Java 后台POST模拟文件上传

时间：2021-10-02 16:28:01

概述

　　废话不多说，直接撸代码

代码

　　1、引入Maven包

<dependency>

            <groupId>org.apache.httpcomponents</groupId>

            <artifactId>httpclient</artifactId>

            <version>4.5</version>

        </dependency>

        <dependency>

            <groupId>org.apache.httpcomponents</groupId>

            <artifactId>httpmime</artifactId>

            <version>4.5</version>

        </dependency>

2、编写Java代码

//引入Java包

import org.apache.http.HttpResponse;

import org.apache.http.client.ClientProtocolException;

import org.apache.http.client.methods.HttpPost;

import org.apache.http.entity.mime.HttpMultipartMode;

import org.apache.http.entity.mime.MultipartEntity;

import org.apache.http.entity.mime.content.FileBody;

import org.apache.http.entity.mime.content.StringBody;

import org.apache.http.impl.client.DefaultHttpClient;

public static String FilePost(String url,File value) throws  Exception {

        String BOUNDARY = java.util.UUID.randomUUID().toString();

        MultipartEntity multipartEntity = new MultipartEntity(HttpMultipartMode.BROWSER_COMPATIBLE, "--------------------"+BOUNDARY, Charset.defaultCharset());

        //multipartEntity.addPart("key",new StringBody("123456",Charset.forName("UTF-8")));

        //multipartEntity.addPart("from",new StringBody("cw",Charset.forName("UTF-8")));

        multipartEntity.addPart("image_binary", new FileBody(value));

        //InputStream inputStream=new FileInputStream(value);;

        //inputStream=new ByteArrayInputStream("字符串转输入流".getBytes(Charset.forName("UTF-8")));

        //inputStream= IOUtil.newInputStream(ByteBuffer.wrap("字符串".getBytes()));

        //multipartEntity.addPart("image_binary",new InputStreamBody(inputStream,"1.jpg"));

        HttpPost request = new HttpPost(url);

        request.setEntity(multipartEntity);

        request.addHeader("Content-Type", "multipart/form-data; boundary=--------------------"+BOUNDARY);

        //request.addHeader("Content-Type","image/jpeg");  //视情况而定

        DefaultHttpClient httpClient = new DefaultHttpClient();

        HttpResponse response = httpClient.execute(request);

        InputStream is = response.getEntity().getContent();

        BufferedReader in = new BufferedReader(new InputStreamReader(is));

        StringBuffer buffer = new StringBuffer();

        String line = "";

        while ((line = in.readLine()) != null) {

            buffer.append(line);

        }

        System.out.println("发送消息收到的返回："+buffer.toString());

        return buffer.toString();

    }

    public static void main(String[] args) throws Exception {

        File file=new File("F:\\test\\test\\1.jpg");

        String Result=FilePost("http://www.baidu.com/ocr/v2/general_ex",file);

   }

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