JAVA中实现API对接时POST请求

在对接接口的时候，比如使用第三方的API接口时，需要在服务器端进行请求（比如接口端有地址校验，只能通过接口端地址访问的请求才能被通过），此时需要在后台完成接口的请求。

1.POST请求

1.1 首先先写一个post请求的通用方法

 public static String httpPost(String urlStr,Map<String,String> params){
         URL connect;
         StringBuffer data = new StringBuffer();  
        try {  
            connect = new URL(urlStr);  
            HttpURLConnection connection = (HttpURLConnection)connect.openConnection();  
            connection.setRequestMethod("POST");  
            connection.setDoOutput(true); 
            connection.setDoInput(true);
            connection.setUseCaches(false);//post不能使用缓存
            connection.setInstanceFollowRedirects(true);
            connection.setRequestProperty("accept", "*/*");
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            OutputStreamWriter paramout = new OutputStreamWriter(  
                    connection.getOutputStream(),"UTF-8"); 
            String paramsStr = "";   //拼接Post 请求的参数
           for(String param : params.keySet()){
               paramsStr += "&" + param + "=" + params.get(param);
           }  
           if(!paramsStr.isEmpty()){
               paramsStr = paramsStr.substring(1);
           }
            paramout.write(paramsStr);  
            paramout.flush();  
            BufferedReader reader = new BufferedReader(new InputStreamReader(  
                    connection.getInputStream(), "UTF-8"));  
            String line;              
            while ((line = reader.readLine()) != null) {          
                data.append(line);            
            }  
          
            paramout.close();  
            reader.close();  
        } catch (Exception e) {  
            // TODO Auto-generated catch block  
            e.printStackTrace();  
        }  
       return data.toString();
    }

1.2 写一个调用post请求的接口方法

如果需要外面访问某些页面的时候进行调用，可以在前端写好方法，再在后端配置相应接口，里面后台配置对应参数调用。

  getJsapiTicket(){
        var Token = localStorage.getItem("Token_");
        axios.defaults.headers.common['token'] = Token;
        axios.request({
                url: 'http://XXXX/getSignature',
                method: 'GET'
       }).then(res => {
                if(res){
                               ******
                }                    
      })             
 },          

@GetMapping("/getJsapiTicket")
public RestResult getJsapiTicket(XXX XXX){
    Map<String, String> map=new HashMap<>();
    map.put("key1","value1");
    map.put("key2", "value2");
    return httpPost(url,map);
}