Java实现Http Post请求

我会带着你远行 2023-08-17 15:34 158阅读 0赞

两种请求方式

一 数据类型是json格式

package xxxxxxxxxxxxxx;
    
    import java.io.DataOutputStream;
    import java.io.InputStream;
    import java.net.URL;
    import java.net.URLConnection;
    
    import org.apache.poi.util.IOUtils;
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestMethod;
    import org.springframework.web.bind.annotation.RequestParam;
    import org.springframework.web.bind.annotation.RestController;
    
    import com.alibaba.fastjson.JSONObject;
    
    
    @RestController
    @RequestMapping(value = "/api")
    public class OutTestController {
    	private final Logger logger = LoggerFactory.getLogger(OutTestController.class);
    
    	@RequestMapping(value = "/testlink", method = RequestMethod.GET)
    	public String testlink(@RequestParam(value = "userid", required = false) String userid) {
    		logger.info("OutTestController ==> link()");
    		String url = "http://xxxxxxxxxxx";
    		// 声明json对象
    		JSONObject outData = new JSONObject();
    		// 把json数组加到json对象中
    		outData.put("loginName", "xxxxxxxxx");
    		outData.put("password", "xxxxxx");
    		String result = OutTestController.doHttpPost(outData, url);
    		return result;
    	}
    	
    	/**
    	 * 发送Http post请求
    	 * 
    	 * @return 返回信息
    	 */
    	public static String doHttpPost(JSONObject outData, String URL) {
    		System.out.println("发起的数据:" + outData.toString());
    		byte[] xmlData = outData.toString().getBytes();
    		InputStream instr = null;
    		java.io.ByteArrayOutputStream out = null;
    		try {
    			URL url = new URL(URL);
    			URLConnection urlCon = url.openConnection();
    			urlCon.setDoOutput(true);
    			urlCon.setDoInput(true);
    			urlCon.setUseCaches(false);
    			urlCon.setRequestProperty("Accept", "application/json");// 设置接收数据的格式
    			urlCon.setRequestProperty("Content-Type", "application/json");// 设置发送数据的格式
    			urlCon.setRequestProperty("charset", "utf-8");
    			urlCon.setRequestProperty("Content-length", String.valueOf(xmlData.length));
    			System.out.println(String.valueOf(xmlData.length));
    			DataOutputStream printout = new DataOutputStream(urlCon.getOutputStream());
    			printout.write(xmlData);
    			printout.flush();
    			printout.close();
    			instr = urlCon.getInputStream();
    			byte[] bis = IOUtils.toByteArray(instr);
    			String ResponseString = new String(bis, "UTF-8");
    			if ((ResponseString == null) || ("".equals(ResponseString.trim()))) {
    				System.out.println("返回空");
    			}
    			System.out.println("返回数据为:" + ResponseString);
    			return ResponseString;
    		} catch (Exception e) {
    			e.printStackTrace();
    			return "0";
    		} finally {
    			try {
    				out.close();
    				instr.close();
    			} catch (Exception ex) {
    				return "0";
    			}
    		}
    	}
    
    	
    }

二

String url = "http://xxxxxxxx";		
    
        String param = "aa="+aa+"&aa="+aa;			
    		    //发送 POST 请求		
    	String sr= PigNutritionalFormulaController.sendPost(url,param,"UTF-8");
    
      public static String sendPost(String url, String param,String charset) { 
        OutputStreamWriter out = null;
        BufferedReader in = null;
        String result = "";
        String line;
        StringBuffer sb=new StringBuffer();
        try {
            URL realUrl = new URL(url);
            // 打开和URL之间的连接
            URLConnection conn = realUrl.openConnection();
            // 设置通用的请求属性
       //     conn.setRequestProperty("accept", "*/*");
         //   conn.setRequestProperty("connection", "Keep-Alive");
          //  conn.setRequestProperty("user-agent",
           //         "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
          //  conn.setRequestProperty("Accept-Charset", "UTF-8");
          //  conn.setRequestProperty("contentType", "UTF-8");
            conn.setRequestProperty("Content-type", "application/x-www-form-urlencoded;charset=UTF-8");
           // conn.setRequestProperty("Accept-Language", "zh-cn");
            conn.setRequestProperty("Charset", "utf-8");
            conn.setConnectTimeout(1000000);
            conn.setReadTimeout(10000000);
           // conn.setRequestProperty("Accept-Language", Locale.getDefault().toString());
            // 发送POST请求必须设置如下两行
            conn.setDoOutput(true);
            conn.setDoInput(true);
            // 获取URLConnection对象对应的输出流
            out = new OutputStreamWriter(conn.getOutputStream(),"UTF-8");
            // 发送请求参数
            out.write(param);
    //        out.print(param);
            // flush输出流的缓冲
            out.flush();
            // 定义BufferedReader输入流来读取URL的响应
            in = new BufferedReader(
                    new InputStreamReader(conn.getInputStream(),charset));
            while ((line = in.readLine()) != null) {
            	sb.append(line);
            }
            result=sb.toString();
        } 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(in!=null){
                    in.close();
                }
            }
            catch(IOException ex){
                ex.printStackTrace();
            }
        }
        return result;
    }    
    }