java代码发送body参数。

原创已于 2023-02-12 09:57:17 修改 · 1.9k 阅读

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#java #http

于 2022-02-07 11:43:55 首次发布

本文介绍了如何在Java中通过Fastjson库实现POST请求，并设置了请求头，同时借助Hutool库简化文件下载过程。

jar

<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>fastjson</artifactId>
    <version>1.2.21</version>
</dependency>

/**
 * POST方法提交body请求.
 *  body参数在 JSONObject parm里面
 */
public static String post(String requestUrl, JSONObject parm) throws Exception{
    //响应的内容
    StringBuffer stringBuffer = new StringBuffer();
    URL url = new URL(requestUrl);
    HttpURLConnection connection = (HttpURLConnection)url.openConnection();
    connection.setRequestMethod("POST");//请求post方式
    connection.setDoInput(true);
    connection.setDoOutput(true);

    //header内的的参数在这里设置  setRequestProperty("健, "值");
    connection.setRequestProperty("Content-Type", "application/json");
    //connection.setRequestProperty("", "");
    connection.connect();
    OutputStreamWriter outputStreamWriter = new OutputStreamWriter(connection.getOutputStream(),"UTF-8");

    outputStreamWriter.write(parm.toString());
    outputStreamWriter.flush();
    InputStream inputStream = connection.getInputStream();
    BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"));
    String strRead = null;
    while ((strRead = bufferedReader.readLine()) != null) {
        stringBuffer.append(strRead);
        stringBuffer.append("\r\n");
    }
    bufferedReader.close();
    connection.disconnect();
    String results = stringBuffer.toString();
    return results;
}

java 调用http连接请求头中放置token等信息下载文件

jar

<groupId>cn.hutool</groupId>

<artifactId>hutool-all</artifactId>

</dependency>

代码

import cn.hutool.http.HttpRequest;

   byte[] bytes = HttpRequest.get(downFileUrl)
   .header("Content-Type", "application/x-www-form-urlencoded; charset=utf-8")
   .execute().bodyBytes();
   InputStream is = new ByteArrayInputStream(bytes);

参考： https://blog.youkuaiyun.com/weixin_42620563/article/details/114235588