地方门户网站系统,怎样做网站api接口,八亿免费建站,优化绿松石是什么意思现在有一个实体类对象的集合#xff0c;需要将它们转换为xml文档#xff0c;xml文档就是标签集合的嵌套#xff0c;例如一个学生类#xff0c;有姓名、年龄等#xff0c;需要转换成一下效果#xff1a; studentage14/agename张三/na…现在有一个实体类对象的集合需要将它们转换为xml文档xml文档就是标签集合的嵌套例如一个学生类有姓名、年龄等需要转换成一下效果 studentage14/agename张三/name/studentstudentage15/agename李四/name/studentstudentage16/agename王五/name/student首先定义student的实体类
import lombok.Data;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;Data
XmlRootElement
public class Student {private String name;private int age;// 无参构造函数必须有public Student() {}public Student(String name, int age) {this.name name;this.age age;}XmlElementpublic String getName() {return name;}public void setName(String name) {this.name name;}XmlElementpublic int getAge() {return age;}public void setAge(int age) {this.age age;}
}
因为是student的集合需要再构建一个StudentListWrapper类
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
import java.util.List;XmlRootElement
public class StudentListWrapper {private ListStudent students;public StudentListWrapper() {}public StudentListWrapper(ListStudent students) {this.students students;}XmlElement(name student)public ListStudent getStudents() {return students;}public void setStudents(ListStudent students) {this.students students;}
}两种下载方式无返回值的 GetMapping(testXmlDownload)public void testXmlDownload(HttpServletResponse response) throws Exception {try {// 创建一个包含 Student 对象的集合ListStudent studentList new ArrayList();studentList.add(new Student(张三, 14));studentList.add(new Student(李四, 15));studentList.add(new Student(王五, 16));// 创建 JAXB 上下文JAXBContext context JAXBContext.newInstance(StudentListWrapper.class);// 创建 MarshallerMarshaller marshaller context.createMarshaller();marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);// 将集合序列化为 XMLStringWriter writer new StringWriter();marshaller.marshal(new StudentListWrapper(studentList), writer);// 输出 XML 格式的文档String xmlDocument writer.toString();byte[] bytes xmlDocument.getBytes();// 使用 ByteArrayInputStream 将字节数组转换为 InputStreamInputStream inputStream new ByteArrayInputStream(bytes);// 使用 BufferedInputStream 包装 InputStreamBufferedInputStream bufferedInputStream new BufferedInputStream(inputStream);byte[] buffer new byte[bufferedInputStream.available()];bufferedInputStream.read(buffer);bufferedInputStream.close();response.reset();response.setCharacterEncoding(UTF-8);response.addHeader(Content-Disposition, attachment;filename URLEncoder.encode(student.concat(.xml), UTF-8));//response.addHeader(Content-Length, file.length());OutputStream outputStream new BufferedOutputStream(response.getOutputStream());response.setContentType(application/octet-stream);outputStream.write(buffer);outputStream.flush();// System.out.println(xmlDocument);} catch (Exception e) {e.printStackTrace();}}第二种使用 ResponseEntity 对象来封装响应内容和响应头并返回给客户端
GetMapping(/download)public ResponseEntitybyte[] downloadFile() throws Exception {// 创建一个包含 Student 对象的集合ListStudent studentList new ArrayList();studentList.add(new Student(张三, 14));studentList.add(new Student(李四, 15));studentList.add(new Student(王五, 16));// 创建 JAXB 上下文JAXBContext context JAXBContext.newInstance(StudentListWrapper.class);// 创建 MarshallerMarshaller marshaller context.createMarshaller();marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);// 将集合序列化为 XMLStringWriter writer new StringWriter();marshaller.marshal(new StudentListWrapper(studentList), writer);// 输出 XML 格式的文档String xmlContent writer.toString();// byte[] bytes xmlDocument.getBytes();// 将 XML 内容转换为字节数组byte[] xmlBytes xmlContent.getBytes(StandardCharsets.UTF_8);// 构造响应头HttpHeaders headers new HttpHeaders();headers.setContentType(MediaType.APPLICATION_XML);headers.setContentDispositionFormData(attachment, students.xml);// 构造 ResponseEntity 对象设置响应内容和响应头ResponseEntitybyte[] responseEntity new ResponseEntity(xmlBytes, headers, HttpStatus.OK);return responseEntity;}使用postman测试
复制到浏览器测试 打开效果
