httpclient 上传附件实例

/**
* 上传附件
* @param host
* @param uri
* @param filePath 文件路径
* @param name 服务端定义的附件名
* @param param 请求带的参数
* @return
*/
public String upload(String host, String uri, String filePath,String name, Map<String, String> param) {
logger.info("*****************request*****************");
CloseableHttpClient httpClient = null;
CloseableHttpResponse response = null;
String url = host + uri ;
String rst = "";
try {
httpClient = HttpClients.createDefault();
logger.info("请求路径： "+ url);
HttpPost httpPost = new HttpPost(url);
//通过当前类的加载器来加载资源，调用getResourceAsStream()是保证和类类型同一个加载器加载
InputStream inputStream = this.getClass().getClassLoader().getResourceAsStream(filePath); //获取resources下的资源文件
File file = new File(filePath);
MultipartEntityBuilder builder = MultipartEntityBuilder.create(); //创建MultipartEntityBuilder对象
//添加上传的二进制文件
builder.addBinaryBody(name, inputStream, ContentType.create("multipart/form-data",Consts.UTF_8), file.getName());
for (Map.Entry<String, String> entry : param.entrySet()) {
String key = entry.getKey();
String value = entry.getValue();
StringBody stringBody = new StringBody(value, create("text/plain", Consts.UTF_8)); //解决中文乱码问题
//添加请求入参
builder.addPart(key, stringBody);
logger.info("请求参数："+key+":"+ value);
}
HttpEntity reqEntity = builder.build();
httpPost.setEntity(reqEntity);
// 发起请求 并返回请求的响应
response = httpClient.execute(httpPost);
// 获取响应对象
HttpEntity resEntity = response.getEntity();
if (resEntity != null) {
// 打印响应内容
rst = EntityUtils.toString(resEntity, Charset.forName("UTF-8")) ;
logger.info("*****************response*****************");
logger.info("响应结果： " +rst);
}
// 销毁
EntityUtils.consume(resEntity);
return rst;
} catch (Exception e) {
logger.info("出错啦： "+e.getMessage());
e.printStackTrace();
return "出错了";
} finally {
try {
if (response != null) {
response.close();
}
} catch (IOException e) {
e.printStackTrace();
}
try {
if (httpClient != null) {
httpClient.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}

/**
* @description: TODO 上传图片
* @author : xxx
* @date 2019/6/6 11:15
*/
public String uploadImage() throws Exception {
Map<String, String> params = new HashMap<>();
params.put("uploadType","1");
//文件放置resources目录下， 服务端定义接收附件名称为 imageFile
String rst = upload("http://xxxx.com","/web/upload","picture/repaymentPic.jpg","imageFile",params);
return rst;
}

1.设置上传的模式；
setMode(HttpMultipartMode mode)，其中mode主要有BROWSER_COMPATIBLE，RFC6532，STRICT三种，默认值是STRICT。
2.创建MultipartEntityBuilder对象，并添加需要上传的数据；
a.利用MultipartEntityBuilder.create()来创建对象；
b.addBinaryBody：以二进制的形式添加数据，可以添加File、InputStream、byte[]类型的数据。
addBinaryBody(String name, File file, ContentType contentType, String filename)
addBinaryBody(String name, InputStream stream, ContentType contentType, String filename)
addBinaryBody(String name, byte[] b, ContentType contentType, String filename)
c.addTextBody：添加文本数据
addTextBody(String name, String text, ContentType contentType)
d.addPart：以Key/Value的形式添加ContentBody类型的数据
addPart(String name, ContentBody contentBody)

MultipartEntityBuilder用法

2.MultipartEntityBuilder这个类主要用于创建HttpEntity。它的主要方法有：