Angular/SpringBootRestAPI下载Word文档-创新互联
POI生成Word文档
使用POI XWPF生成Word文档，引入POI:
org.apache.poi
poi-ooxml
4.1.0
项目中经常从Word模板生成文档，下面示例演示了替换文档内容的方法。模版中要替换的内容以${}标识，调用XWPFRun.setText()方法更新文档。
import org.apache.poi.xwpf.usermodel.XWPFDocument;
import org.apache.poi.xwpf.usermodel.XWPFParagraph;
import org.apache.poi.xwpf.usermodel.XWPFRun;
import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.List;
import java.util.Map;
public final class XWPFDocumentUtils {
private XWPFDocumentUtils() {
}
public static byte[] replaceDocument(String path, Map fields) throws IOException {
try (XWPFDocument doc = new XWPFDocument(new FileInputStream(path))) {
for (XWPFParagraph paragraph : doc.getParagraphs()) {
if (!paragraph.getText().contains("${")) {
continue;
}
replaceParagraph(paragraph, fields);
}
try (ByteArrayOutputStream out = new ByteArrayOutputStream()) {
doc.write(out);
return out.toByteArray();
}
}
}
private static void replaceParagraph(XWPFParagraph paragraph, Map fields) {
for (Map.Entry field : fields.entrySet()) {
String find = "${" + field.getKey() + "}";
if (!paragraph.getText().contains(find)) {
continue;
}
replaceText(paragraph, find, field.getValue());
}
}
private static void replaceText(XWPFParagraph paragraph, String key, String value) {
List runs = paragraph.getRuns();
for (int i = 0; i < runs.size(); i++) {
XWPFRun run = runs.get(i);
String text = run.text();
if (text.contains("${") || (text.contains("$") && runs.get(i + 1).text().startsWith("{"))) {
StringBuilder builder = new StringBuilder(text);
while (!text.contains("}")) {
text = runs.get(i + 1).text();
builder.append(text);
paragraph.removeRun(i + 1);
}
text = builder.toString();
run.setText(text.contains(key) ? text.replace(key, value) : text, 0);
}
}
}
} Spring Boot Rest API
Rest API
调用replaceDocument()方法生成word文档，如要在Rest API中定义文件名称，使用ResponseEntity并增加header，否则可以直接返回byte[]。
@GetMapping("/api/doc/{heroName}")
public ResponseEntity getDocument(@PathVariable String heroName) {
try {
Map fields = new HashMap<>();
fields.put("hero_name", heroName);
fields.put("create_date", "2019年6月");
byte[] bytes = XWPFDocumentUtil.replaceDocument("template/hero.docx", fields);
HttpHeaders headers = new HttpHeaders();
headers.add("Content-Disposition", "attachment;filename=hero.docx");
return ResponseEntity.ok().headers(headers).body(bytes);
} catch (Exception e) {
throw new XWPFDocumentException(e.getMessage());
}
} CORS
配置CORS的ExposedHeaders，否则前台不能读取"Content-Disposition"：
@Bean
CorsConfigurationSource corsConfigurationSource() {
CorsConfiguration configuration = new CorsConfiguration();
SecurityProperties.Cors cors = config.getCors();
configuration.setAllowedMethods(Arrays.asList("*"));
configuration.setAllowedHeaders(Arrays.asList("Accept","Accept-Encoding","Accept-Language","Authorization","Connection","Content-Type","Host","Origin","Referer","User-Agent","X-Requested-With"));
configuration.setExposedHeaders(Arrays.asList("Content-Disposition"));
UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
source.registerCorsConfiguration("/**", configuration);
return source;
}Test
测试使用exchange方法，设置header APPLICATION_OCTET_STREAM：
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.boot.test.web.client.TestRestTemplate;
import org.springframework.http.*;
import org.springframework.test.context.junit4.SpringRunner;
import java.util.Arrays;
import static org.assertj.core.api.Assertions.assertThat;
@RunWith(SpringRunner.class)
@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
public class HeroesApplicationTests {
@Autowired
private TestRestTemplate restTemplate;
@Test
public void getDocumentSuccess() {
HttpHeaders headers = new HttpHeaders();
headers.setAccept(Arrays.asList(MediaType.APPLICATION_OCTET_STREAM));
HttpEntity entity = new HttpEntity<>(headers);
ResponseEntity response = restTemplate.exchange("/api/doc/jason", HttpMethod.GET, entity, byte[].class);
assertThat(response.getStatusCode()).isEqualTo(HttpStatus.OK);
}
} Angular下载文档
可以使用链接直接访问REST URL下载文档，若项目启用了JWT Token验证，则必须使用HttpClient的get方法。
本文使用了FileSaver.js保存文档，开始之前先安装：
npm install --save file-saver然后在tsconfig.json中添加：
"paths": {
"file-saver": [
"node_modules/file-saver/dist/FileSaver.js"
]
}下载方法：
import * as fs from 'file-saver';
downloadDocument() {
this.httpClient.get('yourUrl', {observe: 'response', responseType: 'blob'}).subscribe(response => {
fs.saveAs(response.body, this.getFilename(response.headers));
});
}
private getFilename(headers: HttpHeaders): string {
const disposition = headers.get('Content-Disposition');
if (!disposition || disposition.indexOf('filename=') < 0) {
return '';
}
return disposition.substr(disposition.indexOf('filename=') + 9);
}或
downloadDocument() {
this.httpClient.get('yourUrl', {responseType: 'blob'}).subscribe(data => {
fs.saveAs(data, 'yourFilename');
});
}参考文档
Excel File – Download from SpringBoot RestAPI + Apache POI + MySQL
Apache POI Word Tutorial
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