重写AbstractHttpMessageConverter实现Excel下载_excelmessageconverter-优快云博客

该文章介绍了一种方法，通过扩展Spring的AbstractHttpMessageConverter，将AjaxResponse的响应转换为Excel格式。具体实现包括重写支持的类检查及读写内部方法，使用ApachePOI库来创建和写入Excel工作簿。

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HttpMessageXlsConverter

@RequestBody 默认输出为JSON，通过重写AbstractHttpMessageConverter，实现对AjaxResponse输出为Excel格式。

@Service
public class HttpMessageXlsConverter extends AbstractHttpMessageConverter<AjaxResponse>  {
	private static final MediaType Excel_Type = MediaType.valueOf("application/vnd.ms-excel");
	HttpMessageXlsConverter(){
		super(Excel_Type);
	}
	@Override
	protected boolean supports(Class<?> clazz) {
		return (AjaxResponse.class == clazz);
	}
	//反序列化
	@Override
	protected AjaxResponse readInternal(Class<? extends AjaxResponse> clazz, HttpInputMessage inputMessage)
			throws IOException, HttpMessageNotReadableException {
		return null;
	}
	// for AjaxResponse to serialize
	@Override
	protected void writeInternal(AjaxResponse t, HttpOutputMessage outputMessage)
			throws IOException, HttpMessageNotWritableException {
		final Workbook workbook = new HSSFWorkbook();
		final Sheet sheet = workbook.createSheet();
		final Row row = sheet.createRow(0);
		row.createCell(0).setCellValue(t.getCode());
		row.createCell(1).setCellValue(t.getMessage());
		row.createCell(2).setCellValue(t.getData().toString());
		workbook.write(outputMessage.getBody());
	}
}

POM.xml引入Excel API

		<!-- https://mvnrepository.com/artifact/org.apache.poi/poi -->
		<dependency>
		    <groupId>org.apache.poi</groupId>
		    <artifactId>poi</artifactId>
		    <version>3.9</version>
		</dependency>