java Post 上传文件

た入场券 2022-11-26 08:37 282阅读 0赞

package com.ckn.web.main;  
      
    import java.io.BufferedReader;  
    import java.io.DataInputStream;  
    import java.io.File;  
    import java.io.FileInputStream;  
    import java.io.InputStreamReader;  
    import java.io.OutputStream;  
    import java.net.HttpURLConnection;  
    import java.net.URL;  
      
    public class JavaDirectUpload {  
          
        public static void uploadFile(String urlStr, String  formName,String fileName) {  
            try {  
                // 换行符  
                final String newLine = "\r\n";  
                final String boundaryPrefix = "--";  
                // 定义数据分隔线  
                String BOUNDARY = "========7d4a6d158c9";  
                // 服务器的域名  
                URL url = new URL(urlStr);  
                HttpURLConnection conn = (HttpURLConnection) url.openConnection();  
                // 设置为POST情  
                conn.setRequestMethod("POST");  
                // 发送POST请求必须设置如下两行  
                conn.setDoOutput(true);  
                conn.setDoInput(true);  
      
                // 设置请求头参数  
                conn.setRequestProperty("connection", "Keep-Alive");  
                conn.setRequestProperty("Charsert", "UTF-8");  
                conn.setRequestProperty("Content-Type","multipart/form-data; boundary=" + BOUNDARY);  
                OutputStream out = conn.getOutputStream();  
                // 上传文件  
                File file = new File(fileName);  
                StringBuilder sb = new StringBuilder();  
                sb.append(boundaryPrefix);  
                sb.append(BOUNDARY);  
                sb.append(newLine);  
                // 文件参数,photo参数名可以随意修改  
                sb.append("Content-Disposition: form-data;name=\""+formName+"\";filename=\""+ fileName + "\"" + newLine);  
                sb.append("Content-Type:application/octet-stream");  
                // 参数头设置完以后需要两个换行，然后才是参数内容  
                sb.append(newLine);  
                sb.append(newLine);  
                // 将参数头的数据写入到输出流中  
                out.write(sb.toString().getBytes());  
                // 数据输入流,用于读取文件数据  
                DataInputStream in = new DataInputStream(new FileInputStream(file));  
                byte[] bufferOut = new byte[1024];  
                int bytes = 0;  
                // 每次读1KB数据,并且将文件数据写入到输出流中  
                while ((bytes = in.read(bufferOut)) != -1) {  
                    out.write(bufferOut, 0, bytes);  
                }  
                // 最后添加换行  
                out.write(newLine.getBytes());  
                in.close();  
                // 定义最后数据分隔线，即--加上BOUNDARY再加上--。  
                byte[] end_data = (newLine + boundaryPrefix + BOUNDARY  
                        + boundaryPrefix + newLine).getBytes();  
                // 写上结尾标识  
                out.write(end_data);  
                out.flush();  
                out.close();  
                  
                //定义BufferedReader输入流来读取URL的响应  
                BufferedReader reader = new BufferedReader(new InputStreamReader(  
                conn.getInputStream()));  
                String line = null;  
                while ((line = reader.readLine()) != null) {  
                    System.out.println(line);  
                }  
            } catch (Exception e) {  
                System.out.println("发送POST请求出现异常！" + e);  
                e.printStackTrace();  
            }  
        }  
          
        public static void main(String[] args){  
            String wxUrlStr="https://api.weixin.qq.com/cgi-bin/media/uploadimg?access_token=auto_581";  
            String formName="media";  
            String fileFullPath="D:\\Users\\ex-chengyibo600\\Desktop\\TRANSFILE\\newCarLoan\\1447738780798_Jellyfish.jpg";  
            uploadFile(wxUrlStr,formName,fileFullPath);  
        }  
      
    }