Question

我有一个在本地TOMCAT中运行的servletOne，而servletTwo部署在远程位置的不同TOMCAT中。我想访问在servletTwo中设置的值（Array / ArrayList）。我不知道该怎么做。我看过不同的例子，但没有什么工作。这就是我到目前为止所拥有的。这是我的doPost

 doGet(req, resp);

//doGet
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException
{
 ArrayList al = new ArrayList();

    al.add("valOne");
    al.add("valTwo");
    //Should I use this
    PrintWriter out = resp.getWriter();
    out.println(al);
    //Or should I use this
    req.setAttribute("ArrayList", al);
}

现在我想从servletOne

访问arraylist

在servletOne中我有，

try
    {
        URL url = new URL("http://myhost:8080/servletTest");
        URLConnection conn = url.openConnection();
        conn.setDoOutput(true);

        BufferedReader in =
                new BufferedReader(new InputStreamReader(conn.getInputStream()));

        String response;
        while ((response = in.readLine()) != null)
        {
            System.out.println(response);

        }
        in.close();
    }
    catch (MalformedURLException ex)
    {
        // handle this exception
    }
    catch (IOException ex)
    {
        // handle this exception
    }

 }

我认为它不会起作用，因为我从字符串中获取值而不是servletOne中的数组。任何帮助将不胜感激。提前谢谢。

Answer 1

您可以使用JSON：

protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException
{
 ArrayList al = new ArrayList();

    al.add("valOne");
    al.add("valTwo");
    //Should I use this
    PrintWriter out = resp.getWriter();
    out.println(al);
    //Or should I use this
   // req.setAttribute("ArrayList", al);

//create al object to JSOn and send it another servlet on another tomcat


  Gson gson=new Gson();

  String jsonlist=gson.toJson(al)

  String url = "http://example.com/query?q=" + URLEncoder.encode(jsonlist,    "UTF-8");

}

在一个servlet中设置值并从不同的servlet

1 个答案: