1 package main; 2  3 import java.io.IOException; 4  5 import javax.servlet.ServletException; 6 import javax.servlet.http.HttpServlet; 7 import javax.servlet.http.HttpServletRequest; 8 import javax.servlet.http.HttpServletResponse; 9 10 public class Save extends HttpServlet {11 12     @Override13     protected void service(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {14         req.getRequestDispatcher("WEB-INF/save.html").forward(req, res);15     }16 17     18     19 }

package main;import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class ToSave extends HttpServlet {    @Override    protected void service(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {        System.out.println(req.getParameter("t"));        req.getRequestDispatcher("WEB-INF/save.html").forward(req, res);    }        }

1  2  3  4 
      5  6  7  8     
保存
 9     
     
      10         
      11         
      12     
     
13 14 

简单的提交页面。

通过分析，可以知道保存时候发生的请求。

这里也可以知道传递了那些参数。

这里简单的demo只需要穿文本区的内容就可以了。

1 package httpclient.demo; 2  3 import java.io.IOException; 4 import java.util.ArrayList; 5 import java.util.List; 6  7 import org.apache.http.Header; 8 import org.apache.http.HttpEntity; 9 import org.apache.http.NameValuePair;10 import org.apache.http.client.ClientProtocolException;11 import org.apache.http.client.entity.UrlEncodedFormEntity;12 import org.apache.http.client.methods.CloseableHttpResponse;13 import org.apache.http.client.methods.HttpGet;14 import org.apache.http.client.methods.HttpPost;15 import org.apache.http.impl.client.CloseableHttpClient;16 import org.apache.http.impl.client.HttpClients;17 import org.apache.http.message.BasicNameValuePair;18 import org.apache.http.protocol.HTTP;19 import org.apache.http.util.EntityUtils;20 21 public class LoginDemo4 {22 23     public static void main(String[] args) {24         // HttpClientBuilder.create().build()25         CloseableHttpClient httpClient = null;26         HttpPost post = null;27         try {28             httpClient = HttpClients.createDefault();29             //登录30             post = new HttpPost("http://localhost:8080/WEB_TEST/toSave.do");31             post.setHeader("User-Agent",32                     "Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36");33             34             //传递所需参数35             List
     
       params=new ArrayList
      
       ();  36             params.add(new BasicNameValuePair("t","Hello World!!"));  37             38             post.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8));39             CloseableHttpResponse response = httpClient.execute(post);40             HttpEntity entity = response.getEntity();41             if (entity != null) {42                 String str = EntityUtils.toString(entity, "utf-8");43                 System.out.println(str);44             }45             46         } catch (ClientProtocolException e) {47             e.printStackTrace();48         } catch (IOException e) {49             e.printStackTrace();50         } finally {51             try {52                 if (post != null) {53                     post.releaseConnection();54                 }55                 if (httpClient != null) {56                     httpClient.close();57                 }58             } catch (IOException e) {59                 // TODO Auto-generated catch block60                 e.printStackTrace();61             }62         }63     }64 65 }
      
     

 

 运行结果可知，httpclient的demo成功发出了保存请求，并获取到了传递的参数，即文本区域内容。