调接口传文件的示例

package com.utils.file;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.StatusLine;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.mime.HttpMultipartMode;
import org.apache.http.entity.mime.MultipartEntityBuilder;
import org.apache.http.entity.mime.content.StringBody;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.CharsetUtils;
import net.sf.json.JSONObject;

public class Main {

public static void main(String[] args) throws Exception {

JSONObject json = new JSONObject();
File file=new File("C:\Users\Desktop\jj.jpg");
if(file.length()==0){
json.put("400", "根据地址找不到指定的文件。");
}
String applyno = "002000012205457";
String fileName =file.getName();
String token = "6c445d95618c95375b88c40ccab4cc4e";
MultipartEntityBuilder multipartEntityBuilder = MultipartEntityBuilder.create();
multipartEntityBuilder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);
multipartEntityBuilder.setCharset(CharsetUtils.get("UTF-8"));
multipartEntityBuilder.addPart("accessToken",
new StringBody(token, ContentType.create(ContentType.TEXT_PLAIN.getMimeType(), "UTF-8")));
multipartEntityBuilder.addPart("applyNo",
new StringBody(applyno, ContentType.create(ContentType.TEXT_PLAIN.getMimeType(),"UTF-8")));
multipartEntityBuilder.addPart("documentType",
new StringBody("1", ContentType.create(ContentType.TEXT_PLAIN.getMimeType(),"UTF-8")));
byte[] bytes = File2byte(file);
InputStream is = new ByteArrayInputStream(bytes);
multipartEntityBuilder.addBinaryBody("file", is, ContentType.MULTIPART_FORM_DATA,
fileName);
String reult = apiResFile("/uapply/uploadDocument", multipartEntityBuilder);
JSONObject reultobj = JSONObject.fromObject(reult);
System.out.println(reultobj);
}

/**
* 将文件转换成byte数组
* @param filePath
* @return
*/
public static byte[] File2byte(File tradeFile){
byte[] buffer = null;
try
{
FileInputStream fis = new FileInputStream(tradeFile);
ByteArrayOutputStream bos = new ByteArrayOutputStream();
byte[] b = new byte[10240];
int n;
while ((n = fis.read(b)) != -1)
{
bos.write(b, 0, n);
}
fis.close();
bos.close();
buffer = bos.toByteArray();
}catch (FileNotFoundException e){
e.printStackTrace();
}catch (IOException e){
e.printStackTrace();
}
return buffer;
}

/**
* 上传附件
* @param url
* @param multipartEntityBuilder
* @return
* @throws Exception
*/
public static String apiResFile(String url, MultipartEntityBuilder multipartEntityBuilder) throws Exception {
url = "http://............api" + url; //测试
CloseableHttpClient httpClient = HttpClients.createDefault();
HttpPost httpPost = new HttpPost(url);
org.apache.http.HttpEntity reqEntity = multipartEntityBuilder.build();
httpPost.setEntity(reqEntity);
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
InputStream is2 = httpEntity.getContent();
byte[] bytes = toByteArray(is2);
String responseString = new String(bytes, "UTF-8");
StatusLine statusLine = httpResponse.getStatusLine();
if (statusLine.getStatusCode() >= 400) {
return "post failure :caused by-->" + responseString;
} else {
return responseString;
}
}

public static byte[] toByteArray(InputStream is) {
if (is == null) {
return null;
} else {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
byte[] buffer = new byte[2048];

try {
int bytesRead;
while((bytesRead = is.read(buffer, 0, 1024)) != -1) {
baos.write(buffer, 0, bytesRead);
}
} catch (IOException var5) {
}
return baos.toByteArray();
}
}

}