java http 接收xml参数_读写xml并使用xml文件进行参数传递给接口获取返回内容——wishPost请求物流单号为例...

首先，我们可以使用Java中的DOM或SAX库来读写XML文件。以下是使用DOM库的示例代码：

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

// 读取XML文件
public static void readXML(String filePath) {
    try {
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        DocumentBuilder builder = factory.newDocumentBuilder();
        Document doc = builder.parse(filePath);
        
        // 获取根节点
        Element root = doc.getDocumentElement();
        
        // 获取子节点
        NodeList nodeList = root.getElementsByTagName("wishPost");
        Node node = nodeList.item(0);
        
        // 获取物流单号
        if (node.getNodeType() == Node.ELEMENT_NODE) {
            Element element = (Element) node;
            String logisticsNo = element.getElementsByTagName("logisticsNo").item(0).getTextContent();
            System.out.println("物流单号：" + logisticsNo);
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
}

// 写入XML文件
public static void writeXML(String filePath, String logisticsNo) {
    try {
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        DocumentBuilder builder = factory.newDocumentBuilder();
        Document doc = builder.newDocument();
        
        // 创建根节点
        Element root = doc.createElement("root");
        doc.appendChild(root);
        
        // 创建子节点
        Element wishPost = doc.createElement("wishPost");
        root.appendChild(wishPost);
        
        Element logisticsNoNode = doc.createElement("logisticsNo");
        logisticsNoNode.appendChild(doc.createTextNode(logisticsNo));
        wishPost.appendChild(logisticsNoNode);
        
        // 写入XML文件
        TransformerFactory transformerFactory = TransformerFactory.newInstance();
        Transformer transformer = transformerFactory.newTransformer();
        DOMSource source = new DOMSource(doc);
        StreamResult result = new StreamResult(new File(filePath));
        transformer.transform(source, result);
    } catch (Exception e) {
        e.printStackTrace();
    }
}

然后，我们可以使用Java的HttpURLConnection类来发送HTTP请求，并将XML文件作为请求参数。以下是示例代码：

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;

public static void sendPostRequest(String url, String xmlFilePath) {
    try {
        // 读取XML文件
        BufferedReader br = new BufferedReader(new FileReader(xmlFilePath));
        StringBuilder sb = new StringBuilder();
        String line;
        while ((line = br.readLine()) != null) {
            sb.append(line);
        }
        String xmlString = sb.toString();
        br.close();
        
        // 发送POST请求
        URL obj = new URL(url);
        HttpURLConnection con = (HttpURLConnection) obj.openConnection();
        con.setRequestMethod("POST");
        con.setRequestProperty("User-Agent", "Mozilla/5.0");
        con.setRequestProperty("Content-Type", "application/xml");
        con.setDoOutput(true);
        OutputStream os = con.getOutputStream();
        os.write(xmlString.getBytes("UTF-8"));
        os.flush();
        os.close();
        
        // 获取返回内容
        BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
        sb = new StringBuilder();
        while ((line = in.readLine()) != null) {
            sb.append(line);
        }
        String response = sb.toString();
        in.close();
        
        System.out.println("返回内容：" + response);
    } catch (Exception e) {
        e.printStackTrace();
    }
}

以上代码演示了如何使用XML文件作为参数发送HTTP请求，并从响应中获取返回内容。其中url参数是接口的URL地址，xmlFilePath参数是XML文件的路径。