HttpClient

1、post

/** 
     * 发送 post请求访问本地应用并根据传递参数不同返回不同结果 
     */  
    public void post() {  
        // 创建默认的httpClient实例.    
        CloseableHttpClient httpclient = HttpClients.createDefault();  
        // 创建httppost    
        HttpPost httppost = new HttpPost("http://localhost:8080/myDemo/Ajax/serivceJ.action");  
        // 创建参数队列    
        List<namevaluepair> formparams = new ArrayList<namevaluepair>();  
        formparams.add(new BasicNameValuePair("type", "house"));  
        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();  
            }  
        }  
    }  

2、get请求

/** 
     * 发送 get请求 
     */  
    public void get() {  
        CloseableHttpClient httpclient = HttpClients.createDefault();  
        try {  
            // 创建httpget.    
            HttpGet httpget = new HttpGet("http://www.baidu.com/");  
            System.out.println("executing request " + httpget.getURI());  
            // 执行get请求.    
            CloseableHttpResponse response = httpclient.execute(httpget);  
            try {  
                // 获取响应实体    
                HttpEntity entity = response.getEntity();  
                System.out.println("--------------------------------------");  
                // 打印响应状态    
                System.out.println(response.getStatusLine());  
                if (entity != null) {  
                    // 打印响应内容长度    
                    System.out.println("Response content length: " + entity.getContentLength());  
                    // 打印响应内容    
                    System.out.println("Response content: " + EntityUtils.toString(entity));  
                }  
                System.out.println("------------------------------------");  
            } finally {  
                response.close();  
            }  
        } catch (ClientProtocolException e) {  
            e.printStackTrace();  
        } catch (ParseException e) {  
            e.printStackTrace();  
        } catch (IOException e) {  
            e.printStackTrace();  
        } finally {  
            // 关闭连接,释放资源    
            try {  
                httpclient.close();  
            } catch (IOException e) {  
                e.printStackTrace();  
            }  
        }  
    }  

3、上传文件

/** 
     * 上传文件 
     */  
    public void upload() {  
        CloseableHttpClient httpclient = HttpClients.createDefault();  
        try {  
            HttpPost httppost = new HttpPost("http://localhost:8080/myDemo/Ajax/serivceFile.action");  
  
            FileBody bin = new FileBody(new File("F:\\image\\sendpix0.jpg"));  
            StringBody comment = new StringBody("A binary file of some kind", ContentType.TEXT_PLAIN);  
  
            HttpEntity reqEntity = MultipartEntityBuilder.create().addPart("bin", bin).addPart("comment", comment).build();  
  
            httppost.setEntity(reqEntity);  
  
            System.out.println("executing request " + httppost.getRequestLine());  
            CloseableHttpResponse response = httpclient.execute(httppost);  
            try {  
                System.out.println("----------------------------------------");  
                System.out.println(response.getStatusLine());  
                HttpEntity resEntity = response.getEntity();  
                if (resEntity != null) {  
                    System.out.println("Response content length: " + resEntity.getContentLength());  
                }  
                EntityUtils.consume(resEntity);  
            } finally {  
                response.close();  
            }  
        } catch (ClientProtocolException e) {  
            e.printStackTrace();  
        } catch (IOException e) {  
            e.printStackTrace();  
        } finally {  
            try {  
                httpclient.close();  
            } catch (IOException e) {  
                e.printStackTrace();  
            }  
        }  
    }  

4、getTest

@Test
    public void testListNear(){
        List<NameValuePair> params = new ArrayList<NameValuePair>();
        params.add(new BasicNameValuePair("city","310000"));
        params.add(new BasicNameValuePair("roleId","01"));
        params.add(new BasicNameValuePair("location", "116.312528|39.983733"));

        httpGet("/api/seller/listNearSellers.json",params);

    }

    /**
     * 封装get请求
     * @param linkURL
     * @param params
     */
    public void httpGet(String linkURL,List<NameValuePair> params){
        try {
            StringBuffer url = new StringBuffer();
            url.append("http://localhost:9900");
            url.append(linkURL);

            CloseableHttpClient httpClient = HttpClients.createDefault();
            //设置请求参数
            String str = EntityUtils.toString(new UrlEncodedFormEntity(params));

            HttpGet get = new HttpGet(url.toString());
            get.setURI(new URI(get.getURI().toString() + "?" + str));

            HttpResponse response = httpClient.execute(get);
            HttpEntity entity = response.getEntity();

            String result = EntityUtils.toString(entity, "UTF-8");
            System.out.println("url................." + url.toString());
            System.out.println("=============================================================================================================");
            System.out.println(result);
        } catch (IOException e) {
            e.printStackTrace();
        } catch (URISyntaxException e) {
            e.printStackTrace();
        }
    }