前言
本文主要做基本的图片下载示例
实现
通过字节流返回
这种方案是最基本的方案，包括oss图片链接和所有直接通过url请求的图片都是这种方式实现的。该方案的图片在浏览器可以直接打开
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| package cn.idea360.demo.modules.login;
import cn.idea360.demo.common.utils.QrcodeUtil;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.OutputStream;
import java.util.Base64;
@RestController
@RequestMapping("/qr")
public class QrController {
@RequestMapping(value = "/img", produces = MediaType.IMAGE_JPEG_VALUE)
public void getImageByBytes(HttpServletResponse response) throws Exception{
File file = new File("C:\\Users\\Administrator\\Desktop\\1.jpg");
FileInputStream inputStream = new FileInputStream(file);
byte[] bytes = new byte[inputStream.available()];
inputStream.read(bytes, 0, inputStream.available());
response.setContentType("image/jpeg");
response.setCharacterEncoding("UTF-8");
response.setHeader("Accept-Ranges", "bytes");
OutputStream outputSream = response.getOutputStream();
outputSream.write(bytes);
outputSream.flush();
}
}
|
通过base64返回
该方案返回类型是base64编码的字符串, 放在h5的img标签中渲染。
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| package cn.idea360.demo.modules.login;
import cn.idea360.demo.common.utils.QrcodeUtil;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.OutputStream;
import java.util.Base64;
@RestController
@RequestMapping("/qr")
public class QrController {
@RequestMapping(value = "/base64img")
public String getImageByBase64() throws Exception {
File file = new File("C:\\Users\\Administrator\\Desktop\\1.jpg");
FileInputStream inputStream = new FileInputStream(file);
byte[] bytes = new byte[inputStream.available()];
inputStream.read(bytes, 0, inputStream.available());
return "data:image/jpg;base64," + Base64.getEncoder().encodeToString(bytes);
}
}
|
最后
本文到此结束，感谢阅读。如果您觉得不错，请关注公众号【当我遇上你】，您的支持是我写作的最大动力。
