时间戳

首页 > 解决方案 > 尝试使用 .replace() 替换使用 XPATH java 提取的 XML 依赖项

java - 尝试使用 .replace() 替换使用 XPATH java 提取的 XML 依赖项

问题描述

我有一个 pom xml 和 pom-web xml。我试图通过使用Xpath将依赖项提取到变量中并尝试使用变量在 pom.xml 文件中执行 .replace 来将依赖项从 pom-web 复制到 pom.xml。但我无法通过变量替换内容，因为 .contains() 的 if 条件为 false。下面的任何帮助都是我使用的代码

pom.xml

<project>
    <dependencies>
        <dependency>
            <groupId>com.test.tm</groupId>
            <artifactId>gameJdk</artifactId>
            <version>1.0.0.1</version>
        </dependency>
        <!-- For Compress JS -->
        <dependency>
            <groupId>com.yahoo.platform.yui</groupId>
            <artifactId>yuicompressor</artifactId>
            <version>2.4.7</version>
        </dependency>
        <dependency>
            <groupId>com.sybase</groupId>
            <artifactId>EccpressoFIPSJca</artifactId>
            <version>7.0</version>
        </dependency>

        <dependency>
            <groupId>com.sybase</groupId>
            <artifactId>EccpressoFIPS</artifactId>
            <version>7.0</version>
        </dependency>
        <dependency>
            <groupId>xerces</groupId>
            <artifactId>xercesImpl</artifactId>
            <version>2.12.0</version>
        </dependency>
    </dependencies>
</project>

pom-web.xml

<project>
    <dependencies>
        <dependency>
            <groupId>com</groupId>
            <artifactId>passwordsdk</artifactId>
            <version>3.4.1</version>
        </dependency>
        <!-- For Compress JS -->
        <dependency>
            <groupId>com.yahoo.platform.yui</groupId>
            <artifactId>yuicompressor</artifactId>
            <version>2.4.7</version>
        </dependency>
        <dependency>
            <groupId>com.sybase</groupId>
            <artifactId>EccpressoFIPSJca</artifactId>
            <version>7.0</version>
        </dependency>

        <dependency>
            <groupId>com.data</groupId>
            <artifactId>EccpressoFIPS</artifactId>
            <version>7.0</version>
        </dependency>
        <dependency>
            <groupId>tesdt</groupId>
            <artifactId>xercesImpl</artifactId>
            <version>2.12.0</version>
        </dependency>
    </dependencies>
</project>

替换后预期的 pom.xml 输出：

<project>
    <dependencies>
        <dependency>
            <groupId>com</groupId>
            <artifactId>passwordsdk</artifactId>
            <version>3.4.1</version>
        </dependency>
        <!-- For Compress JS -->
        <dependency>
            <groupId>com.yahoo.platform.yui</groupId>
            <artifactId>yuicompressor</artifactId>
            <version>2.4.7</version>
        </dependency>
        <dependency>
            <groupId>com.sybase</groupId>
            <artifactId>EccpressoFIPSJca</artifactId>
            <version>7.0</version>
        </dependency>

        <dependency>
            <groupId>com.data</groupId>
            <artifactId>EccpressoFIPS</artifactId>
            <version>7.0</version>
        </dependency>
        <dependency>
            <groupId>tesdt</groupId>
            <artifactId>xercesImpl</artifactId>
            <version>2.12.0</version>
        </dependency>
    </dependencies>
</project>

我使用 xpath 提取依赖项的代码

import java.io.StringWriter;
import java.nio.file.Files;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpressionException;
import javax.xml.xpath.XPathFactory;

import org.slf4j.Logger;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.xml.sax.SAXException;
public static void main (String args[]){
        





 Path c1=Paths.get(prop.getProperty("testPom"));
            Path c2=Paths.get(prop.getProperty("testPomweb"));
            //String pom = readFile(CfoServerModifications.class.getResourceAsStream(prop.getProperty("testPom")));
            //String web = readFile(CfoServerModifications.class.getResourceAsStream(prop.getProperty("testPomweb")));            
            String pomFile = new String(Files.readAllBytes(c1),StandardCharsets.UTF_8);
            String pomWeb = new String(Files.readAllBytes(c2),StandardCharsets.UTF_8);
            Document doc_web = Jsoup.parse(pomWeb,"",Parser.xmlParser());
            Document doc_pom = Jsoup.parse(pomFile,"",Parser.xmlParser());
            doc_pom.outputSettings().prettyPrint(false);
            doc_web.outputSettings().prettyPrint(false);
           // System.out.println(doc_pom.outputSettings().prettyPrint(false));
            Elements dependencies_web = doc_web.select("project>dependencies");
            Elements dependencies_pom = doc_pom.select("project>dependencies");
            //log.info(dependencies_web.toString());
            // remove the old dependencies
            dependencies_pom.clear();
            //log.info("pom clear"+dependencies_pom.toString());
            //add the new dependencies
            dependencies_pom.addAll(dependencies_web);
            //log.info("pom web added to pom "+dependencies_pom.toString());
           
            Files.write(Paths.get(prop.getProperty("dummyfile")),doc_pom.toString().getBytes());

标签： javaxpathreplacexml-parsingcontains

解决方案

我建议你使用Jsoup，它可以轻松解析 xml，而不是重新发明轮子。

将每个 xml 文件读取到内存，从一个 xml 复制依赖项节点并用另一个替换它们。

这是一个工作示例：

package replacexmlnode;

import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.nio.file.StandardOpenOption;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.parser.Parser;
import org.jsoup.select.Elements;


public class ReplaceXmlNode {
    
  public static void main(String[] args) throws IOException {
    
    String pom = readFile(ReplaceNode.class.getResourceAsStream("pom-plain.xml"));
    String web = readFile(ReplaceNode.class.getResourceAsStream("pom-web.xml"));
    
    Document doc_web = Jsoup.parse(web,"",Parser.xmlParser());
    Document doc_pom = Jsoup.parse(pom,"",Parser.xmlParser());
    
    Elements dependencies_web = doc_web.select("project>dependencies");

    //remove old dependencies        
    doc_pom.select("project>dependencies").remove();

    // add new dependencies
    doc_pom.select("project").first().appendChild(dependencies_web.first());       
    
    doc_pom.outputSettings().prettyPrint(false);
    Files.write(Paths.get("pom-plain_out.xml"), doc_pom.toString().getBytes());
 }

  public static String readFile(InputStream in) throws IOException{
   
    return new String(in.readAllBytes(), StandardCharsets.UTF_8);
 }
}

如果你使用 maven 从maven central获取 Jsoup 依赖

推荐阅读