在java中如何实现http/post/xml发送数据报文？麻烦高手赐教！

Posted 2023-05-01

合作商提供的接口规则和形式如下：
接口通过Http + Post + XML 的形式，通过Http做为协议，POST做为传输方式，XML作为传输数据格式。

参考技术A stringBuilder拼接成一个XML字符串。然后调用HTTP类访问一个SERVLET，（具体HTTP类我记不清楚了。你们应用里如果有人开发过。你可以抄一抄），之后会获得一个返回流，这个流就是XML。再使用DOM4J或者JDOM解析。追问

谢谢您的问答，请问有具体的事例代码吗？

追答

现在没有。晚上回去我找找给你贴一个。

本回答被提问者采纳

Java URLConnection实现HTTP的GET/POST

public static String doGet(String url, String param) {
        String result = "";
        BufferedReader in = null;
        try {
            String urlNameString = url + "?" + param;
            URL realUrl = new URL(urlNameString);
            URLConnection connection = realUrl.openConnection();
            connection.setRequestProperty("accept", "*/*");
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            connection.connect();
            in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            try {in.close();} catch (Exception ex) {}
        	return null;
        }
        try {in.close();} catch (Exception e) {}
        return result;
    }
	
	public static String doPost(String url, String param) {
        PrintWriter out = null;
        BufferedReader in = null;
        String result = "";
        try {
            URL realUrl = new URL(url);
            URLConnection conn = realUrl.openConnection();
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            conn.setDoOutput(true);
            conn.setDoInput(true);
            out = new PrintWriter(conn.getOutputStream());
            out.print(param);
            out.flush();
            in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            try{out.close();}catch(Exception ex){}
            try{in.close();}catch(Exception ex){}
        	return null;
        }
        try{out.close();}catch(Exception ex){}
        try{in.close();}catch(Exception ex){}
        return result;
    }