两个javaweb项目之间的通讯

1.使用httpclientjava

（1）//get方式
public static String doGet(String url,Map<String, String> param){
        CloseableHttpClient httpClient = HttpClients.createDefault();
        String resultString = "";
        CloseableHttpResponse response = null;
        try {
            URIBuilder builder = new URIBuilder(url);
            if(param!=null){
                for(String key:param.keySet()){
                    builder.addParameter(key,param.get(key));
                }
            }
            URI uri = builder.build();
            HttpGet httpGet = new HttpGet(uri);
            response = httpClient.execute(httpGet);
            if(response.getStatusLine().getStatusCode()==200){
                resultString = EntityUtils.toString(response.getEntity());
            }
        } catch (Exception e) {
            e.printStackTrace();
        }finally{
            try {
                if(response!=null){
                    response.close();
                }
                httpClient.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return resultString;

    }

注意事项：json

1.若是返回的是一个json对象，服务端的响应方法上要加@responsbody注解，不然获取的响应头中值为“”；ui

2.目标项目的ip和端口要写对，我写错端口号结果返回过来一个页面url