当前，我需要为另一个发送xls格式响应的Java应用程序提供一个API，而当我在本地进行测试时，请使用MockMVC从我的API获取响应并使用HSSFWorkBook对其进行解析，但是在失败时，任何人都可以帮助我展示如何在Java中实现此API？ 非常感谢！！！
框架：SpringMVC
我的代码：
@RequestMapping(value = "/report", method = RequestMethod.GET)
public ResponseEntity getReport() {
LOGGER.info("begin to get report");
// Workbook dailyReport = reportService.getDailyReport();
Workbook dailyReport = new HSSFWorkbook();
OutputStream outByteStream = new ByteArrayOutputStream();
try {
dailyReport.write(outByteStream);
LOGGER.info("end to get report");
} catch (IOException e) {
LOGGER.error("IOException when write excel to stream, e: {}", e);
}
MultiValueMap<String, String> headers = new HttpHeaders();
List<String> list = new ArrayList<>();
list.add("application/vnd.ms-excel");
headers.put(HttpHeaders.CONTENT_TYPE, list);
return new ResponseEntity(outByteStream, headers, HttpStatus.OK);
}
测试方法：
@Test
public void testGetMigrationDailyReport() {
String url = "/report";
try {
MvcResult mvcResult = this.mockMvc.perform(MockMvcRequestBuilders.get(url)).andExpect(status().isOk()).andReturn();
String response = mvcResult.getResponse().getContentAsString();
byte[] bytes = response.getBytes();
InputStream inputStream = new ByteArrayInputStream(bytes);
Workbook workbook = new HSSFWorkbook(inputStream);
Sheet sheet = workbook.getSheetAt(0);
} catch (Exception e) {
e.printStackTrace();
}
}
完整的堆栈跟踪：
org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.IllegalArgumentException: No converter found for return value of type: class java.io.ByteArrayOutputStream
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:979)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:858)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:687)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:843)
at org.springframework.test.web.servlet.TestDispatcherServlet.service(TestDispatcherServlet.java:65)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at org.springframework.mock.web.MockFilterChain$ServletFilterProxy.doFilter(MockFilterChain.java:167)
at org.springframework.mock.web.MockFilterChain.doFilter(MockFilterChain.java:134)
at org.springframework.test.web.servlet.MockMvc.perform(MockMvc.java:155)
at com.cisco.csit.wbxmig.web.IntegrationControllerTest.testGetMigrationDailyReport(IntegrationControllerTest.java:59)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75)
at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86)
at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:254)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:89)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:193)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
Caused by: java.lang.IllegalArgumentException: No converter found for return value of type: class java.io.ByteArrayOutputStream
at org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:179)
at org.springframework.web.servlet.mvc.method.annotation.HttpEntityMethodProcessor.handleReturnValue(HttpEntityMethodProcessor.java:183)
at org.springframework.web.method.support.HandlerMethodReturnValueHandlerComposite.handleReturnValue(HandlerMethodReturnValueHandlerComposite.java:81)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:126)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:832)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:743)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:961)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:895)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:967)
... 38 more
答案 0 :(得分：2)
我尝试了以下方法：
效果很好。区别在于我在做ByteArrayOutputStream.getBytes()。
@GetMapping("/down")
public ResponseEntity<byte[]> down() throws IOException {
ByteArrayOutputStream outByteStream = new ByteArrayOutputStream();
Workbook wb = new HSSFWorkbook();
for(int sNo=1;sNo<=5;sNo++) {
Sheet sheet = wb.createSheet("s"+sNo);
for(int i=1;i<6;i++) {
Row row = sheet.createRow(i);
for(int j=1;j<=5;j++) {
Cell cell = row.createCell(j);
cell.setCellValue("test "+j);
}
}
}
wb.write(outByteStream);
wb.close();
MultiValueMap<String, String> headers = new HttpHeaders();
List<String> list = new ArrayList<>();
list.add("application/vnd.ms-excel");
headers.put(HttpHeaders.CONTENT_TYPE, list);
return new ResponseEntity<byte[]>(outByteStream.toByteArray(),headers, HttpStatus.OK);
}
添加test。
诀窍是根据响应创建文件，然后再次读取 根据响应创建文件
FileOutputStream fos = new FileOutputStream("/Users/me/Desktop/output.xlsx");
fos.write(bytes);
fos.close();
读取文件
FileInputStream fis = new FileInputStream("/Users/me/Desktop/output.xlsx");
Workbook wb = WorkbookFactory.create(fis);
整个测试班
import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.usermodel.WorkbookFactory;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.autoconfigure.web.servlet.WebMvcTest;
import org.springframework.security.test.web.servlet.setup.SecurityMockMvcConfigurers;
import org.springframework.security.web.FilterChainProxy;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringRunner;
import org.springframework.test.context.web.WebAppConfiguration;
import org.springframework.test.web.servlet.MockMvc;
import org.springframework.test.web.servlet.MvcResult;
import org.springframework.test.web.servlet.request.MockMvcRequestBuilders;
import org.springframework.test.web.servlet.result.MockMvcResultMatchers;
import org.springframework.test.web.servlet.setup.MockMvcBuilders;
import org.springframework.web.context.WebApplicationContext;
import com.techdisqus.App;
import com.techdisqus.config.SpringSecurityConfig;
import com.techdisqus.controller.DefaultController;
@RunWith(SpringRunner.class)
/*@SpringBootTest
@ContextConfiguration*/
@WebMvcTest(DefaultController.class)
@ContextConfiguration(classes= {App.class,SpringSecurityConfig.class
})
@WebAppConfiguration
public class MvcTest {
@Autowired
private MockMvc mockMvc;
@Autowired
private FilterChainProxy springSecurityFilterChain;
@Autowired
private WebApplicationContext wac;
@Before
public void setup() {
this.mockMvc = MockMvcBuilders.webAppContextSetup(this.wac)
.addFilters(this.springSecurityFilterChain).apply(SecurityMockMvcConfigurers.springSecurity()).build();
}
@Test
public void testDown() {
String url = "/down";
try {
MvcResult mvcResult = this.mockMvc.perform(MockMvcRequestBuilders.get(url)).andExpect(MockMvcResultMatchers.status().isOk()).andReturn();
byte[] bytes = mvcResult.getResponse().getContentAsByteArray();
FileOutputStream fos = new FileOutputStream("/Users/me/Desktop/output.xlsx");
fos.write(bytes);
fos.close();
FileInputStream fis = new FileInputStream("/Users/me/Desktop/output.xlsx");
Workbook wb = WorkbookFactory.create(fis);
int count = wb.getNumberOfSheets();
System.out.println("count "+count);
for(int i=0;i<count;i++) {
System.out.println(wb.getSheetAt(i).getSheetName());
//perform asserts here if needed
}
System.out.println("done!");
} catch (Exception e) {
e.printStackTrace();
}
}
}