教你如何实现Java Http Post请求上传图片工具类

1. 流程表格

步骤 操作
1 创建HttpURLConnection对象
2 设置请求方法为POST
3 设置请求头信息
4 构建请求参数
5 获取输出流
6 上传图片数据
7 获取响应结果

2. 具体步骤及代码实现

步骤1：创建HttpURLConnection对象

// 创建URL对象
URL url = new URL("
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setDoOutput(true);
conn.setDoInput(true);
conn.setRequestMethod("POST");

步骤2：设置请求方法为POST

conn.setRequestMethod("POST");

步骤3：设置请求头信息

conn.setRequestProperty("Content-Type", "image/jpeg");

步骤4：构建请求参数

String boundary = "Boundary-" + System.currentTimeMillis();
conn.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + boundary);

// 设置参数
OutputStream os = conn.getOutputStream();
os.write(("--" + boundary + "\r\n").getBytes());
os.write(("Content-Disposition: form-data; name=\"file\"; filename=\"image.jpg\"\r\n").getBytes());
os.write(("Content-Type: image/jpeg\r\n\r\n").getBytes());
FileInputStream fis = new FileInputStream("path/to/image.jpg");
byte[] buffer = new byte[1024];
int bytesRead;
while ((bytesRead = fis.read(buffer)) != -1) {
    os.write(buffer, 0, bytesRead);
}
os.write(("\r\n--" + boundary + "--\r\n").getBytes());
os.flush();
os.close();
fis.close();

步骤5：获取输出流

OutputStream os = conn.getOutputStream();

步骤6：上传图片数据

FileInputStream fis = new FileInputStream("path/to/image.jpg");
byte[] buffer = new byte[1024];
int bytesRead;
while ((bytesRead = fis.read(buffer)) != -1) {
    os.write(buffer, 0, bytesRead);
}
fis.close();

步骤7：获取响应结果

InputStream is = conn.getInputStream();
BufferedReader br = new BufferedReader(new InputStreamReader(is));
String line;
StringBuilder response = new StringBuilder();
while ((line = br.readLine()) != null) {
    response.append(line);
}
System.out.println(response.toString());
br.close();

3. 类图

classDiagram
    class HttpURLConnection {
        +setRequestMethod(String method)
        +setRequestProperty(String key, String value)
        +getOutputStream()
        +getInputStream()
    }
    class FileInputStream {
        +FileInputStream(String filename)
        +read(byte[] buffer)
        +close()
    }

4. 关系图

erDiagram
    HTTPURLConnection ||--o{ FileInputStream : 使用
    HTTPURLConnection ||--o{ OutputStream : 使用

通过以上步骤和代码实现，你就可以完成Java Http Post请求上传图片的工具类。希望这篇文章可以帮助到你，祝你学习进步！