BillHead billHead = new BillHead(); billHead.setCopListNo("12312524"); billHead.setCopNo("18"); try { XmlMapper xmlMapper = new XmlMapper(); xmlMapper.enable(SerializationFeature.INDENT_OUTPUT); String xml = xmlMapper.writeValueAsString(billHead); xml = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n" + xml; HttpHeaders headers = new HttpHeaders(); headers.setContentType(MediaType.APPLICATION_XML); return new ResponseEntity<>(xml, headers, HttpStatus.OK); } catch (JsonProcessingException e) { return new ResponseEntity<>(HttpStatus.INTERNAL_SERVER_ERROR); } 修改此代码return new ResponseEntity<>(xml, headers, HttpStatus.OK) 以Object接收

修改后的代码如下：

BillHead billHead = new BillHead();
billHead.setCopListNo("12312524");
billHead.setCopNo("18");
try {
    XmlMapper xmlMapper = new XmlMapper();
    xmlMapper.enable(SerializationFeature.INDENT_OUTPUT);
    String xml = xmlMapper.writeValueAsString(billHead);
    xml = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n" + xml;
    HttpHeaders headers = new HttpHeaders();
    headers.setContentType(MediaType.APPLICATION_XML);
    Object result = xml; // 将xml字符串赋值给Object类型变量result
    return new ResponseEntity<>(result, headers, HttpStatus.OK);
} catch (JsonProcessingException e) {
    return new ResponseEntity<>(HttpStatus.INTERNAL_SERVER_ERROR);
}

相关问题

BillHead billHead = new BillHead(); billHead.setCopListNo("12312524"); billHead.setCopNo("18"); try { XmlMapper xmlMapper = new XmlMapper(); xmlMapper.enable(SerializationFeature.INDENT_OUTPUT); String xml = xmlMapper.writeValueAsString(billHead); xml = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n" + xml; // Convert XML string to object BillHead parsedBillHead = xmlMapper.readValue(xml, BillHead.class); return parsedBillHead; } catch (JsonProcessingException e) { return null; } 根据以上代码创建相应的BillHead类

可以根据以下代码创建相应的BillHead类：

import com.fasterxml.jackson.dataformat.xml.annotation.JacksonXmlProperty;
import com.fasterxml.jackson.dataformat.xml.annotation.JacksonXmlRootElement;

@JacksonXmlRootElement(localName = "BillHead")
public class BillHead {
    @JacksonXmlProperty(localName = "copListNo")
    private String copListNo;
    @JacksonXmlProperty(localName = "copNo")
    private String copNo;

    public String getCopListNo() {
        return copListNo;
    }

    public void setCopListNo(String copListNo) {
        this.copListNo = copListNo;
    }

    public String getCopNo() {
        return copNo;
    }

    public void setCopNo(String copNo) {
        this.copNo = copNo;
    }
}

在这个类中，使用了`@JacksonXmlRootElement`注释来指定该类是一个XML根元素。使用`@JacksonXmlProperty`注释来指定XML元素的名称，以及将Java属性映射到这些XML元素。在getter和setter方法中，可以访问这些属性的值。

jsp mapper.xml mapper service serviceimpl controller util 生成二维码并保存到数据库

首先，你需要引入以下依赖：

<dependency>
    <groupId>com.google.zxing</groupId>
    <artifactId>core</artifactId>
    <version>3.3.0</version>
</dependency>
<dependency>
    <groupId>com.google.zxing</groupId>
    <artifactId>javase</artifactId>
    <version>3.3.0</version>
</dependency>

然后，在mapper.xml中定义一个插入二维码图片信息的SQL语句：

<insert id="insertQRCode" parameterType="string">
    insert into qrcode (content, image) values (#{content}, #{image})
</insert>

在mapper接口中定义该方法：

void insertQRCode(String content, byte[] image);

在mapper对应的service接口中定义该方法：

void generateAndSaveQRCode(String content);

在service实现类中实现该方法：

@Override
public void generateAndSaveQRCode(String content) {
    try {
        // 生成二维码
        BitMatrix bitMatrix = new QRCodeWriter().encode(content, BarcodeFormat.QR_CODE, 200, 200);
        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
        MatrixToImageWriter.writeToStream(bitMatrix, "png", byteArrayOutputStream);
        byte[] image = byteArrayOutputStream.toByteArray();
        // 保存到数据库
        mapper.insertQRCode(content, image);
    } catch (Exception e) {
        throw new RuntimeException("Failed to generate and save QR code.", e);
    }
}

最后，在controller中调用该方法即可：

@RestController
@RequestMapping("/qrcode")
public class QRCodeController {
    @Autowired
    private QRCodeService qrCodeService;

    @PostMapping
    public void generateAndSaveQRCode(@RequestParam String content) {
        qrCodeService.generateAndSaveQRCode(content);
    }
}

当你向 `/qrcode` 发送POST请求时，该接口将会生成并保存相应的二维码图片信息到数据库。