Java USES HttpClient to simulate the application and considerations of POST form operations
- 2020-05-09 18:33:03
- OfStack
HttpClient USES the post method to submit data source code:
package post;
import Java.io.IOException;
import org.apache.commons.httpclient.Header;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.NameValuePair;
import org.apache.commons.httpclient.methods.PostMethod;
public class PostHttp {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
HttpClient httpClient = new HttpClient();
String url = "http://193.167.13.21/setup.cgi";
PostMethod postMethod = new PostMethod(url);
// Fill in the values for each form field
NameValuePair[] data = {
new NameValuePair("ID", "11"),
new NameValuePair("mtg", "0"),
new NameValuePair("haveCookie", "0"),
new NameValuePair("backID", "30"),
new NameValuePair("psw", "password")
};
// Put the value of the form in postMethod In the
postMethod.setRequestBody(data);
// perform postMethod
int statusCode = 0;
try {
statusCode = httpClient.executeMethod(postMethod);
} catch (HttpException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
// HttpClient For requests to accept subsequent services, like POST and PUT Cannot automatically handle forwarding
// 301 or 302
if (statusCode == HttpStatus.SC_MOVED_PERMANENTLY || statusCode == HttpStatus.SC_MOVED_TEMPORARILY)
{
// Extract the address of the steering from the head
Header locationHeader = postMethod.getResponseHeader("location");
String location = null;
if (locationHeader != null) {
location = locationHeader.getValue();
System.out.println("The page was redirected to:" + location);
}
else {
System.err.println("Location field value is null.");
}
return;
}
else
{
System.out.println(postMethod.getStatusLine());
String str = "";
try {
str = postMethod.getResponseBodyAsString();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println(str);
}
postMethod.releaseConnection();
return ;
}
}
// this is the login information of a user authentication process
Among the required jar packages:
1, httpclient commons - 3.1 - rc1. zip http: / / jakarta apache. org commons/httpclient/downloads html
2, commons codec - 1.3. jar http: / / jakarta apache. org/site/downloads/downloads_commons - codec. cgi
. 3, commons logging - api jar in tomcat5. 5 Tomcat in 5.5 / bin directory or http: / / jakarta apache. org/site/downloads/downloads_commons - logging. cgi