小编sus*_*hil的帖子

我用Java开始了一个小项目.
我必须创建一个客户端,它将xml作为HTTP POST请求发送到url.
我尝试使用java.net.* 包(以下是一段代码),但我得到如下错误:

java.io.IOException: Server returned HTTP response code: 500 for URL: "target url"
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1441)
    at newExample.main(newExample.java:36)

我的代码如下:

try {
        URL url = new URL("target url");

        URLConnection connection = url.openConnection();

        if( connection instanceof HttpURLConnection )
            ((HttpURLConnection)connection).setRequestMethod("POST");

        connection.setRequestProperty("Content-Length", Integer.toString(requestXml.length()) );
        connection.setRequestProperty("Content-Type","text/xml; charset:ISO-8859-1;");
        connection.setDoOutput(true);
        connection.connect();           

        // Create a writer to the url
        PrintWriter writer = new PrintWriter(new
        OutputStreamWriter(connection.getOutputStream()));

        // Get a reader from the url
        BufferedReader reader = new BufferedReader(new
        InputStreamReader(connection.getInputStream()));

        writer.println();
        writer.println(requestXml);
        writer.println();
        writer.flush();

        String line = …