Question

我想将一个序列化对象从Java类发送到servlet应该检索的servlet，并将该对象保存为文件。我知道我必须使用HttpURLConnection向servlet发出POST请求，但我不知道下面的代码是否正确。

private static HttpURLConnection urlCon;
private static ObjectOutputStream out;

public static void main(String[] args) {

    Names names = new Names();
    names.setName("ABC");
    names.setPlace("Bangalore");
    URL url;
    try {
        url = new URL("http://localhost:6080/HttpClientSerializable/HttpPostServlet");
    try {
        out = (ObjectOutputStream) urlCon.getOutputStream();
        out.writeObject(names);
        urlCon = (HttpURLConnection) url.openConnection();
        urlCon.setRequestMethod("POST");
        urlCon.setDoOutput(true);
        out.close();
        } catch (IOException e) {
            e.printStackTrace();
        }

        } catch (MalformedURLException e1) {
            e1.printStackTrace();
        }
}

在servlet中，我有以下代码：

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        ObjectInputStream in = new ObjectInputStream(request.getInputStream());
        try {
            names = (Names) in.readObject();

        } catch (ClassNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        in.close();
        ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream("C:/Documents and Settings/RAGASTH/Desktop/Names"));
        out.writeObject(names);
        out.close();

    }

我该怎么做才能让它发挥作用？另外，我希望servlet将它收到的对象作为响应发回。

任何帮助将不胜感激。谢谢！

Answer 1

你需要

确保Names类实现java.io.Serializable标记界面。
从servlet的outputstream创建一个ObjectOutputStream，如下所示：
```
out = new ObjectOutputStream(urlCon.getOutputStream());
```
在接收方，一旦从servlet的输入流中读取对象并保留在文件中，请将其写回响应的输出流，如下所示：
```
out = new ObjectOutputStream(response.getOutputStream());
out.writeObject(names);
out.close();
```

在发件人方面：

Names names = new Names();
names.setName("ABC");
names.setPlace("Bangalore");
URL url;
try {
    url = new URL("http://localhost:6080/HttpClientSerializable/HttpPostServlet");
    urlCon = (HttpURLConnection) url.openConnection();

    urlCon.setDoOutput(true); // to be able to write.
    urlCon.setDoInput(true); // to be able to read.

    out = new ObjectOutputStream(urlCon.getOutputStream());
    out.writeObject(names);
    out.close();

    ObjectInputStream ois = new ObjectInputStream(urlCon.getInputStream());
    names = (Names) ois.readObject();
    ois.close();
} catch (IOException e) {
    e.printStackTrace();
}
catch (MalformedURLException e1) {
    e1.printStackTrace();
}

在接收方：

ObjectInputStream in = new ObjectInputStream(request.getInputStream());
try {
    names = (Names) in.readObject();
} catch (ClassNotFoundException e) {
    e.printStackTrace();
}
in.close();
ObjectOutputStream out = new ObjectOutputStream(
    new FileOutputStream("C:/Documents and Settings/RAGASTH/Desktop/Names"));
out.writeObject(names);
out.close();

ObjectOutputStream oos = new ObjectOutputStream(response.getOutputStream());
oos.writeObject(names);
oos.close();

如何使用HttpURLConnection将序列化对象从Java类发送到Servlet？

1 个答案: