RestTemplate 提交Multipartfile数组参数_type definition error: [simple type, class org.spr

项目场景：

项目场景：客户要求物流运输的签收单文件回传到客户系统

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问题描述：

回传多文件是报错，调用不到客户系统

FileInputStream in = new FileInputStream("D:\\P210414170526708.jpg");
        FileInputStream in2 = new FileInputStream("D:\\ccc.jpg");
        MultiValueMap<String, Object> postParameters = new LinkedMultiValueMap<>();
        postParameters.add("wayBillNo","T10000");
        List<MultipartFileResource> fileList = new ArrayList<>();
        fileList.add(new MultipartFileResource(in, "aaaaaaa.jpg"));
        String url = "http://localhost:8089/file/upload2";
        Map<String, Object> post = HttpRequestUtils.post(url, postParameters, new HashMap<>(), MediaType.MULTIPART_FORM_DATA);
        System.out.println(post);
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# 报错：

org.springframework.http.converter.HttpMessageConversionException: Type definition error: [simple type, class java.io.FileDescriptor]; nested exception is com.fasterxml.jackson.databind.exc.InvalidDefinitionException: No serializer found for class java.io.FileDescriptor and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) (through reference chain: java.util.ArrayList[0]->com.henglu.common.entity.MultipartFileResource[“inputStream”]->java.io.FileInputStream[“fd”])
at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.writeInternal(AbstractJackson2HttpMessageConverter.java:293)
at org.springframework.http.converter.AbstractGenericHttpMessageConverter.writeInternal(AbstractGenericHttpMessageConverter.java:111)
at org.springframework.http.converter.AbstractHttpMessageConverter.write(AbstractHttpMessageConverter.java:224)
at org.springframework.http.converter.FormHttpMessageConverter.writePart(FormHttpMessageConverter.java:400)
at org.springframework.http.converter.FormHttpMessageConverter.writeParts(FormHttpMessageConverter.java:376)
at org.springframework.http.converter.FormHttpMessageConverter.writeMultipart(FormHttpMessageConverter.java:356)
at org.springframework.http.converter.FormHttpMessageConverter.write(FormHttpMessageConverter.java:274)
at org.springframework.http.converter.FormHttpMessageConverter.write(FormHttpMessageConverter.java:95)
at org.springframework.web.client.RestTemplate$HttpEntityRequestCallback.doWithRequest(RestTemplate.java:955)
at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:721)
at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:680)
at org.springframework.web.client.RestTemplate.postForObject(RestTemplate.java:435)
at com.henglu.common.utils.HttpRequestUtils.post(HttpRequestUtils.java:89)
at dahua.DahuaTest.test5(DahuaTest.java:173)
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.springframework.test.context.junit4.statements.RunBeforeTestExecutionCallbacks.evaluate(RunBeforeTestExecutionCallbacks.java:73)
at org.springframework.test.context.junit4.statements.RunAfterTestExecutionCallbacks.evaluate(RunAfterTestExecutionCallbacks.java:83)
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:251)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:97)
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$2.evaluate(ParentRunner.java:268)atorg.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)atorg.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)atorg.junit.runners.ParentRunner.run(ParentRunner.java:363)atorg.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:190)atorg.junit.runner.JUnitCore.run(JUnitCore.java:137)atcom.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)atcom.intellij.rt.execution.junit.IdeaTestRunner$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)

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# 原因分析：

分析了一下，是参数封装错了，数组参数提交的时候应该是把相同的key名称加入MultiValueMap中，这样就是提交了数组数据了

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解决方案：

• RestTemplate 请求封装

import org.apache.commons.collections.MapUtils;
import org.apache.http.HttpEntity;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.web.client.RestTemplate;

import java.io.IOException;
import java.net.URISyntaxException;
import java.util.Map;

public final class HttpRequestUtils {
   //设置字符编码
   private static final String CHARSET = "UTF-8";

   private static RequestConfig defaultRequestConfig = RequestConfig
       .custom()
       //设置等待数据超时时间
       .setSocketTimeout(30000)
       //设置连接超时时间
       .setConnectTimeout(30000)
       //设置从连接池获取连接的等待超时时间
       .setConnectionRequestTimeout(30000)
       //.setStaleConnectionCheckEnabled(true)
       .build();

   //释放资源，httpResponse为响应流，httpClient为请求客户端
   private static void release(CloseableHttpResponse httpResponse, CloseableHttpClient httpClient) throws IOException {
       if (httpResponse != null) {
           httpResponse.close();
       }
       if (httpClient != null) {
           httpClient.close();
       }
   }

   //get请求带参数、带请求头
   public static String get(String urlWithParams, Map<String, String> header) throws IOException {
       CloseableHttpClient httpClient = HttpClients.createDefault();
       HttpGet httpget = new HttpGet(urlWithParams);
       if (!MapUtils.isEmpty(header)) {
           header.forEach(httpget::addHeader);
       }
       CloseableHttpResponse response = httpClient.execute(httpget);
       HttpEntity entity = response.getEntity();
       String result = EntityUtils.toString(entity, CHARSET);
       httpget.releaseConnection();
       release(response, httpClient);
       return result;
   }

   public static String get(String urlWithParams) throws IOException {
       return get(urlWithParams, null);
   }

   //发送post请求，带json请求体和请求头
   public static String postJson(String url, String json, Map<String, String> headersMap) {
       RestTemplate restTemplate = new RestTemplate();
       HttpHeaders headers = new HttpHeaders();
       headers.setContentType(MediaType.APPLICATION_JSON_UTF8);

       for (Map.Entry<String, String> entry : headersMap.entrySet()) {
           headers.add(entry.getKey(),entry.getValue());
       }
       org.springframework.http.HttpEntity<String> request = new org.springframework.http.HttpEntity<>(json, headers);
       ResponseEntity<String> response = restTemplate.postForEntity(url, request, String.class);
       return response.getBody();
   }
   //发送post请求，请求体和请求头
   public  static <T> Map<String, Object> post(String url, T paraT, Map<String, String> headersMap, MediaType mediaType) throws URISyntaxException {
       RestTemplate restTemplate = new RestTemplate();
       HttpHeaders headers = new HttpHeaders();
       if(mediaType != null) {
           headers.setContentType(mediaType);
       }

       for (Map.Entry<String, String> entry : headersMap.entrySet()) {
           headers.add(entry.getKey(),entry.getValue());
       }
       org.springframework.http.HttpEntity<T> request = new org.springframework.http.HttpEntity<>(paraT, headers);
       Map response = restTemplate.postForObject(url, request, Map.class);
       return response;
   }

}
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• 调用客户接口

 FileInputStream in = new FileInputStream("D:\\P210414170526708.jpg");
        FileInputStream in2 = new FileInputStream("D:\\cccc.jpg");
        MultiValueMap<String, Object> postParameters = new LinkedMultiValueMap<>();
        postParameters.add("wayBillNo","T10000");
        postParameters.add("fileList", new MultipartFileResource(in, "P210414170526708.jpg"));
        postParameters.add("fileList", new MultipartFileResource(in2, "ccc.jpg"));
        String url = "http://localhost:8089/file/upload2";
        Map<String, Object> post = HttpRequestUtils.post(url, postParameters, new HashMap<>(), MediaType.MULTIPART_FORM_DATA);
        System.out.println(post);
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