httpURLConnection-网络请求的两种方式-get请求和post请求(java服务器调用别人的http接口)

用到的包

import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;

GET请求

     /**
     * 从网络获取json数据,(String byte[})

     * @param path
     * @return
     */
    public static String getJsonByInternet(String path) throws Exception{
        try {
            URL url = new URL(path.trim());
            //打开连接
            HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();

            if(200 == urlConnection.getResponseCode()){
                //得到输入流
                InputStream is =urlConnection.getInputStream();
                ByteArrayOutputStream baos = new ByteArrayOutputStream();
                byte[] buffer = new byte[1024];
                int len = 0;
                while(-1 != (len = is.read(buffer))){
                    baos.write(buffer,0,len);
                    baos.flush();
                }
                return baos.toString("utf-8");
            }
        }  catch (IOException e) {
            e.printStackTrace();
        }

        return null;
    }

POST测试

     /**
     * POST请求获取数据
     */
    public static String postDownloadJson(String path,String post){
        URL url = null;
        try {
            url = new URL(path);
            HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
            httpURLConnection.setRequestMethod("POST");// 提交模式
            // conn.setConnectTimeout(10000);//连接超时 单位毫秒
            // conn.setReadTimeout(2000);//读取超时 单位毫秒
            // 发送POST请求必须设置如下两行
            httpURLConnection.setDoOutput(true);
            httpURLConnection.setDoInput(true);
            // 获取URLConnection对象对应的输出流
            PrintWriter printWriter = new PrintWriter(httpURLConnection.getOutputStream());
            // 发送请求参数
            printWriter.write(post);//post的参数 xx=xx&yy=yy
            // flush输出流的缓冲
            printWriter.flush();
            //开始获取数据
            BufferedInputStream bis = new BufferedInputStream(httpURLConnection.getInputStream());
            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            int len;
            byte[] arr = new byte[1024];
            while((len=bis.read(arr))!= -1){
                bos.write(arr,0,len);
                bos.flush();
            }
            bos.close();
            return bos.toString("utf-8");
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

调用

    public static void main(String[] args) {
        String x = postDownloadJson("http://118.89.45.116/Book/index.php/API/GetAllBook/","");
        System.out.println(x);
    }
Last modification:December 14th, 2017 at 11:09 pm
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