java中post，get带参请求页面

港控/mmm° 2024-04-18 06:30 49阅读 0赞

#### post提交表单 ####

导入httpclient包

import org.apache.http.HttpEntity;
    import org.apache.http.client.ClientProtocolException;
    import org.apache.http.client.entity.UrlEncodedFormEntity;
    import org.apache.http.client.methods.CloseableHttpResponse;
    import org.apache.http.client.methods.HttpPost;
    import org.apache.http.impl.client.CloseableHttpClient;
    import org.apache.http.impl.client.HttpClients;
    import org.apache.http.message.BasicNameValuePair;
    import org.apache.http.util.EntityUtils;
    import org.apache.http.NameValuePair;
    
    import java.io.IOException;
    import java.io.UnsupportedEncodingException;
    import java.util.ArrayList;
    import java.util.List;

public void postForm() { 
            // 创建默认的httpClient实例.
            CloseableHttpClient httpclient = HttpClients.createDefault();
            // 创建httppost
            HttpPost httppost = new HttpPost("http://vo.sya.edu.cn");
            // 创建参数队列
            List<NameValuePair> formparams = new ArrayList<NameValuePair>();
            formparams.add(new BasicNameValuePair("username", "admin"));
            formparams.add(new BasicNameValuePair("password", "123456"));
            UrlEncodedFormEntity uefEntity;
            try { 
                uefEntity = new UrlEncodedFormEntity(formparams, "UTF-8");
                httppost.setEntity(uefEntity);
                System.out.println("executing request " + httppost.getURI());
                CloseableHttpResponse response = httpclient.execute(httppost);
                try { 
                    HttpEntity entity = response.getEntity();
                    if (entity != null) { 
                        System.out.println("--------------------------------------");
                        System.out.println("Response content: " + EntityUtils.toString(entity, "UTF-8"));
                        System.out.println("--------------------------------------");
                    }
                } finally { 
                    response.close();
                }
            } catch (ClientProtocolException e) { 
                e.printStackTrace();
            } catch (UnsupportedEncodingException e1) { 
                e1.printStackTrace();
            } catch (IOException e) { 
                e.printStackTrace();
            } finally { 
                // 关闭连接,释放资源
                try { 
                    httpclient.close();
                } catch (IOException e) { 
                    e.printStackTrace();
                }
            }
        }

#### get请求页面HTML ####

//get请求获得页面
        public String getHtml(String url){ 
            CloseableHttpClient httpClient = ReturnObject.httpClient;
            HttpGet httpGet = new HttpGet(url);
    
            CloseableHttpResponse response = null;
            try { 
                response = httpClient.execute(httpGet);
            } catch (IOException e) { 
                e.printStackTrace();
            }
    
            HttpEntity entity = response.getEntity();
            try { 
                return EntityUtils.toString(entity,"utf-8");
            } catch (IOException e) { 
                e.printStackTrace();
            }
            return null;
        }

#### 模拟浏览器发送get请求登录 ####

public void method(){ 
    	//1.生成httpclient，相当于该打开一个浏览器
        CloseableHttpClient httpClient1 = httpclient;
        CloseableHttpResponse response1 = null;
        //2.创建get请求，相当于在浏览器地址栏输入 网址
        HttpGet request = new HttpGet("http://210.47.163.27:9002/gradeLnAllAction.do?type=ln&oper=lnfaqk&flag=zx");
        try { 
           //3.执行get请求，相当于在输入地址栏后敲回车键
            response1 = httpClient1.execute(request);
    
            //4.判断响应状态为200，进行处理
            if(response1.getStatusLine().getStatusCode() == HttpStatus.SC_OK) { 
            //5.获取响应内容
            HttpEntity httpEntity = response1.getEntity();
            String html = EntityUtils.toString(httpEntity, "GBK");
            System.out.println(html);
            } else { 
            //如果返回状态不是200，比如404（页面不存在）等，根据情况做处理，这里略
            System.out.println("返回状态不是200");
            System.out.println(EntityUtils.toString(response1.getEntity(), "utf-8"));
                        }
            } catch (ClientProtocolException e) { 
                e.printStackTrace();
            } catch (IOException e) { 
                 e.printStackTrace();
             } finally { 
            //6.关闭
             HttpClientUtils.closeQuietly(response1);
              HttpClientUtils.closeQuietly(httpClient1);
           }
    }