execute a jsp program on background of a running java program

问题

I just want execute my jsp program when a button on my running java program is clicked, it doesn't need to be visible, the jsp program i am saying is for printing and once it is loaded in the browser it will just pop up the print dialog confirm box, so again it doesn't need to be visible, once the button in my java program is clicked the print dialog will just pop up and that's it. By the way i am new here in this site, and also know only basics of java, so i do not have any idea how to do it, but i like to do it that way and with just a link of the jsp page from the localhost, something like that,

Thanks in advance buddies! Hope you will help me!...

回答1:

this should be working , cant be sure if it serves properly , please assure me the outcome

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;


    public class callURL {
    public static void main(String[] args) 
    {
        String url = "http://localhost:8080/OpenID/asd.html";
        HttpClient httpClient = new DefaultHttpClient();
        HttpPost httpPost = new HttpPost(url);
        HttpResponse response;
        StringBuilder builder= new StringBuilder();
        try 
        {
            response = httpClient.execute(httpPost);
            BufferedReader in = new BufferedReader(new InputStreamReader(response.getEntity().getContent(), "UTF-8"));
            char[] buf = new char[8000];
            int l = 0;
                while (l >= 0) 
                {
                    builder.append(buf, 0, l);
                    l = in.read(buf);
                }

        } 
        catch (ClientProtocolException e) 
        {
            e.printStackTrace();
        } 
        catch (IOException e) 
        {
            e.printStackTrace();
        } 
    }
}

for this java program to ececute your jsp

you have to add this line in your jsp page

<script>
window.location.href="http://localhost:8080/OpenID/asd.html"
</script>

where OpenId : Application Name
asd.html is your jsp page , the same jsp which you are calling from java program

来源：https://stackoverflow.com/questions/14493601/execute-a-jsp-program-on-background-of-a-running-java-program