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  • java模拟post请求发送json数据


    import com.alibaba.fastjson.JSONObject; import org.apache.http.client.methods.CloseableHttpResponse; import org.apache.http.client.methods.HttpPost; import org.apache.http.entity.ContentType; import org.apache.http.entity.StringEntity; import org.apache.http.impl.client.CloseableHttpClient; import org.apache.http.impl.client.HttpClients; import org.apache.http.util.EntityUtils; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.io.OutputStreamWriter; import java.net.HttpURLConnection; import java.net.URL;
    public class HttpRequest2 { public static String sendPost(String url,String param){ OutputStreamWriter out =null; BufferedReader reader = null; String response = ""; //创建连接 try { URL httpUrl = null; //HTTP URL类 用这个类来创建连接 //创建URL httpUrl = new URL(url); //建立连接 HttpURLConnection conn = (HttpURLConnection) httpUrl.openConnection(); conn.setRequestMethod("POST"); conn.setRequestProperty("Content-Type", "application/json"); conn.setRequestProperty("connection", "keep-alive"); conn.setUseCaches(false);//设置不要缓存 conn.setInstanceFollowRedirects(true); conn.setDoOutput(true); conn.setDoInput(true); conn.connect(); //POST请求 out = new OutputStreamWriter( conn.getOutputStream()); out.write(param); out.flush(); //读取响应 reader = new BufferedReader(new InputStreamReader( conn.getInputStream())); String lines; while ((lines = reader.readLine()) != null) { lines = new String(lines.getBytes(), "utf-8"); response+=lines; } reader.close(); // 断开连接 conn.disconnect(); } catch (Exception e) { System.out.println("发送 POST 请求出现异常!"+e); e.printStackTrace(); } //使用finally块来关闭输出流、输入流 finally{ try{ if(out!=null){ out.close(); } if(reader!=null){ reader.close(); } } catch(IOException ex){ ex.printStackTrace(); } } return response; } public static String sendPost2(String url, String data) { String response = null; try { CloseableHttpClient httpclient = null; CloseableHttpResponse httpresponse = null; try { httpclient = HttpClients.createDefault(); HttpPost httppost = new HttpPost(url); StringEntity stringentity = new StringEntity(data, ContentType.create("text/json", "UTF-8")); httppost.setEntity(stringentity); httpresponse = httpclient.execute(httppost); response = EntityUtils .toString(httpresponse.getEntity()); } finally { if (httpclient != null) { httpclient.close(); } if (httpresponse != null) { httpresponse.close(); } } } catch (Exception e) { e.printStackTrace(); } return response; } public static void main(String[] args) { JSONObject jsonParam = new JSONObject(); jsonParam.put("id", "12306"); jsonParam.put("name", "zhangsan"); String param = jsonParam.toJSONString(); String url="http://localhost:8080/demo/one"; String sendPost = sendPost2(url, param); System.out.println(sendPost); } }

    下面是后台的代码

    @RestController
    @RequestMapping("/demo")
    public class PostController {
    
        @Resource
        protected HttpServletRequest request;
    
        @RequestMapping(value = "/one",method = RequestMethod.POST)
        public String getResult(String str)throws Exception{
    
            InputStreamReader reader = new InputStreamReader(request.getInputStream(),"UTF-8");
            char[] buff = new char[1024];
            int length =0;
            while((length =reader.read(buff))!=-1){
                String message = new String(buff,0,length);
                System.out.println("接收到的信息   "+ message);
            }
    
            return JSON.toJSONString("这是post请求");
        }
    }

     依赖的jar包

     <!--http 请求需要的jar包-->
            <dependency>
                <groupId>org.apache.httpcomponents</groupId>
                <artifactId>httpcore</artifactId>
                <version>4.4.10</version>
            </dependency>
            <dependency>
                <groupId>org.apache.httpcomponents</groupId>
                <artifactId>httpclient</artifactId>
                <version>4.5.6</version>
            </dependency>
    
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  • 原文地址:https://www.cnblogs.com/zhuguangzhe/p/10751459.html
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