldoc.setXmlStandalone(true);
//打印查找的节点
NodeList nodeList = selectNodes("/MCITransaction/operation", root);
List<String> currentIds = new ArrayList<>();
for (int i = 0; i < nodeList.getLength(); i ) {
String id = nodeList.item(i).getAttributes().getNamedItem("id").toString();
String substring = id.substring(4, id.length() - 1);
currentIds.add(substring);
}
if (currentIds.size() == 0) {
System.out.println("当前biz文件中不不包含需要保留的operation，故删除该文件：" bizUrl);
File file = new File(bizUrl);
file.delete();
}
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 清除除指定api外的其他operation
*
* @param bizUrl birUrl路径
* @param saveApiList 需要保存的api列表
*/
public static void clearBizApi(String bizUrl, List<String> saveApiList) {
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
Element theBook = null, root = null;
try {
factory.setIgnoringElementContentWhitespace(true);
DocumentBuilder db = factory.newDocumentBuilder();
Document xmldoc = (Document) db.parse(new File(bizUrl));
root = xmldoc.getDocumentElement();
xmldoc.setXmlStandalone(true);
//打印查找的节点
NodeList nodeList = selectNodes("/MCITransaction/operation", root);
List<String> currentIds = new ArrayList<>();
for (int i = 0; i < nodeList.getLength(); i ) {
String id = nodeList.item(i).getAttributes().getNamedItem("id").toString();
String substring = id.substring(4, id.length() - 1);
currentIds.add(substring);
}
System.out.println(bizUrl " 中所有的 operationId：n" currentIds);
List<String> allApi = new ArrayList<>(currentIds);
boolean flag1 = currentIds.retainAll(saveApiList); //当前api列表与保留api列表的交集，即存在的api存在于该list中
System.out.println("flag1:" flag1);
System.out.println(bizUrl " 中需要保存 operationId：n" currentIds);
boolean flag2 = allApi.removeAll(currentIds); //所有api的列表与保留api列表的差集，即需要移除的api列表
System.out.println("flag2:" flag2);
System.out.println(bizUrl "中需要移除的 operationId：n" allApi);
if (allApi.size() == 0) {
System.out.println(bizUrl " 中没有需要移除的 operationId");
return;
}
for (String currentId : allApi) {
theBook = (Element) selectSingleNode("/MCITransaction/operation[@id='" currentId "']", root);
// 删除节点
theBook.getParentNode().removeChild(theBook);
// output(xmldoc);
saveXml(bizUrl, xmldoc);
}
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 根据路径文件生成列表
*
* @param path 地址
* @return
*/
public static List<String> getList(String path) {
File listFile = new File(path);
List<String> urlList = new ArrayList<String>();
if (listFile.exists()) {
try {
urlList = Files.readAllLines(listFile.toPath());
} catch (IOException ex) {
ex.printStackTrace();
}
if (urlList.isEmpty()) {
System.out.println("路径文件生成为空");
return null;
}
}
return urlList;
}
/**
* 将node的XML字符串输出到控制台
*
* @param node
*/
public static void output(Node node) {
TransformerFactory transFactory = TransformerFactory.newInstance();
try {
Transformer transformer = transFactory.newTransformer();
transformer.setOutputProperty("encoding", "gb2312");
transformer.setOutputProperty("indent", "yes");
DOMSource source = new DOMSource();
source.setNode(node);
StreamResult result = new StreamResult();
result.setOutputStream(System.out);
transformer.transform(source, result);
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 查找节点，并返回第一个符合条件节点
*
* @param express
* @param source
* @return
*/
public static Node selectSingleNode(String express, Object source) {
Node result = null;
XPathFactory xpathFactory = XPathFactory.newInstance();
XPath xpath = xpathFactory.newXPath();
try {
result = (Node) xpath.evaluate(express, source, XPathConstants.NODE);
} catch (XPathExpressionException e) {
e.printStackTrace();
}
return result;
}
/**
* 查找节点，返回符合条件的节点集。
*
* @param express
* @param source
* @return
*/
public static NodeList selectNodes(String express, Object source) {
NodeList result = null;
XPathFactory xpathFactory = XPathFactory.newInstance();
XPath xpath = xpathFactory.newXPath();
try {
result = (NodeList) xpath.evaluate(express, source,
XPathConstants.NODESET);
} catch (XPathExpressionException e) {
e.printStackTrace();
}
return result;
}
/**
* 将Document输出到文件
*
* @param fileName
* @param doc
*/
public static void saveXml(String fileName, Document doc) {
TransformerFactory transFactory = TransformerFactory.newInstance();
try {
Transformer transformer = transFactory.newTransformer();
transformer.setOutputProperty("indent", "yes"); //standalone="no" 配置xml头文件属性
DOMSource source = new DOMSource();
source.setNode(doc);
StreamResult result = new StreamResult();
result.setOutputStream(new FileOutputStream(fileName));
transformer.transform(source, result);
} catch (Exception e) {
e.printStackTrace();
}
}
}参考博客 https://blog.csdn.net/u013183865/article/details/32165289
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