httpclient文件上传
测试client
package com.tnb.user;
import java.io.File;
import java.io.IOException;
import org.apache.http.HttpEntity;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpPut;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.mime.MultipartEntityBuilder;
import org.apache.http.entity.mime.content.FileBody;
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.EntityUtils;
public class Test {
public static void main(String[] args) {
// TODO Auto-generated method stub
Test test = new Test();
test.upload1();
}
public void upload1() {
CloseableHttpClient httpclient = HttpClients.createDefault();
System.out.println("executing request start" );
try {
HttpPost httppost = new HttpPost("http://localhost:9501/users/change_avatar?token=1526369728694ed006c9e8277d4a3db1bd2271a9e1cab");
FileBody avatar = new FileBody(new File("C:\\Users\\qsf\\Pictures\\logo.png"));
StringBody token = new StringBody("1526369728694ed006c9e8277d4a3db1bd2271a9e1cab", ContentType.TEXT_PLAIN);
HttpEntity reqEntity = MultipartEntityBuilder.create().addPart("avatar", avatar).addPart("token", token).build();
httppost.setEntity(reqEntity);
System.out.println("executing request " + httppost.getRequestLine());
CloseableHttpResponse response = httpclient.execute(httppost);
try {
System.out.println("----------------------------------------");
System.out.println(response.getStatusLine());
HttpEntity resEntity = response.getEntity();
if (resEntity != null) {
System.out.println("Response content length: " + resEntity.getContentLength());
}
EntityUtils.consume(resEntity);
} finally {
response.close();
}
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
httpclient.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
public void upload() {
CloseableHttpClient httpclient = HttpClients.createDefault();
System.out.println("executing request start" );
try {
HttpPut httppost = new HttpPut("http://localhost:9501/users/update_avatar?token=1526369728694ed006c9e8277d4a3db1bd2271a9e1cab");
FileBody avatar = new FileBody(new File("C:\\Users\\qsf\\Pictures\\logo.png"));
StringBody token = new StringBody("1526369728694ed006c9e8277d4a3db1bd2271a9e1cab", ContentType.TEXT_PLAIN);
HttpEntity reqEntity = MultipartEntityBuilder.create().addPart("file", avatar).addPart("token", token).build();
httppost.setEntity(reqEntity);
System.out.println("executing request " + httppost.getRequestLine());
CloseableHttpResponse response = httpclient.execute(httppost);
try {
System.out.println("----------------------------------------");
System.out.println(response.getStatusLine());
HttpEntity resEntity = response.getEntity();
if (resEntity != null) {
System.out.println("Response content length: " + resEntity.getContentLength());
}
EntityUtils.consume(resEntity);
} finally {
response.close();
}
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
httpclient.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
pom修改，增加
spring boot application增加
@Bean(name = "multipartResolver")
public MultipartResolver multipartResolver(){
CommonsMultipartResolver resolver = new CommonsMultipartResolver();
resolver.setDefaultEncoding("UTF-8");
resolver.setResolveLazily(true);//resolveLazily属性启用是为了推迟文件解析，以在在UploadAction中捕获文件大小异常
resolver.setMaxInMemorySize(40960);
resolver.setMaxUploadSize(50*1024*1024);//上传文件大小 50M 50*1024*1024
return resolver;
}
服务端
@ResponseBody
@PutMapping("/update_avatar")
public String handleFileUpload(@RequestParam("file") MultipartFile file) {if (!file.isEmpty()) {
try {
/*
* 这段代码执行完毕之后，图片上传到了工程的跟路径； 大家自己扩散下思维，如果我们想把图片上传到
* d:/files大家是否能实现呢？ 等等;
* 这里只是简单一个例子,请自行参考，融入到实际中可能需要大家自己做一些思考，比如： 1、文件路径； 2、文件名；
* 3、文件格式; 4、文件大小的限制;
*/
BufferedOutputStream out = new BufferedOutputStream(
new FileOutputStream(new File(
file.getOriginalFilename())));
System.out.println(file.getName());
out.write(file.getBytes());
out.flush();
out.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
return "上传失败," + e.getMessage();
} catch (IOException e) {
e.printStackTrace();
return "上传失败," + e.getMessage();
}
return "上传成功";
} else {
return "上传失败，因为文件是空的.";
}
}
@ResponseBody
@PostMapping("/change_avatar1")
public Object changeAvatar1(HttpServletRequest request) {//@RequestParam(name = "token", required = true) String token,@RequestParam(name = "avatar") MultipartFile avatar
MultipartHttpServletRequest params=((MultipartHttpServletRequest) request);
List
.getFiles("avatar");
String name=params.getParameter("token");
System.out.println("name:"+name);
MultipartFile file = null;
BufferedOutputStream stream = null;
for (int i = 0; i < files.size(); ++i) {
file = files.get(i);
if (!file.isEmpty()) {
try {
byte[] bytes = file.getBytes();
stream = new BufferedOutputStream(new FileOutputStream(
new File(file.getOriginalFilename())));
stream.write(bytes);
stream.close();
} catch (Exception e) {
stream = null;
return "You failed to upload " + i + " => "
+ e.getMessage();
}
} else {
return "You failed to upload " + i
+ " because the file was empty.";
}
}
return "upload successful";
}
https://blog.csdn.net/ahuyangdong/article/details/54343608
应用场景：
java代码部分做文件资源同步。比如：应用系统将上传的文件备份或同步至文件服务器中。
代码位置
位于java client相关代码部分，将文件流通过httpClient工具发送网络请求到服务器上。
关键代码
将java.io.File对象添加到HttpEntity（org.apache.http.HttpEntity）对象中：
MultipartEntityBuilder mEntityBuilder = MultipartEntityBuilder.create();
mEntityBuilder.addBinaryBody("file", file);
httppost.setEntity(mEntityBuilder.build());- 1
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Client完整代码
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import org.apache.http.HttpEntity;
import org.apache.http.HttpStatus;
import org.apache.http.ParseException;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.utils.HttpClientUtils;
import org.apache.http.entity.mime.MultipartEntityBuilder;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
public class FileClient {
/**
* 将文件提交至文件服务器
* @param file 文件对象
* @return FileStatus 上传结果
*/
public static String postFile(File file) {
CloseableHttpClient httpclient = HttpClients.createDefault();
CloseableHttpResponse response = null;
String result = null;
try {
HttpPost httpPost = new HttpPost(ServerURL.URL_FILE_POST);
MultipartEntityBuilder mEntityBuilder = MultipartEntityBuilder.create();
mEntityBuilder.addBinaryBody("file", file);
httpPost.setEntity(mEntityBuilder.build());
response = httpclient.execute(httpPost);
int statusCode = response.getStatusLine().getStatusCode();
if (statusCode == HttpStatus.SC_OK) {
HttpEntity resEntity = response.getEntity();
result =EntityUtils.toString(resEntity);
// 消耗掉response
EntityUtils.consume(resEntity);
}
} catch (ParseException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
HttpClientUtils.closeQuietly(httpclient);
HttpClientUtils.closeQuietly(response);
}
return result;
}
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Server代码
/**
* 上传文件
* @param fileRequest
*/
@RequestMapping("/postFile")
public void postFile(HttpServletRequest request, HttpServletResponse response) {
String result = "error";
Map map = new HashMap();
// 创建一个通用的多部分解析器
CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver(request.getSession()
.getServletContext());
// 判断 request 是否有文件上传,即多部分请求
if (multipartResolver.isMultipart(request)) {
// 转换成多部分request
MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest) request;
// 取得request中的所有文件名
Iterator iter = multiRequest.getFileNames();
while (iter.hasNext()) {
// 取得上传文件
MultipartFile multipartFile = multiRequest.getFile(iter.next());
if (multipartFile != null) {
// 取得当前上传文件的文件名称
String fileName = multipartFile.getOriginalFilename();
if (fileName.trim() != null && fileName.trim().length() > 0) {
CommonsMultipartFile cf = (CommonsMultipartFile) multipartFile;
DiskFileItem fi = (DiskFileItem) cf.getFileItem();
File tempFile = fi.getStoreLocation();
// 拿到文件，存储
...
result = "success";
}
}
}
}
}
map.put("result", result);
this.renderJson(response, map);
}
问题1：
org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.ClassCastException: org.apache.catalina.connector.RequestFacade
程序刚一运行访问就抛出了上面的类型转换异常信息，根据提示信息，找到了导致该异常的代码行：
MultipartHttpServletRequest multipartRequest=(MultipartHttpServletRequest)request;
MultipartFile file=multipartRequest.getFile("upload");
这个问题花费了我很多时间和精力，查找了很多相关资料之后，发现我的配置文件里少了对multipart解析器的配置:
添加上之后，运行，访问，上面的异常终于没有再出现，但是新的问题又来了
问题2：
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'multipartResolver' defined in ServletContext resource [/WEB-INF/dispatcher-servlet.xml]: Instantiation of bean failed; nested exception is java.lang.NoClassDefFoundError: org/apache/commons/fileupload/FileItemFactory这次的问题很明确，缺少文件包，添加commons-fileupload-1.2.jar，问题解决，接着又出新问题
问题3：
org.springframework.web.util.NestedServletException: Handler processing failed; nested exception is java.lang.NoClassDefFoundError: org/apache/commons/io/output/DeferredFileOutputStream添加commons-io-1.3.1，问题解决，
至此，整个程序终于可以完整的运行，正常上传
springmvc 中将MultipartFile转为file，springboot 注入CommonsMultipartResolver
第一种方法： MultipartFile file = xxx; CommonsMultipartFile cf= (CommonsMultipartFile)file; DiskFileItem fi = (DiskFileItem)cf.getFileItem(); File f = fi.getStoreLocation(); 会在项目的根目录的临时文件夹下生成一个文件； 第二种方法： transferTo(File dest)； 会在项目中生成一个新文件； 第三种方法： File f = (File) xxx 强转即可。前提是要配置multipartResolver，要不然会报类型转换失败的异常。 <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> <property name="maxUploadSize" value="104857600"/> <property name="maxInMemorySize" value="4096"/> bean> 没试过； 第四种方法： Workbook wb = Workbook.getWorkbook(xxx .getInputStream()); 转换为输入流，直接读取； 第五种方法： byte[] buffer = myfile.getBytes(); 先转换为字节数组，没试过；
//显示声明CommonsMultipartResolver为mutipartResolver @Bean(name = "multipartResolver") public MultipartResolver multipartResolver(){ CommonsMultipartResolver resolver = new CommonsMultipartResolver(); resolver.setDefaultEncoding("UTF-8"); resolver.setResolveLazily(true);//resolveLazily属性启用是为了推迟文件解析，以在在UploadAction中捕获文件大小异常 resolver.setMaxInMemorySize(40960); resolver.setMaxUploadSize(50*1024*1024);//上传文件大小 50M 50*1024*1024 return resolver; }
记录下httpclient 发送请求 服务端用@RequestBody 自动接收参数 报415
注解是post方式，那么检查以下内容：
1. 你是否用了post请求
2. 请求是否发送了数据
3. 请求内容格式需要是 application/json 。jquery 设置 contentType，--这地方要注意，我就是application/text报错415
4. 客户端是否出现了服务器没有的字段，spring post 中，字段可少，不可多。